moonbridge: moonbridge.c annotate

moonbridge

annotate moonbridge.c @ 212:453b7d1a7944

Avoid use of accept4() function in favor of accept() to avoid using _GNU_SOURCE on GNU/Linux

author	jbe
date	Mon Jun 22 22:19:41 2015 +0200 (2015-06-22)
parents	a3d569d3e85d
children	43a077f2ab49

rev	line source
jbe@58	1
jbe@58	2 /* Version */
jbe@58	3 #define MOONBR_VERSION_STRING "0.4.0"
jbe@58	4
jbe@0	5
jbe@0	6 /* Compile-time configuration */
jbe@0	7
jbe@0	8 #define MOONBR_LUA_PANIC_BUG_WORKAROUND 1
jbe@0	9
jbe@0	10
jbe@0	11 /* C preprocessor macros for portability support */
jbe@0	12
jbe@0	13 #ifndef __has_include
jbe@0	14 #define __has_include(x) 0
jbe@0	15 #endif
jbe@0	16
jbe@0	17
jbe@0	18 /* Include directives for used system libraries */
jbe@0	19
jbe@0	20 #include <stdlib.h>
jbe@0	21 #include <stdint.h>
jbe@135	22 #include <string.h>
jbe@0	23 #include <errno.h>
jbe@135	24 #include <unistd.h>
jbe@135	25 #include <signal.h>
jbe@135	26 #include <sys/wait.h>
jbe@135	27 #include <sys/resource.h>
jbe@135	28 #include <poll.h>
jbe@136	29 #include <time.h>
jbe@0	30 #include <sys/time.h>
jbe@0	31 #include <sys/socket.h>
jbe@0	32 #include <sys/un.h>
jbe@0	33 #include <netinet/in.h>
jbe@125	34 #include <netdb.h>
jbe@125	35 #include <arpa/inet.h>
jbe@135	36 #include <getopt.h>
jbe@0	37 #include <sys/file.h>
jbe@135	38 #include <syslog.h>
jbe@0	39 #if defined(__FreeBSD__) \|\| __has_include(<libutil.h>)
jbe@0	40 #include <libutil.h>
jbe@0	41 #endif
jbe@0	42 #if defined(__linux__) \|\| __has_include(<bsd/libutil.h>)
jbe@0	43 #include <bsd/libutil.h>
jbe@0	44 #endif
jbe@0	45 #if defined(__linux__) \|\| __has_include(<bsd/unistd.h>)
jbe@0	46 #include <bsd/unistd.h>
jbe@0	47 #endif
jbe@0	48
jbe@0	49
jbe@0	50 /* Fallback definitions for missing constants on some platforms */
jbe@0	51
jbe@0	52 /* INFTIM is used as timeout parameter for poll() */
jbe@0	53 #ifndef INFTIM
jbe@0	54 #define INFTIM -1
jbe@0	55 #endif
jbe@0	56
jbe@0	57
jbe@0	58 /* Include directives for Lua */
jbe@0	59
jbe@0	60 #include <lua.h>
jbe@0	61 #include <lauxlib.h>
jbe@0	62 #include <lualib.h>
jbe@0	63
jbe@0	64
jbe@79	65 /* Include directive for moonbridge_io library */
jbe@79	66
jbe@79	67 #include "moonbridge_io.h"
jbe@79	68
jbe@79	69
jbe@0	70 /* Constants */
jbe@0	71
jbe@0	72 /* Backlog option for listen() call */
jbe@0	73 #define MOONBR_LISTEN_BACKLOG 1024
jbe@0	74
jbe@0	75 /* Maximum length of a timestamp used for strftime() */
jbe@0	76 #define MOONBR_LOG_MAXTIMELEN 40
jbe@0	77
jbe@0	78 /* Maximum length of a log message */
jbe@0	79 #define MOONBR_LOG_MAXMSGLEN 4095
jbe@0	80
jbe@0	81 /* Exitcodes passed to exit() call */
jbe@0	82 #define MOONBR_EXITCODE_GRACEFUL 0
jbe@0	83 #define MOONBR_EXITCODE_CMDLINEERROR 1
jbe@0	84 #define MOONBR_EXITCODE_ALREADYRUNNING 2
jbe@0	85 #define MOONBR_EXITCODE_STARTUPERROR 3
jbe@0	86 #define MOONBR_EXITCODE_RUNTIMEERROR 4
jbe@0	87
jbe@0	88 /* Maximum length of a line sent to stderr by child processes */
jbe@0	89 #define MOONBR_MAXERRORLINELEN 1024
jbe@0	90
jbe@0	91 /* Maximum length of an error string returned by strerror() */
jbe@0	92 #define MOONBR_MAXSTRERRORLEN 80
jbe@0	93
jbe@0	94 /* Status bytes exchanged between master and child processes */
jbe@124	95 #define MOONBR_STATUS_IDLE 'I'
jbe@124	96 #define MOONBR_COMMAND_CONNECT 'C'
jbe@124	97 #define MOONBR_COMMAND_TERMINATE 'T'
jbe@124	98 #define MOONBR_STATUS_GOODBYE 'B'
jbe@0	99
jbe@0	100 /* Constant file descriptors */
jbe@0	101 #define MOONBR_FD_STDERR 2
jbe@0	102 #define MOONBR_FD_CONTROL 3
jbe@0	103 #define MOONBR_FD_END 4
jbe@0	104
jbe@0	105 /* Return values of moonbr_try_destroy_worker() */
jbe@0	106 #define MOONBR_DESTROY_NONE 0
jbe@0	107 #define MOONBR_DESTROY_PREPARE 1
jbe@0	108 #define MOONBR_DESTROY_IDLE_OR_ASSIGNED 2
jbe@0	109
jbe@0	110
jbe@0	111 /* Types */
jbe@0	112
jbe@0	113 /* Enum for 'moonbr_pstate' */
jbe@0	114 #define MOONBR_PSTATE_STARTUP 0
jbe@0	115 #define MOONBR_PSTATE_RUNNING 1
jbe@0	116 #define MOONBR_PSTATE_FORKED 2
jbe@0	117
jbe@0	118 /* Enum for 'proto' field of struct moonbr_listener */
jbe@127	119 #define MOONBR_PROTO_MAIN 1
jbe@127	120 #define MOONBR_PROTO_INTERVAL 2
jbe@127	121 #define MOONBR_PROTO_LOCAL 3
jbe@127	122 #define MOONBR_PROTO_TCP 4
jbe@0	123
jbe@0	124 /* Data structure for a pool's listener that can accept incoming connections */
jbe@0	125 struct moonbr_listener {
jbe@0	126 struct moonbr_pool *pool;
jbe@0	127 struct moonbr_listener prev_listener; / previous idle or(!) connected listener */
jbe@0	128 struct moonbr_listener next_listener; / next idle or(!) connected listener */
jbe@0	129 int proto;
jbe@0	130 union {
jbe@0	131 struct {
jbe@0	132 char name; / name of interval passed to 'connect' function as 'interval' field in table */
jbe@0	133 int strict; /* nonzero = runtime of 'connect' function does not delay interval */
jbe@0	134 struct timeval delay; /* interval between invocations of 'connect' function */
jbe@0	135 struct timeval wakeup; /* point in time of next invocation */
jbe@0	136 } interval;
jbe@0	137 struct {
jbe@125	138 union {
jbe@125	139 struct sockaddr addr_abstract;
jbe@125	140 struct sockaddr_un addr_un;
jbe@125	141 struct sockaddr_in addr_in;
jbe@125	142 struct sockaddr_in6 addr_in6;
jbe@125	143 } addr;
jbe@125	144 socklen_t addrlen;
jbe@125	145 } socket;
jbe@125	146 } type_specific;
jbe@125	147 union {
jbe@0	148 struct {
jbe@125	149 char ip[INET6_ADDRSTRLEN]; /* IP to listen on */
jbe@0	150 int port; /* port number to listen on (in host endianess) */
jbe@0	151 } tcp;
jbe@0	152 } proto_specific;
jbe@0	153 int listenfd; /* -1 = none */
jbe@0	154 int pollidx; /* -1 = none */
jbe@0	155 };
jbe@0	156
jbe@0	157 /* Data structure for a child process that is handling incoming connections */
jbe@0	158 struct moonbr_worker {
jbe@0	159 struct moonbr_pool *pool;
jbe@0	160 struct moonbr_worker *prev_worker;
jbe@0	161 struct moonbr_worker *next_worker;
jbe@0	162 struct moonbr_worker *prev_idle_worker;
jbe@0	163 struct moonbr_worker *next_idle_worker;
jbe@127	164 int main; /* nonzero = terminate Moonbridge when this worker dies */
jbe@0	165 int idle; /* nonzero = waiting for command from parent process */
jbe@0	166 int assigned; /* nonzero = currently handling a connection */
jbe@0	167 pid_t pid;
jbe@0	168 int controlfd; /* socket to send/receive control message to/from child process */
jbe@0	169 int errorfd; /* socket to receive error output from child process' stderr */
jbe@0	170 char errorlinebuf; / optional buffer for collecting stderr data from child process */
jbe@0	171 int errorlinelen; /* number of bytes stored in 'errorlinebuf' */
jbe@0	172 int errorlineovf; /* nonzero = line length overflow */
jbe@0	173 struct timeval idle_expiration; /* point in time until child process may stay in idle state */
jbe@0	174 struct moonbr_listener restart_interval_listener; / set while interval listener is assigned */
jbe@0	175 };
jbe@0	176
jbe@0	177 /* Data structure for a pool of workers and listeners */
jbe@0	178 struct moonbr_pool {
jbe@0	179 int poolnum; /* number of pool for log output */
jbe@0	180 struct moonbr_pool next_pool; / next entry in linked list starting with 'moonbr_first_pool' */
jbe@0	181 struct moonbr_worker first_worker; / first worker of pool */
jbe@0	182 struct moonbr_worker last_worker; / last worker of pool */
jbe@0	183 struct moonbr_worker first_idle_worker; / first idle worker of pool */
jbe@0	184 struct moonbr_worker last_idle_worker; / last idle worker of pool */
jbe@0	185 int idle_worker_count;
jbe@0	186 int unassigned_worker_count;
jbe@0	187 int total_worker_count;
jbe@0	188 int worker_count_stat; /* only needed for statistics */
jbe@0	189 int pre_fork; /* desired minimum number of unassigned workers */
jbe@0	190 int min_fork; /* desired minimum number of workers in total */
jbe@0	191 int max_fork; /* maximum number of workers */
jbe@0	192 struct timeval fork_delay; /* delay after each fork() until a fork may happen again */
jbe@0	193 struct timeval fork_wakeup; /* point in time when a fork may happen again (unless a worker terminates before) */
jbe@0	194 struct timeval fork_error_delay; /* delay between fork()s when an error during fork or preparation occurred */
jbe@0	195 struct timeval fork_error_wakeup; /* point in time when fork may happen again if an error in preparation occurred */
jbe@0	196 int use_fork_error_wakeup; /* nonzero = error in preparation occured; gets reset on next fork */
jbe@0	197 struct timeval exit_delay; /* delay for terminating excessive workers (unassigned_worker_count > pre_fork) */
jbe@0	198 struct timeval exit_wakeup; /* point in time when terminating an excessive worker */
jbe@0	199 struct timeval idle_timeout; /* delay before an idle worker is terminated */
jbe@0	200 size_t memory_limit; /* maximum bytes of memory that the Lua machine may allocate */
jbe@0	201 int listener_count; /* total number of listeners of pool (and size of 'listener' array at end of this struct) */
jbe@0	202 struct moonbr_listener first_idle_listener; / first listener that is idle (i.e. has no waiting connection) */
jbe@0	203 struct moonbr_listener last_idle_listener; / last listener that is idle (i.e. has no waiting connection) */
jbe@0	204 struct moonbr_listener first_connected_listener; / first listener that has a pending connection */
jbe@0	205 struct moonbr_listener last_connected_listener; / last listener that has a pending connection */
jbe@0	206 struct moonbr_listener listener[1]; /* static array of variable(!) size to contain 'listener' structures */
jbe@0	207 };
jbe@0	208
jbe@0	209 /* Enum for 'channel' field of struct moonbr_poll_worker */
jbe@0	210 #define MOONBR_POLL_WORKER_CONTROLCHANNEL 1
jbe@0	211 #define MOONBR_POLL_WORKER_ERRORCHANNEL 2
jbe@0	212
jbe@0	213 /* Structure to refer from 'moonbr_poll_worker_fds' entry to worker structure */
jbe@0	214 struct moonbr_poll_worker {
jbe@0	215 struct moonbr_worker *worker;
jbe@0	216 int channel; /* field indicating whether file descriptor is 'controlfd' or 'errorfd' */
jbe@0	217 };
jbe@0	218
jbe@0	219 /* Variable indicating that clean shutdown was requested */
jbe@0	220 static int moonbr_shutdown_in_progress = 0;
jbe@0	221
jbe@0	222
jbe@0	223 /* Macros for Lua registry */
jbe@0	224
jbe@0	225 /* Lightuserdata keys for Lua registry to store 'prepare', 'connect', and 'finish' functions */
jbe@0	226 #define moonbr_luakey_prepare_func(pool) ((void *)(intptr_t)(pool) + 0)
jbe@0	227 #define moonbr_luakey_connect_func(pool) ((void *)(intptr_t)(pool) + 1)
jbe@0	228 #define moonbr_luakey_finish_func(pool) ((void *)(intptr_t)(pool) + 2)
jbe@0	229
jbe@0	230
jbe@0	231 /* Global variables */
jbe@0	232
jbe@0	233 /* State of process execution */
jbe@0	234 static int moonbr_pstate = MOONBR_PSTATE_STARTUP;
jbe@0	235
jbe@0	236 /* Process ID of the main process */
jbe@0	237 static pid_t moonbr_masterpid;
jbe@0	238
jbe@0	239 /* Condition variables set by the signal handler */
jbe@0	240 static volatile sig_atomic_t moonbr_cond_poll = 0;
jbe@0	241 static volatile sig_atomic_t moonbr_cond_terminate = 0;
jbe@0	242 static volatile sig_atomic_t moonbr_cond_interrupt = 0;
jbe@0	243 static volatile sig_atomic_t moonbr_cond_child = 0;
jbe@0	244
jbe@0	245 /* Socket pair to denote signal delivery when signal handler was called just before poll() */
jbe@0	246 static int moonbr_poll_signalfds[2];
jbe@0	247 #define moonbr_poll_signalfd_read moonbr_poll_signalfds[0]
jbe@0	248 #define moonbr_poll_signalfd_write moonbr_poll_signalfds[1]
jbe@0	249
jbe@0	250 /* Global variables for pidfile and logging */
jbe@0	251 static struct pidfh *moonbr_pidfh = NULL;
jbe@0	252 static FILE *moonbr_logfile = NULL;
jbe@0	253 static int moonbr_use_syslog = 0;
jbe@0	254
jbe@0	255 /* First and last entry of linked list of all created pools during initialization */
jbe@0	256 static struct moonbr_pool *moonbr_first_pool = NULL;
jbe@0	257 static struct moonbr_pool *moonbr_last_pool = NULL;
jbe@0	258
jbe@0	259 /* Total count of pools */
jbe@0	260 static int moonbr_pool_count = 0;
jbe@0	261
jbe@0	262 /* Set to a nonzero value if dynamic part of 'moonbr_poll_fds' ('moonbr_poll_worker_fds') needs an update */
jbe@0	263 static int moonbr_poll_refresh_needed = 0;
jbe@0	264
jbe@0	265 /* Array passed to poll(), consisting of static part and dynamic part ('moonbr_poll_worker_fds') */
jbe@0	266 static struct pollfd moonbr_poll_fds = NULL; / the array */
jbe@0	267 static int moonbr_poll_fds_bufsize = 0; /* memory allocated for this number of elements */
jbe@0	268 static int moonbr_poll_fds_count = 0; /* total number of elements */
jbe@0	269 static int moonbr_poll_fds_static_count; /* number of elements in static part */
jbe@0	270
jbe@0	271 /* Dynamic part of 'moonbr_poll_fds' array */
jbe@0	272 #define moonbr_poll_worker_fds (moonbr_poll_fds+moonbr_poll_fds_static_count)
jbe@0	273
jbe@0	274 /* Additional information for dynamic part of 'moonbr_poll_fds' array */
jbe@0	275 struct moonbr_poll_worker moonbr_poll_workers; / the array */
jbe@0	276 static int moonbr_poll_workers_bufsize = 0; /* memory allocated for this number of elements */
jbe@0	277 static int moonbr_poll_worker_count = 0; /* number of elements in array */
jbe@0	278
jbe@0	279 /* Variable set to nonzero value to disallow further calls of 'listen' function */
jbe@0	280 static int moonbr_booted = 0;
jbe@0	281
jbe@0	282 /* Verbosity settings */
jbe@0	283 static int moonbr_debug = 0;
jbe@0	284 static int moonbr_stat = 0;
jbe@0	285
jbe@0	286 /* Memory consumption by Lua machine */
jbe@0	287 static size_t moonbr_memory_usage = 0;
jbe@0	288 static size_t moonbr_memory_limit = 0;
jbe@0	289
jbe@0	290
jbe@0	291 /* Functions for signal handling */
jbe@0	292
jbe@0	293 /* Signal handler for master and child processes */
jbe@0	294 static void moonbr_signal(int sig) {
jbe@0	295 if (getpid() == moonbr_masterpid) {
jbe@0	296 /* master process */
jbe@0	297 switch (sig) {
jbe@0	298 case SIGHUP:
jbe@0	299 case SIGINT:
jbe@0	300 /* fast shutdown requested */
jbe@0	301 moonbr_cond_interrupt = 1;
jbe@0	302 break;
jbe@0	303 case SIGTERM:
jbe@0	304 /* clean shutdown requested */
jbe@0	305 moonbr_cond_terminate = 1;
jbe@0	306 break;
jbe@0	307 case SIGCHLD:
