moonbridge

view moonbridge.c @ 326:4379766473ec

Fixed proper errno handling for blocking I/O in localconnect function for connecting to sockets
author jbe
date Tue Jun 23 12:25:58 2020 +0200 (3 months ago)
parents 2807fdd2f8d5
children
line source
2 /*** Version ***/
3 #define MOONBR_VERSION_STRING "1.0.1"
6 /*** Compile-time configuration ***/
8 #define MOONBR_LUA_PANIC_BUG_WORKAROUND 1
11 /*** C preprocessor macros for portability support ***/
13 #ifndef __has_include
14 #define __has_include(x) 0
15 #endif
18 /*** Include directives for used system libraries ***/
20 #include <stdlib.h>
21 #include <stdint.h>
22 #include <string.h>
23 #include <errno.h>
24 #include <unistd.h>
25 #include <signal.h>
26 #include <sys/wait.h>
27 #include <sys/resource.h>
28 #include <poll.h>
29 #include <time.h>
30 #include <sys/time.h>
31 #include <sys/socket.h>
32 #include <sys/un.h>
33 #include <netinet/in.h>
34 #include <netdb.h>
35 #include <arpa/inet.h>
36 #include <getopt.h>
37 #include <sys/file.h>
38 #include <syslog.h>
39 #if defined(__FreeBSD__) || __has_include(<libutil.h>)
40 #include <libutil.h>
41 #endif
42 #if defined(__linux__) || __has_include(<bsd/libutil.h>)
43 #include <bsd/libutil.h>
44 #endif
45 #if defined(__linux__) || __has_include(<bsd/unistd.h>)
46 #include <bsd/unistd.h>
47 #endif
50 /*** Fallback definitions for missing constants on some platforms ***/
52 /* INFTIM is used as timeout parameter for poll() */
53 #ifndef INFTIM
54 #define INFTIM -1
55 #endif
58 /*** Include directives for Lua ***/
60 #include <lua.h>
61 #include <lauxlib.h>
62 #include <lualib.h>
65 /*** Include directive for moonbridge_io library ***/
67 #include "moonbridge_io.h"
70 /*** Constants ***/
72 /* Backlog option for listen() call */
73 #define MOONBR_LISTEN_BACKLOG 1024
75 /* Maximum length of a timestamp used for strftime() */
76 #define MOONBR_LOG_MAXTIMELEN 40
78 /* Maximum length of a log message */
79 #define MOONBR_LOG_MAXMSGLEN 4095
81 /* Exitcodes passed to exit() call */
82 #define MOONBR_EXITCODE_GRACEFUL 0
83 #define MOONBR_EXITCODE_CMDLINEERROR 1
84 #define MOONBR_EXITCODE_ALREADYRUNNING 2
85 #define MOONBR_EXITCODE_STARTUPERROR 3
86 #define MOONBR_EXITCODE_RUNTIMEERROR 4
88 /* Maximum length of a line sent to stderr by child processes */
89 #define MOONBR_MAXERRORLINELEN 1024
91 /* Maximum length of an error string returned by strerror() */
92 #define MOONBR_MAXSTRERRORLEN 80
94 /* Error message for noncompliant strerror_r() implementation on GNU systems */
95 #define MOONBR_STRERROR_R_MSG "Error detail unavailable due to noncompliant strerror_r() implementation"
97 /* Status bytes exchanged between master and child processes */
98 #define MOONBR_STATUS_IDLE 'I'
99 #define MOONBR_COMMAND_CONNECT 'C'
100 #define MOONBR_COMMAND_TERMINATE 'T'
101 #define MOONBR_STATUS_GOODBYE 'B'
103 /* Constant file descriptors */
104 #define MOONBR_FD_STDERR 2
105 #define MOONBR_FD_CONTROL 3
106 #define MOONBR_FD_END 4
108 /* Return values of moonbr_try_destroy_worker() */
109 #define MOONBR_DESTROY_NONE 0
110 #define MOONBR_DESTROY_PREPARE 1
111 #define MOONBR_DESTROY_IDLE_OR_ASSIGNED 2
114 /*** Types ***/
116 /* Enum for 'moonbr_pstate' */
117 #define MOONBR_PSTATE_STARTUP 0
118 #define MOONBR_PSTATE_RUNNING 1
119 #define MOONBR_PSTATE_FORKED 2
121 /* Enum for 'proto' field of struct moonbr_listener */
122 #define MOONBR_PROTO_INTERVAL 1
123 #define MOONBR_PROTO_LOCAL 2
124 #define MOONBR_PROTO_TCP 3
126 /* Data structure for a pool's listener that can accept incoming connections */
127 struct moonbr_listener {
128 struct moonbr_pool *pool;
129 struct moonbr_listener *prev_listener; /* previous idle or(!) connected listener */
130 struct moonbr_listener *next_listener; /* next idle or(!) connected listener */
131 int proto;
132 union {
133 struct {
134 char *name; /* name of interval passed to 'connect' function as 'interval' field in table */
135 int main; /* nonzero = termination of 'connect' function causes shutdown */
136 int strict; /* nonzero = runtime of 'connect' function does not delay interval */
137 struct timeval delay; /* interval between invocations of 'connect' function */
138 struct timeval wakeup; /* point in time of next invocation */
139 } interval;
140 struct {
141 union {
142 struct sockaddr addr_abstract;
143 struct sockaddr_un addr_un;
144 struct sockaddr_in addr_in;
145 struct sockaddr_in6 addr_in6;
146 } addr;
147 socklen_t addrlen;
148 } socket;
149 } type_specific;
150 union {
151 struct {
152 char ip[INET6_ADDRSTRLEN]; /* IP to listen on */
153 int port; /* port number to listen on (in host endianess) */
154 } tcp;
155 } proto_specific;
156 int listenfd; /* -1 = none */
157 int pollidx; /* -1 = none */
158 };
160 /* Data structure for a child process that is handling incoming connections */
161 struct moonbr_worker {
162 struct moonbr_pool *pool;
163 struct moonbr_worker *prev_worker;
164 struct moonbr_worker *next_worker;
165 struct moonbr_worker *prev_idle_worker;
166 struct moonbr_worker *next_idle_worker;
167 int main; /* nonzero = terminate Moonbridge when this worker dies */
168 int idle; /* nonzero = waiting for command from parent process */
169 int assigned; /* nonzero = currently handling a connection */
170 pid_t pid;
171 int controlfd; /* socket to send/receive control message to/from child process */
172 int errorfd; /* socket to receive error output from child process' stderr */
173 char *errorlinebuf; /* optional buffer for collecting stderr data from child process */
174 int errorlinelen; /* number of bytes stored in 'errorlinebuf' */
175 int errorlineovf; /* nonzero = line length overflow */
176 struct timeval idle_expiration; /* point in time until child process may stay in idle state */
177 struct moonbr_listener *restart_interval_listener; /* set while interval listener is assigned */
178 };
180 /* Data structure for a pool of workers and listeners */
181 struct moonbr_pool {
182 int poolnum; /* number of pool for log output */
183 struct moonbr_pool *next_pool; /* next entry in linked list starting with 'moonbr_first_pool' */
184 struct moonbr_worker *first_worker; /* first worker of pool */
185 struct moonbr_worker *last_worker; /* last worker of pool */
186 struct moonbr_worker *first_idle_worker; /* first idle worker of pool */
187 struct moonbr_worker *last_idle_worker; /* last idle worker of pool */
188 int idle_worker_count;
189 int unassigned_worker_count;
190 int total_worker_count;
191 int worker_count_stat; /* only needed for statistics */
192 int pre_fork; /* desired minimum number of unassigned workers */
193 int min_fork; /* desired minimum number of workers in total */
194 int max_fork; /* maximum number of workers */
195 struct timeval fork_delay; /* delay after each fork() until a fork may happen again */
196 struct timeval fork_wakeup; /* point in time when a fork may happen again (unless a worker terminates before) */
197 struct timeval fork_error_delay; /* delay between fork()s when an error during fork or preparation occurred */
198 struct timeval fork_error_wakeup; /* point in time when fork may happen again if an error in preparation occurred */
199 int use_fork_error_wakeup; /* nonzero = error in preparation occured; gets reset on next fork */
200 struct timeval exit_delay; /* delay for terminating excessive workers (unassigned_worker_count > pre_fork) */
201 struct timeval exit_wakeup; /* point in time when terminating an excessive worker */
202 struct timeval idle_timeout; /* delay before an idle worker is terminated */
203 size_t memory_limit; /* maximum bytes of memory that the Lua machine may allocate */
204 int listener_count; /* total number of listeners of pool (and size of 'listener' array at end of this struct) */
205 struct moonbr_listener *first_idle_listener; /* first listener that is idle (i.e. has no waiting connection) */
206 struct moonbr_listener *last_idle_listener; /* last listener that is idle (i.e. has no waiting connection) */
207 struct moonbr_listener *first_connected_listener; /* first listener that has a pending connection */
208 struct moonbr_listener *last_connected_listener; /* last listener that has a pending connection */
209 struct moonbr_listener listener[1]; /* static array of variable(!) size to contain 'listener' structures */
210 };
212 /* Enum for 'channel' field of struct moonbr_poll_worker */
213 #define MOONBR_POLL_WORKER_CONTROLCHANNEL 1
214 #define MOONBR_POLL_WORKER_ERRORCHANNEL 2
216 /* Structure to refer from 'moonbr_poll_worker_fds' entry to worker structure */
217 struct moonbr_poll_worker {
218 struct moonbr_worker *worker;
219 int channel; /* field indicating whether file descriptor is 'controlfd' or 'errorfd' */
220 };
222 /* Variable indicating that clean shutdown was requested */
223 static int moonbr_shutdown_in_progress = 0;
226 /*** Macros for Lua registry ***/
228 /* Lightuserdata keys for Lua registry to store 'prepare', 'connect', and 'finish' functions */
229 #define moonbr_luakey_prepare_func(pool) ((void *)(intptr_t)(pool) + 0)
230 #define moonbr_luakey_connect_func(pool) ((void *)(intptr_t)(pool) + 1)
231 #define moonbr_luakey_finish_func(pool) ((void *)(intptr_t)(pool) + 2)
234 /*** Global variables ***/
236 /* State of process execution */
237 static int moonbr_pstate = MOONBR_PSTATE_STARTUP;
239 /* Process ID of the main process */
240 static pid_t moonbr_masterpid;
242 /* Condition variables set by the signal handler */
243 static volatile sig_atomic_t moonbr_cond_poll = 0;
244 static volatile sig_atomic_t moonbr_cond_terminate = 0;
245 static volatile sig_atomic_t moonbr_cond_interrupt = 0;
246 static volatile sig_atomic_t moonbr_cond_child = 0;
248 /* Socket pair to denote signal delivery when signal handler was called just before poll() */
249 static int moonbr_poll_signalfds[2];
250 #define moonbr_poll_signalfd_read moonbr_poll_signalfds[0]
251 #define moonbr_poll_signalfd_write moonbr_poll_signalfds[1]
253 /* Global variables for pidfile and logging */
254 static struct pidfh *moonbr_pidfh = NULL;
255 static FILE *moonbr_logfile = NULL;
256 static int moonbr_use_syslog = 0;
258 /* First and last entry of linked list of all created pools during initialization */
259 static struct moonbr_pool *moonbr_first_pool = NULL;
260 static struct moonbr_pool *moonbr_last_pool = NULL;
262 /* Total count of pools */
263 static int moonbr_pool_count = 0;
265 /* Set to a nonzero value if dynamic part of 'moonbr_poll_fds' ('moonbr_poll_worker_fds') needs an update */
266 static int moonbr_poll_refresh_needed = 0;
268 /* Array passed to poll(), consisting of static part and dynamic part ('moonbr_poll_worker_fds') */
269 static struct pollfd *moonbr_poll_fds = NULL; /* the array */
270 static int moonbr_poll_fds_bufsize = 0; /* memory allocated for this number of elements */
271 static int moonbr_poll_fds_count = 0; /* total number of elements */
272 static int moonbr_poll_fds_static_count; /* number of elements in static part */
274 /* Dynamic part of 'moonbr_poll_fds' array */
275 #define moonbr_poll_worker_fds (moonbr_poll_fds+moonbr_poll_fds_static_count)
277 /* Additional information for dynamic part of 'moonbr_poll_fds' array */
278 struct moonbr_poll_worker *moonbr_poll_workers; /* the array */
279 static int moonbr_poll_workers_bufsize = 0; /* memory allocated for this number of elements */
280 static int moonbr_poll_worker_count = 0; /* number of elements in array */
282 /* Variable set to nonzero value to disallow further calls of 'listen' function */
283 static int moonbr_booted = 0;
285 /* Verbosity settings */
286 static int moonbr_debug = 0;
287 static int moonbr_stat = 0;
289 /* Memory consumption by Lua machine */
290 static size_t moonbr_memory_usage = 0;
291 static size_t moonbr_memory_limit = 0;
294 /*** Functions for signal handling ***/
296 /* Signal handler for master and child processes */
297 static void moonbr_signal(int sig) {
