moonbridge: moonbridge.c annotate

moonbridge

annotate moonbridge.c @ 126:e0ab9fd00cb1

Removed <file>:readuntil(...) function

author	jbe
date	Tue Apr 14 18:20:39 2015 +0200 (2015-04-14)
parents	d9cc81641175
children	37532927dba9

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