jbe@0	308 /* child process terminated */
jbe@0	309 moonbr_cond_child = 1;
jbe@0	310 break;
jbe@0	311 }
jbe@0	312 if (moonbr_cond_poll) {
jbe@0	313 /* avoid race condition if signal handler is invoked right before poll() */
jbe@0	314 char buf[1] = {0};
jbe@20	315 write(moonbr_poll_signalfd_write, buf, 1);
jbe@0	316 }
jbe@0	317 } else {
jbe@0	318 /* child process forwards certain signals to parent process */
jbe@0	319 switch (sig) {
jbe@0	320 case SIGHUP:
jbe@0	321 case SIGINT:
jbe@0	322 case SIGTERM:
jbe@0	323 kill(moonbr_masterpid, sig);
jbe@0	324 }
jbe@0	325 }
jbe@0	326 }
jbe@0	327
jbe@0	328 /* Initialize signal handling */
jbe@0	329 static void moonbr_signal_init(){
jbe@0	330 moonbr_masterpid = getpid();
jbe@0	331 signal(SIGHUP, moonbr_signal);
jbe@0	332 signal(SIGINT, moonbr_signal);
jbe@0	333 signal(SIGTERM, moonbr_signal);
jbe@0	334 signal(SIGCHLD, moonbr_signal);
jbe@195	335 signal(SIGUSR1, moonbr_signal);
jbe@0	336 }
jbe@0	337
jbe@0	338
jbe@0	339 /* Functions for logging in master process */
jbe@0	340
jbe@0	341 /* Logs a pre-formatted message with given syslog() priority */
jbe@0	342 static void moonbr_log_msg(int priority, const char *msg) {
jbe@0	343 if (moonbr_logfile) {
jbe@0	344 /* logging to logfile desired (timestamp is prepended in that case) */
jbe@0	345 time_t now_time = 0;
jbe@0	346 struct tm now_tmstruct;
jbe@0	347 char timestr[MOONBR_LOG_MAXTIMELEN+1];
jbe@0	348 time(&now_time);
jbe@0	349 localtime_r(&now_time, &now_tmstruct);
jbe@0	350 if (!strftime(
jbe@0	351 timestr, MOONBR_LOG_MAXTIMELEN+1, "%Y-%m-%d %H:%M:%S %Z: ", &now_tmstruct
jbe@0	352 )) timestr[0] = 0;
jbe@0	353 fprintf(moonbr_logfile, "%s%s\n", timestr, msg);
jbe@0	354 }
jbe@0	355 if (moonbr_use_syslog) {
jbe@0	356 /* logging through syslog desired */
jbe@0	357 syslog(priority, "%s", msg);
jbe@0	358 }
jbe@0	359 }
jbe@0	360
jbe@0	361 /* Formats a message via vsnprintf() and logs it with given syslog() priority */
jbe@0	362 static void moonbr_log(int priority, const char *message, ...) {
jbe@0	363 char msgbuf[MOONBR_LOG_MAXMSGLEN+1]; /* buffer of static size to store formatted message */
jbe@0	364 int msglen; /* length of full message (may exceed MOONBR_LOG_MAXMSGLEN) */
jbe@0	365 {
jbe@0	366 /* pass variable arguments to vsnprintf() to format message */
jbe@0	367 va_list ap;
jbe@0	368 va_start(ap, message);
jbe@0	369 msglen = vsnprintf(msgbuf, MOONBR_LOG_MAXMSGLEN+1, message, ap);
jbe@0	370 va_end(ap);
jbe@0	371 }
jbe@0	372 {
jbe@0	373 /* split and log message line by line */
jbe@0	374 char *line = msgbuf;
jbe@0	375 while (1) {
jbe@0	376 char *endptr = strchr(line, '\n');
jbe@0	377 if (endptr) {
jbe@0	378 /* terminate string where newline character is found */
jbe@0	379 *endptr = 0;
jbe@0	380 } else if (line != msgbuf && msglen > MOONBR_LOG_MAXMSGLEN) {
jbe@0	381 /* break if line is incomplete and not the first line */
jbe@0	382 break;
jbe@0	383 }
jbe@0	384 moonbr_log_msg(priority, line);
jbe@0	385 if (!endptr) break; /* break if end of formatted message is reached */
jbe@0	386 line = endptr+1; /* otherwise continue with remaining message */
jbe@0	387 }
jbe@0	388 }
jbe@0	389 if (msglen > MOONBR_LOG_MAXMSGLEN) {
jbe@0	390 /* print warning if message was truncated */
jbe@0	391 moonbr_log_msg(priority, "Previous log message has been truncated due to excessive length");
jbe@0	392 }
jbe@0	393 }
jbe@0	394
jbe@0	395
jbe@0	396 /* Termination function */
jbe@0	397
jbe@0	398 /* Kill all child processes, remove PID file (if existent), and exit master process with given exitcode */
jbe@0	399 static void moonbr_terminate(int exitcode) {
jbe@0	400 {
jbe@0	401 struct moonbr_pool *pool;
jbe@0	402 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
jbe@0	403 {
jbe@0	404 struct moonbr_worker *worker;
jbe@0	405 for (worker=pool->first_worker; worker; worker=worker->next_worker) {
jbe@0	406 moonbr_log(LOG_INFO, "Sending SIGKILL to child with PID %i", (int)worker->pid);
jbe@0	407 if (kill(worker->pid, SIGKILL)) {
jbe@0	408 moonbr_log(LOG_ERR, "Error while killing child process: %s", strerror(errno));
jbe@0	409 }
jbe@0	410 }
jbe@0	411 }
jbe@0	412 {
jbe@0	413 int i;
jbe@0	414 for (i=0; i<pool->listener_count; i++) {
jbe@0	415 struct moonbr_listener *listener = &pool->listener[i];
jbe@0	416 if (listener->proto == MOONBR_PROTO_LOCAL) {
jbe@125	417 moonbr_log(LOG_INFO, "Unlinking local socket \"%s\"", listener->type_specific.socket.addr.addr_un.sun_path);
jbe@125	418 if (unlink(listener->type_specific.socket.addr.addr_un.sun_path)) {
jbe@0	419 moonbr_log(LOG_ERR, "Error while unlinking local socket: %s", strerror(errno));
jbe@0	420 }
jbe@0	421 }
jbe@0	422 }
jbe@0	423 }
jbe@0	424 }
jbe@0	425 }
jbe@0	426 moonbr_log(exitcode ? LOG_ERR : LOG_NOTICE, "Terminating with exit code %i", exitcode);
jbe@0	427 if (moonbr_pidfh && pidfile_remove(moonbr_pidfh)) {
jbe@0	428 moonbr_log(LOG_ERR, "Error while removing PID file: %s", strerror(errno));
jbe@0	429 }
jbe@0	430 exit(exitcode);
jbe@0	431 }
jbe@0	432
jbe@0	433 /* Terminate with either MOONBR_EXITCODE_STARTUPERROR or MOONBR_EXITCODE_RUNTIMEERROR */
jbe@0	434 #define moonbr_terminate_error() \
jbe@0	435 moonbr_terminate( \
jbe@0	436 moonbr_pstate == MOONBR_PSTATE_STARTUP ? \
jbe@0	437 MOONBR_EXITCODE_STARTUPERROR : \
jbe@0	438 MOONBR_EXITCODE_RUNTIMEERROR \
jbe@0	439 )
jbe@0	440
jbe@0	441
jbe@0	442 /* Helper functions */
jbe@0	443
jbe@0	444 /* Fills a 'struct timeval' structure with the current time (using CLOCK_MONOTONIC) */
jbe@0	445 static void moonbr_now(struct timeval *now) {
jbe@0	446 struct timespec ts = {0, };
jbe@0	447 if (clock_gettime(CLOCK_MONOTONIC, &ts)) {
jbe@0	448 moonbr_log(LOG_CRIT, "Error in clock_gettime() call: %s", strerror(errno));
jbe@0	449 moonbr_terminate_error();
jbe@0	450 }
jbe@0	451 *now = (struct timeval){ .tv_sec = ts.tv_sec, .tv_usec = ts.tv_nsec / 1000 };
jbe@0	452 }
jbe@0	453
jbe@0	454 /* Formats a 'struct timeval' value (not thread-safe) */
jbe@0	455 static char moonbr_format_timeval(struct timeval t) {
jbe@0	456 static char buf[32];
jbe@0	457 snprintf(buf, 32, "%ji.%06ji seconds", (intmax_t)t->tv_sec, (intmax_t)t->tv_usec);
jbe@0	458 return buf;
jbe@0	459 }
jbe@0	460
jbe@0	461
jbe@0	462 /* Functions for pool creation and startup */
jbe@0	463
jbe@0	464 /* Creates a 'struct moonbr_pool' structure with a given number of listeners */
jbe@0	465 static struct moonbr_pool *moonbr_create_pool(int listener_count) {
jbe@0	466 struct moonbr_pool *pool;
jbe@0	467 pool = calloc(1,
jbe@0	468 sizeof(struct moonbr_pool) + /* size of 'struct moonbr_pool' with one listener */
jbe@0	469 (listener_count-1) * sizeof(struct moonbr_listener) /* size of extra listeners */
jbe@0	470 );
jbe@0	471 if (!pool) {
jbe@0	472 moonbr_log(LOG_CRIT, "Memory allocation error");
jbe@0	473 moonbr_terminate_error();
jbe@0	474 }
jbe@0	475 pool->listener_count = listener_count;
jbe@0	476 {
jbe@0	477 /* initialization of listeners */
jbe@0	478 int i;
jbe@0	479 for (i=0; i<listener_count; i++) {
jbe@0	480 struct moonbr_listener *listener = &pool->listener[i];
jbe@0	481 listener->pool = pool;
jbe@0	482 listener->listenfd = -1;
jbe@0	483 listener->pollidx = -1;
jbe@0	484 }
jbe@0	485 }
jbe@0	486 return pool;
jbe@0	487 }
jbe@0	488
jbe@0	489 /* Destroys a 'struct moonbr_pool' structure before it has been started */
jbe@0	490 static void moonbr_destroy_pool(struct moonbr_pool *pool) {
jbe@0	491 int i;
jbe@0	492 for (i=0; i<pool->listener_count; i++) {
jbe@0	493 struct moonbr_listener *listener = &pool->listener[i];
jbe@0	494 if (
jbe@0	495 listener->proto == MOONBR_PROTO_INTERVAL &&
jbe@125	496 listener->type_specific.interval.name
jbe@0	497 ) {
jbe@125	498 free(listener->type_specific.interval.name);
jbe@0	499 }
jbe@0	500 }
jbe@0	501 free(pool);
jbe@0	502 }
jbe@0	503
jbe@0	504 /* Starts a all listeners in a pool */
jbe@0	505 static int moonbr_start_pool(struct moonbr_pool *pool) {
jbe@0	506 moonbr_log(LOG_INFO, "Creating pool", pool->poolnum);
jbe@0	507 {
jbe@0	508 int i;
jbe@0	509 for (i=0; i<pool->listener_count; i++) {
jbe@0	510 struct moonbr_listener *listener = &pool->listener[i];
jbe@0	511 switch (listener->proto) {
jbe@127	512 case MOONBR_PROTO_MAIN:
jbe@127	513 /* nothing to do here: starting main thread is performed in moonbr_run() function */
jbe@127	514 moonbr_log(LOG_INFO, "Adding main thread");
jbe@127	515 break;
jbe@0	516 case MOONBR_PROTO_INTERVAL:
jbe@17	517 /* nothing to do here: starting intervals is performed in moonbr_run() function */
jbe@125	518 if (!listener->type_specific.interval.name) {
jbe@0	519 moonbr_log(LOG_INFO, "Adding unnamed interval listener");
jbe@0	520 } else {
jbe@125	521 moonbr_log(LOG_INFO, "Adding interval listener \"%s\"", listener->type_specific.interval.name);
jbe@0	522 }
jbe@0	523 break;
jbe@0	524 case MOONBR_PROTO_LOCAL:
jbe@125	525 moonbr_log(LOG_INFO, "Adding local socket listener for path \"%s\"", listener->type_specific.socket.addr.addr_un.sun_path);
jbe@125	526 listener->listenfd = socket(PF_LOCAL, SOCK_STREAM\|SOCK_CLOEXEC\|SOCK_NONBLOCK, 0);
jbe@125	527 if (listener->listenfd == -1) goto moonbr_start_pool_error;
jbe@125	528 if (!unlink(listener->type_specific.socket.addr.addr_un.sun_path)) {
jbe@125	529 moonbr_log(LOG_WARNING, "Unlinked named socket \"%s\" prior to listening", listener->type_specific.socket.addr.addr_un.sun_path);
jbe@125	530 } else {
jbe@125	531 if (errno != ENOENT) {
jbe@125	532 moonbr_log(LOG_ERR, "Could not unlink named socket \"%s\" prior to listening: %s", listener->type_specific.socket.addr.addr_un.sun_path, strerror(errno));
jbe@125	533 }
jbe@125	534 }
jbe@125	535 if (
jbe@125	536 bind(listener->listenfd, &listener->type_specific.socket.addr.addr_abstract, listener->type_specific.socket.addrlen)
jbe@125	537 ) goto moonbr_start_pool_error;
jbe@125	538 if (listen(listener->listenfd, MOONBR_LISTEN_BACKLOG)) goto moonbr_start_pool_error;
jbe@125	539 break;
jbe@125	540 case MOONBR_PROTO_TCP:
jbe@125	541 moonbr_log(LOG_INFO, "Adding TCP listener on interface \"%s\", port %i", listener->proto_specific.tcp.ip, listener->proto_specific.tcp.port);
jbe@134	542 listener->listenfd = socket(listener->type_specific.socket.addr.addr_abstract.sa_family, SOCK_STREAM\|SOCK_CLOEXEC\|SOCK_NONBLOCK, 0); /* NOTE: not correctly using PF_* but AF_* constants here */
jbe@125	543 if (listener->listenfd == -1) goto moonbr_start_pool_error;
jbe@0	544 {
jbe@125	545 /* avoid "Address already in use" error when restarting service */
jbe@125	546 static const int reuseval = 1;
jbe@125	547 if (setsockopt(
jbe@125	548 listener->listenfd, SOL_SOCKET, SO_REUSEADDR, &reuseval, sizeof(reuseval)
jbe@125	549 )) goto moonbr_start_pool_error;
jbe@0	550 }
jbe@0	551 {
jbe@125	552 /* default to send TCP RST when process terminates unexpectedly */
jbe@125	553 static const struct linger lingerval = {
jbe@125	554 .l_onoff = 1,
jbe@125	555 .l_linger = 0
jbe@0	556 };
jbe@125	557 if (setsockopt(
jbe@125	558 listener->listenfd, SOL_SOCKET, SO_LINGER, &lingerval, sizeof(lingerval)
jbe@125	559 )) goto moonbr_start_pool_error;
jbe@0	560 }
jbe@125	561 if (
jbe@125	562 bind(listener->listenfd, &listener->type_specific.socket.addr.addr_abstract, listener->type_specific.socket.addrlen)
jbe@125	563 ) goto moonbr_start_pool_error;
jbe@125	564 if (listen(listener->listenfd, MOONBR_LISTEN_BACKLOG)) goto moonbr_start_pool_error;
jbe@0	565 break;
jbe@0	566 default:
jbe@0	567 moonbr_log(LOG_CRIT, "Internal error (should not happen): Unexpected value in listener.proto field");
jbe@0	568 moonbr_terminate_error();
jbe@0	569 }
jbe@0	570 }
jbe@0	571 goto moonbr_start_pool_ok;
jbe@0	572 moonbr_start_pool_error:
jbe@0	573 {
jbe@0	574 int j = i;
jbe@0	575 int errno2 = errno;
jbe@0	576 for (; i>=0; i--) {
jbe@0	577 struct moonbr_listener *listener = &pool->listener[i];
jbe@0	578 if (listener->listenfd != -1) close(listener->listenfd);
jbe@0	579 }
jbe@0	580 errno = errno2;
jbe@0	581 return j;
jbe@0	582 }
jbe@0	583 }
jbe@0	584 moonbr_start_pool_ok:
jbe@0	585 pool->poolnum = ++moonbr_pool_count;
jbe@0	586 moonbr_log(LOG_INFO, "Pool #%i created", pool->poolnum);
jbe@0	587 if (moonbr_last_pool) moonbr_last_pool->next_pool = pool;
jbe@0	588 else moonbr_first_pool = pool;
jbe@0	589 moonbr_last_pool = pool;
jbe@0	590 return -1;
jbe@0	591 }
jbe@0	592
jbe@0	593
jbe@0	594 /*** Function to send data and a file descriptor to child process */
jbe@0	595
jbe@0	596 /* Sends control message of one bye plus optional file descriptor plus optional pointer to child process */
jbe@0	597 static void moonbr_send_control_message(struct moonbr_worker worker, char status, int fd, void ptr) {
jbe@0	598 {
jbe@0	599 struct iovec iovector = { .iov_base = &status, .iov_len = 1 }; /* carrying status byte */
jbe@0	600 char control_message_buffer[CMSG_SPACE(sizeof(int))] = {0, }; /* used to transfer file descriptor */
jbe@0	601 struct msghdr message = { .msg_iov = &iovector, .msg_iovlen = 1 }; /* data structure passed to sendmsg() call */
jbe@0	602 if (moonbr_debug) {
jbe@0	603 if (fd == -1) {
jbe@0	604 moonbr_log(LOG_DEBUG, "Sending control message \"%c\" to child process in pool #%i (PID %i)", (int)status, worker->pool->poolnum, (int)worker->pid);
jbe@0	605 } else {
jbe@0	606 moonbr_log(LOG_DEBUG, "Sending control message \"%c\" with file descriptor #%i to child process in pool #%i (PID %i)", (int)status, fd, worker->pool->poolnum, (int)worker->pid);
jbe@0	607 }
jbe@0	608 }
jbe@0	609 if (fd != -1) {
jbe@0	610 /* attach control message with file descriptor */
jbe@0	611 message.msg_control = control_message_buffer;
jbe@0	612 message.msg_controllen = CMSG_SPACE(sizeof(int));
jbe@0	613 {
jbe@0	614 struct cmsghdr *control_message = CMSG_FIRSTHDR(&message);
jbe@0	615 control_message->cmsg_level = SOL_SOCKET;
jbe@0	616 control_message->cmsg_type = SCM_RIGHTS;
jbe@0	617 control_message->cmsg_len = CMSG_LEN(sizeof(int));
jbe@18	618 memcpy(CMSG_DATA(control_message), &fd, sizeof(int));
jbe@0	619 }
jbe@0	620 }
jbe@0	621 while (sendmsg(worker->controlfd, &message, MSG_NOSIGNAL) < 0) {
jbe@0	622 if (errno == EPIPE) {
jbe@0	623 moonbr_log(LOG_ERR, "Error while communicating with idle child process in pool #%i (PID %i): %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