298 int errno2 = errno; /* backup errno variable */
299 if (getpid() == moonbr_masterpid) {
300 /* master process */
301 switch (sig) {
302 case SIGHUP:
303 case SIGINT:
304 /* fast shutdown requested */
305 moonbr_cond_interrupt = 1;
306 break;
307 case SIGTERM:
308 /* clean shutdown requested */
309 moonbr_cond_terminate = 1;
310 break;
311 case SIGCHLD:
312 /* child process terminated */
313 moonbr_cond_child = 1;
314 break;
315 }
316 if (moonbr_cond_poll) {
317 /* avoid race condition if signal handler is invoked right before poll() */
318 char buf[1] = {0};
319 write(moonbr_poll_signalfd_write, buf, 1);
320 }
321 } else {
322 /* child process forwards certain signals to parent process */
323 switch (sig) {
324 case SIGHUP:
325 case SIGINT:
326 kill(moonbr_masterpid, sig);
327 }
328 }
329 errno = errno2; /* restore errno from backup */
330 }
332 /* Initialize signal handling */
333 static void moonbr_signal_init(){
334 moonbr_masterpid = getpid();
335 signal(SIGHUP, moonbr_signal);
336 signal(SIGINT, moonbr_signal);
337 signal(SIGTERM, moonbr_signal);
338 signal(SIGCHLD, moonbr_signal);
339 }
342 /*** Functions for logging in master process ***/
344 /* Logs a pre-formatted message with given syslog() priority */
345 static void moonbr_log_msg(int priority, const char *msg) {
346 if (moonbr_logfile) {
347 /* logging to logfile desired (timestamp is prepended in that case) */
348 time_t now_time = 0;
349 struct tm now_tmstruct;
350 char timestr[MOONBR_LOG_MAXTIMELEN+1];
351 time(&now_time);
352 localtime_r(&now_time, &now_tmstruct);
353 if (!strftime(
354 timestr, MOONBR_LOG_MAXTIMELEN+1, "%Y-%m-%d %H:%M:%S %Z: ", &now_tmstruct
355 )) timestr[0] = 0;
356 fprintf(moonbr_logfile, "%s%s\n", timestr, msg);
357 }
358 if (moonbr_use_syslog) {
359 /* logging through syslog desired */
360 syslog(priority, "%s", msg);
361 }
362 }
364 /* Formats a message via vsnprintf() and logs it with given syslog() priority */
365 static void moonbr_log(int priority, const char *message, ...) {
366 char msgbuf[MOONBR_LOG_MAXMSGLEN+1]; /* buffer of static size to store formatted message */
367 int msglen; /* length of full message (may exceed MOONBR_LOG_MAXMSGLEN) */
368 {
369 /* pass variable arguments to vsnprintf() to format message */
370 va_list ap;
371 va_start(ap, message);
372 msglen = vsnprintf(msgbuf, MOONBR_LOG_MAXMSGLEN+1, message, ap);
373 va_end(ap);
374 }
375 {
376 /* split and log message line by line */
377 char *line = msgbuf;
378 while (1) {
379 char *endptr = strchr(line, '\n');
380 if (endptr) {
381 /* terminate string where newline character is found */
382 *endptr = 0;
383 } else if (line != msgbuf && msglen > MOONBR_LOG_MAXMSGLEN) {
384 /* break if line is incomplete and not the first line */
385 break;
386 }
387 moonbr_log_msg(priority, line);
388 if (!endptr) break; /* break if end of formatted message is reached */
389 line = endptr+1; /* otherwise continue with remaining message */
390 }
391 }
392 if (msglen > MOONBR_LOG_MAXMSGLEN) {
393 /* print warning if message was truncated */
394 moonbr_log_msg(priority, "Previous log message has been truncated due to excessive length");
395 }
396 }
399 /*** Termination function ***/
401 /* Kill all child processes, remove PID file (if existent), and exit master process with given exitcode */
402 static void moonbr_terminate(int exitcode) {
403 {
404 struct moonbr_pool *pool;
405 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
406 {
407 struct moonbr_worker *worker;
408 for (worker=pool->first_worker; worker; worker=worker->next_worker) {
409 moonbr_log(LOG_INFO, "Sending SIGKILL to child with PID %i", (int)worker->pid);
410 if (kill(worker->pid, SIGKILL)) {
411 moonbr_log(LOG_ERR, "Error while killing child process: %s", strerror(errno));
412 }
413 }
414 }
415 {
416 int i;
417 for (i=0; i<pool->listener_count; i++) {
418 struct moonbr_listener *listener = &pool->listener[i];
419 if (listener->proto == MOONBR_PROTO_LOCAL) {
420 moonbr_log(LOG_INFO, "Unlinking local socket \"%s\"", listener->type_specific.socket.addr.addr_un.sun_path);
421 if (unlink(listener->type_specific.socket.addr.addr_un.sun_path)) {
422 moonbr_log(LOG_ERR, "Error while unlinking local socket: %s", strerror(errno));
423 }
424 }
425 }
426 }
427 }
428 }
429 moonbr_log(exitcode ? LOG_ERR : LOG_NOTICE, "Terminating with exit code %i", exitcode);
430 if (moonbr_pidfh && pidfile_remove(moonbr_pidfh)) {
431 moonbr_log(LOG_ERR, "Error while removing PID file: %s", strerror(errno));
432 }
433 exit(exitcode);
434 }
436 /* Terminate with either MOONBR_EXITCODE_STARTUPERROR or MOONBR_EXITCODE_RUNTIMEERROR */
437 #define moonbr_terminate_error() \
438 moonbr_terminate( \
439 moonbr_pstate == MOONBR_PSTATE_STARTUP ? \
440 MOONBR_EXITCODE_STARTUPERROR : \
441 MOONBR_EXITCODE_RUNTIMEERROR \
442 )
445 /*** Helper functions ***/
447 /* Fills a 'struct timeval' structure with the current time (using CLOCK_MONOTONIC) */
448 static void moonbr_now(struct timeval *now) {
449 struct timespec ts = {0, };
450 if (clock_gettime(CLOCK_MONOTONIC, &ts)) {
451 moonbr_log(LOG_CRIT, "Error in clock_gettime() call: %s", strerror(errno));
452 moonbr_terminate_error();
453 }
454 *now = (struct timeval){ .tv_sec = ts.tv_sec, .tv_usec = ts.tv_nsec / 1000 };
455 }
457 /* Formats a 'struct timeval' value (not thread-safe) */
458 static char *moonbr_format_timeval(struct timeval *t) {
459 static char buf[32];
460 snprintf(buf, 32, "%ji.%06ji seconds", (intmax_t)t->tv_sec, (intmax_t)t->tv_usec);
461 return buf;
462 }
465 /*** Functions for pool creation and startup ***/
467 /* Creates a 'struct moonbr_pool' structure with a given number of listeners */
468 static struct moonbr_pool *moonbr_create_pool(int listener_count) {
469 struct moonbr_pool *pool;
470 pool = calloc(1,
471 sizeof(struct moonbr_pool) + /* size of 'struct moonbr_pool' with one listener */
472 (listener_count-1) * sizeof(struct moonbr_listener) /* size of extra listeners */
473 );
474 if (!pool) {
475 moonbr_log(LOG_CRIT, "Memory allocation error");
476 moonbr_terminate_error();
477 }
478 pool->listener_count = listener_count;
479 {
480 /* initialization of listeners */
481 int i;
482 for (i=0; i<listener_count; i++) {
483 struct moonbr_listener *listener = &pool->listener[i];
484 listener->pool = pool;
485 listener->listenfd = -1;
486 listener->pollidx = -1;
487 }
488 }
489 return pool;
490 }
492 /* Destroys a 'struct moonbr_pool' structure before it has been started */
493 static void moonbr_destroy_pool(struct moonbr_pool *pool) {
494 int i;
495 for (i=0; i<pool->listener_count; i++) {
496 struct moonbr_listener *listener = &pool->listener[i];
497 if (
498 listener->proto == MOONBR_PROTO_INTERVAL &&
499 listener->type_specific.interval.name
500 ) {
501 free(listener->type_specific.interval.name);
502 }
503 }
504 free(pool);
505 }
507 /* Starts a all listeners in a pool */
508 static int moonbr_start_pool(struct moonbr_pool *pool) {
509 moonbr_log(LOG_INFO, "Creating pool", pool->poolnum);
510 {
511 int i;
512 for (i=0; i<pool->listener_count; i++) {
513 struct moonbr_listener *listener = &pool->listener[i];
514 switch (listener->proto) {
515 case MOONBR_PROTO_INTERVAL:
516 if (listener->type_specific.interval.main) {
517 /* nothing to do here: starting main thread is performed in moonbr_run() function */
518 if (!listener->type_specific.interval.name) {
519 moonbr_log(LOG_INFO, "Adding unnamed main thread");
520 } else {
521 moonbr_log(LOG_INFO, "Adding main thread \"%s\"", listener->type_specific.interval.name);
522 }
523 } else {
524 /* nothing to do here: starting intervals is performed in moonbr_run() function */
525 if (!listener->type_specific.interval.name) {
526 moonbr_log(LOG_INFO, "Adding unnamed interval listener");
527 } else {
528 moonbr_log(LOG_INFO, "Adding interval listener \"%s\"", listener->type_specific.interval.name);
529 }
530 }
531 break;
532 case MOONBR_PROTO_LOCAL:
533 moonbr_log(LOG_INFO, "Adding local socket listener for path \"%s\"", listener->type_specific.socket.addr.addr_un.sun_path);
534 listener->listenfd = socket(PF_LOCAL, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
535 if (listener->listenfd == -1) goto moonbr_start_pool_error;
536 if (!unlink(listener->type_specific.socket.addr.addr_un.sun_path)) {
537 moonbr_log(LOG_WARNING, "Unlinked named socket \"%s\" prior to listening", listener->type_specific.socket.addr.addr_un.sun_path);
538 } else {
539 if (errno != ENOENT) {
540 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));
541 }
542 }
543 if (
544 bind(listener->listenfd, &listener->type_specific.socket.addr.addr_abstract, listener->type_specific.socket.addrlen)
545 ) goto moonbr_start_pool_error;
546 if (listen(listener->listenfd, MOONBR_LISTEN_BACKLOG)) goto moonbr_start_pool_error;
547 break;
548 case MOONBR_PROTO_TCP:
549 moonbr_log(LOG_INFO, "Adding TCP listener on interface \"%s\", port %i", listener->proto_specific.tcp.ip, listener->proto_specific.tcp.port);
550 listener->listenfd = socket(listener->type_specific.socket.addr.addr_abstract.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); /* NOTE: not correctly using PF_* but AF_* constants here */
551 if (listener->listenfd == -1) goto moonbr_start_pool_error;
552 {
553 /* avoid "Address already in use" error when restarting service */
554 static const int reuseval = 1;
555 if (setsockopt(
556 listener->listenfd, SOL_SOCKET, SO_REUSEADDR, &reuseval, sizeof(reuseval)
557 )) goto moonbr_start_pool_error;
558 }
559 {
560 /* default to send TCP RST when process terminates unexpectedly */
561 static const struct linger lingerval = {
562 .l_onoff = 1,
563 .l_linger = 0
564 };
565 if (setsockopt(
566 listener->listenfd, SOL_SOCKET, SO_LINGER, &lingerval, sizeof(lingerval)
567 )) goto moonbr_start_pool_error;
568 }
569 if (
570 bind(listener->listenfd, &listener->type_specific.socket.addr.addr_abstract, listener->type_specific.socket.addrlen)
571 ) goto moonbr_start_pool_error;
572 if (listen(listener->listenfd, MOONBR_LISTEN_BACKLOG)) goto moonbr_start_pool_error;
573 break;
574 default:
575 moonbr_log(LOG_CRIT, "Internal error (should not happen): Unexpected value in listener.proto field");
576 moonbr_terminate_error();
577 }
578 }
579 goto moonbr_start_pool_ok;
580 moonbr_start_pool_error:
581 {
582 int j = i;
583 int errno2 = errno;
584 for (; i>=0; i--) {
585 struct moonbr_listener *listener = &pool->listener[i];
586 if (listener->listenfd != -1) close(listener->listenfd);
587 }
588 errno = errno2;
589 return j;
590 }
591 }
592 moonbr_start_pool_ok:
593 pool->poolnum = ++moonbr_pool_count;
594 moonbr_log(LOG_INFO, "Pool #%i created", pool->poolnum);
595 if (moonbr_last_pool) moonbr_last_pool->next_pool = pool;
596 else moonbr_first_pool = pool;
597 moonbr_last_pool = pool;
598 return -1;
599 }
602 /*** Function to send data and a file descriptor to child process */
604 /* Sends control message of one bye plus optional file descriptor plus optional pointer to child process */
605 static void moonbr_send_control_message(struct moonbr_worker *worker, char status, int fd, void *ptr) {
606 {
607 struct iovec iovector = { .iov_base = &status, .iov_len = 1 }; /* carrying status byte */
608 char control_message_buffer[CMSG_SPACE(sizeof(int))] = {0, }; /* used to transfer file descriptor */
609 struct msghdr message = { .msg_iov = &iovector, .msg_iovlen = 1 }; /* data structure passed to sendmsg() call */
610 if (moonbr_debug) {
611 if (fd == -1) {
612 moonbr_log(LOG_DEBUG, "Sending control message \"%c\" to child process in pool #%i (PID %i)", (int)status, worker->pool->poolnum, (int)worker->pid);
613 } else {
614 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);
615 }
616 }
617 if (fd != -1) {
618 /* attach control message with file descriptor */
619 message.msg_control = control_message_buffer;
620 message.msg_controllen = CMSG_SPACE(sizeof(int));
621 {
622 struct cmsghdr *control_message = CMSG_FIRSTHDR(&message);
623 control_message->cmsg_level = SOL_SOCKET;