jbe@0	624 return; /* do not close socket; socket is closed when reading from it */
jbe@0	625 }
jbe@0	626 if (errno != EINTR) {
jbe@0	627 moonbr_log(LOG_CRIT, "Unexpected error while communicating with idle child process in pool #%i (PID %i): %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
jbe@0	628 moonbr_terminate_error();
jbe@0	629 }
jbe@0	630 }
jbe@0	631 }
jbe@0	632 if (ptr) {
jbe@0	633 char buf[sizeof(void *)];
jbe@0	634 char *pos = buf;
jbe@0	635 int len = sizeof(void *);
jbe@0	636 ssize_t written;
jbe@0	637 if (moonbr_debug) {
jbe@0	638 moonbr_log(LOG_DEBUG, "Sending memory pointer to child process in pool #%i (PID %i)", (int)status, worker->pool->poolnum, (int)worker->pid);
jbe@0	639 }
jbe@18	640 memcpy(buf, &ptr, sizeof(void *));
jbe@0	641 while (len) {
jbe@0	642 written = send(worker->controlfd, pos, len, MSG_NOSIGNAL);
jbe@0	643 if (written > 0) {
jbe@0	644 pos += written;
jbe@0	645 len -= written;
jbe@0	646 } else if (errno == EPIPE) {
jbe@0	647 moonbr_log(LOG_ERR, "Error while communicating with idle child process in pool #%i (PID %i): %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
jbe@0	648 return; /* do not close socket; socket is closed when reading from it */
jbe@0	649 } else if (errno != EINTR) {
jbe@0	650 moonbr_log(LOG_CRIT, "Unexpected error while communicating with idle child process in pool #%i (PID %i): %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
jbe@0	651 moonbr_terminate_error();
jbe@0	652 }
jbe@0	653 }
jbe@0	654 }
jbe@0	655 }
jbe@0	656
jbe@0	657
jbe@0	658 /* Functions running in child process */
jbe@0	659
jbe@0	660 /* Logs an error in child process */
jbe@0	661 static void moonbr_child_log(const char *message) {
jbe@0	662 fprintf(stderr, "%s\n", message);
jbe@0	663 }
jbe@0	664
jbe@0	665 /* Logs a fatal error in child process and terminates process with error status */
jbe@0	666 static void moonbr_child_log_fatal(const char *message) {
jbe@0	667 moonbr_child_log(message);
jbe@0	668 exit(1);
jbe@0	669 }
jbe@0	670
jbe@0	671 /* Logs an error in child process while appending error string for global errno variable */
jbe@0	672 static void moonbr_child_log_errno(const char *message) {
jbe@0	673 char errmsg[MOONBR_MAXSTRERRORLEN];
jbe@20	674 strerror_r(errno, errmsg, MOONBR_MAXSTRERRORLEN); /* use thread-safe call in case child created threads */
jbe@0	675 fprintf(stderr, "%s: %s\n", message, errmsg);
jbe@0	676 }
jbe@0	677
jbe@0	678 /* Logs a fatal error in child process while appending error string for errno and terminating process */
jbe@0	679 static void moonbr_child_log_errno_fatal(const char *message) {
jbe@0	680 moonbr_child_log_errno(message);
jbe@0	681 exit(1);
jbe@0	682 }
jbe@0	683
jbe@0	684 /* Receives a control message consisting of one character plus an optional file descriptor from parent process */
jbe@0	685 static void moonbr_child_receive_control_message(int socketfd, char status, int fd) {
jbe@0	686 struct iovec iovector = { .iov_base = status, .iov_len = 1 }; /* reference to status byte variable */
jbe@0	687 char control_message_buffer[CMSG_SPACE(sizeof(int))] = {0, }; /* used to receive file descriptor */
jbe@0	688 struct msghdr message = { /* data structure passed to recvmsg() call */
jbe@0	689 .msg_iov = &iovector,
jbe@0	690 .msg_iovlen = 1,
jbe@0	691 .msg_control = control_message_buffer,
jbe@0	692 .msg_controllen = CMSG_SPACE(sizeof(int))
jbe@0	693 };
jbe@0	694 {
jbe@0	695 int received;
jbe@0	696 while ((received = recvmsg(socketfd, &message, MSG_CMSG_CLOEXEC)) < 0) {
jbe@0	697 if (errno != EINTR) {
jbe@0	698 moonbr_child_log_errno_fatal("Error while trying to receive connection socket from parent process");
jbe@0	699 }
jbe@0	700 }
jbe@0	701 if (!received) {
jbe@0	702 moonbr_child_log_fatal("Unexpected EOF while trying to receive connection socket from parent process");
jbe@0	703 }
jbe@0	704 }
jbe@0	705 {
jbe@0	706 struct cmsghdr *control_message = CMSG_FIRSTHDR(&message);
jbe@0	707 if (control_message) {
jbe@0	708 if (control_message->cmsg_level != SOL_SOCKET) {
jbe@0	709 moonbr_child_log_fatal("Received control message with cmsg_level not equal to SOL_SOCKET");
jbe@0	710 }
jbe@0	711 if (control_message->cmsg_type != SCM_RIGHTS) {
jbe@0	712 moonbr_child_log_fatal("Received control message with cmsg_type not equal to SCM_RIGHTS");
jbe@0	713 }
jbe@18	714 memcpy(fd, CMSG_DATA(control_message), sizeof(int));
jbe@0	715 } else {
jbe@0	716 *fd = -1;
jbe@0	717 }
jbe@0	718 }
jbe@0	719 }
jbe@0	720
jbe@0	721 /* Receives a pointer from parent process */
jbe@0	722 static void *moonbr_child_receive_pointer(int socketfd) {
jbe@0	723 char buf[sizeof(void *)];
jbe@0	724 char *pos = buf;
jbe@0	725 int len = sizeof(void *);
jbe@0	726 ssize_t bytes_read;
jbe@0	727 while (len) {
jbe@0	728 bytes_read = recv(socketfd, pos, len, 0);
jbe@0	729 if (bytes_read > 0) {
jbe@0	730 pos += bytes_read;
jbe@0	731 len -= bytes_read;
jbe@0	732 } else if (!bytes_read) {
jbe@0	733 moonbr_child_log_fatal("Unexpected EOF while trying to receive memory pointer from parent process");
jbe@0	734 } else if (errno != EINTR) {
jbe@0	735 moonbr_child_log_errno_fatal("Error while trying to receive memory pointer from parent process");
jbe@0	736 }
jbe@0	737 }
jbe@18	738 {
jbe@18	739 void ptr; / avoid breaking strict-aliasing rules */
jbe@18	740 memcpy(&ptr, buf, sizeof(void *));
jbe@18	741 return ptr;
jbe@18	742 }
jbe@0	743 }
jbe@0	744
jbe@0	745 /* Main function of child process to be called after fork() and file descriptor rearrangement */
jbe@0	746 void moonbr_child_run(struct moonbr_pool pool, lua_State L) {
jbe@0	747 char controlmsg;
jbe@88	748 int fd;
jbe@0	749 struct itimerval notimer = { { 0, }, { 0, } };
jbe@0	750 lua_rawgetp(L, LUA_REGISTRYINDEX, moonbr_luakey_prepare_func(pool));
jbe@0	751 if (lua_isnil(L, -1)) lua_pop(L, 1);
jbe@0	752 else if (lua_pcall(L, 0, 0, 1)) {
jbe@0	753 fprintf(stderr, "Error in \"prepare\" function: %s\n", lua_tostring(L, -1));
jbe@0	754 exit(1);
jbe@0	755 }
jbe@0	756 while (1) {
jbe@0	757 struct moonbr_listener *listener;
jbe@0	758 if (setitimer(ITIMER_REAL, &notimer, NULL)) {
jbe@0	759 moonbr_child_log_errno_fatal("Could not reset ITIMER_REAL via setitimer()");
jbe@0	760 }
jbe@0	761 controlmsg = MOONBR_STATUS_IDLE;
jbe@0	762 if (write(MOONBR_FD_CONTROL, &controlmsg, 1) <= 0) {
jbe@0	763 moonbr_child_log_errno_fatal("Error while sending ready message to parent process");
jbe@0	764 }
jbe@88	765 moonbr_child_receive_control_message(MOONBR_FD_CONTROL, &controlmsg, &fd);
jbe@0	766 if (!(
jbe@124	767 (controlmsg == MOONBR_COMMAND_TERMINATE && fd == -1) \|\|
jbe@124	768 (controlmsg == MOONBR_COMMAND_CONNECT)
jbe@0	769 )) {
jbe@0	770 moonbr_child_log_fatal("Received illegal control message from parent process");
jbe@0	771 }
jbe@0	772 if (controlmsg == MOONBR_COMMAND_TERMINATE) break;
jbe@0	773 listener = moonbr_child_receive_pointer(MOONBR_FD_CONTROL);
jbe@127	774 if (
jbe@127	775 listener->proto != MOONBR_PROTO_LOCAL &&
jbe@127	776 listener->proto != MOONBR_PROTO_TCP &&
jbe@127	777 fd >= 0
jbe@127	778 ) {
jbe@124	779 moonbr_child_log_fatal("Received unexpected file descriptor from parent process");
jbe@127	780 } else if (
jbe@127	781 listener->proto != MOONBR_PROTO_MAIN &&
jbe@127	782 listener->proto != MOONBR_PROTO_INTERVAL &&
jbe@127	783 fd < 0
jbe@127	784 ) {
jbe@124	785 moonbr_child_log_fatal("Missing file descriptor from parent process");
jbe@124	786 }
jbe@119	787 if (fd >= 0) moonbr_io_pushhandle(L, fd);
jbe@0	788 lua_rawgetp(L, LUA_REGISTRYINDEX, moonbr_luakey_connect_func(pool));
jbe@119	789 if (fd < 0) {
jbe@0	790 lua_newtable(L);
jbe@131	791 if (listener->proto == MOONBR_PROTO_MAIN) {
jbe@131	792 lua_pushboolean(L, 1);
jbe@131	793 lua_setfield(L, -2, "main");
jbe@131	794 } else if (listener->proto == MOONBR_PROTO_INTERVAL) {
jbe@131	795 lua_pushstring(L,
jbe@131	796 listener->type_specific.interval.name ?
jbe@131	797 listener->type_specific.interval.name : ""
jbe@131	798 );
jbe@131	799 lua_setfield(L, -2, "interval");
jbe@131	800 }
jbe@0	801 } else {
jbe@88	802 lua_pushvalue(L, -2);
jbe@0	803 }
jbe@0	804 if (lua_pcall(L, 1, 1, 1)) {
jbe@0	805 fprintf(stderr, "Error in \"connect\" function: %s\n", lua_tostring(L, -1));
jbe@0	806 exit(1);
jbe@0	807 }
jbe@119	808 if (fd >= 0) moonbr_io_closehandle(L, -2, 0); /* attemt clean close */
jbe@0	809 if (lua_type(L, -1) != LUA_TBOOLEAN \|\| !lua_toboolean(L, -1)) break;
jbe@0	810 #ifdef MOONBR_LUA_PANIC_BUG_WORKAROUND
jbe@0	811 lua_settop(L, 2);
jbe@0	812 #else
jbe@0	813 lua_settop(L, 1);
jbe@0	814 #endif
jbe@0	815 }
jbe@0	816 controlmsg = MOONBR_STATUS_GOODBYE;
jbe@0	817 if (write(MOONBR_FD_CONTROL, &controlmsg, 1) <= 0) {
jbe@0	818 moonbr_child_log_errno_fatal("Error while sending goodbye message to parent process");
jbe@0	819 }
jbe@0	820 if (close(MOONBR_FD_CONTROL) && errno != EINTR) {
jbe@0	821 moonbr_child_log_errno("Error while closing control socket");
jbe@0	822 }
jbe@0	823 lua_rawgetp(L, LUA_REGISTRYINDEX, moonbr_luakey_finish_func(pool));
jbe@0	824 if (lua_isnil(L, -1)) lua_pop(L, 1);
jbe@0	825 else if (lua_pcall(L, 0, 0, 1)) {
jbe@0	826 fprintf(stderr, "Error in \"finish\" function: %s\n", lua_tostring(L, -1));
jbe@0	827 exit(1);
jbe@0	828 }
jbe@0	829 lua_close(L);
jbe@0	830 exit(0);
jbe@0	831 }
jbe@0	832
jbe@0	833
jbe@0	834 /* Functions to spawn child process */
jbe@0	835
jbe@0	836 /* Helper function to send an error message to a file descriptor (not needing a file stream) */
jbe@0	837 static void moonbr_child_emergency_print(int fd, char *message) {
jbe@0	838 size_t len = strlen(message);
jbe@0	839 ssize_t written;
jbe@0	840 while (len) {
jbe@0	841 written = write(fd, message, len);
jbe@0	842 if (written > 0) {
jbe@0	843 message += written;
jbe@0	844 len -= written;
jbe@0	845 } else {
jbe@0	846 if (written != -1 \|\| errno != EINTR) break;
jbe@0	847 }
jbe@0	848 }
jbe@0	849 }
jbe@0	850
jbe@0	851 /* Helper function to send an error message plus a text for errno to a file descriptor and terminate the process */
jbe@0	852 static void moonbr_child_emergency_error(int fd, char *message) {
jbe@0	853 int errno2 = errno;
jbe@0	854 moonbr_child_emergency_print(fd, message);
jbe@0	855 moonbr_child_emergency_print(fd, ": ");
jbe@0	856 moonbr_child_emergency_print(fd, strerror(errno2));
jbe@0	857 moonbr_child_emergency_print(fd, "\n");
jbe@0	858 exit(1);
jbe@0	859 }
jbe@0	860
jbe@0	861 /* Creates a child process and (in case of success) registers it in the 'struct moonbr_pool' structure */
jbe@0	862 static int moonbr_create_worker(struct moonbr_pool pool, lua_State L) {
jbe@0	863 struct moonbr_worker *worker;
jbe@0	864 worker = calloc(1, sizeof(struct moonbr_worker));
jbe@0	865 if (!worker) {
jbe@0	866 moonbr_log(LOG_CRIT, "Memory allocation error");
jbe@0	867 return -1;
jbe@0	868 }
jbe@0	869 worker->pool = pool;
jbe@0	870 {
jbe@0	871 int controlfds[2];
jbe@0	872 int errorfds[2];
jbe@0	873 if (socketpair(PF_LOCAL, SOCK_STREAM \| SOCK_CLOEXEC, 0, controlfds)) {
jbe@0	874 moonbr_log(LOG_ERR, "Could not create control socket pair for communcation with child process: %s", strerror(errno));
jbe@0	875 free(worker);
jbe@0	876 return -1;
jbe@0	877 }
jbe@0	878 if (socketpair(PF_LOCAL, SOCK_STREAM \| SOCK_CLOEXEC, 0, errorfds)) {
jbe@0	879 moonbr_log(LOG_ERR, "Could not create socket pair to redirect stderr of child process: %s", strerror(errno));
jbe@0	880 close(controlfds[0]);
jbe@0	881 close(controlfds[1]);
jbe@0	882 free(worker);
jbe@0	883 return -1;
jbe@0	884 }
jbe@0	885 if (moonbr_logfile && fflush(moonbr_logfile)) {
jbe@0	886 moonbr_log(LOG_CRIT, "Could not flush log file prior to forking: %s", strerror(errno));
jbe@0	887 moonbr_terminate_error();
jbe@0	888 }
jbe@0	889 worker->pid = fork();
jbe@0	890 if (worker->pid == -1) {
jbe@0	891 moonbr_log(LOG_ERR, "Could not fork: %s", strerror(errno));
jbe@0	892 close(controlfds[0]);
jbe@0	893 close(controlfds[1]);
jbe@0	894 close(errorfds[0]);
jbe@0	895 close(errorfds[1]);
jbe@0	896 free(worker);
jbe@0	897 return -1;
jbe@0	898 } else if (!worker->pid) {
jbe@0	899 moonbr_pstate = MOONBR_PSTATE_FORKED;
jbe@0	900 #ifdef MOONBR_LUA_PANIC_BUG_WORKAROUND
jbe@0	901 lua_pushliteral(L, "Failed to pass error message due to bug in Lua panic handler (hint: not enough memory?)");
jbe@0	902 #endif
jbe@0	903 moonbr_memory_limit = pool->memory_limit;
jbe@0	904 if (moonbr_pidfh && pidfile_close(moonbr_pidfh)) {
jbe@0	905 moonbr_child_emergency_error(errorfds[1], "Could not close PID file in forked child process");
jbe@0	906 }
jbe@0	907 if (moonbr_logfile && moonbr_logfile != stderr && fclose(moonbr_logfile)) {
jbe@0	908 moonbr_child_emergency_error(errorfds[1], "Could not close log file in forked child process");
jbe@0	909 }
jbe@0	910 if (dup2(errorfds[1], MOONBR_FD_STDERR) == -1) {
jbe@0	911 moonbr_child_emergency_error(errorfds[1], "Could not duplicate socket to stderr file descriptor");
jbe@0	912 }
jbe@0	913 if (dup2(controlfds[1], MOONBR_FD_CONTROL) == -1) {
jbe@0	914 moonbr_child_emergency_error(errorfds[1], "Could not duplicate control socket");
jbe@0	915 }
jbe@0	916 closefrom(MOONBR_FD_END);
jbe@0	917 moonbr_child_run(pool, L);
jbe@0	918 }
jbe@0	919 if (moonbr_stat) {
jbe@0	920 moonbr_log(LOG_INFO, "Created new worker in pool #%i with PID %i", worker->pool->poolnum, (int)worker->pid);
jbe@0	921 }
jbe@0	922 worker->controlfd = controlfds[0];
jbe@0	923 worker->errorfd = errorfds[0];
jbe@0	924 if (close(controlfds[1]) && errno != EINTR) {
jbe@0	925 moonbr_log(LOG_CRIT, "Could not close opposite end of control file descriptor after forking");
jbe@0	926 moonbr_terminate_error();
jbe@0	927 }
jbe@0	928 if (close(errorfds[1]) && errno != EINTR) {
jbe@0	929 moonbr_log(LOG_CRIT, "Could not close opposite end of control file descriptor after forking");
jbe@0	930 moonbr_terminate_error();
jbe@0	931 }
jbe@0	932 }
jbe@0	933 worker->prev_worker = pool->last_worker;
jbe@0	934 if (worker->prev_worker) worker->prev_worker->next_worker = worker;
jbe@0	935 else pool->first_worker = worker;
jbe@0	936 pool->last_worker = worker;
jbe@0	937 pool->unassigned_worker_count++;
jbe@0	938 pool->total_worker_count++;
jbe@0	939 pool->worker_count_stat = 1;
jbe@0	940 moonbr_poll_refresh_needed = 1;
jbe@0	941 return 0; /* return zero only in case of success */
jbe@0	942 }
jbe@0	943
jbe@0	944
jbe@0	945 /* Functions for queues of 'struct moonbr_listener' */
jbe@0	946
jbe@0	947 /* Appends a 'struct moonbr_listener' to the queue of idle listeners and registers it for poll() */
jbe@0	948 static void moonbr_add_idle_listener(struct moonbr_listener *listener) {
jbe@0	949 listener->prev_listener = listener->pool->last_idle_listener;
jbe@0	950 if (listener->prev_listener) listener->prev_listener->next_listener = listener;
jbe@0	951 else listener->pool->first_idle_listener = listener;
jbe@0	952 listener->pool->last_idle_listener = listener;
jbe@0	953 if (listener->pollidx != -1) moonbr_poll_fds[listener->pollidx].events \|= POLLIN;
jbe@0	954 }
jbe@0	955
jbe@0	956 /* Removes a 'struct moonbr_listener' from the queue of idle listeners and unregisters it from poll() */
jbe@0	957 static void moonbr_remove_idle_listener(struct moonbr_listener *listener) {
jbe@0	958 if (listener->prev_listener) listener->prev_listener->next_listener = listener->next_listener;
jbe@0	959 else listener->pool->first_idle_listener = listener->next_listener;
jbe@0	960 if (listener->next_listener) listener->next_listener->prev_listener = listener->prev_listener;
jbe@0	961 else listener->pool->last_idle_listener = listener->prev_listener;
jbe@0	962 listener->prev_listener = NULL;
jbe@0	963 listener->next_listener = NULL;
jbe@0	964 if (listener->pollidx != -1) moonbr_poll_fds[listener->pollidx].events &= ~POLLIN;
jbe@0	965 }
jbe@0	966
jbe@0	967 /* Adds a listener to the queue of connected listeners (i.e. waiting to have their incoming connection accepted) */
jbe@0	968 static void moonbr_add_connected_listener(struct moonbr_listener *listener) {
jbe@0	969 listener->prev_listener = listener->pool->last_connected_listener;
jbe@0	970 if (listener->prev_listener) listener->prev_listener->next_listener = listener;
jbe@0	971 else listener->pool->first_connected_listener = listener;
jbe@0	972 listener->pool->last_connected_listener = listener;
jbe@0	973 }
jbe@0	974
jbe@0	975 /* Removes and returns the first connected listener in the queue */
jbe@0	976 static struct moonbr_listener moonbr_pop_connected_listener(struct moonbr_pool pool) {
jbe@0	977 struct moonbr_listener *listener = pool->first_connected_listener;
jbe@0	978 listener->pool->first_connected_listener = listener->next_listener;
jbe@0	979 if (listener->pool->first_connected_listener) listener->pool->first_connected_listener->prev_listener = NULL;
jbe@0	980 else listener->pool->last_connected_listener = NULL;
jbe@0	981 listener->next_listener = NULL;
jbe@0	982 return listener;
jbe@0	983 }
jbe@0	984
jbe@0	985
jbe@0	986 /* Functions to handle polling */
jbe@0	987
jbe@0	988 /* Returns an index to a new initialized entry in moonbr_poll_fds[] */
jbe@0	989 int moonbr_poll_fds_nextindex() {
jbe@0	990 if (moonbr_poll_fds_count >= moonbr_poll_fds_bufsize) {
jbe@0	991 if (moonbr_poll_fds_bufsize) moonbr_poll_fds_bufsize *= 2;
jbe@0	992 else moonbr_poll_fds_bufsize = 1;
jbe@0	993 moonbr_poll_fds = realloc(
jbe@0	994 moonbr_poll_fds, moonbr_poll_fds_bufsize * sizeof(struct pollfd)
jbe@0	995 );
jbe@0	996 if (!moonbr_poll_fds) {
jbe@0	997 moonbr_log(LOG_CRIT, "Memory allocation error");
jbe@0	998 moonbr_terminate_error();
jbe@0	999 }
jbe@0	1000 }
jbe@0	1001 moonbr_poll_fds[moonbr_poll_fds_count] = (struct pollfd){0, };
jbe@0	1002 return moonbr_poll_fds_count++;
jbe@0	1003 }
jbe@0	1004
jbe@0	1005 /* Returns an index to a new initialized entry in moonbr_poll_workers[] */
jbe@0	1006 int moonbr_poll_workers_nextindex() {
jbe@0	1007 if (moonbr_poll_worker_count >= moonbr_poll_workers_bufsize) {
jbe@0	1008 if (moonbr_poll_workers_bufsize) moonbr_poll_workers_bufsize *= 2;
jbe@0	1009 else moonbr_poll_workers_bufsize = 1;
jbe@0	1010 moonbr_poll_workers = realloc(
jbe@0	1011 moonbr_poll_workers, moonbr_poll_workers_bufsize * sizeof(struct moonbr_poll_worker)
jbe@0	1012 );
jbe@0	1013 if (!moonbr_poll_workers) {
jbe@0	1014 moonbr_log(LOG_CRIT, "Memory allocation error");
jbe@0	1015 moonbr_terminate_error();
jbe@0	1016 }
jbe@0	1017 }
jbe@0	1018 moonbr_poll_workers[moonbr_poll_worker_count] = (struct moonbr_poll_worker){0, };
jbe@0	1019 return moonbr_poll_worker_count++;
jbe@0	1020 }
jbe@0	1021
jbe@0	1022 /* Queues all listeners as idle, and initializes static part of moonbr_poll_fds[], which is passed to poll() */
jbe@0	1023 static void moonbr_poll_init() {
jbe@0	1024 if (socketpair(
jbe@0	1025 PF_LOCAL,
jbe@0	1026 SOCK_STREAM \| SOCK_CLOEXEC \| SOCK_NONBLOCK,
jbe@0	1027 0,
jbe@0	1028 moonbr_poll_signalfds
jbe@0	1029 )) {
jbe@0	1030 moonbr_log(LOG_CRIT, "Could not create socket pair for signal delivery during polling: %s", strerror(errno));
jbe@0	1031 moonbr_terminate_error();
jbe@0	1032 }
jbe@0	1033 {
jbe@0	1034 int j = moonbr_poll_fds_nextindex();
jbe@0	1035 struct pollfd *pollfd = &moonbr_poll_fds[j];
jbe@0	1036 pollfd->fd = moonbr_poll_signalfd_read;
jbe@0	1037 pollfd->events = POLLIN;
jbe@0	1038 }
jbe@0	1039 {
jbe@0	1040 struct moonbr_pool *pool;
jbe@0	1041 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
jbe@0	1042 int i;
jbe@0	1043 for (i=0; i<pool->listener_count; i++) {
jbe@0	1044 struct moonbr_listener *listener = &pool->listener[i];
jbe@0	1045 if (listener->listenfd != -1) {
jbe@0	1046 int j = moonbr_poll_fds_nextindex();
jbe@0	1047 listener->pollidx = j;
jbe@0	1048 moonbr_poll_fds[j].fd = listener->listenfd;
jbe@0	1049 }
jbe@0	1050 moonbr_add_idle_listener(listener);
jbe@0	1051 }
jbe@0	1052 }
jbe@0	1053 }
jbe@0	1054 moonbr_poll_fds_static_count = moonbr_poll_fds_count; /* remember size of static part of array */
jbe@0	1055 }
jbe@0	1056
jbe@0	1057 /* Disables polling of all listeners (required for clean shutdown) */
jbe@0	1058 static void moonbr_poll_shutdown() {
jbe@0	1059 int i;
jbe@0	1060 for (i=1; i<moonbr_poll_fds_static_count; i++) {
jbe@0	1061 moonbr_poll_fds[i].fd = -1;
jbe@0	1062 }
jbe@0	1063 }
jbe@0	1064
jbe@0	1065 /* (Re)builds dynamic part of moonbr_poll_fds[] array, and (re)builds moonbr_poll_workers[] array */
jbe@0	1066 static void moonbr_poll_refresh() {
jbe@0	1067 moonbr_poll_refresh_needed = 0;
jbe@0	1068 moonbr_poll_fds_count = moonbr_poll_fds_static_count;
jbe@0	1069 moonbr_poll_worker_count = 0;
jbe@0	1070 {
jbe@0	1071 struct moonbr_pool *pool;
jbe@0	1072 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
jbe@0	1073 struct moonbr_worker *worker;
jbe@0	1074 for (worker=pool->first_worker; worker; worker=worker->next_worker) {
jbe@0	1075 if (worker->controlfd != -1) {
jbe@0	1076 int j = moonbr_poll_fds_nextindex();
jbe@0	1077 int k = moonbr_poll_workers_nextindex();
jbe@0	1078 struct pollfd *pollfd = &moonbr_poll_fds[j];
jbe@0	1079 struct moonbr_poll_worker *poll_worker = &moonbr_poll_workers[k];
jbe@0	1080 pollfd->fd = worker->controlfd;
jbe@0	1081 pollfd->events = POLLIN;
jbe@0	1082 poll_worker->channel = MOONBR_POLL_WORKER_CONTROLCHANNEL;
jbe@0	1083 poll_worker->worker = worker;
jbe@0	1084 }
jbe@0	1085 if (worker->errorfd != -1) {
jbe@0	1086 int j = moonbr_poll_fds_nextindex();
jbe@0	1087 int k = moonbr_poll_workers_nextindex();
jbe@0	1088 struct pollfd *pollfd = &moonbr_poll_fds[j];
jbe@0	1089 struct moonbr_poll_worker *poll_worker = &moonbr_poll_workers[k];
jbe@0	1090 pollfd->fd = worker->errorfd;
jbe@0	1091 pollfd->events = POLLIN;
jbe@0	1092 poll_worker->channel = MOONBR_POLL_WORKER_ERRORCHANNEL;
jbe@0	1093 poll_worker->worker = worker;
jbe@0	1094 }
jbe@0	1095 }
jbe@0	1096 }
jbe@0	1097 }
jbe@0	1098 }
jbe@0	1099
jbe@0	1100 /* resets socket and 'revents' field of moonbr_poll_fds[] for signal delivery just before poll() is called */
jbe@0	1101 static void moonbr_poll_reset_signal() {
jbe@0	1102 ssize_t readcount;
jbe@0	1103 char buf[1];
jbe@0	1104 moonbr_poll_fds[0].revents = 0;
jbe@0	1105 while ((readcount = read(moonbr_poll_signalfd_read, buf, 1)) < 0) {
jbe@0	1106 if (errno == EAGAIN) break;
jbe@0	1107 if (errno != EINTR) {
jbe@0	1108 moonbr_log(LOG_CRIT, "Error while reading from signal delivery socket: %s", strerror(errno));
jbe@0	1109 moonbr_terminate_error();
jbe@0	1110 }
jbe@0	1111 }
jbe@0	1112 if (!readcount) {
jbe@0	1113 moonbr_log(LOG_CRIT, "Unexpected EOF when reading from signal delivery socket: %s", strerror(errno));
jbe@0	1114 moonbr_terminate_error();
jbe@0	1115 }
jbe@0	1116 }
jbe@0	1117
jbe@0	1118
jbe@0	1119 /* Shutdown initiation */
jbe@0	1120
jbe@0	1121 /* Sets global variable 'moonbr_shutdown_in_progress', closes listeners, and demands worker termination */
jbe@0	1122 static void moonbr_initiate_shutdown() {
jbe@0	1123 struct moonbr_pool *pool;
jbe@0	1124 int i;
jbe@0	1125 if (moonbr_shutdown_in_progress) {
jbe@0	1126 moonbr_log(LOG_NOTICE, "Shutdown already in progress");
jbe@0	1127 return;
jbe@0	1128 }
jbe@0	1129 moonbr_shutdown_in_progress = 1;
jbe@0	1130 moonbr_log(LOG_NOTICE, "Initiate shutdown");
jbe@0	1131 for (pool = moonbr_first_pool; pool; pool = pool->next_pool) {
jbe@0	1132 for (i=0; i<pool->listener_count; i++) {
jbe@0	1133 struct moonbr_listener *listener = &pool->listener[i];
jbe@0	1134 if (listener->listenfd != -1) {
jbe@0	1135 if (close(listener->listenfd) && errno != EINTR) {
jbe@0	1136 moonbr_log(LOG_CRIT, "Could not close listening socket: %s", strerror(errno));
jbe@0	1137 moonbr_terminate_error();
jbe@0	1138 }
jbe@0	1139 }
jbe@0	1140 }
jbe@0	1141 }
jbe@0	1142 moonbr_poll_shutdown(); /* avoids loops due to error condition when polling closed listeners */
jbe@195	1143 {
jbe@195	1144 pid_t pgrp = getpgrp();
jbe@195	1145 moonbr_log(LOG_INFO, "Sending SIGUSR1 to all processes in group %i", (int)pgrp);
jbe@195	1146 if (killpg(pgrp, SIGUSR1)) {
jbe@195	1147 moonbr_log(LOG_WARNING, "Error while sending SIGUSR1 to own process group: %s", strerror(errno));
jbe@195	1148 }
jbe@195	1149 }
jbe@0	1150 }
jbe@0	1151
jbe@0	1152
jbe@128	1153 /* Functions to handle previously created 'struct moonbr_worker' structures */
jbe@128	1154
jbe@128	1155 #define moonbr_try_destroy_worker_stat(str, field) \
jbe@128	1156 moonbr_log(LOG_INFO, "Resource usage in pool #%i for PID %i: " str " %li", worker->pool->poolnum, (int)worker->pid, (long)childusage.field);
jbe@128	1157
jbe@128	1158 /* Destroys a worker structure if socket connections have been closed and child process has terminated */
jbe@128	1159 static int moonbr_try_destroy_worker(struct moonbr_worker *worker) {
jbe@128	1160 if (worker->controlfd != -1 \|\| worker->errorfd != -1) return MOONBR_DESTROY_NONE;
jbe@128	1161 {
jbe@128	1162 int childstatus;
jbe@128	1163 struct rusage childusage;
jbe@128	1164 {
jbe@128	1165 pid_t waitedpid;
jbe@128	1166 while (
jbe@128	1167 (waitedpid = wait4(worker->pid, &childstatus, WNOHANG, &childusage)) == -1
jbe@128	1168 ) {
jbe@128	1169 if (errno != EINTR) {
jbe@128	1170 moonbr_log(LOG_CRIT, "Error in wait4() call: %s", strerror(errno));
jbe@128	1171 moonbr_terminate_error();
jbe@128	1172 }
jbe@128	1173 }
jbe@128	1174 if (!waitedpid) return 0; /* return 0 if worker couldn't be destroyed */
jbe@128	1175 if (waitedpid != worker->pid) {
jbe@128	1176 moonbr_log(LOG_CRIT, "Wrong PID returned by wait4() call");
jbe@128	1177 moonbr_terminate_error();
jbe@128	1178 }
jbe@128	1179 }
jbe@128	1180 if (WIFEXITED(childstatus)) {
jbe@128	1181 if (WEXITSTATUS(childstatus) \|\| moonbr_stat) {
jbe@128	1182 moonbr_log(
jbe@128	1183 WEXITSTATUS(childstatus) ? LOG_WARNING : LOG_INFO,
jbe@128	1184 "Child process in pool #%i with PID %i returned with exit code %i", worker->pool->poolnum, (int)worker->pid, WEXITSTATUS(childstatus)
jbe@128	1185 );
jbe@128	1186 }
jbe@128	1187 } else if (WIFSIGNALED(childstatus)) {
jbe@128	1188 if (WCOREDUMP(childstatus)) {
jbe@128	1189 moonbr_log(LOG_ERR, "Child process in pool #%i with PID %i died from signal %i (core dump was created)", worker->pool->poolnum, (int)worker->pid, WTERMSIG(childstatus));
jbe@128	1190 } else if (WTERMSIG(childstatus) == SIGALRM) {
jbe@128	1191 moonbr_log(LOG_WARNING, "Child process in pool #%i with PID %i exited prematurely due to timeout", worker->pool->poolnum, (int)worker->pid);
jbe@128	1192 } else {
jbe@128	1193 moonbr_log(LOG_ERR, "Child process in pool #%i with PID %i died from signal %i", worker->pool->poolnum, (int)worker->pid, WTERMSIG(childstatus));
jbe@128	1194 }
jbe@128	1195 } else {
jbe@128	1196 moonbr_log(LOG_CRIT, "Illegal exit status from child process in pool #%i with PID %i", worker->pool->poolnum, (int)worker->pid);
jbe@128	1197 moonbr_terminate_error();
jbe@128	1198 }
jbe@128	1199 if (moonbr_stat) {
jbe@128	1200 moonbr_log(LOG_INFO, "Resource usage in pool #%i for PID %i: user time %s", worker->pool->poolnum, (int)worker->pid, moonbr_format_timeval(&childusage.ru_utime));
jbe@128	1201 moonbr_log(LOG_INFO, "Resource usage in pool #%i for PID %i: system time %s", worker->pool->poolnum, (int)worker->pid, moonbr_format_timeval(&childusage.ru_stime));
jbe@128	1202 moonbr_try_destroy_worker_stat("max resident set size", ru_maxrss);
jbe@128	1203 moonbr_try_destroy_worker_stat("integral shared memory size", ru_ixrss);
jbe@128	1204 moonbr_try_destroy_worker_stat("integral unshared data", ru_idrss);
jbe@128	1205 moonbr_try_destroy_worker_stat("integral unshared stack", ru_isrss);
jbe@128	1206 moonbr_try_destroy_worker_stat("page replaims", ru_minflt);
jbe@128	1207 moonbr_try_destroy_worker_stat("page faults", ru_majflt);
jbe@128	1208 moonbr_try_destroy_worker_stat("swaps", ru_nswap);
jbe@128	1209 moonbr_try_destroy_worker_stat("block input operations", ru_inblock);
jbe@128	1210 moonbr_try_destroy_worker_stat("block output operations", ru_oublock);
jbe@128	1211 moonbr_try_destroy_worker_stat("messages sent", ru_msgsnd);
jbe@128	1212 moonbr_try_destroy_worker_stat("messages received", ru_msgrcv);
jbe@128	1213 moonbr_try_destroy_worker_stat("signals received", ru_nsignals);
jbe@128	1214 moonbr_try_destroy_worker_stat("voluntary context switches", ru_nvcsw);
jbe@128	1215 moonbr_try_destroy_worker_stat("involuntary context switches", ru_nivcsw);
jbe@128	1216 }
jbe@128	1217 }
jbe@128	1218 {
jbe@128	1219 int retval = (
jbe@128	1220 (worker->idle \|\| worker->assigned) ?