624 control_message->cmsg_type = SCM_RIGHTS;
625 control_message->cmsg_len = CMSG_LEN(sizeof(int));
626 memcpy(CMSG_DATA(control_message), &fd, sizeof(int));
627 }
628 }
629 while (sendmsg(worker->controlfd, &message, MSG_NOSIGNAL) < 0) {
630 if (errno == EPIPE) {
631 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));
632 return; /* do not close socket; socket is closed when reading from it */
633 }
634 if (errno != EINTR) {
635 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));
636 moonbr_terminate_error();
637 }
638 }
639 }
640 if (ptr) {
641 char buf[sizeof(void *)];
642 char *pos = buf;
643 int len = sizeof(void *);
644 ssize_t written;
645 if (moonbr_debug) {
646 moonbr_log(LOG_DEBUG, "Sending memory pointer to child process in pool #%i (PID %i)", (int)status, worker->pool->poolnum, (int)worker->pid);
647 }
648 memcpy(buf, &ptr, sizeof(void *));
649 while (len) {
650 written = send(worker->controlfd, pos, len, MSG_NOSIGNAL);
651 if (written > 0) {
652 pos += written;
653 len -= written;
654 } else if (errno == EPIPE) {
655 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));
656 return; /* do not close socket; socket is closed when reading from it */
657 } else if (errno != EINTR) {
658 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));
659 moonbr_terminate_error();
660 }
661 }
662 }
663 }
666 /*** Functions running in child process ***/
668 /* Logs an error in child process */
669 static void moonbr_child_log(const char *message) {
670 fprintf(stderr, "%s\n", message);
671 }
673 /* Logs a fatal error in child process and terminates process with error status */
674 static void moonbr_child_log_fatal(const char *message) {
675 moonbr_child_log(message);
676 exit(1);
677 }
679 /* Logs an error in child process while appending error string for global errno variable */
680 static void moonbr_child_log_errno(const char *message) {
681 char errmsg[MOONBR_MAXSTRERRORLEN] = MOONBR_STRERROR_R_MSG;
682 strerror_r(errno, errmsg, MOONBR_MAXSTRERRORLEN); /* use thread-safe call in case child created threads */
683 fprintf(stderr, "%s: %s\n", message, errmsg);
684 }
686 /* Logs a fatal error in child process while appending error string for errno and terminating process */
687 static void moonbr_child_log_errno_fatal(const char *message) {
688 moonbr_child_log_errno(message);
689 exit(1);
690 }
692 /* Receives a control message consisting of one character plus an optional file descriptor from parent process */
693 static void moonbr_child_receive_control_message(int socketfd, char *status, int *fd) {
694 struct iovec iovector = { .iov_base = status, .iov_len = 1 }; /* reference to status byte variable */
695 char control_message_buffer[CMSG_SPACE(sizeof(int))] = {0, }; /* used to receive file descriptor */
696 struct msghdr message = { /* data structure passed to recvmsg() call */
697 .msg_iov = &iovector,
698 .msg_iovlen = 1,
699 .msg_control = control_message_buffer,
700 .msg_controllen = CMSG_SPACE(sizeof(int))
701 };
702 {
703 int received;
704 while ((received = recvmsg(socketfd, &message, MSG_CMSG_CLOEXEC)) < 0) {
705 if (errno != EINTR) {
706 moonbr_child_log_errno_fatal("Error while trying to receive connection socket from parent process");
707 }
708 }
709 if (!received) {
710 moonbr_child_log_fatal("Unexpected EOF while trying to receive connection socket from parent process");
711 }
712 }
713 {
714 struct cmsghdr *control_message = CMSG_FIRSTHDR(&message);
715 if (control_message) {
716 if (control_message->cmsg_level != SOL_SOCKET) {
717 moonbr_child_log_fatal("Received control message with cmsg_level not equal to SOL_SOCKET");
718 }
719 if (control_message->cmsg_type != SCM_RIGHTS) {
720 moonbr_child_log_fatal("Received control message with cmsg_type not equal to SCM_RIGHTS");
721 }
722 memcpy(fd, CMSG_DATA(control_message), sizeof(int));
723 } else {
724 *fd = -1;
725 }
726 }
727 }
729 /* Receives a pointer from parent process */
730 static void *moonbr_child_receive_pointer(int socketfd) {
731 char buf[sizeof(void *)];
732 char *pos = buf;
733 int len = sizeof(void *);
734 ssize_t bytes_read;
735 while (len) {
736 bytes_read = recv(socketfd, pos, len, 0);
737 if (bytes_read > 0) {
738 pos += bytes_read;
739 len -= bytes_read;
740 } else if (!bytes_read) {
741 moonbr_child_log_fatal("Unexpected EOF while trying to receive memory pointer from parent process");
742 } else if (errno != EINTR) {
743 moonbr_child_log_errno_fatal("Error while trying to receive memory pointer from parent process");
744 }
745 }
746 {
747 void *ptr; /* avoid breaking strict-aliasing rules */
748 memcpy(&ptr, buf, sizeof(void *));
749 return ptr;
750 }
751 }
753 /* Main function of child process to be called after fork() and file descriptor rearrangement */
754 void moonbr_child_run(struct moonbr_pool *pool, lua_State *L) {
755 char controlmsg;
756 int fd;
757 struct itimerval notimer = { { 0, }, { 0, } };
758 lua_rawgetp(L, LUA_REGISTRYINDEX, moonbr_luakey_prepare_func(pool));
759 if (lua_isnil(L, -1)) lua_pop(L, 1);
760 else if (lua_pcall(L, 0, 0, 1)) {
761 fprintf(stderr, "Error in \"prepare\" function: %s\n", lua_tostring(L, -1));
762 exit(1);
763 }
764 moonbr_io_catch_sigterm(L); // NOTE: should not fail
765 while (1) {
766 struct moonbr_listener *listener;
767 if (setitimer(ITIMER_REAL, &notimer, NULL)) {
768 moonbr_child_log_errno_fatal("Could not reset ITIMER_REAL via setitimer()");
769 }
770 controlmsg = MOONBR_STATUS_IDLE;
771 if (write(MOONBR_FD_CONTROL, &controlmsg, 1) <= 0) {
772 moonbr_child_log_errno_fatal("Error while sending ready message to parent process");
773 }
774 moonbr_child_receive_control_message(MOONBR_FD_CONTROL, &controlmsg, &fd);
775 if (!(
776 (controlmsg == MOONBR_COMMAND_TERMINATE && fd == -1) ||
777 (controlmsg == MOONBR_COMMAND_CONNECT)
778 )) {
779 moonbr_child_log_fatal("Received illegal control message from parent process");
780 }
781 if (controlmsg == MOONBR_COMMAND_TERMINATE) break;
782 moonbr_io_sigterm_flag = 0; /* ignore any prior SIGTERM (can't be handled in blocking recv anyway) */
783 listener = moonbr_child_receive_pointer(MOONBR_FD_CONTROL);
784 if (
785 listener->proto != MOONBR_PROTO_LOCAL &&
786 listener->proto != MOONBR_PROTO_TCP &&
787 fd >= 0
788 ) {
789 moonbr_child_log_fatal("Received unexpected file descriptor from parent process");
790 } else if (
791 listener->proto != MOONBR_PROTO_INTERVAL && fd < 0
792 ) {
793 moonbr_child_log_fatal("Missing file descriptor from parent process");
794 }
795 if (fd >= 0) moonbr_io_pushhandle(L, fd);
796 lua_rawgetp(L, LUA_REGISTRYINDEX, moonbr_luakey_connect_func(pool));
797 if (fd < 0) {
798 lua_newtable(L);
799 if (listener->proto == MOONBR_PROTO_INTERVAL) {
800 lua_pushstring(L,
801 listener->type_specific.interval.name ?
802 listener->type_specific.interval.name : ""
803 );
804 if (listener->type_specific.interval.main) {
805 lua_setfield(L, -2, "main");
806 } else {
807 lua_setfield(L, -2, "interval");
808 }
809 }
810 } else {
811 lua_pushvalue(L, -2);
812 }
813 if (lua_pcall(L, 1, 1, 1)) {
814 fprintf(stderr, "Error in \"connect\" function: %s\n", lua_tostring(L, -1));
815 exit(1);
816 }
817 if (fd >= 0) moonbr_io_closehandle(L, -2, 0); /* attemt clean close */
818 if (
819 moonbr_io_sigterm_flag ||
820 lua_type(L, -1) != LUA_TBOOLEAN || !lua_toboolean(L, -1)
821 ) break;
822 #ifdef MOONBR_LUA_PANIC_BUG_WORKAROUND
823 lua_settop(L, 2);
824 #else
825 lua_settop(L, 1);
826 #endif
827 }
828 controlmsg = MOONBR_STATUS_GOODBYE;
829 if (write(MOONBR_FD_CONTROL, &controlmsg, 1) <= 0) {
830 moonbr_child_log_errno_fatal("Error while sending goodbye message to parent process");
831 }
832 if (close(MOONBR_FD_CONTROL) && errno != EINTR) {
833 moonbr_child_log_errno("Error while closing control socket");
834 }
835 lua_rawgetp(L, LUA_REGISTRYINDEX, moonbr_luakey_finish_func(pool));
836 if (lua_isnil(L, -1)) lua_pop(L, 1);
837 else if (lua_pcall(L, 0, 0, 1)) {
838 fprintf(stderr, "Error in \"finish\" function: %s\n", lua_tostring(L, -1));
839 exit(1);
840 }
841 lua_close(L);
842 exit(0);
843 }
846 /*** Functions to spawn child process ***/
848 /* Helper function to send an error message to a file descriptor (not needing a file stream) */
849 static void moonbr_child_emergency_print(int fd, char *message) {
850 size_t len = strlen(message);
851 ssize_t written;
852 while (len) {
853 written = write(fd, message, len);
854 if (written > 0) {
855 message += written;
856 len -= written;
857 } else {
858 if (written != -1 || errno != EINTR) break;
859 }
860 }
861 }
863 /* Helper function to send an error message plus a text for errno to a file descriptor and terminate the process */
864 static void moonbr_child_emergency_error(int fd, char *message) {
865 int errno2 = errno;
866 moonbr_child_emergency_print(fd, message);
867 moonbr_child_emergency_print(fd, ": ");
868 moonbr_child_emergency_print(fd, strerror(errno2));
869 moonbr_child_emergency_print(fd, "\n");
870 exit(1);
871 }
873 /* Creates a child process and (in case of success) registers it in the 'struct moonbr_pool' structure */
874 static int moonbr_create_worker(struct moonbr_pool *pool, lua_State *L) {
875 struct moonbr_worker *worker;
876 worker = calloc(1, sizeof(struct moonbr_worker));
877 if (!worker) {
878 moonbr_log(LOG_CRIT, "Memory allocation error");
879 return -1;
880 }
881 worker->pool = pool;
882 {
883 int controlfds[2];
884 int errorfds[2];
885 if (socketpair(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, controlfds)) {
886 moonbr_log(LOG_ERR, "Could not create control socket pair for communcation with child process: %s", strerror(errno));
887 free(worker);
888 return -1;
889 }
890 if (socketpair(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, errorfds)) {
891 moonbr_log(LOG_ERR, "Could not create socket pair to redirect stderr of child process: %s", strerror(errno));
892 close(controlfds[0]);
893 close(controlfds[1]);
894 free(worker);
895 return -1;
896 }
897 if (moonbr_logfile && fflush(moonbr_logfile)) {
898 moonbr_log(LOG_CRIT, "Could not flush log file prior to forking: %s", strerror(errno));
899 moonbr_terminate_error();
900 }
901 worker->pid = fork();
902 if (worker->pid == -1) {
903 moonbr_log(LOG_ERR, "Could not fork: %s", strerror(errno));
904 close(controlfds[0]);
905 close(controlfds[1]);
906 close(errorfds[0]);
907 close(errorfds[1]);
908 free(worker);
909 return -1;
910 } else if (!worker->pid) {
911 moonbr_pstate = MOONBR_PSTATE_FORKED;
912 #ifdef MOONBR_LUA_PANIC_BUG_WORKAROUND
913 lua_pushliteral(L, "Failed to pass error message due to bug in Lua panic handler (hint: not enough memory?)");
914 #endif
915 moonbr_memory_limit = pool->memory_limit;
916 if (moonbr_pidfh && pidfile_close(moonbr_pidfh)) {
917 moonbr_child_emergency_error(errorfds[1], "Could not close PID file in forked child process");
918 }
919 if (moonbr_logfile && moonbr_logfile != stderr && fclose(moonbr_logfile)) {
920 moonbr_child_emergency_error(errorfds[1], "Could not close log file in forked child process");
921 }
922 if (dup2(errorfds[1], MOONBR_FD_STDERR) == -1) {
923 moonbr_child_emergency_error(errorfds[1], "Could not duplicate socket to stderr file descriptor");
924 }
925 if (dup2(controlfds[1], MOONBR_FD_CONTROL) == -1) {
926 moonbr_child_emergency_error(errorfds[1], "Could not duplicate control socket");
927 }
928 closefrom(MOONBR_FD_END);
929 moonbr_child_run(pool, L);
930 }
931 if (moonbr_stat) {
932 moonbr_log(LOG_INFO, "Created new worker in pool #%i with PID %i", worker->pool->poolnum, (int)worker->pid);
933 }
934 worker->controlfd = controlfds[0];
935 worker->errorfd = errorfds[0];
936 if (close(controlfds[1]) && errno != EINTR) {
937 moonbr_log(LOG_CRIT, "Could not close opposite end of control file descriptor after forking");
938 moonbr_terminate_error();
939 }
940 if (close(errorfds[1]) && errno != EINTR) {
941 moonbr_log(LOG_CRIT, "Could not close opposite end of control file descriptor after forking");
942 moonbr_terminate_error();
943 }
944 }
945 worker->prev_worker = pool->last_worker;
946 if (worker->prev_worker) worker->prev_worker->next_worker = worker;
947 else pool->first_worker = worker;
948 pool->last_worker = worker;
949 pool->unassigned_worker_count++;
950 pool->total_worker_count++;
951 pool->worker_count_stat = 1;
952 moonbr_poll_refresh_needed = 1;
953 return 0; /* return zero only in case of success */
954 }
957 /*** Functions for queues of 'struct moonbr_listener' ***/
959 /* Appends a 'struct moonbr_listener' to the queue of idle listeners and registers it for poll() */
960 static void moonbr_add_idle_listener(struct moonbr_listener *listener) {
961 listener->prev_listener = listener->pool->last_idle_listener;
962 if (listener->prev_listener) listener->prev_listener->next_listener = listener;
963 else listener->pool->first_idle_listener = listener;
964 listener->pool->last_idle_listener = listener;
965 if (listener->pollidx != -1) moonbr_poll_fds[listener->pollidx].events |= POLLIN;
966 }
968 /* Removes a 'struct moonbr_listener' from the queue of idle listeners and unregisters it from poll() */
969 static void moonbr_remove_idle_listener(struct moonbr_listener *listener) {
970 if (listener->prev_listener) listener->prev_listener->next_listener = listener->next_listener;
971 else listener->pool->first_idle_listener = listener->next_listener;
972 if (listener->next_listener) listener->next_listener->prev_listener = listener->prev_listener;
973 else listener->pool->last_idle_listener = listener->prev_listener;
974 listener->prev_listener = NULL;
975 listener->next_listener = NULL;
976 if (listener->pollidx != -1) moonbr_poll_fds[listener->pollidx].events &= ~POLLIN;
977 }
979 /* Adds a listener to the queue of connected listeners (i.e. waiting to have their incoming connection accepted) */
980 static void moonbr_add_connected_listener(struct moonbr_listener *listener) {
981 listener->prev_listener = listener->pool->last_connected_listener;
982 if (listener->prev_listener) listener->prev_listener->next_listener = listener;
983 else listener->pool->first_connected_listener = listener;
984 listener->pool->last_connected_listener = listener;
985 }
987 /* Removes and returns the first connected listener in the queue */
988 static struct moonbr_listener *moonbr_pop_connected_listener(struct moonbr_pool *pool) {
989 struct moonbr_listener *listener = pool->first_connected_listener;
990 listener->pool->first_connected_listener = listener->next_listener;
991 if (listener->pool->first_connected_listener) listener->pool->first_connected_listener->prev_listener = NULL;
992 else listener->pool->last_connected_listener = NULL;
993 listener->next_listener = NULL;
994 return listener;
995 }
998 /*** Functions to handle polling ***/
1000 /* Returns an index to a new initialized entry in moonbr_poll_fds[] */
1001 int moonbr_poll_fds_nextindex() {
1002 if (moonbr_poll_fds_count >= moonbr_poll_fds_bufsize) {
1003 if (moonbr_poll_fds_bufsize) moonbr_poll_fds_bufsize *= 2;
1004 else moonbr_poll_fds_bufsize = 1;
1005 moonbr_poll_fds = realloc(
1006 moonbr_poll_fds, moonbr_poll_fds_bufsize * sizeof(struct pollfd)
1007 );
1008 if (!moonbr_poll_fds) {
1009 moonbr_log(LOG_CRIT, "Memory allocation error");
1010 moonbr_terminate_error();
1013 moonbr_poll_fds[moonbr_poll_fds_count] = (struct pollfd){0, };
1014 return moonbr_poll_fds_count++;
1017 /* Returns an index to a new initialized entry in moonbr_poll_workers[] */
1018 int moonbr_poll_workers_nextindex() {
1019 if (moonbr_poll_worker_count >= moonbr_poll_workers_bufsize) {
1020 if (moonbr_poll_workers_bufsize) moonbr_poll_workers_bufsize *= 2;
1021 else moonbr_poll_workers_bufsize = 1;
1022 moonbr_poll_workers = realloc(
1023 moonbr_poll_workers, moonbr_poll_workers_bufsize * sizeof(struct moonbr_poll_worker)
1024 );
1025 if (!moonbr_poll_workers) {
1026 moonbr_log(LOG_CRIT, "Memory allocation error");
1027 moonbr_terminate_error();
1030 moonbr_poll_workers[moonbr_poll_worker_count] = (struct moonbr_poll_worker){0, };
1031 return moonbr_poll_worker_count++;
1034 /* Queues all listeners as idle, and initializes static part of moonbr_poll_fds[], which is passed to poll() */
1035 static void moonbr_poll_init() {
1036 if (socketpair(
1037 PF_LOCAL,
1038 SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
1039 0,
1040 moonbr_poll_signalfds
1041 )) {
1042 moonbr_log(LOG_CRIT, "Could not create socket pair for signal delivery during polling: %s", strerror(errno));
1043 moonbr_terminate_error();
1046 int j = moonbr_poll_fds_nextindex();
1047 struct pollfd *pollfd = &moonbr_poll_fds[j];
1048 pollfd->fd = moonbr_poll_signalfd_read;
1049 pollfd->events = POLLIN;
1052 struct moonbr_pool *pool;
1053 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
1054 int i;
1055 for (i=0; i<pool->listener_count; i++) {
1056 struct moonbr_listener *listener = &pool->listener[i];
1057 if (listener->listenfd != -1) {
1058 int j = moonbr_poll_fds_nextindex();
1059 listener->pollidx = j;
1060 moonbr_poll_fds[j].fd = listener->listenfd;
1062 moonbr_add_idle_listener(listener);
1066 moonbr_poll_fds_static_count = moonbr_poll_fds_count; /* remember size of static part of array */
1069 /* Disables polling of all listeners (required for clean shutdown) */
1070 static void moonbr_poll_shutdown() {
1071 int i;
1072 for (i=1; i<moonbr_poll_fds_static_count; i++) {
1073 moonbr_poll_fds[i].fd = -1;
1077 /* (Re)builds dynamic part of moonbr_poll_fds[] array, and (re)builds moonbr_poll_workers[] array */
1078 static void moonbr_poll_refresh() {
1079 moonbr_poll_refresh_needed = 0;
1080 moonbr_poll_fds_count = moonbr_poll_fds_static_count;
1081 moonbr_poll_worker_count = 0;
1083 struct moonbr_pool *pool;
1084 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
1085 struct moonbr_worker *worker;
1086 for (worker=pool->first_worker; worker; worker=worker->next_worker) {
1087 if (worker->controlfd != -1) {
1088 int j = moonbr_poll_fds_nextindex();
1089 int k = moonbr_poll_workers_nextindex();
1090 struct pollfd *pollfd = &moonbr_poll_fds[j];
1091 struct moonbr_poll_worker *poll_worker = &moonbr_poll_workers[k];
1092 pollfd->fd = worker->controlfd;
1093 pollfd->events = POLLIN;
1094 poll_worker->channel = MOONBR_POLL_WORKER_CONTROLCHANNEL;
1095 poll_worker->worker = worker;
1097 if (worker->errorfd != -1) {
1098 int j = moonbr_poll_fds_nextindex();
1099 int k = moonbr_poll_workers_nextindex();
1100 struct pollfd *pollfd = &moonbr_poll_fds[j];
1101 struct moonbr_poll_worker *poll_worker = &moonbr_poll_workers[k];
1102 pollfd->fd = worker->errorfd;
1103 pollfd->events = POLLIN;
1104 poll_worker->channel = MOONBR_POLL_WORKER_ERRORCHANNEL;
1105 poll_worker->worker = worker;
1112 /* resets socket and 'revents' field of moonbr_poll_fds[] for signal delivery just before poll() is called */
1113 static void moonbr_poll_reset_signal() {
1114 ssize_t readcount;
1115 char buf[1];
1116 moonbr_poll_fds[0].revents = 0;
1117 while ((readcount = read(moonbr_poll_signalfd_read, buf, 1)) < 0) {
1118 if (errno == EAGAIN) break;
1119 if (errno != EINTR) {
1120 moonbr_log(LOG_CRIT, "Error while reading from signal delivery socket: %s", strerror(errno));
1121 moonbr_terminate_error();
1124 if (!readcount) {
1125 moonbr_log(LOG_CRIT, "Unexpected EOF when reading from signal delivery socket: %s", strerror(errno));
1126 moonbr_terminate_error();
1131 /*** Shutdown initiation ***/
1133 /* Sets global variable 'moonbr_shutdown_in_progress', closes listeners, and demands worker termination */
1134 static void moonbr_initiate_shutdown() {
1135 struct moonbr_pool *pool;
1136 int i;
1137 struct moonbr_worker *worker;
1138 if (moonbr_shutdown_in_progress) {
1139 moonbr_log(LOG_NOTICE, "Shutdown already in progress");
1140 return;
1142 moonbr_shutdown_in_progress = 1;
1143 moonbr_log(LOG_NOTICE, "Initiate shutdown");
1144 for (pool = moonbr_first_pool; pool; pool = pool->next_pool) {
1145 for (i=0; i<pool->listener_count; i++) {
1146 struct moonbr_listener *listener = &pool->listener[i];
1147 if (listener->listenfd != -1) {
1148 if (close(listener->listenfd) && errno != EINTR) {
1149 moonbr_log(LOG_CRIT, "Could not close listening socket: %s", strerror(errno));
1150 moonbr_terminate_error();
1154 for (worker=pool->first_worker; worker; worker=worker->next_worker) {
1155 if (moonbr_debug) {
1156 moonbr_log(LOG_DEBUG, "Sending SIGTERM to child with PID %i", (int)worker->pid);
1158 if (kill(worker->pid, SIGTERM)) {
1159 moonbr_log(LOG_ERR, "Error while terminating child process: %s", strerror(errno));
1163 moonbr_poll_shutdown(); /* avoids loops due to error condition when polling closed listeners */
1167 /*** Functions to handle previously created 'struct moonbr_worker' structures ***/
1169 #define moonbr_try_destroy_worker_stat(str, field) \
1170 moonbr_log(LOG_INFO, "Resource usage in pool #%i for PID %i: " str " %li", worker->pool->poolnum, (int)worker->pid, (long)childusage.field);
1172 /* Destroys a worker structure if socket connections have been closed and child process has terminated */
1173 static int moonbr_try_destroy_worker(struct moonbr_worker *worker) {
1174 if (worker->controlfd != -1 || worker->errorfd != -1) return MOONBR_DESTROY_NONE;
1176 int childstatus;
1177 struct rusage childusage;
1179 pid_t waitedpid;
1180 while (
1181 (waitedpid = wait4(worker->pid, &childstatus, WNOHANG, &childusage)) == -1
1182 ) {
1183 if (errno != EINTR) {
1184 moonbr_log(LOG_CRIT, "Error in wait4() call: %s", strerror(errno));
1185 moonbr_terminate_error();
1188 if (!waitedpid) return 0; /* return 0 if worker couldn't be destroyed */
1189 if (waitedpid != worker->pid) {
1190 moonbr_log(LOG_CRIT, "Wrong PID returned by wait4() call");
1191 moonbr_terminate_error();
1194 if (WIFEXITED(childstatus)) {
1195 if (WEXITSTATUS(childstatus) || moonbr_stat) {
1196 moonbr_log(
1197 WEXITSTATUS(childstatus) ? LOG_WARNING : LOG_INFO,
1198 "Child process in pool #%i with PID %i returned with exit code %i", worker->pool->poolnum, (int)worker->pid, WEXITSTATUS(childstatus)
1199 );
1201 } else if (WIFSIGNALED(childstatus)) {
1202 if (WCOREDUMP(childstatus)) {
1203 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));
1204 } else if (WTERMSIG(childstatus) == SIGALRM) {
1205 moonbr_log(LOG_WARNING, "Child process in pool #%i with PID %i exited prematurely due to timeout", worker->pool->poolnum, (int)worker->pid);
1206 } else {
1207 moonbr_log(LOG_ERR, "Child process in pool #%i with PID %i died from signal %i", worker->pool->poolnum, (int)worker->pid, WTERMSIG(childstatus));
1209 } else {
1210 moonbr_log(LOG_CRIT, "Illegal exit status from child process in pool #%i with PID %i", worker->pool->poolnum, (int)worker->pid);
1211 moonbr_terminate_error();
1213 if (moonbr_stat) {
1214 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));
1215 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));
1216 moonbr_try_destroy_worker_stat("max resident set size", ru_maxrss);
1217 moonbr_try_destroy_worker_stat("integral shared memory size", ru_ixrss);
1218 moonbr_try_destroy_worker_stat("integral unshared data", ru_idrss);
1219 moonbr_try_destroy_worker_stat("integral unshared stack", ru_isrss);
1220 moonbr_try_destroy_worker_stat("page replaims", ru_minflt);
1221 moonbr_try_destroy_worker_stat("page faults", ru_majflt);
1222 moonbr_try_destroy_worker_stat("swaps", ru_nswap);
1223 moonbr_try_destroy_worker_stat("block input operations", ru_inblock);
1224 moonbr_try_destroy_worker_stat("block output operations", ru_oublock);
1225 moonbr_try_destroy_worker_stat("messages sent", ru_msgsnd);
1226 moonbr_try_destroy_worker_stat("messages received", ru_msgrcv);
1227 moonbr_try_destroy_worker_stat("signals received", ru_nsignals);
1228 moonbr_try_destroy_worker_stat("voluntary context switches", ru_nvcsw);
1229 moonbr_try_destroy_worker_stat("involuntary context switches", ru_nivcsw);
1233 int retval = (
1234 (worker->idle || worker->assigned) ?