jbe@128	1221 MOONBR_DESTROY_IDLE_OR_ASSIGNED :
jbe@128	1222 MOONBR_DESTROY_PREPARE
jbe@128	1223 );
jbe@128	1224 if (worker->main) moonbr_initiate_shutdown();
jbe@128	1225 if (worker->prev_worker) worker->prev_worker->next_worker = worker->next_worker;
jbe@128	1226 else worker->pool->first_worker = worker->next_worker;
jbe@128	1227 if (worker->next_worker) worker->next_worker->prev_worker = worker->prev_worker;
jbe@128	1228 else worker->pool->last_worker = worker->prev_worker;
jbe@128	1229 if (worker->idle) {
jbe@128	1230 if (worker->prev_idle_worker) worker->prev_idle_worker->next_idle_worker = worker->next_idle_worker;
jbe@128	1231 else worker->pool->first_idle_worker = worker->next_idle_worker;
jbe@128	1232 if (worker->next_idle_worker) worker->next_idle_worker->prev_idle_worker = worker->prev_idle_worker;
jbe@128	1233 else worker->pool->last_idle_worker = worker->prev_idle_worker;
jbe@128	1234 worker->pool->idle_worker_count--;
jbe@128	1235 }
jbe@128	1236 if (!worker->assigned) worker->pool->unassigned_worker_count--;
jbe@128	1237 worker->pool->total_worker_count--;
jbe@128	1238 worker->pool->worker_count_stat = 1;
jbe@128	1239 if (worker->errorlinebuf) free(worker->errorlinebuf);
jbe@128	1240 free(worker);
jbe@128	1241 return retval;
jbe@128	1242 }
jbe@128	1243 }
jbe@128	1244
jbe@128	1245 /* Marks a worker as idle and stores it in a queue, optionally setting 'idle_expiration' value */
jbe@128	1246 static void moonbr_add_idle_worker(struct moonbr_worker *worker) {
jbe@128	1247 worker->prev_idle_worker = worker->pool->last_idle_worker;
jbe@128	1248 if (worker->prev_idle_worker) worker->prev_idle_worker->next_idle_worker = worker;
jbe@128	1249 else worker->pool->first_idle_worker = worker;
jbe@128	1250 worker->pool->last_idle_worker = worker;
jbe@128	1251 worker->idle = 1;
jbe@128	1252 worker->pool->idle_worker_count++;
jbe@128	1253 if (worker->assigned) {
jbe@128	1254 worker->assigned = 0;
jbe@128	1255 worker->pool->unassigned_worker_count++;
jbe@128	1256 }
jbe@128	1257 worker->pool->worker_count_stat = 1;
jbe@128	1258 if (timerisset(&worker->pool->idle_timeout)) {
jbe@128	1259 struct timeval now;
jbe@128	1260 moonbr_now(&now);
jbe@128	1261 timeradd(&now, &worker->pool->idle_timeout, &worker->idle_expiration);
jbe@128	1262 }
jbe@128	1263 }
jbe@128	1264
jbe@128	1265 /* Pops a worker from the queue of idle workers (idle queue must not be empty) */
jbe@128	1266 static struct moonbr_worker moonbr_pop_idle_worker(struct moonbr_pool pool) {
jbe@128	1267 struct moonbr_worker *worker;
jbe@128	1268 worker = pool->first_idle_worker;
jbe@128	1269 pool->first_idle_worker = worker->next_idle_worker;
jbe@128	1270 if (pool->first_idle_worker) pool->first_idle_worker->prev_idle_worker = NULL;
jbe@128	1271 else pool->last_idle_worker = NULL;
jbe@128	1272 worker->next_idle_worker = NULL;
jbe@128	1273 worker->idle = 0;
jbe@128	1274 worker->pool->idle_worker_count--;
jbe@128	1275 worker->assigned = 1;
jbe@128	1276 worker->pool->unassigned_worker_count--;
jbe@128	1277 worker->pool->worker_count_stat = 1;
jbe@128	1278 return worker;
jbe@128	1279 }
jbe@128	1280
jbe@128	1281
jbe@0	1282 /* Functions to communicate with child processes */
jbe@0	1283
jbe@0	1284 /* Tells child process to terminate */
jbe@0	1285 static void moonbr_terminate_idle_worker(struct moonbr_worker *worker) {
jbe@0	1286 moonbr_send_control_message(worker, MOONBR_COMMAND_TERMINATE, -1, NULL);
jbe@0	1287 }
jbe@0	1288
jbe@0	1289 /* Handles status messages from child process */
jbe@0	1290 static void moonbr_read_controlchannel(struct moonbr_worker *worker) {
jbe@0	1291 char controlmsg;
jbe@0	1292 {
jbe@0	1293 ssize_t bytes_read;
jbe@0	1294 while ((bytes_read = read(worker->controlfd, &controlmsg, 1)) <= 0) {
jbe@0	1295 if (bytes_read == 0 \|\| errno == ECONNRESET) {
jbe@0	1296 moonbr_log(LOG_WARNING, "Child process in pool #%i with PID %i unexpectedly closed control socket", worker->pool->poolnum, (int)worker->pid);
jbe@0	1297 if (close(worker->controlfd) && errno != EINTR) {
jbe@0	1298 moonbr_log(LOG_CRIT, "Error while closing control socket to child process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
jbe@0	1299 moonbr_terminate_error();
jbe@0	1300 }
jbe@0	1301 worker->controlfd = -1;
jbe@0	1302 moonbr_poll_refresh_needed = 1;
jbe@0	1303 return;
jbe@0	1304 }
jbe@0	1305 if (errno != EINTR) {
jbe@0	1306 moonbr_log(LOG_CRIT, "Unexpected error while reading control socket from child process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
jbe@0	1307 moonbr_terminate_error();
jbe@0	1308 }
jbe@0	1309 }
jbe@0	1310 }
jbe@0	1311 if (worker->idle) {
jbe@0	1312 moonbr_log(LOG_CRIT, "Unexpected data from supposedly idle child process in pool #%i with PID %i", worker->pool->poolnum, (int)worker->pid);
jbe@0	1313 moonbr_terminate_error();
jbe@0	1314 }
jbe@0	1315 if (moonbr_debug) {
jbe@0	1316 moonbr_log(LOG_DEBUG, "Received control message from child in pool #%i with PID %i: \"%c\"", worker->pool->poolnum, (int)worker->pid, (int)controlmsg);
jbe@0	1317 }
jbe@0	1318 switch (controlmsg) {
jbe@0	1319 case MOONBR_STATUS_IDLE:
jbe@0	1320 if (moonbr_stat) {
jbe@0	1321 moonbr_log(LOG_INFO, "Child process in pool #%i with PID %i reports as idle", worker->pool->poolnum, (int)worker->pid);
jbe@0	1322 }
jbe@0	1323 moonbr_add_idle_worker(worker);
jbe@0	1324 break;
jbe@0	1325 case MOONBR_STATUS_GOODBYE:
jbe@0	1326 if (moonbr_stat) {
jbe@0	1327 moonbr_log(LOG_INFO, "Child process in pool #%i with PID %i announced termination", worker->pool->poolnum, (int)worker->pid);
jbe@0	1328 }
jbe@0	1329 if (close(worker->controlfd) && errno != EINTR) {
jbe@0	1330 moonbr_log(LOG_CRIT, "Error while closing control socket to child process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
jbe@0	1331 moonbr_terminate_error();
jbe@0	1332 }
jbe@0	1333 worker->controlfd = -1;
jbe@0	1334 moonbr_poll_refresh_needed = 1;
jbe@0	1335 break;
jbe@0	1336 default:
jbe@0	1337 moonbr_log(LOG_CRIT, "Received illegal data (\"%c\") while reading control socket from child process in pool #%i with PID %i", (int)controlmsg, worker->pool->poolnum, (int)worker->pid);
jbe@0	1338 moonbr_terminate_error();
jbe@0	1339 }
jbe@0	1340 }
jbe@0	1341
jbe@0	1342 /* Handles stderr stream from child process */
jbe@0	1343 static void moonbr_read_errorchannel(struct moonbr_worker *worker) {
jbe@0	1344 char staticbuf[MOONBR_MAXERRORLINELEN+1];
jbe@0	1345 char *buf = worker->errorlinebuf;
jbe@0	1346 if (!buf) buf = staticbuf;
jbe@0	1347 {
jbe@0	1348 ssize_t bytes_read;
jbe@0	1349 while (
jbe@0	1350 (bytes_read = read(
jbe@0	1351 worker->errorfd,
jbe@0	1352 buf + worker->errorlinelen,
jbe@0	1353 MOONBR_MAXERRORLINELEN+1 - worker->errorlinelen
jbe@0	1354 )) <= 0
jbe@0	1355 ) {
jbe@0	1356 if (bytes_read == 0 \|\| errno == ECONNRESET) {
jbe@0	1357 if (moonbr_debug) {
jbe@0	1358 moonbr_log(LOG_DEBUG, "Child process in pool #%i with PID %i closed stderr socket", worker->pool->poolnum, (int)worker->pid);
jbe@0	1359 }
jbe@0	1360 if (close(worker->errorfd) && errno != EINTR) {
jbe@0	1361 moonbr_log(LOG_CRIT, "Error while closing stderr socket to child process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
jbe@0	1362 moonbr_terminate_error();
jbe@0	1363 }
jbe@0	1364 worker->errorfd = -1;
jbe@0	1365 moonbr_poll_refresh_needed = 1;
jbe@0	1366 break;
jbe@0	1367 }
jbe@0	1368 if (errno != EINTR) {
jbe@0	1369 moonbr_log(LOG_CRIT, "Unexpected error while reading stderr from child process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, strerror(errno));
jbe@0	1370 moonbr_terminate_error();
jbe@0	1371 }
jbe@0	1372 }
jbe@0	1373 worker->errorlinelen += bytes_read;
jbe@0	1374 }
jbe@0	1375 {
jbe@0	1376 int i;
jbe@0	1377 for (i=0; i<worker->errorlinelen; i++) {
jbe@0	1378 if (buf[i] == '\n') buf[i] = 0;
jbe@0	1379 if (!buf[i]) {
jbe@0	1380 if (worker->errorlineovf) {
jbe@0	1381 worker->errorlineovf = 0;
jbe@0	1382 } else {
jbe@0	1383 moonbr_log(LOG_WARNING, "Error log from process in pool #%i with PID %i: %s", worker->pool->poolnum, (int)worker->pid, buf);
jbe@0	1384 }
jbe@0	1385 worker->errorlinelen -= i+1;
jbe@0	1386 memmove(buf, buf+i+1, worker->errorlinelen);
jbe@0	1387 i = -1;
jbe@0	1388 }
jbe@0	1389 }
jbe@0	1390 if (i > MOONBR_MAXERRORLINELEN) {
jbe@0	1391 buf[MOONBR_MAXERRORLINELEN] = 0;
jbe@0	1392 if (!worker->errorlineovf) {
jbe@0	1393 moonbr_log(LOG_WARNING, "Error log from process in pool #%i with PID %i (line has been truncated): %s", worker->pool->poolnum, (int)worker->pid, buf);
jbe@0	1394 }
jbe@0	1395 worker->errorlinelen = 0;
jbe@0	1396 worker->errorlineovf = 1;
jbe@0	1397 }
jbe@0	1398 }
jbe@0	1399 if (!worker->errorlinebuf && worker->errorlinelen) { /* allocate buffer on heap only if necessary */
jbe@0	1400 worker->errorlinebuf = malloc((MOONBR_MAXERRORLINELEN+1) * sizeof(char));
jbe@0	1401 if (!worker->errorlinebuf) {
jbe@0	1402 moonbr_log(LOG_CRIT, "Memory allocation error");
jbe@0	1403 moonbr_terminate_error();
jbe@0	1404 }
jbe@0	1405 memcpy(worker->errorlinebuf, staticbuf, worker->errorlinelen);
jbe@0	1406 }
jbe@0	1407 }
jbe@0	1408
jbe@0	1409
jbe@0	1410 /* Handler for incoming connections */
jbe@0	1411
jbe@0	1412 /* Accepts one or more incoming connections on listener socket and passes it to worker(s) popped from idle queue */
jbe@0	1413 static void moonbr_connect(struct moonbr_pool *pool) {
jbe@0	1414 struct moonbr_listener *listener = moonbr_pop_connected_listener(pool);
jbe@0	1415 struct moonbr_worker *worker;
jbe@127	1416 if (listener->proto == MOONBR_PROTO_MAIN) {
jbe@127	1417 worker = moonbr_pop_idle_worker(pool);
jbe@127	1418 if (moonbr_stat) {
jbe@127	1419 moonbr_log(LOG_INFO, "Dispatching main thread of pool #%i to PID %i", listener->pool->poolnum, (int)worker->pid);
jbe@127	1420 }
jbe@127	1421 worker->main = 1;
jbe@127	1422 moonbr_send_control_message(worker, MOONBR_COMMAND_CONNECT, -1, listener);
jbe@127	1423 /* do not push listener to queue of idle listeners */
jbe@127	1424 } else if (listener->proto == MOONBR_PROTO_INTERVAL) {
jbe@0	1425 worker = moonbr_pop_idle_worker(pool);
jbe@0	1426 if (moonbr_stat) {
jbe@125	1427 moonbr_log(LOG_INFO, "Dispatching interval timer \"%s\" of pool #%i to PID %i", listener->type_specific.interval.name, listener->pool->poolnum, (int)worker->pid);
jbe@0	1428 }
jbe@0	1429 worker->restart_interval_listener = listener;
jbe@124	1430 moonbr_send_control_message(worker, MOONBR_COMMAND_CONNECT, -1, listener);
jbe@0	1431 /* do not push listener to queue of idle listeners yet */
jbe@125	1432 } else {
jbe@125	1433 int peerfd;
jbe@0	1434 do {
jbe@212	1435 /* peerfd = accept4(listener->listenfd, NULL, NULL, SOCK_CLOEXEC); */
jbe@212	1436 /* use accept() instead of accept4() to avoid _GNU_SOURCE on GNU/Linux */
jbe@212	1437 peerfd = accept(listener->listenfd, NULL, NULL);
jbe@212	1438 if (peerfd != -1) {
jbe@212	1439 if (fcntl(peerfd, F_SETFD, FD_CLOEXEC) == -1) {
jbe@212	1440 moonbr_log(LOG_ERR, "Error in fcntl() call: %s", strerror(errno));
jbe@212	1441 moonbr_terminate_error();
jbe@212	1442 }
jbe@212	1443 }
jbe@0	1444 if (peerfd == -1) {
jbe@0	1445 if (errno == EWOULDBLOCK) {
jbe@0	1446 break;
jbe@0	1447 } else if (errno == ECONNABORTED) {
jbe@125	1448 moonbr_log(LOG_WARNING, "Connection aborted before accepting it");
jbe@0	1449 break;
jbe@0	1450 } else if (errno != EINTR) {
jbe@0	1451 moonbr_log(LOG_ERR, "Could not accept socket connection: %s", strerror(errno));
jbe@0	1452 moonbr_terminate_error();
jbe@0	1453 }
jbe@0	1454 } else {
jbe@0	1455 worker = moonbr_pop_idle_worker(pool);
jbe@0	1456 if (moonbr_stat) {
jbe@125	1457 moonbr_log(LOG_INFO, "Dispatching connection for pool #%i to PID %i", listener->pool->poolnum, (int)worker->pid);
jbe@0	1458 }
jbe@124	1459 moonbr_send_control_message(worker, MOONBR_COMMAND_CONNECT, peerfd, listener);
jbe@0	1460 if (close(peerfd) && errno != EINTR) {
jbe@0	1461 moonbr_log(LOG_ERR, "Could not close incoming socket connection in parent process: %s", strerror(errno));
jbe@0	1462 moonbr_terminate_error();
jbe@0	1463 }
jbe@0	1464 }
jbe@0	1465 } while (pool->first_idle_worker);
jbe@0	1466 moonbr_add_idle_listener(listener);
jbe@0	1467 }
jbe@0	1468 }
jbe@0	1469
jbe@0	1470
jbe@0	1471 /* Functions to initialize and restart interval timers */
jbe@0	1472
jbe@0	1473 /* Initializes all interval timers */
jbe@0	1474 static void moonbr_interval_initialize() {
jbe@0	1475 struct timeval now;
jbe@0	1476 struct moonbr_pool *pool;
jbe@0	1477 moonbr_now(&now);