1235 MOONBR_DESTROY_IDLE_OR_ASSIGNED :
1236 MOONBR_DESTROY_PREPARE
1237 );
1238 if (worker->main && !moonbr_shutdown_in_progress) moonbr_initiate_shutdown();
1239 if (worker->prev_worker) worker->prev_worker->next_worker = worker->next_worker;
1240 else worker->pool->first_worker = worker->next_worker;
1241 if (worker->next_worker) worker->next_worker->prev_worker = worker->prev_worker;
1242 else worker->pool->last_worker = worker->prev_worker;
1243 if (worker->idle) {
1244 if (worker->prev_idle_worker) worker->prev_idle_worker->next_idle_worker = worker->next_idle_worker;
1245 else worker->pool->first_idle_worker = worker->next_idle_worker;
1246 if (worker->next_idle_worker) worker->next_idle_worker->prev_idle_worker = worker->prev_idle_worker;
1247 else worker->pool->last_idle_worker = worker->prev_idle_worker;
1248 worker->pool->idle_worker_count--;
1250 if (!worker->assigned) worker->pool->unassigned_worker_count--;
1251 worker->pool->total_worker_count--;
1252 worker->pool->worker_count_stat = 1;
1253 if (worker->errorlinebuf) free(worker->errorlinebuf);
1254 free(worker);
1255 return retval;
1259 /* Marks a worker as idle and stores it in a queue, optionally setting 'idle_expiration' value */
1260 static void moonbr_add_idle_worker(struct moonbr_worker *worker) {
1261 worker->prev_idle_worker = worker->pool->last_idle_worker;
1262 if (worker->prev_idle_worker) worker->prev_idle_worker->next_idle_worker = worker;
1263 else worker->pool->first_idle_worker = worker;
1264 worker->pool->last_idle_worker = worker;
1265 worker->idle = 1;
1266 worker->pool->idle_worker_count++;
1267 if (worker->assigned) {
1268 worker->assigned = 0;
1269 worker->pool->unassigned_worker_count++;
1271 worker->pool->worker_count_stat = 1;
1272 if (timerisset(&worker->pool->idle_timeout)) {
1273 struct timeval now;
1274 moonbr_now(&now);
1275 timeradd(&now, &worker->pool->idle_timeout, &worker->idle_expiration);
1279 /* Pops a worker from the queue of idle workers (idle queue must not be empty) */
1280 static struct moonbr_worker *moonbr_pop_idle_worker(struct moonbr_pool *pool) {
1281 struct moonbr_worker *worker;
1282 worker = pool->first_idle_worker;
1283 pool->first_idle_worker = worker->next_idle_worker;
1284 if (pool->first_idle_worker) pool->first_idle_worker->prev_idle_worker = NULL;
1285 else pool->last_idle_worker = NULL;
1286 worker->next_idle_worker = NULL;
1287 worker->idle = 0;
1288 worker->pool->idle_worker_count--;
1289 worker->assigned = 1;
1290 worker->pool->unassigned_worker_count--;
1291 worker->pool->worker_count_stat = 1;
1292 return worker;
1296 /*** Functions to communicate with child processes ***/
1298 /* Tells child process to terminate */
1299 static void moonbr_terminate_idle_worker(struct moonbr_worker *worker) {
1300 moonbr_send_control_message(worker, MOONBR_COMMAND_TERMINATE, -1, NULL);
1303 /* Handles status messages from child process */
1304 static void moonbr_read_controlchannel(struct moonbr_worker *worker) {
1305 char controlmsg;
1307 ssize_t bytes_read;
1308 while ((bytes_read = read(worker->controlfd, &controlmsg, 1)) <= 0) {
1309 if (bytes_read == 0 || errno == ECONNRESET) {
1310 moonbr_log(LOG_WARNING, "Child process in pool #%i with PID %i unexpectedly closed control socket", worker->pool->poolnum, (int)worker->pid);
1311 if (close(worker->controlfd) && errno != EINTR) {
1312 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));
1313 moonbr_terminate_error();
1315 worker->controlfd = -1;
1316 moonbr_poll_refresh_needed = 1;
1317 return;
1319 if (errno != EINTR) {
1320 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));
1321 moonbr_terminate_error();
1325 if (worker->idle) {
1326 moonbr_log(LOG_CRIT, "Unexpected data from supposedly idle child process in pool #%i with PID %i", worker->pool->poolnum, (int)worker->pid);
1327 moonbr_terminate_error();
1329 if (moonbr_debug) {
1330 moonbr_log(LOG_DEBUG, "Received control message from child in pool #%i with PID %i: \"%c\"", worker->pool->poolnum, (int)worker->pid, (int)controlmsg);
1332 switch (controlmsg) {
1333 case MOONBR_STATUS_IDLE:
1334 if (moonbr_stat) {
1335 moonbr_log(LOG_INFO, "Child process in pool #%i with PID %i reports as idle", worker->pool->poolnum, (int)worker->pid);
1337 moonbr_add_idle_worker(worker);
1338 break;
1339 case MOONBR_STATUS_GOODBYE:
1340 if (moonbr_stat) {
1341 moonbr_log(LOG_INFO, "Child process in pool #%i with PID %i announced termination", worker->pool->poolnum, (int)worker->pid);
1343 if (close(worker->controlfd) && errno != EINTR) {
1344 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));
1345 moonbr_terminate_error();
1347 worker->controlfd = -1;
1348 moonbr_poll_refresh_needed = 1;
1349 break;
1350 default:
1351 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);
1352 moonbr_terminate_error();
1356 /* Handles stderr stream from child process */
1357 static void moonbr_read_errorchannel(struct moonbr_worker *worker) {
1358 char staticbuf[MOONBR_MAXERRORLINELEN+1];
1359 char *buf = worker->errorlinebuf;
1360 if (!buf) buf = staticbuf;
1362 ssize_t bytes_read;
1363 while (
1364 (bytes_read = read(
1365 worker->errorfd,
1366 buf + worker->errorlinelen,
1367 MOONBR_MAXERRORLINELEN+1 - worker->errorlinelen
1368 )) <= 0
1369 ) {
1370 if (bytes_read == 0 || errno == ECONNRESET) {
1371 if (moonbr_debug) {
1372 moonbr_log(LOG_DEBUG, "Child process in pool #%i with PID %i closed stderr socket", worker->pool->poolnum, (int)worker->pid);
1374 if (close(worker->errorfd) && errno != EINTR) {
1375 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));
1376 moonbr_terminate_error();
1378 worker->errorfd = -1;
1379 moonbr_poll_refresh_needed = 1;
1380 break;
1382 if (errno != EINTR) {
1383 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));
1384 moonbr_terminate_error();
1387 worker->errorlinelen += bytes_read;
1390 int i;
1391 for (i=0; i<worker->errorlinelen; i++) {
1392 if (buf[i] == '\n') buf[i] = 0;
1393 if (!buf[i]) {
1394 if (worker->errorlineovf) {
1395 worker->errorlineovf = 0;
1396 } else {
1397 moonbr_log(LOG_WARNING, "[Pool #%i, PID %i] %s", worker->pool->poolnum, (int)worker->pid, buf);
1399 worker->errorlinelen -= i+1;
1400 memmove(buf, buf+i+1, worker->errorlinelen);
1401 i = -1;
1404 if (i > MOONBR_MAXERRORLINELEN) {
1405 buf[MOONBR_MAXERRORLINELEN] = 0;
1406 if (!worker->errorlineovf) {
1407 moonbr_log(LOG_WARNING, "[Pool #%i, PID %i](line has been truncated) %s", worker->pool->poolnum, (int)worker->pid, buf);
1409 worker->errorlinelen = 0;
1410 worker->errorlineovf = 1;
1413 if (!worker->errorlinebuf && worker->errorlinelen) { /* allocate buffer on heap only if necessary */
1414 worker->errorlinebuf = malloc((MOONBR_MAXERRORLINELEN+1) * sizeof(char));
1415 if (!worker->errorlinebuf) {
1416 moonbr_log(LOG_CRIT, "Memory allocation error");
1417 moonbr_terminate_error();
1419 memcpy(worker->errorlinebuf, staticbuf, worker->errorlinelen);
1424 /*** Handler for incoming connections ***/
1426 /* Accepts one or more incoming connections on listener socket and passes it to worker(s) popped from idle queue */
1427 static void moonbr_connect(struct moonbr_pool *pool) {
1428 struct moonbr_listener *listener = moonbr_pop_connected_listener(pool);
1429 struct moonbr_worker *worker;
1430 if (listener->proto == MOONBR_PROTO_INTERVAL) {
1431 worker = moonbr_pop_idle_worker(pool);
1432 if (listener->type_specific.interval.main) {
1433 if (moonbr_stat) {
1434 moonbr_log(LOG_INFO, "Dispatching main thread \"%s\" of pool #%i to PID %i", listener->type_specific.interval.name, listener->pool->poolnum, (int)worker->pid);
1436 worker->main = 1;
1437 } else {
1438 if (moonbr_stat) {
1439 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);
1441 worker->restart_interval_listener = listener;
1443 moonbr_send_control_message(worker, MOONBR_COMMAND_CONNECT, -1, listener);
1444 /* do not push listener to queue of idle listeners (yet) */
1445 } else {
1446 int peerfd;
1447 do {
1448 #if defined(__linux__) && !defined(_GNU_SOURCE)
1449 peerfd = accept(listener->listenfd, NULL, NULL);
1450 if (peerfd != -1) {
1451 if (fcntl(peerfd, F_SETFD, FD_CLOEXEC) == -1) {
1452 moonbr_log(LOG_ERR, "Error in fcntl() call: %s", strerror(errno));
1453 moonbr_terminate_error();
1456 #else
1457 peerfd = accept4(listener->listenfd, NULL, NULL, SOCK_CLOEXEC);
1458 #endif
1459 if (peerfd == -1) {
1460 if (errno == EWOULDBLOCK) {
1461 break;
1462 } else if (errno == ECONNABORTED) {
1463 moonbr_log(LOG_WARNING, "Connection aborted before accepting it");
1464 break;
1465 } else if (errno != EINTR) {
1466 moonbr_log(LOG_ERR, "Could not accept socket connection: %s", strerror(errno));
1467 moonbr_terminate_error();
1469 } else {
1470 worker = moonbr_pop_idle_worker(pool);
1471 if (moonbr_stat) {
1472 moonbr_log(LOG_INFO, "Dispatching connection for pool #%i to PID %i", listener->pool->poolnum, (int)worker->pid);
1474 moonbr_send_control_message(worker, MOONBR_COMMAND_CONNECT, peerfd, listener);
1475 if (close(peerfd) && errno != EINTR) {
1476 moonbr_log(LOG_ERR, "Could not close incoming socket connection in parent process: %s", strerror(errno));
1477 moonbr_terminate_error();
1480 } while (pool->first_idle_worker);
1481 moonbr_add_idle_listener(listener);
1486 /*** Functions to initialize and restart interval timers ***/
1488 /* Initializes all interval timers */
1489 static void moonbr_interval_initialize() {
1490 struct timeval now;
1491 struct moonbr_pool *pool;
1492 moonbr_now(&now);
1493 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
1494 int i;
1495 for (i=0; i<pool->listener_count; i++) {
1496 struct moonbr_listener *listener = &pool->listener[i];
1497 if (listener->proto == MOONBR_PROTO_INTERVAL) {
1498 timeradd(
1499 &now,
1500 &listener->type_specific.interval.delay,
1501 &listener->type_specific.interval.wakeup
1502 );
1508 /* If necessary, restarts interval timers and queues interval listener as idle after a worker changed status */
1509 static void moonbr_interval_restart(
1510 struct moonbr_worker *worker,
1511 struct timeval *now /* passed to synchronize with moonbr_run() function */
1512 ) {
1513 struct moonbr_listener *listener = worker->restart_interval_listener;
1514 if (listener) {
1515 moonbr_add_idle_listener(listener);
1516 worker->restart_interval_listener = NULL;
1517 if (listener->type_specific.interval.strict) {
1518 timeradd(
1519 &listener->type_specific.interval.wakeup,
1520 &listener->type_specific.interval.delay,
1521 &listener->type_specific.interval.wakeup
1522 );
1523 if (timercmp(&listener->type_specific.interval.wakeup, now, <)) {
1524 listener->type_specific.interval.wakeup = *now;
1526 } else {
1527 timeradd(
1528 now,
1529 &listener->type_specific.interval.delay,
1530 &listener->type_specific.interval.wakeup
1531 );
1537 /*** Main loop and helper functions ***/
1539 /* Stores the earliest required wakeup time in 'wait' variable */
1540 static void moonbr_calc_wait(struct timeval *wait, struct timeval *wakeup) {
1541 if (!timerisset(wait) || timercmp(wakeup, wait, <)) *wait = *wakeup;
1544 /* Main loop of Moonbridge system (including initialization of signal handlers and polling structures) */
1545 static void moonbr_run(lua_State *L) {
1546 struct timeval now;
1547 struct moonbr_pool *pool;
1548 struct moonbr_worker *worker;
1549 struct moonbr_worker *next_worker; /* needed when worker is removed during iteration of workers */
1550 struct moonbr_listener *listener;
1551 struct moonbr_listener *next_listener; /* needed when listener is removed during iteration of listeners */
1552 int i;
1553 moonbr_poll_init(); /* must be executed before moonbr_signal_init() */
1554 moonbr_signal_init();
1555 moonbr_interval_initialize();
1556 moonbr_pstate = MOONBR_PSTATE_RUNNING;
1557 while (1) {
1558 struct timeval wait = {0, }; /* point in time when premature wakeup of poll() is required */
1559 if (moonbr_cond_interrupt) {
1560 moonbr_log(LOG_WARNING, "Fast shutdown requested");
1561 moonbr_terminate(MOONBR_EXITCODE_GRACEFUL);
1563 if (moonbr_cond_terminate) {
1564 moonbr_initiate_shutdown();
1565 moonbr_cond_terminate = 0;
1567 moonbr_cond_child = 0; /* must not be reset between moonbr_try_destroy_worker() and poll() */
1568 moonbr_now(&now);
1569 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
1570 int terminated_worker_count = 0; /* allows shortcut for new worker creation */
1571 /* terminate idle workers when expired */
1572 if (timerisset(&pool->idle_timeout)) {
1573 while ((worker = pool->first_idle_worker) != NULL) {
1574 if (timercmp(&worker->idle_expiration, &now, >)) break;
1575 moonbr_pop_idle_worker(pool);
1576 moonbr_terminate_idle_worker(worker);
1579 /* mark listeners as connected when incoming connection is pending */
1580 for (listener=pool->first_idle_listener; listener; listener=next_listener) {
1581 next_listener = listener->next_listener; /* extra variable necessary due to changing list */
1582 if (listener->pollidx != -1) {
1583 if (moonbr_poll_fds[listener->pollidx].revents) {
1584 moonbr_poll_fds[listener->pollidx].revents = 0;
1585 moonbr_remove_idle_listener(listener);
1586 moonbr_add_connected_listener(listener);
1588 } else if (
1589 listener->proto != MOONBR_PROTO_INTERVAL ||
1590 !timercmp(&listener->type_specific.interval.wakeup, &now, >)
1591 ) {
1592 moonbr_remove_idle_listener(listener);
1593 moonbr_add_connected_listener(listener);
1596 /* process input from child processes */
1597 for (i=0; i<moonbr_poll_worker_count; i++) {
1598 if (moonbr_poll_worker_fds[i].revents) {
1599 moonbr_poll_worker_fds[i].revents = 0;
1600 struct moonbr_poll_worker *poll_worker = &moonbr_poll_workers[i];
1601 switch (poll_worker->channel) {
1602 case MOONBR_POLL_WORKER_CONTROLCHANNEL:
1603 moonbr_read_controlchannel(poll_worker->worker);
1604 moonbr_interval_restart(poll_worker->worker, &now);
1605 break;
1606 case MOONBR_POLL_WORKER_ERRORCHANNEL:
1607 moonbr_read_errorchannel(poll_worker->worker);
1608 break;
1612 /* collect dead child processes */
1613 for (worker=pool->first_worker; worker; worker=next_worker) {
1614 next_worker = worker->next_worker; /* extra variable necessary due to changing list */
1615 switch (moonbr_try_destroy_worker(worker)) {
1616 case MOONBR_DESTROY_PREPARE:
1617 pool->use_fork_error_wakeup = 1;
1618 break;
1619 case MOONBR_DESTROY_IDLE_OR_ASSIGNED:
1620 terminated_worker_count++;
1621 break;
1624 if (!moonbr_shutdown_in_progress) {
1625 /* connect listeners with idle workers */
1626 while (pool->first_connected_listener && pool->first_idle_worker) {
1627 moonbr_connect(pool);
1629 /* create new worker processes */
1630 while (
1631 pool->total_worker_count < pool->max_fork && (
1632 pool->unassigned_worker_count < pool->pre_fork ||
1633 pool->total_worker_count < pool->min_fork
1635 ) {
1636 if (pool->use_fork_error_wakeup) {
1637 if (timercmp(&pool->fork_error_wakeup, &now, >)) {
1638 moonbr_calc_wait(&wait, &pool->fork_error_wakeup);
1639 break;
1641 } else {
1642 if (terminated_worker_count) {
1643 terminated_worker_count--;
1644 } else if (timercmp(&pool->fork_wakeup, &now, >)) {
1645 moonbr_calc_wait(&wait, &pool->fork_wakeup);
1646 break;
1649 if (moonbr_create_worker(pool, L)) {
1650 /* on error, enforce error delay */
1651 timeradd(&now, &pool->fork_error_delay, &pool->fork_error_wakeup);
1652 pool->use_fork_error_wakeup = 1;
1653 moonbr_calc_wait(&wait, &pool->fork_error_wakeup);
1654 break;
1655 } else {
1656 /* normal fork delay on success */
1657 timeradd(&now, &pool->fork_delay, &pool->fork_wakeup);
1658 timeradd(&now, &pool->fork_error_delay, &pool->fork_error_wakeup);
1659 pool->use_fork_error_wakeup = 0; /* gets set later if error occures during preparation */
1662 /* terminate excessive worker processes */
1663 while (
1664 pool->total_worker_count > pool->min_fork &&
1665 pool->idle_worker_count > pool->pre_fork
1666 ) {
1667 if (timerisset(&pool->exit_wakeup)) {
1668 if (timercmp(&pool->exit_wakeup, &now, >)) {
1669 moonbr_calc_wait(&wait, &pool->exit_wakeup);
1670 break;
1672 moonbr_terminate_idle_worker(moonbr_pop_idle_worker(pool));
1673 timeradd(&now, &pool->exit_delay, &pool->exit_wakeup);
1674 } else {
1675 timeradd(&now, &pool->exit_delay, &pool->exit_wakeup);
1676 break;
1679 if (!(
1680 pool->total_worker_count > pool->min_fork &&
1681 pool->idle_worker_count > pool->pre_fork
1682 )) {
1683 timerclear(&pool->exit_wakeup); /* timer gets restarted later when there are excessive workers */
1686 /* optionally output worker count stats */
1687 if (moonbr_stat && pool->worker_count_stat) {
1688 pool->worker_count_stat = 0;
1689 moonbr_log(
1690 LOG_INFO,
1691 "Worker count for pool #%i: %i idle, %i assigned, %i total",
1692 pool->poolnum, pool->idle_worker_count,
1693 pool->total_worker_count - pool->unassigned_worker_count,
1694 pool->total_worker_count);
1696 /* calculate wakeup time for interval listeners */
1697 for (listener=pool->first_idle_listener; listener; listener=listener->next_listener) {
1698 if (listener->proto == MOONBR_PROTO_INTERVAL) {
1699 moonbr_calc_wait(&wait, &listener->type_specific.interval.wakeup);
1702 /* calculate wakeup time for idle workers (only first idle worker is significant) */
1703 if (timerisset(&pool->idle_timeout) && pool->first_idle_worker) {
1704 moonbr_calc_wait(&wait, &pool->first_idle_worker->idle_expiration);
1707 /* terminate idle workers in case of shutdown and check if shutdown is complete */
1708 if (moonbr_shutdown_in_progress) {
1709 int remaining = 0;
1710 for (pool=moonbr_first_pool; pool; pool=pool->next_pool) {
1711 while (pool->idle_worker_count) {
1712 moonbr_terminate_idle_worker(moonbr_pop_idle_worker(pool));
1714 if (pool->first_worker) remaining = 1;
1716 if (!remaining) {
1717 moonbr_log(LOG_INFO, "All worker threads have terminated");
1718 moonbr_terminate(MOONBR_EXITCODE_GRACEFUL);
1721 if (moonbr_poll_refresh_needed) moonbr_poll_refresh();
1722 moonbr_cond_poll = 1;
1723 if (!moonbr_cond_child && !moonbr_cond_terminate && !moonbr_cond_interrupt) {
1724 int timeout;
1725 if (timerisset(&wait)) {
1726 if (timercmp(&wait, &now, <)) {
1727 moonbr_log(LOG_CRIT, "Internal error (should not happen): Future is in the past");
1728 moonbr_terminate_error();
1730 timersub(&wait, &now, &wait);
1731 timeout = wait.tv_sec * 1000 + wait.tv_usec / 1000;
1732 } else {
1733 timeout = INFTIM;
1735 if (moonbr_debug) {
1736 moonbr_log(LOG_DEBUG, "Waiting for I/O");
1738 poll(moonbr_poll_fds, moonbr_poll_fds_count, timeout);
1739 } else {
1740 if (moonbr_debug) {
1741 moonbr_log(LOG_DEBUG, "Do not wait for I/O");
1744 moonbr_cond_poll = 0;
1745 moonbr_poll_reset_signal();
1750 /*** Lua interface ***/
1752 static int moonbr_lua_panic(lua_State *L) {
1753 const char *errmsg;
1754 errmsg = lua_tostring(L, -1);
1755 if (!errmsg) {
1756 if (lua_isnoneornil(L, -1)) errmsg = "(error message is nil)";
1757 else errmsg = "(error message is not a string)";
1759 if (moonbr_pstate == MOONBR_PSTATE_FORKED) {
1760 fprintf(stderr, "Uncaught Lua error: %s\n", errmsg);
1761 exit(1);
1762 } else {
1763 moonbr_log(LOG_CRIT, "Uncaught Lua error: %s", errmsg);
1764 moonbr_terminate_error();
1766 return 0;
1769 static int moonbr_addtraceback(lua_State *L) {
1770 luaL_traceback(L, L, luaL_tolstring(L, 1, NULL), 1);
1771 return 1;
1774 /* Memory allocator that allows limiting memory consumption */
1775 static void *moonbr_alloc (void *ud, void *ptr, size_t osize, size_t nsize) {
1776 (void)ud; /* not used */
1777 if (nsize == 0) {
1778 if (ptr) {
1779 moonbr_memory_usage -= osize;
1780 free(ptr);
1782 return NULL;
1783 } else if (ptr) {
1784 if (
1785 moonbr_memory_limit &&
1786 nsize > osize &&
1787 moonbr_memory_usage + (nsize - osize) > moonbr_memory_limit
1788 ) {
1789 return NULL;
1790 } else {
1791 ptr = realloc(ptr, nsize);
1792 if (ptr) moonbr_memory_usage += nsize - osize;
1794 } else {
1795 if (
1796 moonbr_memory_limit &&
1797 moonbr_memory_usage + nsize > moonbr_memory_limit
1798 ) {
1799 return NULL;
1800 } else {
1801 ptr = realloc(ptr, nsize);
1802 if (ptr) moonbr_memory_usage += nsize;
1805 return ptr;