jbe@0	1478 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
jbe@0	1479 int i;
jbe@0	1480 for (i=0; i<pool->listener_count; i++) {
jbe@0	1481 struct moonbr_listener *listener = &pool->listener[i];
jbe@0	1482 if (listener->proto == MOONBR_PROTO_INTERVAL) {
jbe@0	1483 timeradd(
jbe@0	1484 &now,
jbe@125	1485 &listener->type_specific.interval.delay,
jbe@125	1486 &listener->type_specific.interval.wakeup
jbe@0	1487 );
jbe@0	1488 }
jbe@0	1489 }
jbe@0	1490 }
jbe@0	1491 }
jbe@0	1492
jbe@0	1493 /* If necessary, restarts interval timers and queues interval listener as idle after a worker changed status */
jbe@0	1494 static void moonbr_interval_restart(
jbe@0	1495 struct moonbr_worker *worker,
jbe@0	1496 struct timeval now / passed to synchronize with moonbr_run() function */
jbe@0	1497 ) {
jbe@0	1498 struct moonbr_listener *listener = worker->restart_interval_listener;
jbe@0	1499 if (listener) {
jbe@0	1500 moonbr_add_idle_listener(listener);
jbe@0	1501 worker->restart_interval_listener = NULL;
jbe@125	1502 if (listener->type_specific.interval.strict) {
jbe@0	1503 timeradd(
jbe@125	1504 &listener->type_specific.interval.wakeup,
jbe@125	1505 &listener->type_specific.interval.delay,
jbe@125	1506 &listener->type_specific.interval.wakeup
jbe@0	1507 );
jbe@125	1508 if (timercmp(&listener->type_specific.interval.wakeup, now, <)) {
jbe@125	1509 listener->type_specific.interval.wakeup = *now;
jbe@0	1510 }
jbe@0	1511 } else {
jbe@0	1512 timeradd(
jbe@0	1513 now,
jbe@125	1514 &listener->type_specific.interval.delay,
jbe@125	1515 &listener->type_specific.interval.wakeup
jbe@0	1516 );
jbe@0	1517 }
jbe@0	1518 }
jbe@0	1519 }
jbe@0	1520
jbe@0	1521
jbe@0	1522 /* Main loop and helper functions */
jbe@0	1523
jbe@0	1524 /* Stores the earliest required wakeup time in 'wait' variable */
jbe@0	1525 static void moonbr_calc_wait(struct timeval wait, struct timeval wakeup) {
jbe@0	1526 if (!timerisset(wait) \|\| timercmp(wakeup, wait, <)) wait = wakeup;
jbe@0	1527 }
jbe@0	1528
jbe@0	1529 /* Main loop of Moonbridge system (including initialization of signal handlers and polling structures) */
jbe@0	1530 static void moonbr_run(lua_State *L) {
jbe@0	1531 struct timeval now;
jbe@0	1532 struct moonbr_pool *pool;
jbe@0	1533 struct moonbr_worker *worker;
jbe@0	1534 struct moonbr_worker next_worker; / needed when worker is removed during iteration of workers */
jbe@0	1535 struct moonbr_listener *listener;
jbe@0	1536 struct moonbr_listener next_listener; / needed when listener is removed during iteration of listeners */
jbe@0	1537 int i;
jbe@0	1538 moonbr_poll_init(); /* must be executed before moonbr_signal_init() */
jbe@0	1539 moonbr_signal_init();
jbe@0	1540 moonbr_interval_initialize();
jbe@0	1541 moonbr_pstate = MOONBR_PSTATE_RUNNING;
jbe@0	1542 while (1) {
jbe@0	1543 struct timeval wait = {0, }; /* point in time when premature wakeup of poll() is required */
jbe@0	1544 if (moonbr_cond_interrupt) {
jbe@0	1545 moonbr_log(LOG_WARNING, "Fast shutdown requested");
jbe@0	1546 moonbr_terminate(MOONBR_EXITCODE_GRACEFUL);
jbe@0	1547 }
jbe@0	1548 if (moonbr_cond_terminate) {
jbe@0	1549 moonbr_initiate_shutdown();
jbe@0	1550 moonbr_cond_terminate = 0;
jbe@0	1551 }
jbe@0	1552 moonbr_cond_child = 0; /* must not be reset between moonbr_try_destroy_worker() and poll() */
jbe@0	1553 moonbr_now(&now);
jbe@0	1554 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
jbe@0	1555 int terminated_worker_count = 0; /* allows shortcut for new worker creation */
jbe@0	1556 /* terminate idle workers when expired */
jbe@0	1557 if (timerisset(&pool->idle_timeout)) {
jbe@0	1558 while ((worker = pool->first_idle_worker) != NULL) {
jbe@0	1559 if (timercmp(&worker->idle_expiration, &now, >)) break;
jbe@0	1560 moonbr_pop_idle_worker(pool);
jbe@0	1561 moonbr_terminate_idle_worker(worker);
jbe@0	1562 }
jbe@0	1563 }
jbe@0	1564 /* mark listeners as connected when incoming connection is pending */
jbe@0	1565 for (listener=pool->first_idle_listener; listener; listener=next_listener) {
jbe@0	1566 next_listener = listener->next_listener; /* extra variable necessary due to changing list */
jbe@0	1567 if (listener->pollidx != -1) {
jbe@0	1568 if (moonbr_poll_fds[listener->pollidx].revents) {
jbe@0	1569 moonbr_poll_fds[listener->pollidx].revents = 0;
jbe@0	1570 moonbr_remove_idle_listener(listener);
jbe@0	1571 moonbr_add_connected_listener(listener);
jbe@0	1572 }
jbe@127	1573 } else if (
jbe@127	1574 listener->proto != MOONBR_PROTO_INTERVAL \|\|
jbe@127	1575 !timercmp(&listener->type_specific.interval.wakeup, &now, >)
jbe@127	1576 ) {
jbe@127	1577 moonbr_remove_idle_listener(listener);
jbe@127	1578 moonbr_add_connected_listener(listener);
jbe@0	1579 }
jbe@0	1580 }
jbe@0	1581 /* process input from child processes */
jbe@0	1582 for (i=0; i<moonbr_poll_worker_count; i++) {
jbe@0	1583 if (moonbr_poll_worker_fds[i].revents) {
jbe@0	1584 moonbr_poll_worker_fds[i].revents = 0;
jbe@0	1585 struct moonbr_poll_worker *poll_worker = &moonbr_poll_workers[i];
jbe@0	1586 switch (poll_worker->channel) {
jbe@0	1587 case MOONBR_POLL_WORKER_CONTROLCHANNEL:
jbe@0	1588 moonbr_read_controlchannel(poll_worker->worker);
jbe@0	1589 moonbr_interval_restart(poll_worker->worker, &now);
jbe@0	1590 break;
jbe@0	1591 case MOONBR_POLL_WORKER_ERRORCHANNEL:
jbe@0	1592 moonbr_read_errorchannel(poll_worker->worker);
jbe@0	1593 break;
jbe@0	1594 }
jbe@0	1595 }
jbe@0	1596 }
jbe@0	1597 /* collect dead child processes */
jbe@0	1598 for (worker=pool->first_worker; worker; worker=next_worker) {
jbe@0	1599 next_worker = worker->next_worker; /* extra variable necessary due to changing list */
jbe@0	1600 switch (moonbr_try_destroy_worker(worker)) {
jbe@0	1601 case MOONBR_DESTROY_PREPARE:
jbe@0	1602 pool->use_fork_error_wakeup = 1;
jbe@0	1603 break;
jbe@0	1604 case MOONBR_DESTROY_IDLE_OR_ASSIGNED:
jbe@0	1605 terminated_worker_count++;
jbe@0	1606 break;
jbe@0	1607 }
jbe@0	1608 }
jbe@0	1609 if (!moonbr_shutdown_in_progress) {
jbe@130	1610 /* connect listeners with idle workers */
jbe@0	1611 while (pool->first_connected_listener && pool->first_idle_worker) {
jbe@0	1612 moonbr_connect(pool);
jbe@0	1613 }
jbe@130	1614 /* create new worker processes */
jbe@130	1615 while (
jbe@130	1616 pool->total_worker_count < pool->max_fork && (
jbe@130	1617 pool->unassigned_worker_count < pool->pre_fork \|\|
jbe@130	1618 pool->total_worker_count < pool->min_fork
jbe@130	1619 )
jbe@130	1620 ) {
jbe@130	1621 if (pool->use_fork_error_wakeup) {
jbe@130	1622 if (timercmp(&pool->fork_error_wakeup, &now, >)) {
jbe@130	1623 moonbr_calc_wait(&wait, &pool->fork_error_wakeup);
jbe@130	1624 break;
jbe@130	1625 }
jbe@130	1626 } else {
jbe@130	1627 if (terminated_worker_count) {
jbe@130	1628 terminated_worker_count--;
jbe@130	1629 } else if (timercmp(&pool->fork_wakeup, &now, >)) {
jbe@130	1630 moonbr_calc_wait(&wait, &pool->fork_wakeup);
jbe@130	1631 break;
jbe@130	1632 }
jbe@0	1633 }
jbe@130	1634 if (moonbr_create_worker(pool, L)) {
jbe@130	1635 /* on error, enforce error delay */
jbe@130	1636 timeradd(&now, &pool->fork_error_delay, &pool->fork_error_wakeup);
jbe@130	1637 pool->use_fork_error_wakeup = 1;
jbe@130	1638 moonbr_calc_wait(&wait, &pool->fork_error_wakeup);
jbe@130	1639 break;
jbe@130	1640 } else {
jbe@130	1641 /* normal fork delay on success */
jbe@130	1642 timeradd(&now, &pool->fork_delay, &pool->fork_wakeup);
jbe@130	1643 timeradd(&now, &pool->fork_error_delay, &pool->fork_error_wakeup);
jbe@130	1644 pool->use_fork_error_wakeup = 0; /* gets set later if error occures during preparation */
jbe@130	1645 }
jbe@130	1646 }
jbe@130	1647 /* terminate excessive worker processes */
jbe@130	1648 while (
jbe@130	1649 pool->total_worker_count > pool->min_fork &&
jbe@130	1650 pool->idle_worker_count > pool->pre_fork
jbe@130	1651 ) {
jbe@130	1652 if (timerisset(&pool->exit_wakeup)) {
jbe@130	1653 if (timercmp(&pool->exit_wakeup, &now, >)) {
jbe@130	1654 moonbr_calc_wait(&wait, &pool->exit_wakeup);
jbe@130	1655 break;
jbe@130	1656 }
jbe@130	1657 moonbr_terminate_idle_worker(moonbr_pop_idle_worker(pool));
jbe@130	1658 timeradd(&now, &pool->exit_delay, &pool->exit_wakeup);
jbe@130	1659 } else {
jbe@130	1660 timeradd(&now, &pool->exit_delay, &pool->exit_wakeup);
jbe@0	1661 break;
jbe@0	1662 }
jbe@0	1663 }
jbe@130	1664 if (!(
jbe@130	1665 pool->total_worker_count > pool->min_fork &&
jbe@130	1666 pool->idle_worker_count > pool->pre_fork
jbe@130	1667 )) {
jbe@130	1668 timerclear(&pool->exit_wakeup); /* timer gets restarted later when there are excessive workers */
jbe@0	1669 }
jbe@0	1670 }
jbe@0	1671 /* optionally output worker count stats */
jbe@0	1672 if (moonbr_stat && pool->worker_count_stat) {
jbe@0	1673 pool->worker_count_stat = 0;
jbe@0	1674 moonbr_log(
jbe@0	1675 LOG_INFO,
jbe@0	1676 "Worker count for pool #%i: %i idle, %i assigned, %i total",
jbe@0	1677 pool->poolnum, pool->idle_worker_count,
jbe@0	1678 pool->total_worker_count - pool->unassigned_worker_count,
jbe@0	1679 pool->total_worker_count);
jbe@0	1680 }
jbe@0	1681 /* calculate wakeup time for interval listeners */
jbe@0	1682 for (listener=pool->first_idle_listener; listener; listener=listener->next_listener) {
jbe@0	1683 if (listener->proto == MOONBR_PROTO_INTERVAL) {
jbe@125	1684 moonbr_calc_wait(&wait, &listener->type_specific.interval.wakeup);
jbe@0	1685 }
jbe@0	1686 }
jbe@0	1687 /* calculate wakeup time for idle workers (only first idle worker is significant) */
jbe@0	1688 if (timerisset(&pool->idle_timeout) && pool->first_idle_worker) {
jbe@0	1689 moonbr_calc_wait(&wait, &pool->first_idle_worker->idle_expiration);
jbe@0	1690 }
jbe@0	1691 }
jbe@130	1692 /* terminate idle workers in case of shutdown and check if shutdown is complete */
jbe@0	1693 if (moonbr_shutdown_in_progress) {
jbe@195	1694 int remaining = 0;
jbe@0	1695 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
jbe@195	1696 while (pool->idle_worker_count) {
jbe@195	1697 moonbr_terminate_idle_worker(moonbr_pop_idle_worker(pool));
jbe@130	1698 }
jbe@195	1699 if (pool->first_worker) remaining = 1;
jbe@0	1700 }
jbe@195	1701 if (!remaining) {
jbe@0	1702 moonbr_log(LOG_INFO, "All worker threads have terminated");
jbe@0	1703 moonbr_terminate(MOONBR_EXITCODE_GRACEFUL);
jbe@0	1704 }
jbe@0	1705 }
jbe@0	1706 if (moonbr_poll_refresh_needed) moonbr_poll_refresh();
jbe@0	1707 moonbr_cond_poll = 1;
jbe@0	1708 if (!moonbr_cond_child && !moonbr_cond_terminate && !moonbr_cond_interrupt) {
jbe@0	1709 int timeout;
jbe@0	1710 if (timerisset(&wait)) {
jbe@0	1711 if (timercmp(&wait, &now, <)) {
jbe@0	1712 moonbr_log(LOG_CRIT, "Internal error (should not happen): Future is in the past");
jbe@0	1713 moonbr_terminate_error();
jbe@0	1714 }
jbe@0	1715 timersub(&wait, &now, &wait);
jbe@0	1716 timeout = wait.tv_sec * 1000 + wait.tv_usec / 1000;
jbe@0	1717 } else {
jbe@0	1718 timeout = INFTIM;
jbe@0	1719 }
jbe@0	1720 if (moonbr_debug) {
jbe@0	1721 moonbr_log(LOG_DEBUG, "Waiting for I/O");
jbe@0	1722 }
jbe@0	1723 poll(moonbr_poll_fds, moonbr_poll_fds_count, timeout);
jbe@0	1724 } else {
jbe@0	1725 if (moonbr_debug) {
jbe@0	1726 moonbr_log(LOG_DEBUG, "Do not wait for I/O");
jbe@0	1727 }
jbe@0	1728 }
jbe@0	1729 moonbr_cond_poll = 0;
jbe@0	1730 moonbr_poll_reset_signal();
jbe@0	1731 }
jbe@0	1732 }
jbe@0	1733
jbe@0	1734
jbe@0	1735 /* Lua interface */
jbe@0	1736
jbe@0	1737 static int moonbr_lua_panic(lua_State *L) {
jbe@0	1738 const char *errmsg;
jbe@0	1739 errmsg = lua_tostring(L, -1);
jbe@0	1740 if (!errmsg) {
jbe@0	1741 if (lua_isnoneornil(L, -1)) errmsg = "(error message is nil)";
jbe@0	1742 else errmsg = "(error message is not a string)";
jbe@0	1743 }
jbe@0	1744 if (moonbr_pstate == MOONBR_PSTATE_FORKED) {
jbe@0	1745 fprintf(stderr, "Uncaught Lua error: %s\n", errmsg);
jbe@0	1746 exit(1);
jbe@0	1747 } else {
jbe@0	1748 moonbr_log(LOG_CRIT, "Uncaught Lua error: %s", errmsg);
jbe@0	1749 moonbr_terminate_error();
jbe@0	1750 }
jbe@0	1751 return 0;
jbe@0	1752 }
jbe@0	1753
jbe@0	1754 static int moonbr_addtraceback(lua_State *L) {
jbe@0	1755 luaL_traceback(L, L, luaL_tolstring(L, 1, NULL), 1);
jbe@0	1756 return 1;
jbe@0	1757 }
jbe@0	1758
jbe@0	1759 /* Memory allocator that allows limiting memory consumption */
jbe@0	1760 static void moonbr_alloc (void ud, void *ptr, size_t osize, size_t nsize) {
jbe@0	1761 (void)ud; /* not used */
jbe@0	1762 if (nsize == 0) {
jbe@0	1763 if (ptr) {
jbe@0	1764 moonbr_memory_usage -= osize;
jbe@0	1765 free(ptr);
jbe@0	1766 }
jbe@0	1767 return NULL;
jbe@0	1768 } else if (ptr) {
jbe@0	1769 if (
jbe@0	1770 moonbr_memory_limit &&
jbe@0	1771 nsize > osize &&
jbe@0	1772 moonbr_memory_usage + (nsize - osize) > moonbr_memory_limit
jbe@0	1773 ) {
jbe@0	1774 return NULL;
jbe@0	1775 } else {
jbe@0	1776 ptr = realloc(ptr, nsize);
jbe@0	1777 if (ptr) moonbr_memory_usage += nsize - osize;
jbe@0	1778 }
jbe@0	1779 } else {
jbe@0	1780 if (
jbe@0	1781 moonbr_memory_limit &&
jbe@0	1782 moonbr_memory_usage + nsize > moonbr_memory_limit
jbe@0	1783 ) {
jbe@0	1784 return NULL;
jbe@0	1785 } else {
jbe@0	1786 ptr = realloc(ptr, nsize);
jbe@0	1787 if (ptr) moonbr_memory_usage += nsize;
jbe@0	1788 }
jbe@0	1789 }
jbe@0	1790 return ptr;
jbe@0	1791 }
jbe@0	1792
jbe@66	1793 static int moonbr_lua_tonatural(lua_State *L, int idx) {
jbe@66	1794 int isnum;
jbe@66	1795 lua_Number n;
jbe@66	1796 n = lua_tonumberx(L, idx, &isnum);
jbe@66	1797 if (isnum && n>=0 && n<INT_MAX && (lua_Number)(int)n == n) return n;
jbe@66	1798 else return -1;
jbe@66	1799 }
jbe@66	1800
jbe@66	1801 static int moonbr_lua_totimeval(lua_State L, int idx, struct timeval value) {
jbe@66	1802 int isnum;
jbe@66	1803 lua_Number n;
jbe@66	1804 n = lua_tonumberx(L, idx, &isnum);
jbe@66	1805 if (isnum && n>=0 && n<=100000000) {
jbe@66	1806 value->tv_sec = n;
jbe@66	1807 value->tv_usec = 1e6 * (n - value->tv_sec);
jbe@66	1808 return 1;
jbe@66	1809 } else {
jbe@66	1810 return 0;
jbe@66	1811 }
jbe@66	1812 }
jbe@66	1813
jbe@0	1814 static int moonbr_timeout(lua_State *L) {
jbe@0	1815 struct itimerval oldval;
jbe@0	1816 if (lua_isnoneornil(L, 1) && lua_isnoneornil(L, 2)) {
jbe@0	1817 getitimer(ITIMER_REAL, &oldval);
jbe@0	1818 } else {
jbe@0	1819 struct itimerval newval = {};
jbe@39	1820 timerclear(&newval.it_interval);
jbe@39	1821 timerclear(&newval.it_value);
jbe@0	1822 if (lua_toboolean(L, 1)) {
jbe@0	1823 luaL_argcheck(
jbe@0	1824 L, moonbr_lua_totimeval(L, 1, &newval.it_value), 1,
jbe@0	1825 "interval in seconds expected"
jbe@0	1826 );
jbe@0	1827 }
jbe@0	1828 if (lua_isnoneornil(L, 2)) {
jbe@0	1829 if (setitimer(ITIMER_REAL, &newval, &oldval)) {
jbe@0	1830 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
jbe@0	1831 moonbr_terminate_error();
jbe@0	1832 }
jbe@0	1833 } else {
jbe@0	1834 getitimer(ITIMER_REAL, &oldval);
jbe@39	1835 if (!timerisset(&oldval.it_value)) {
jbe@39	1836 if (setitimer(ITIMER_REAL, &newval, NULL)) {
jbe@39	1837 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
jbe@39	1838 moonbr_terminate_error();
jbe@39	1839 }
jbe@39	1840 lua_call(L, lua_gettop(L) - 2, LUA_MULTRET);
jbe@39	1841 timerclear(&newval.it_value);
jbe@39	1842 if (setitimer(ITIMER_REAL, &newval, NULL)) {
jbe@39	1843 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
jbe@39	1844 moonbr_terminate_error();
jbe@39	1845 }
jbe@39	1846 } else if (timercmp(&newval.it_value, &oldval.it_value, <)) {
jbe@0	1847 struct itimerval remval;
jbe@0	1848 if (setitimer(ITIMER_REAL, &newval, NULL)) {
jbe@0	1849 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
jbe@0	1850 moonbr_terminate_error();
jbe@0	1851 }
jbe@0	1852 lua_call(L, lua_gettop(L) - 2, LUA_MULTRET);
jbe@0	1853 getitimer(ITIMER_REAL, &remval);
jbe@0	1854 timersub(&oldval.it_value, &newval.it_value, &newval.it_value);
jbe@0	1855 timeradd(&newval.it_value, &remval.it_value, &newval.it_value);
jbe@0	1856 if (setitimer(ITIMER_REAL, &newval, NULL)) {
jbe@0	1857 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
jbe@0	1858 moonbr_terminate_error();
jbe@0	1859 }
jbe@0	1860 } else {
jbe@0	1861 lua_call(L, lua_gettop(L) - 2, LUA_MULTRET);
jbe@0	1862 }
jbe@0	1863 return lua_gettop(L) - 1;
jbe@0	1864 }
jbe@0	1865 }
jbe@115	1866 lua_pushnumber(L, oldval.it_value.tv_sec + 1e-6 * oldval.it_value.tv_usec);
jbe@0	1867 return 1;
jbe@0	1868 }
jbe@0	1869
jbe@0	1870 #define moonbr_listen_init_pool_forkoption(luaname, cname, defval) { \
jbe@0	1871 lua_getfield(L, 2, luaname); \
jbe@0	1872 pool->cname = lua_isnil(L, -1) ? (defval) : moonbr_lua_tonatural(L, -1); \
jbe@0	1873 } while(0)
jbe@0	1874
jbe@0	1875 #define moonbr_listen_init_pool_timeoption(luaname, cname, defval, defvalu) ( \
jbe@0	1876 lua_getfield(L, 2, luaname), \
jbe@0	1877 lua_isnil(L, -1) ? ( \
jbe@0	1878 pool->cname.tv_sec = (defval), pool->cname.tv_usec = (defvalu), \
jbe@0	1879 1 \
jbe@0	1880 ) : ( \
jbe@0	1881 (lua_isboolean(L, -1) && !lua_toboolean(L, -1)) ? ( \
jbe@0	1882 pool->cname.tv_sec = 0, pool->cname.tv_usec = 0, \
jbe@0	1883 1 \
jbe@0	1884 ) : ( \
jbe@0	1885 moonbr_lua_totimeval(L, -1, &pool->cname) \
jbe@0	1886 ) \
jbe@0	1887 ) \
jbe@0	1888 )
jbe@0	1889
jbe@0	1890 static int moonbr_listen_init_pool(lua_State *L) {
jbe@0	1891 struct moonbr_pool *pool;
jbe@0	1892 const char *proto;
jbe@0	1893 int i;
jbe@127	1894 int dynamic = 0; /* nonzero = listeners exist which require dynamic worker creation */
jbe@0	1895 pool = lua_touserdata(L, 1);
jbe@0	1896 for (i=0; i<pool->listener_count; i++) {
jbe@0	1897 struct moonbr_listener *listener = &pool->listener[i];
jbe@0	1898 lua_settop(L, 2);
jbe@3	1899 #if LUA_VERSION_NUM >= 503
jbe@3	1900 lua_geti(L, 2, i+1);
jbe@3	1901 #else
jbe@0	1902 lua_pushinteger(L, i+1);
jbe@0	1903 lua_gettable(L, 2);
jbe@3	1904 #endif
jbe@0	1905 lua_getfield(L, 3, "proto");
jbe@0	1906 proto = lua_tostring(L, -1);
jbe@127	1907 if (proto && !strcmp(proto, "main")) {
jbe@127	1908 listener->proto = MOONBR_PROTO_MAIN;
jbe@127	1909 } else if (proto && !strcmp(proto, "interval")) {
jbe@127	1910 dynamic = 1;
jbe@0	1911 listener->proto = MOONBR_PROTO_INTERVAL;
jbe@0	1912 lua_getfield(L, 3, "name");
jbe@0	1913 {
jbe@0	1914 const char *name = lua_tostring(L, -1);
jbe@0	1915 if (name) {
jbe@211	1916 char *name_dup = strdup(name);
jbe@211	1917 if (!name_dup) {
jbe@0	1918 moonbr_log(LOG_CRIT, "Memory allocation_error");
jbe@0	1919 moonbr_terminate_error();
jbe@0	1920 }
jbe@211	1921 listener->type_specific.interval.name = name_dup;
jbe@0	1922 }
jbe@0	1923 }
jbe@0	1924 lua_getfield(L, 3, "delay");
jbe@0	1925 if (
jbe@125	1926 !moonbr_lua_totimeval(L, -1, &listener->type_specific.interval.delay) \|\|
jbe@125	1927 !timerisset(&listener->type_specific.interval.delay)
jbe@0	1928 ) {
jbe@0	1929 luaL_error(L, "No valid interval delay specified; use listen{{proto=\"interval\", delay=...}, ...}");
jbe@0	1930 }
jbe@0	1931 lua_getfield(L, 3, "strict");
jbe@0	1932 if (!lua_isnil(L, -1)) {
jbe@0	1933 if (lua_isboolean(L, -1)) {
jbe@125	1934 if (lua_toboolean(L, -1)) listener->type_specific.interval.strict = 1;
jbe@0	1935 } else {
jbe@0	1936 luaL_error(L, "Option \"strict\" must be a boolean if set; use listen{{proto=\"interval\", strict=true, ...}, ...}");
jbe@0	1937 }
jbe@0	1938 }
jbe@0	1939 } else if (proto && !strcmp(proto, "local")) {
jbe@125	1940 const char *path;
jbe@125	1941 const int path_maxlen = (
jbe@125	1942 sizeof(listener->type_specific.socket.addr.addr_un) -
jbe@125	1943 ((void )listener->type_specific.socket.addr.addr_un.sun_path - (void )&listener->type_specific.socket.addr.addr_un)
jbe@125	1944 ) - 1; /* one byte for termination */
jbe@127	1945 dynamic = 1;
jbe@0	1946 listener->proto = MOONBR_PROTO_LOCAL;
jbe@0	1947 lua_getfield(L, 3, "path");
jbe@125	1948 path = lua_tostring(L, -1);
jbe@125	1949 if (!path) {
jbe@125	1950 luaL_error(L, "No valid path specified for local socket; use listen{{proto=\"local\", path=...}, ...}");
jbe@125	1951 }
jbe@125	1952 if (strlen(path) > path_maxlen) {
jbe@125	1953 luaL_error(L, "Path name for local socket exceeded maximum length of %i characters", path_maxlen);
jbe@125	1954 }
jbe@125	1955 strcpy(listener->type_specific.socket.addr.addr_un.sun_path, path);
jbe@125	1956 } else if (proto && !strcmp(proto, "tcp")) {
jbe@125	1957 const char host, port;
jbe@125	1958 struct addrinfo hints = { 0, };
jbe@125	1959 struct addrinfo res, addrinfo;
jbe@125	1960 int errcode;
jbe@125	1961 const char *ip;
jbe@127	1962 dynamic = 1;
jbe@125	1963 lua_getfield(L, 3, "host");
jbe@125	1964 host = lua_isnil(L, -1) ? "::" : lua_tostring(L, -1);
jbe@125	1965 if (!host) {
jbe@125	1966 luaL_error(L, "No host specified; use listen{{proto=\"tcp\", host=...}, ...}");
jbe@125	1967 }
jbe@125	1968 lua_getfield(L, 3, "port");
jbe@125	1969 port = lua_tostring(L, -1);
jbe@125	1970 if (!port) {
jbe@125	1971 luaL_error(L, "No port specified; use listen{{proto=\"tcp\", host=...}, ...}");
jbe@125	1972 }
jbe@125	1973 hints.ai_family = AF_UNSPEC;
jbe@125	1974 hints.ai_socktype = SOCK_STREAM;
jbe@125	1975 hints.ai_protocol = IPPROTO_TCP;
jbe@125	1976 hints.ai_flags = AI_ADDRCONFIG \| AI_PASSIVE;
jbe@125	1977 errcode = getaddrinfo(host, port, &hints, &res);
jbe@125	1978 if (errcode) {
jbe@125	1979 freeaddrinfo(res);
jbe@125	1980 if (errcode == EAI_SYSTEM) {
jbe@125	1981 char errmsg[MOONBR_MAXSTRERRORLEN];
jbe@125	1982 strerror_r(errno, errmsg, MOONBR_MAXSTRERRORLEN); /* use thread-safe call in case child created threads */
jbe@125	1983 luaL_error(L, "Could not resolve host: %s: %s", gai_strerror(errcode), errmsg);
jbe@125	1984 } else {
jbe@125	1985 luaL_error(L, "Could not resolve host: %s", gai_strerror(errcode));
jbe@0	1986 }
jbe@0	1987 }
jbe@125	1988 for (addrinfo=res; addrinfo; addrinfo=addrinfo->ai_next) {
jbe@125	1989 if (addrinfo->ai_family == AF_INET6) goto moonbr_listen_init_pool_found;
jbe@125	1990 }
jbe@125	1991 for (addrinfo=res; addrinfo; addrinfo=addrinfo->ai_next) {
jbe@125	1992 if (addrinfo->ai_family == AF_INET) goto moonbr_listen_init_pool_found;
jbe@0	1993 }
jbe@125	1994 addrinfo = res;
jbe@125	1995 moonbr_listen_init_pool_found:
jbe@125	1996 if (addrinfo->ai_addrlen > sizeof(listener->type_specific.socket.addr)) {
jbe@125	1997 moonbr_log(LOG_CRIT, "Size of ai_addrlen is unexpectedly big (should not happen)");
jbe@125	1998 moonbr_terminate_error();
jbe@0	1999 }
jbe@125	2000 memcpy(&listener->type_specific.socket.addr, addrinfo->ai_addr, addrinfo->ai_addrlen);
jbe@125	2001 listener->type_specific.socket.addrlen = addrinfo->ai_addrlen;
jbe@125	2002 switch (addrinfo->ai_family) {
jbe@125	2003 case AF_INET6:
jbe@125	2004 ip = inet_ntop(
jbe@125	2005 addrinfo->ai_family,
jbe@125	2006 &((struct sockaddr_in6 *)addrinfo->ai_addr)->sin6_addr,
jbe@125	2007 listener->proto_specific.tcp.ip,
jbe@125	2008 INET6_ADDRSTRLEN
jbe@125	2009 );
jbe@125	2010 if (!ip) {
jbe@125	2011 moonbr_log(LOG_CRIT, "System error in inet_ntop call: %s", strerror(errno));
jbe@125	2012 moonbr_terminate_error();
jbe@125	2013 }
jbe@125	2014 listener->proto_specific.tcp.port = ntohs(((struct sockaddr_in6 *)addrinfo->ai_addr)->sin6_port);
jbe@125	2015 break;
jbe@125	2016 case AF_INET:
jbe@125	2017 ip = inet_ntop(
jbe@125	2018 addrinfo->ai_family,
jbe@125	2019 &((struct sockaddr_in *)addrinfo->ai_addr)->sin_addr,
jbe@125	2020 listener->proto_specific.tcp.ip,
jbe@125	2021 INET6_ADDRSTRLEN
jbe@125	2022 );
jbe@125	2023 if (!ip) {
jbe@125	2024 moonbr_log(LOG_CRIT, "System error in inet_ntop call: %s", strerror(errno));
jbe@125	2025 moonbr_terminate_error();
jbe@125	2026 }
jbe@125	2027 listener->proto_specific.tcp.port = ntohs(((struct sockaddr_in *)addrinfo->ai_addr)->sin_port);
jbe@125	2028 break;
jbe@125	2029 default:
jbe@125	2030 strcpy(listener->proto_specific.tcp.ip, "unknown");
jbe@125	2031 listener->proto_specific.tcp.port = 0;
jbe@0	2032 }
jbe@125	2033 listener->proto = MOONBR_PROTO_TCP;
jbe@125	2034 } else if (proto) {
jbe@125	2035 luaL_error(L, "Unknown protocol \"%s\"", proto);
jbe@125	2036 } else {
jbe@125	2037 luaL_error(L, "No valid protocol specified; use listen{{proto=..., ...}, ...}");
jbe@0	2038 }
jbe@0	2039 }
jbe@0	2040 lua_settop(L, 2);
jbe@127	2041 if (dynamic) {
jbe@127	2042 moonbr_listen_init_pool_forkoption("pre_fork", pre_fork, 1);
jbe@127	2043 moonbr_listen_init_pool_forkoption("min_fork", min_fork, pool->pre_fork > 2 ? pool->pre_fork : 2);
jbe@127	2044 moonbr_listen_init_pool_forkoption("max_fork", max_fork, pool->min_fork > 16 ? pool->min_fork : 16);
jbe@127	2045 if (!moonbr_listen_init_pool_timeoption("fork_delay", fork_delay, 0, 250000)) {
jbe@127	2046 luaL_error(L, "Option \"fork_delay\" is expected to be a non-negative number");
jbe@127	2047 }
jbe@127	2048 if (!moonbr_listen_init_pool_timeoption("fork_error_delay", fork_error_delay, 2, 0)) {
jbe@127	2049 luaL_error(L, "Option \"fork_error_delay\" is expected to be a non-negative number");
jbe@127	2050 }
jbe@127	2051 if (!moonbr_listen_init_pool_timeoption("exit_delay", exit_delay, 60, 0)) {
jbe@127	2052 luaL_error(L, "Option \"exit_delay\" is expected to be a non-negative number");
jbe@127	2053 }