1808 static int moonbr_lua_tonatural(lua_State *L, int idx) {
1809 int isnum;
1810 lua_Number n;
1811 n = lua_tonumberx(L, idx, &isnum);
1812 if (isnum && n>=0 && n<INT_MAX && (lua_Number)(int)n == n) return n;
1813 else return -1;
1816 static int moonbr_lua_totimeval(lua_State *L, int idx, struct timeval *value) {
1817 int isnum;
1818 lua_Number n;
1819 n = lua_tonumberx(L, idx, &isnum);
1820 if (isnum && n>=0 && n<=100000000) {
1821 value->tv_sec = n;
1822 value->tv_usec = 1e6 * (n - value->tv_sec);
1823 return 1;
1824 } else {
1825 return 0;
1829 static int moonbr_timeout(lua_State *L) {
1830 struct itimerval oldval;
1831 if (lua_isnoneornil(L, 1) && lua_isnoneornil(L, 2)) {
1832 getitimer(ITIMER_REAL, &oldval);
1833 } else {
1834 struct itimerval newval = {};
1835 timerclear(&newval.it_interval);
1836 timerclear(&newval.it_value);
1837 if (lua_toboolean(L, 1)) {
1838 luaL_argcheck(
1839 L, moonbr_lua_totimeval(L, 1, &newval.it_value), 1,
1840 "interval in seconds expected"
1841 );
1843 if (lua_isnoneornil(L, 2)) {
1844 if (setitimer(ITIMER_REAL, &newval, &oldval)) {
1845 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
1846 moonbr_terminate_error();
1848 } else {
1849 getitimer(ITIMER_REAL, &oldval);
1850 if (!timerisset(&oldval.it_value)) {
1851 if (setitimer(ITIMER_REAL, &newval, NULL)) {
1852 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
1853 moonbr_terminate_error();
1855 lua_call(L, lua_gettop(L) - 2, LUA_MULTRET);
1856 timerclear(&newval.it_value);
1857 if (setitimer(ITIMER_REAL, &newval, NULL)) {
1858 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
1859 moonbr_terminate_error();
1861 } else if (timercmp(&newval.it_value, &oldval.it_value, <)) {
1862 struct itimerval remval;
1863 if (setitimer(ITIMER_REAL, &newval, NULL)) {
1864 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
1865 moonbr_terminate_error();
1867 lua_call(L, lua_gettop(L) - 2, LUA_MULTRET);
1868 getitimer(ITIMER_REAL, &remval);
1869 timersub(&oldval.it_value, &newval.it_value, &newval.it_value);
1870 timeradd(&newval.it_value, &remval.it_value, &newval.it_value);
1871 if (setitimer(ITIMER_REAL, &newval, NULL)) {
1872 moonbr_log(LOG_CRIT, "Could not set ITIMER_REAL via setitimer()");
1873 moonbr_terminate_error();
1875 } else {
1876 lua_call(L, lua_gettop(L) - 2, LUA_MULTRET);
1878 return lua_gettop(L) - 1;
1881 lua_pushnumber(L, oldval.it_value.tv_sec + 1e-6 * oldval.it_value.tv_usec);
1882 return 1;
1885 #define moonbr_listen_init_pool_forkoption(luaname, cname, defval) do { \
1886 lua_getfield(L, 2, luaname); \
1887 pool->cname = lua_isnil(L, -1) ? (defval) : moonbr_lua_tonatural(L, -1); \
1888 } while(0)
1890 #define moonbr_listen_init_pool_timeoption(luaname, cname, defval, defvalu) ( \
1891 lua_getfield(L, 2, luaname), \
1892 lua_isnil(L, -1) ? ( \
1893 pool->cname.tv_sec = (defval), pool->cname.tv_usec = (defvalu), \
1894 1 \
1895 ) : ( \
1896 (lua_isboolean(L, -1) && !lua_toboolean(L, -1)) ? ( \
1897 pool->cname.tv_sec = 0, pool->cname.tv_usec = 0, \
1898 1 \
1899 ) : ( \
1900 moonbr_lua_totimeval(L, -1, &pool->cname) \
1901 ) \
1902 ) \
1905 static int moonbr_listen_init_pool(lua_State *L) {
1906 struct moonbr_pool *pool;
1907 const char *proto;
1908 int is_main;
1909 int i;
1910 int dynamic = 0; /* nonzero = listeners exist which require dynamic worker creation */
1911 pool = lua_touserdata(L, 1);
1912 for (i=0; i<pool->listener_count; i++) {
1913 struct moonbr_listener *listener = &pool->listener[i];
1914 lua_settop(L, 2);
1915 #if LUA_VERSION_NUM >= 503
1916 lua_geti(L, 2, i+1);
1917 #else
1918 lua_pushinteger(L, i+1);
1919 lua_gettable(L, 2);
1920 #endif
1921 lua_getfield(L, 3, "proto");
1922 proto = lua_tostring(L, -1);
1923 is_main = !strcmp(proto, "main");
1924 if (proto && (is_main || !strcmp(proto, "interval"))) {
1925 listener->proto = MOONBR_PROTO_INTERVAL;
1926 lua_getfield(L, 3, "name");
1928 const char *name = lua_tostring(L, -1);
1929 if (name) {
1930 char *name_dup = strdup(name);
1931 if (!name_dup) {
1932 moonbr_log(LOG_CRIT, "Memory allocation_error");
1933 moonbr_terminate_error();
1935 listener->type_specific.interval.name = name_dup;
1938 if (is_main) {
1939 listener->type_specific.interval.main = 1;
1940 } else {
1941 listener->type_specific.interval.main = 0;
1942 dynamic = 1;
1943 lua_getfield(L, 3, "delay");
1944 if (
1945 !moonbr_lua_totimeval(L, -1, &listener->type_specific.interval.delay) ||
1946 !timerisset(&listener->type_specific.interval.delay)
1947 ) {
1948 luaL_error(L, "No valid interval delay specified; use listen{{proto=\"interval\", delay=...}, ...}");
1950 lua_getfield(L, 3, "strict");
1951 if (!lua_isnil(L, -1)) {
1952 if (lua_isboolean(L, -1)) {
1953 if (lua_toboolean(L, -1)) listener->type_specific.interval.strict = 1;
1954 } else {
1955 luaL_error(L, "Option \"strict\" must be a boolean if set; use listen{{proto=\"interval\", strict=true, ...}, ...}");
1959 } else if (proto && !strcmp(proto, "local")) {
1960 const char *path;
1961 const int path_maxlen = (
1962 sizeof(listener->type_specific.socket.addr.addr_un) -
1963 ((void *)listener->type_specific.socket.addr.addr_un.sun_path - (void *)&listener->type_specific.socket.addr.addr_un)
1964 ) - 1; /* one byte for termination */
1965 dynamic = 1;
1966 listener->proto = MOONBR_PROTO_LOCAL;
1967 lua_getfield(L, 3, "path");
1968 path = lua_tostring(L, -1);
1969 if (!path) {
1970 luaL_error(L, "No valid path specified for local socket; use listen{{proto=\"local\", path=...}, ...}");
1972 if (strlen(path) > path_maxlen) {
1973 luaL_error(L, "Path name for local socket exceeded maximum length of %i characters", path_maxlen);
1975 listener->type_specific.socket.addr.addr_un.sun_family = AF_LOCAL;
1976 strcpy(listener->type_specific.socket.addr.addr_un.sun_path, path);
1977 listener->type_specific.socket.addrlen = sizeof(listener->type_specific.socket.addr.addr_un);
1978 } else if (proto && !strcmp(proto, "tcp")) {
1979 const char *host, *port;
1980 struct addrinfo hints = { 0, };
1981 struct addrinfo *res, *addrinfo;
1982 int errcode;
1983 const char *ip;
1984 dynamic = 1;
1985 lua_getfield(L, 3, "host");
1986 host = lua_isnil(L, -1) ? "::" : lua_tostring(L, -1);
1987 if (!host) {
1988 luaL_error(L, "No host specified; use listen{{proto=\"tcp\", host=...}, ...}");
1990 lua_getfield(L, 3, "port");
1991 port = lua_tostring(L, -1);
1992 if (!port) {
1993 luaL_error(L, "No port specified; use listen{{proto=\"tcp\", host=...}, ...}");
1995 hints.ai_family = AF_UNSPEC;
1996 hints.ai_socktype = SOCK_STREAM;
1997 hints.ai_protocol = IPPROTO_TCP;
1998 hints.ai_flags = AI_ADDRCONFIG | AI_PASSIVE;
1999 errcode = getaddrinfo(host, port, &hints, &res);
2000 if (errcode) {
2001 freeaddrinfo(res);
2002 if (errcode == EAI_SYSTEM) {
2003 char errmsg[MOONBR_MAXSTRERRORLEN] = MOONBR_STRERROR_R_MSG;
2004 strerror_r(errno, errmsg, MOONBR_MAXSTRERRORLEN); /* use thread-safe call in case child created threads */
2005 luaL_error(L, "Could not resolve host: %s: %s", gai_strerror(errcode), errmsg);
2006 } else {
2007 luaL_error(L, "Could not resolve host: %s", gai_strerror(errcode));
2010 for (addrinfo=res; addrinfo; addrinfo=addrinfo->ai_next) {
2011 if (addrinfo->ai_family == AF_INET6) goto moonbr_listen_init_pool_found;
2013 for (addrinfo=res; addrinfo; addrinfo=addrinfo->ai_next) {
2014 if (addrinfo->ai_family == AF_INET) goto moonbr_listen_init_pool_found;
2016 addrinfo = res;
2017 moonbr_listen_init_pool_found:
2018 if (addrinfo->ai_addrlen > sizeof(listener->type_specific.socket.addr)) {
2019 moonbr_log(LOG_CRIT, "Size of ai_addrlen is unexpectedly big (should not happen)");
2020 moonbr_terminate_error();
2022 memcpy(&listener->type_specific.socket.addr, addrinfo->ai_addr, addrinfo->ai_addrlen);
2023 listener->type_specific.socket.addrlen = addrinfo->ai_addrlen;
2024 switch (addrinfo->ai_family) {
2025 case AF_INET6:
2026 ip = inet_ntop(
2027 addrinfo->ai_family,
2028 &((struct sockaddr_in6 *)addrinfo->ai_addr)->sin6_addr,
2029 listener->proto_specific.tcp.ip,
2030 INET6_ADDRSTRLEN
2031 );
2032 if (!ip) {
2033 moonbr_log(LOG_CRIT, "System error in inet_ntop call: %s", strerror(errno));
2034 moonbr_terminate_error();
2036 listener->proto_specific.tcp.port = ntohs(((struct sockaddr_in6 *)addrinfo->ai_addr)->sin6_port);
2037 break;
2038 case AF_INET:
2039 ip = inet_ntop(
2040 addrinfo->ai_family,
2041 &((struct sockaddr_in *)addrinfo->ai_addr)->sin_addr,
2042 listener->proto_specific.tcp.ip,
2043 INET_ADDRSTRLEN
2044 );
2045 if (!ip) {
2046 moonbr_log(LOG_CRIT, "System error in inet_ntop call: %s", strerror(errno));
2047 moonbr_terminate_error();
2049 listener->proto_specific.tcp.port = ntohs(((struct sockaddr_in *)addrinfo->ai_addr)->sin_port);
2050 break;
2051 default:
2052 strcpy(listener->proto_specific.tcp.ip, "unknown");
2053 listener->proto_specific.tcp.port = 0;
2055 listener->proto = MOONBR_PROTO_TCP;
2056 } else if (proto) {
2057 luaL_error(L, "Unknown protocol \"%s\"", proto);
2058 } else {
2059 luaL_error(L, "No valid protocol specified; use listen{{proto=..., ...}, ...}");
2062 lua_settop(L, 2);
2063 if (dynamic) {
2064 moonbr_listen_init_pool_forkoption("pre_fork", pre_fork, 1);
2065 moonbr_listen_init_pool_forkoption("min_fork", min_fork, pool->pre_fork > 2 ? pool->pre_fork : 2);
2066 moonbr_listen_init_pool_forkoption("max_fork", max_fork, pool->min_fork > 16 ? pool->min_fork : 16);
2067 if (!moonbr_listen_init_pool_timeoption("fork_delay", fork_delay, 0, 250000)) {
2068 luaL_error(L, "Option \"fork_delay\" is expected to be a non-negative number");
2070 if (!moonbr_listen_init_pool_timeoption("fork_error_delay", fork_error_delay, 2, 0)) {
2071 luaL_error(L, "Option \"fork_error_delay\" is expected to be a non-negative number");
2073 if (!moonbr_listen_init_pool_timeoption("exit_delay", exit_delay, 60, 0)) {
2074 luaL_error(L, "Option \"exit_delay\" is expected to be a non-negative number");
2076 if (timercmp(&pool->fork_error_delay, &pool->fork_delay, <)) {
2077 pool->fork_error_delay = pool->fork_delay;
2079 if (!moonbr_listen_init_pool_timeoption("idle_timeout", idle_timeout, 0, 0)) {
2080 luaL_error(L, "Option \"idle_timeout\" is expected to be a non-negative number");
2082 } else {
2083 pool->pre_fork = 0;
2084 pool->min_fork = pool->listener_count;
2085 pool->max_fork = pool->listener_count;
2087 lua_getfield(L, 2, "memory_limit");
2088 if (!lua_isnil(L, -1)) {
2089 int isnum;
2090 lua_Number n;
2091 n = lua_tonumberx(L, -1, &isnum);
2092 if (n < 0 || !isnum) {
2093 luaL_error(L, "Option \"memory_limit\" is expected to be a non-negative number");
2095 pool->memory_limit = n;
2097 lua_settop(L, 2);
2098 lua_getfield(L, 2, "prepare");
2099 if (!lua_isnil(L, -1) && !lua_isfunction(L, -1)) {
2100 luaL_error(L, "Option \"prepare\" must be nil or a function");
2102 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_prepare_func(pool));
2103 lua_getfield(L, 2, "connect");
2104 if (!lua_isfunction(L, -1)) {
2105 luaL_error(L, "Option \"connect\" must be a function; use listen{{...}, {...}, connect=function(socket) ... end, ...}");
2107 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_connect_func(pool));
2108 lua_getfield(L, 2, "finish");
2109 if (!lua_isnil(L, -1) && !lua_isfunction(L, -1)) {
2110 luaL_error(L, "Option \"finish\" must be nil or a function");
2112 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_finish_func(pool));
2113 return 0;
2116 static int moonbr_listen(lua_State *L) {
2117 struct moonbr_pool *pool;
2118 lua_Integer listener_count;
2119 if (moonbr_booted) luaL_error(L, "Moonbridge bootup is already complete");
2120 luaL_checktype(L, 1, LUA_TTABLE);
2121 listener_count = luaL_len(L, 1);
2122 if (!listener_count) luaL_error(L, "No listen ports specified; use listen{{proto=..., port=...},...}");
2123 if (listener_count > 100) luaL_error(L, "Too many listeners");
2124 pool = moonbr_create_pool(listener_count);
2125 lua_pushcfunction(L, moonbr_listen_init_pool);
2126 lua_pushlightuserdata(L, pool);
2127 lua_pushvalue(L, 1);
2128 if (lua_pcall(L, 2, 0, 0)) goto moonbr_listen_error;
2130 int i;
2131 i = moonbr_start_pool(pool);
2132 if (i >= 0) {
2133 lua_pushfstring(L, "Could not initialize listener #%d: %s", i+1, strerror(errno));
2134 moonbr_listen_error:
2135 moonbr_destroy_pool(pool);
2136 lua_pushnil(L);
2137 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_prepare_func(pool));
2138 lua_pushnil(L);
2139 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_connect_func(pool));
2140 lua_pushnil(L);
2141 lua_rawsetp(L, LUA_REGISTRYINDEX, moonbr_luakey_finish_func(pool));
2142 lua_error(L);
2145 return 0;
2149 /*** Function to modify Lua's library path and/or cpath ***/
2151 #if defined(MOONBR_LUA_PATH) || defined(MOONBR_LUA_CPATH)
2152 static void moonbr_modify_path(lua_State *L, char *key, char *value) {
2153 int stackbase;
2154 stackbase = lua_gettop(L);
2155 lua_getglobal(L, "package");
2156 lua_getfield(L, stackbase+1, key);
2158 const char *current_str;
2159 size_t current_strlen;
2160 luaL_Buffer buf;
2161 current_str = lua_tolstring(L, stackbase+2, &current_strlen);
2162 luaL_buffinit(L, &buf);
2163 if (current_str) {
2164 lua_pushvalue(L, stackbase+2);
2165 luaL_addvalue(&buf);
2166 if (current_strlen && current_str[current_strlen-1] != ';') {
2167 luaL_addchar(&buf, ';');
2170 luaL_addstring(&buf, value);
2171 luaL_pushresult(&buf);
2173 lua_setfield(L, stackbase+1, key);
2174 lua_settop(L, stackbase);
2176 #endif
2179 /*** Main function and command line invokation ***/
2181 static void moonbr_usage(int err, const char *cmd) {
2182 FILE *out;
2183 out = err ? stderr : stdout;
2184 if (!cmd) cmd = "moonbridge";
2185 fprintf(out, "Get this help message: %s {-h|--help}\n", cmd);
2186 fprintf(out, "Usage: %s \\\n", cmd);
2187 fprintf(out, " [-b|--background] \\\n");
2188 fprintf(out, " [-d|--debug] \\\n");
2189 fprintf(out, " [-f|--logfacility {DAEMON|USER|0|1|...|7}] \\\n");
2190 fprintf(out, " [-i|--logident <syslog ident> \\\n");
2191 fprintf(out, " [-l|--logfile <logfile>] \\\n");
2192 fprintf(out, " [-p|--pidfile <pidfile>] \\\n");
2193 fprintf(out, " [-s|--stats] \\\n");
2194 fprintf(out, " -- <Lua script> [<cmdline options for Lua script>]\n");
2195 exit(err);
2198 #define moonbr_usage_error() moonbr_usage(MOONBR_EXITCODE_CMDLINEERROR, argc ? argv[0] : NULL)
2200 int main(int argc, char **argv) {
2202 int daemonize = 0;
2203 int log_facility = LOG_USER;
2204 const char *log_ident = "moonbridge";
2205 const char *log_filename = NULL;
2206 const char *pid_filename = NULL;
2207 int option;
2208 struct option longopts[] = {
2209 { "background", no_argument, NULL, 'b' },
2210 { "debug", no_argument, NULL, 'd' },
2211 { "logfacility", required_argument, NULL, 'f' },
2212 { "help", no_argument, NULL, 'h' },
2213 { "logident", required_argument, NULL, 'i' },
2214 { "logfile", required_argument, NULL, 'l' },
2215 { "pidfile", required_argument, NULL, 'p' },
2216 { "stats", no_argument, NULL, 's' },
2217 { NULL, 0, NULL, 0 }
2218 };
2219 while ((option = getopt_long(argc, argv, "bdf:hi:l:p:s", longopts, NULL)) != -1) {
2220 switch (option) {
2221 case 'b':
2222 daemonize = 1;
2223 break;
2224 case 'd':
2225 moonbr_debug = 1;
2226 moonbr_stat = 1;
2227 break;
2228 case 'f':
2229 if (!strcmp(optarg, "DAEMON")) {
2230 log_facility = LOG_DAEMON;
2231 } else if (!strcmp(optarg, "USER")) {
2232 log_facility = LOG_USER;
2233 } else if (!strcmp(optarg, "0")) {
2234 log_facility = LOG_LOCAL0;
2235 } else if (!strcmp(optarg, "1")) {
2236 log_facility = LOG_LOCAL1;
2237 } else if (!strcmp(optarg, "2")) {
2238 log_facility = LOG_LOCAL2;
2239 } else if (!strcmp(optarg, "3")) {
2240 log_facility = LOG_LOCAL3;
2241 } else if (!strcmp(optarg, "4")) {
2242 log_facility = LOG_LOCAL4;
2243 } else if (!strcmp(optarg, "5")) {
2244 log_facility = LOG_LOCAL5;
2245 } else if (!strcmp(optarg, "6")) {
2246 log_facility = LOG_LOCAL6;
2247 } else if (!strcmp(optarg, "7")) {
2248 log_facility = LOG_LOCAL7;
2249 } else {
2250 moonbr_usage_error();
2252 moonbr_use_syslog = 1;
2253 break;
2254 case 'h':
2255 moonbr_usage(MOONBR_EXITCODE_GRACEFUL, argv[0]);
2256 break;
2257 case 'i':
2258 log_ident = optarg;
2259 moonbr_use_syslog = 1;
2260 break;
2261 case 'l':
2262 log_filename = optarg;
2263 break;
2264 case 'p':
2265 pid_filename = optarg;
2266 break;
2267 case 's':
2268 moonbr_stat = 1;
2269 break;
2270 default:
2271 moonbr_usage_error();
2274 if (argc - optind < 1) moonbr_usage_error();
2275 if (pid_filename) {
2276 pid_t otherpid;
2277 while ((moonbr_pidfh = pidfile_open(pid_filename, 0644, &otherpid)) == NULL) {
2278 if (errno == EEXIST) {
2279 if (otherpid == -1) {
2280 fprintf(stderr, "PID file \"%s\" is already locked\n", pid_filename);
2281 } else {
2282 fprintf(stderr, "PID file \"%s\" is already locked by process with PID: %i\n", pid_filename, (int)otherpid);
2284 exit(MOONBR_EXITCODE_ALREADYRUNNING);
2285 } else if (errno != EINTR) {
2286 fprintf(stderr, "Could not write PID file \"%s\": %s\n", pid_filename, strerror(errno));
2287 exit(MOONBR_EXITCODE_STARTUPERROR);
2291 if (log_filename) {
2292 int logfd;
2293 while (
2294 ( logfd = flopen(
2295 log_filename,
2296 O_WRONLY|O_NONBLOCK|O_CREAT|O_APPEND|O_CLOEXEC,
2297 0640
2299 ) < 0
2300 ) {
2301 if (errno == EWOULDBLOCK) {
2302 fprintf(stderr, "Logfile \"%s\" is locked\n", log_filename);
2303 exit(MOONBR_EXITCODE_ALREADYRUNNING);
2304 } else if (errno != EINTR) {
2305 fprintf(stderr, "Could not open logfile \"%s\": %s\n", log_filename, strerror(errno));
2306 exit(MOONBR_EXITCODE_STARTUPERROR);
2309 moonbr_logfile = fdopen(logfd, "a");
2310 if (!moonbr_logfile) {
2311 fprintf(stderr, "Could not open write stream to logfile \"%s\": %s\n", log_filename, strerror(errno));
2312 exit(MOONBR_EXITCODE_STARTUPERROR);
2315 if (daemonize == 0 && !moonbr_logfile) moonbr_logfile = stderr;
2316 if (moonbr_logfile) setlinebuf(moonbr_logfile);
2317 else moonbr_use_syslog = 1;
2318 if (moonbr_use_syslog) openlog(log_ident, LOG_NDELAY | LOG_PID, log_facility);
2319 if (daemonize) {
2320 if (daemon(1, 0)) {
2321 moonbr_log(LOG_ERR, "Could not daemonize moonbridge process");
2322 moonbr_terminate_error();
2326 moonbr_log(LOG_NOTICE, "Starting moonbridge server");
2327 if (moonbr_pidfh && pidfile_write(moonbr_pidfh)) {
2328 moonbr_log(LOG_ERR, "Could not write pidfile (after locking)");
2331 lua_State *L;
2332 L = lua_newstate(moonbr_alloc, NULL);
2333 if (!L) {
2334 moonbr_log(LOG_CRIT, "Could not initialize Lua state");
2335 moonbr_terminate_error();
2337 lua_atpanic(L, moonbr_lua_panic);
2338 lua_pushliteral(L, MOONBR_VERSION_STRING);
2339 lua_setglobal(L, "_MOONBRIDGE_VERSION");
2340 luaL_openlibs(L);
2341 luaL_requiref(L, "moonbridge_io", luaopen_moonbridge_io, 1);
2342 lua_pop(L, 1);
2343 #ifdef MOONBR_LUA_PATH
2344 moonbr_modify_path(L, "path", MOONBR_LUA_PATH);
2345 #endif
2346 #ifdef MOONBR_LUA_CPATH
2347 moonbr_modify_path(L, "cpath", MOONBR_LUA_CPATH);
2348 #endif
2349 lua_pushcfunction(L, moonbr_timeout);
2350 lua_setglobal(L, "timeout");
2351 lua_pushcfunction(L, moonbr_listen);
2352 lua_setglobal(L, "listen");
2353 lua_pushcfunction(L, moonbr_addtraceback); /* on stack position 1 */
2354 moonbr_log(LOG_INFO, "Loading \"%s\"", argv[optind]);
2355 if (luaL_loadfile(L, argv[optind])) {
2356 moonbr_log(LOG_ERR, "Error while loading \"%s\": %s", argv[optind], lua_tostring(L, -1));
2357 moonbr_terminate_error();
2359 { int i; for (i=optind+1; i<argc; i++) lua_pushstring(L, argv[i]); }
2360 if (lua_pcall(L, argc-(optind+1), 0, 1)) {
2361 moonbr_log(LOG_ERR, "Error while executing \"%s\": %s", argv[optind], lua_tostring(L, -1));
2362 moonbr_terminate_error();
2364 if (!moonbr_first_pool) {
2365 moonbr_log(LOG_WARNING, "No listener initialized.");
2366 moonbr_terminate_error();
2368 lua_getglobal(L, "listen");
2369 lua_pushcfunction(L, moonbr_listen);
2370 if (lua_compare(L, -2, -1, LUA_OPEQ)) {
2371 lua_pushnil(L);
2372 lua_setglobal(L, "listen");
2374 lua_settop(L, 1);
2375 lua_gc(L, LUA_GCCOLLECT, 0); /* collect garbage before forking later */
2376 moonbr_run(L);
2378 return 0;

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