jbe@127	2054 if (timercmp(&pool->fork_error_delay, &pool->fork_delay, <)) {
jbe@127	2055 pool->fork_error_delay = pool->fork_delay;
jbe@127	2056 }
jbe@127	2057 if (!moonbr_listen_init_pool_timeoption("idle_timeout", idle_timeout, 0, 0)) {
jbe@127	2058 luaL_error(L, "Option \"idle_timeout\" is expected to be a non-negative number");
jbe@127	2059 }
jbe@127	2060 } else {
jbe@127	2061 pool->pre_fork = 0;
jbe@127	2062 pool->min_fork = pool->listener_count;
jbe@127	2063 pool->max_fork = pool->listener_count;
jbe@0	2064 }
jbe@0	2065 lua_getfield(L, 2, "memory_limit");
jbe@0	2066 if (!lua_isnil(L, -1)) {
jbe@0	2067 int isnum;
jbe@0	2068 lua_Number n;
jbe@0	2069 n = lua_tonumberx(L, -1, &isnum);
jbe@0	2070 if (n < 0 \|\| !isnum) {
jbe@0	2071 luaL_error(L, "Option \"memory_limit\" is expected to be a non-negative number");
jbe@0	2072 }
jbe@0	2073 pool->memory_limit = n;
jbe@0	2074 }
jbe@0	2075 lua_settop(L, 2);
jbe@0	2076 lua_getfield(L, 2, "prepare");
jbe@0	2077 if (!lua_isnil(L, -1) && !lua_isfunction(L, -1)) {
jbe@0	2078 luaL_error(L, "Option \"prepare\" must be nil or a function");
jbe@0	2079 }
jbe@0	2080 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_prepare_func(pool));
jbe@0	2081 lua_getfield(L, 2, "connect");
jbe@0	2082 if (!lua_isfunction(L, -1)) {
jbe@0	2083 luaL_error(L, "Option \"connect\" must be a function; use listen{{...}, {...}, connect=function(socket) ... end, ...}");
jbe@0	2084 }
jbe@0	2085 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_connect_func(pool));
jbe@0	2086 lua_getfield(L, 2, "finish");
jbe@0	2087 if (!lua_isnil(L, -1) && !lua_isfunction(L, -1)) {
jbe@0	2088 luaL_error(L, "Option \"finish\" must be nil or a function");
jbe@0	2089 }
jbe@0	2090 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_finish_func(pool));
jbe@0	2091 return 0;
jbe@0	2092 }
jbe@0	2093
jbe@0	2094 static int moonbr_listen(lua_State *L) {
jbe@0	2095 struct moonbr_pool *pool;
jbe@0	2096 lua_Integer listener_count;
jbe@0	2097 if (moonbr_booted) luaL_error(L, "Moonbridge bootup is already complete");
jbe@0	2098 luaL_checktype(L, 1, LUA_TTABLE);
jbe@0	2099 listener_count = luaL_len(L, 1);
jbe@0	2100 if (!listener_count) luaL_error(L, "No listen ports specified; use listen{{proto=..., port=...},...}");
jbe@0	2101 if (listener_count > 100) luaL_error(L, "Too many listeners");
jbe@0	2102 pool = moonbr_create_pool(listener_count);
jbe@0	2103 lua_pushcfunction(L, moonbr_listen_init_pool);
jbe@0	2104 lua_pushlightuserdata(L, pool);
jbe@0	2105 lua_pushvalue(L, 1);
jbe@0	2106 if (lua_pcall(L, 2, 0, 0)) goto moonbr_listen_error;
jbe@0	2107 {
jbe@0	2108 int i;
jbe@0	2109 i = moonbr_start_pool(pool);
jbe@0	2110 if (i >= 0) {
jbe@125	2111 lua_pushfstring(L, "Could not initialize listener #%d: %s", i+1, strerror(errno));
jbe@125	2112 moonbr_listen_error:
jbe@125	2113 moonbr_destroy_pool(pool);
jbe@125	2114 lua_pushnil(L);
jbe@125	2115 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_prepare_func(pool));
jbe@125	2116 lua_pushnil(L);
jbe@125	2117 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_connect_func(pool));
jbe@125	2118 lua_pushnil(L);
jbe@125	2119 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_finish_func(pool));
jbe@125	2120 lua_error(L);
jbe@0	2121 }
jbe@0	2122 }
jbe@0	2123 return 0;
jbe@0	2124 }
jbe@0	2125
jbe@0	2126
jbe@9	2127 /* Function to modify Lua's library path and/or cpath */
jbe@9	2128
jbe@9	2129 #if defined(MOONBR_LUA_PATH) \|\| defined(MOONBR_LUA_CPATH)
jbe@9	2130 static void moonbr_modify_path(lua_State L, char key, char *value) {
jbe@9	2131 int stackbase;
jbe@9	2132 stackbase = lua_gettop(L);
jbe@9	2133 lua_getglobal(L, "package");
jbe@9	2134 lua_getfield(L, stackbase+1, key);
jbe@9	2135 {
jbe@9	2136 const char *current_str;
jbe@9	2137 size_t current_strlen;
jbe@9	2138 luaL_Buffer buf;
jbe@9	2139 current_str = lua_tolstring(L, stackbase+2, &current_strlen);
jbe@9	2140 luaL_buffinit(L, &buf);
jbe@9	2141 if (current_str) {
jbe@9	2142 lua_pushvalue(L, stackbase+2);
jbe@9	2143 luaL_addvalue(&buf);
jbe@9	2144 if (current_strlen && current_str[current_strlen-1] != ';') {
jbe@9	2145 luaL_addchar(&buf, ';');
jbe@9	2146 }
jbe@9	2147 }
jbe@9	2148 luaL_addstring(&buf, value);
jbe@9	2149 luaL_pushresult(&buf);
jbe@9	2150 }
jbe@9	2151 lua_setfield(L, stackbase+1, key);
jbe@9	2152 lua_settop(L, stackbase);
jbe@9	2153 }
jbe@9	2154 #endif
jbe@9	2155
jbe@9	2156
jbe@0	2157 /* Main function and command line invokation */
jbe@0	2158
jbe@0	2159 static void moonbr_usage(int err, const char *cmd) {
jbe@0	2160 FILE *out;
jbe@0	2161 out = err ? stderr : stdout;
jbe@0	2162 if (!cmd) cmd = "moonbridge";
jbe@0	2163 fprintf(out, "Get this help message: %s {-h\|--help}\n", cmd);
jbe@0	2164 fprintf(out, "Usage: %s \\\n", cmd);
jbe@0	2165 fprintf(out, " [-b\|--background] \\\n");
jbe@0	2166 fprintf(out, " [-d\|--debug] \\\n");
jbe@0	2167 fprintf(out, " [-f\|--logfacility {DAEMON\|USER\|0\|1\|...\|7}] \\\n");
jbe@0	2168 fprintf(out, " [-i\|--logident <syslog ident> \\\n");
jbe@0	2169 fprintf(out, " [-l\|--logfile <logfile>] \\\n");
jbe@0	2170 fprintf(out, " [-p\|--pidfile <pidfile>] \\\n");
jbe@0	2171 fprintf(out, " [-s\|--stats] \\\n");
jbe@2	2172 fprintf(out, " -- <Lua script> [<cmdline options for Lua script>]\n");
jbe@0	2173 exit(err);
jbe@0	2174 }
jbe@0	2175
jbe@0	2176 #define moonbr_usage_error() moonbr_usage(MOONBR_EXITCODE_CMDLINEERROR, argc ? argv[0] : NULL)
jbe@0	2177
jbe@0	2178 int main(int argc, char **argv) {
jbe@0	2179 {
jbe@0	2180 int daemonize = 0;
jbe@0	2181 int log_facility = LOG_USER;
jbe@0	2182 const char *log_ident = "moonbridge";
jbe@0	2183 const char *log_filename = NULL;
jbe@0	2184 const char *pid_filename = NULL;
jbe@0	2185 int option;
jbe@0	2186 struct option longopts[] = {
jbe@0	2187 { "background", no_argument, NULL, 'b' },
jbe@0	2188 { "debug", no_argument, NULL, 'd' },
jbe@0	2189 { "logfacility", required_argument, NULL, 'f' },
jbe@0	2190 { "help", no_argument, NULL, 'h' },
jbe@0	2191 { "logident", required_argument, NULL, 'i' },
jbe@0	2192 { "logfile", required_argument, NULL, 'l' },
jbe@0	2193 { "pidfile", required_argument, NULL, 'p' },
jbe@0	2194 { "stats", no_argument, NULL, 's' }
jbe@0	2195 };
jbe@0	2196 while ((option = getopt_long(argc, argv, "bdf:hi:l:p:s", longopts, NULL)) != -1) {
jbe@0	2197 switch (option) {
jbe@0	2198 case 'b':
jbe@0	2199 daemonize = 1;
jbe@0	2200 break;
jbe@0	2201 case 'd':
jbe@0	2202 moonbr_debug = 1;
jbe@0	2203 moonbr_stat = 1;
jbe@0	2204 break;
jbe@0	2205 case 'f':
jbe@0	2206 if (!strcmp(optarg, "DAEMON")) {
jbe@0	2207 log_facility = LOG_DAEMON;
jbe@0	2208 } else if (!strcmp(optarg, "USER")) {
jbe@0	2209 log_facility = LOG_USER;
jbe@0	2210 } else if (!strcmp(optarg, "0")) {
jbe@0	2211 log_facility = LOG_LOCAL0;
jbe@0	2212 } else if (!strcmp(optarg, "1")) {
jbe@0	2213 log_facility = LOG_LOCAL1;
jbe@0	2214 } else if (!strcmp(optarg, "2")) {
jbe@0	2215 log_facility = LOG_LOCAL2;
jbe@0	2216 } else if (!strcmp(optarg, "3")) {
jbe@0	2217 log_facility = LOG_LOCAL3;
jbe@0	2218 } else if (!strcmp(optarg, "4")) {
jbe@0	2219 log_facility = LOG_LOCAL4;
jbe@0	2220 } else if (!strcmp(optarg, "5")) {
jbe@0	2221 log_facility = LOG_LOCAL5;
jbe@0	2222 } else if (!strcmp(optarg, "6")) {
jbe@0	2223 log_facility = LOG_LOCAL6;
jbe@0	2224 } else if (!strcmp(optarg, "7")) {
jbe@0	2225 log_facility = LOG_LOCAL7;
jbe@0	2226 } else {
jbe@0	2227 moonbr_usage_error();
jbe@0	2228 }
jbe@0	2229 moonbr_use_syslog = 1;
jbe@0	2230 break;
jbe@0	2231 case 'h':
jbe@0	2232 moonbr_usage(MOONBR_EXITCODE_GRACEFUL, argv[0]);
jbe@0	2233 break;
jbe@0	2234 case 'i':
jbe@0	2235 log_ident = optarg;
jbe@0	2236 moonbr_use_syslog = 1;
jbe@0	2237 break;
jbe@0	2238 case 'l':
jbe@0	2239 log_filename = optarg;
jbe@0	2240 break;
jbe@0	2241 case 'p':
jbe@0	2242 pid_filename = optarg;
jbe@0	2243 break;
jbe@0	2244 case 's':
jbe@0	2245 moonbr_stat = 1;
jbe@0	2246 break;
jbe@0	2247 default:
jbe@0	2248 moonbr_usage_error();
jbe@0	2249 }
jbe@0	2250 }
jbe@2	2251 if (argc - optind < 1) moonbr_usage_error();
jbe@0	2252 if (pid_filename) {
jbe@0	2253 pid_t otherpid;
jbe@0	2254 while ((moonbr_pidfh = pidfile_open(pid_filename, 0644, &otherpid)) == NULL) {
jbe@0	2255 if (errno == EEXIST) {
jbe@0	2256 if (otherpid == -1) {
jbe@0	2257 fprintf(stderr, "PID file \"%s\" is already locked\n", pid_filename);
jbe@0	2258 } else {
jbe@0	2259 fprintf(stderr, "PID file \"%s\" is already locked by process with PID: %i\n", pid_filename, (int)otherpid);
jbe@0	2260 }
jbe@0	2261 exit(MOONBR_EXITCODE_ALREADYRUNNING);
jbe@0	2262 } else if (errno != EINTR) {
jbe@0	2263 fprintf(stderr, "Could not write PID file \"%s\": %s\n", pid_filename, strerror(errno));
jbe@0	2264 exit(MOONBR_EXITCODE_STARTUPERROR);
jbe@0	2265 }
jbe@0	2266 }
jbe@0	2267 }
jbe@0	2268 if (log_filename) {
jbe@0	2269 int logfd;
jbe@0	2270 while (
jbe@0	2271 ( logfd = flopen(
jbe@0	2272 log_filename,
jbe@0	2273 O_WRONLY\|O_NONBLOCK\|O_CREAT\|O_APPEND\|O_CLOEXEC,
jbe@0	2274 0640
jbe@0	2275 )
jbe@0	2276 ) < 0
jbe@0	2277 ) {
jbe@0	2278 if (errno == EWOULDBLOCK) {
jbe@0	2279 fprintf(stderr, "Logfile \"%s\" is locked\n", log_filename);
jbe@0	2280 exit(MOONBR_EXITCODE_ALREADYRUNNING);
jbe@0	2281 } else if (errno != EINTR) {
jbe@0	2282 fprintf(stderr, "Could not open logfile \"%s\": %s\n", log_filename, strerror(errno));
jbe@0	2283 exit(MOONBR_EXITCODE_STARTUPERROR);
jbe@0	2284 }
jbe@0	2285 }
jbe@0	2286 moonbr_logfile = fdopen(logfd, "a");
jbe@0	2287 if (!moonbr_logfile) {
jbe@0	2288 fprintf(stderr, "Could not open write stream to logfile \"%s\": %s\n", log_filename, strerror(errno));
jbe@0	2289 exit(MOONBR_EXITCODE_STARTUPERROR);
jbe@0	2290 }
jbe@0	2291 }
jbe@0	2292 if (daemonize == 0 && !moonbr_logfile) moonbr_logfile = stderr;
jbe@0	2293 if (moonbr_logfile) setlinebuf(moonbr_logfile);
jbe@0	2294 else moonbr_use_syslog = 1;
jbe@0	2295 if (moonbr_use_syslog) openlog(log_ident, LOG_NDELAY \| LOG_PID, log_facility);
jbe@0	2296 if (daemonize) {
jbe@0	2297 if (daemon(1, 0)) {
jbe@0	2298 moonbr_log(LOG_ERR, "Could not daemonize moonbridge process");
jbe@0	2299 moonbr_terminate_error();
jbe@0	2300 }
jbe@0	2301 }
jbe@0	2302 }
jbe@0	2303 moonbr_log(LOG_NOTICE, "Starting moonbridge server");
jbe@0	2304 if (moonbr_pidfh && pidfile_write(moonbr_pidfh)) {
jbe@0	2305 moonbr_log(LOG_ERR, "Could not write pidfile (after locking)");
jbe@0	2306 }
jbe@0	2307 {
jbe@0	2308 lua_State *L;
jbe@0	2309 L = lua_newstate(moonbr_alloc, NULL);
jbe@0	2310 if (!L) {
jbe@0	2311 moonbr_log(LOG_CRIT, "Could not initialize Lua state");
jbe@0	2312 moonbr_terminate_error();
jbe@0	2313 }
jbe@0	2314 lua_atpanic(L, moonbr_lua_panic);
jbe@58	2315 lua_pushliteral(L, MOONBR_VERSION_STRING);
jbe@58	2316 lua_setglobal(L, "_MOONBRIDGE_VERSION");
jbe@0	2317 luaL_openlibs(L);
jbe@89	2318 luaL_requiref(L, "moonbridge_io", luaopen_moonbridge_io, 1);
jbe@89	2319 lua_pop(L, 1);
jbe@8	2320 #ifdef MOONBR_LUA_PATH
jbe@9	2321 moonbr_modify_path(L, "path", MOONBR_LUA_PATH);
jbe@9	2322 #endif
jbe@9	2323 #ifdef MOONBR_LUA_CPATH
jbe@9	2324 moonbr_modify_path(L, "cpath", MOONBR_LUA_CPATH);
jbe@8	2325 #endif
jbe@0	2326 lua_pushcfunction(L, moonbr_timeout);
jbe@0	2327 lua_setglobal(L, "timeout");
jbe@0	2328 lua_pushcfunction(L, moonbr_listen);
jbe@0	2329 lua_setglobal(L, "listen");
jbe@17	2330 lua_pushcfunction(L, moonbr_addtraceback); /* on stack position 1 */
jbe@2	2331 moonbr_log(LOG_INFO, "Loading \"%s\"", argv[optind]);
jbe@2	2332 if (luaL_loadfile(L, argv[optind])) {
jbe@2	2333 moonbr_log(LOG_ERR, "Error while loading \"%s\": %s", argv[optind], lua_tostring(L, -1));
jbe@2	2334 moonbr_terminate_error();
jbe@2	2335 }
jbe@2	2336 { int i; for (i=optind+1; i<argc; i++) lua_pushstring(L, argv[i]); }
jbe@2	2337 if (lua_pcall(L, argc-(optind+1), 0, 1)) {
jbe@2	2338 moonbr_log(LOG_ERR, "Error while executing \"%s\": %s", argv[optind], lua_tostring(L, -1));
jbe@2	2339 moonbr_terminate_error();
jbe@0	2340 }
jbe@6	2341 if (!moonbr_first_pool) {
jbe@6	2342 moonbr_log(LOG_WARNING, "No listener initialized.");
jbe@6	2343 moonbr_terminate_error();
jbe@6	2344 }
jbe@0	2345 lua_getglobal(L, "listen");
jbe@0	2346 lua_pushcfunction(L, moonbr_listen);
jbe@0	2347 if (lua_compare(L, -2, -1, LUA_OPEQ)) {
jbe@0	2348 lua_pushnil(L);
jbe@0	2349 lua_setglobal(L, "listen");
jbe@0	2350 }
jbe@0	2351 lua_settop(L, 1);
jbe@56	2352 lua_gc(L, LUA_GCCOLLECT, 0); // collect garbage before forking later
jbe@0	2353 moonbr_run(L);
jbe@0	2354 }
jbe@0	2355 return 0;
jbe@0	2356 }
jbe@0	2357