2 process.c -- process management functions
3 Copyright (C) 1999-2003 Ivo Timmermans <ivo@o2w.nl>,
4 2000-2003 Guus Sliepen <guus@sliepen.eu.org>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 $Id: process.c,v 1.1.2.58 2003/07/28 22:06:09 guus Exp $
26 #include "connection.h"
37 /* If zero, don't detach from the terminal. */
38 bool do_detach = true;
42 extern char *identname;
43 extern char *pidfilename;
45 extern bool use_logfile;
49 static int saved_debug_level = -1;
51 static void memory_full(int size)
53 logger(LOG_ERR, _("Memory exhausted (couldn't allocate %d bytes), exitting."), size);
58 /* Some functions the less gifted operating systems might lack... */
60 #ifndef HAVE_FCLOSEALL
61 static int fcloseall(void)
74 Close network connections, and terminate neatly
76 void cleanup_and_exit(int c)
80 close_network_connections();
85 logger(LOG_NOTICE, _("Terminating"));
93 check for an existing tinc for this net, and write pid to pidfile
95 static bool write_pidfile(void)
101 pid = check_pid(pidfilename);
105 fprintf(stderr, _("A tincd is already running for net `%s' with pid %d.\n"),
108 fprintf(stderr, _("A tincd is already running with pid %d.\n"), pid);
112 /* if it's locked, write-protected, or whatever */
113 if(!write_pid(pidfilename))
121 kill older tincd for this net
123 bool kill_other(int signal)
130 pid = read_pid(pidfilename);
134 fprintf(stderr, _("No other tincd is running for net `%s'.\n"),
137 fprintf(stderr, _("No other tincd is running.\n"));
141 errno = 0; /* No error, sometimes errno is only changed on error */
143 /* ESRCH is returned when no process with that pid is found */
144 if(kill(pid, signal) && errno == ESRCH) {
146 fprintf(stderr, _("The tincd for net `%s' is no longer running. "),
149 fprintf(stderr, _("The tincd is no longer running. "));
151 fprintf(stderr, _("Removing stale lock file.\n"));
152 remove_pid(pidfilename);
160 Detach from current terminal, write pidfile, kill parent
168 /* First check if we can open a fresh new pidfile */
175 /* If we succeeded in doing that, detach */
182 fprintf(stderr, _("Couldn't detach from terminal: %s"),
187 /* Now UPDATE the pid in the pidfile, because we changed it... */
189 if(!write_pid(pidfilename))
194 openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
196 logger(LOG_NOTICE, _("tincd %s (%s %s) starting, debug level %d"),
197 VERSION, __DATE__, __TIME__, debug_level);
199 xalloc_fail_func = memory_full;
206 Execute the program name, with sane environment.
208 static void _execute_script(const char *scriptname, char **envp)
209 __attribute__ ((noreturn));
210 static void _execute_script(const char *scriptname, char **envp)
223 /* Close all file descriptors */
226 execl(scriptname, NULL);
227 /* No return on success */
231 openlogger(identname, use_logfile?LOGMODE_FILE:(do_detach?LOGMODE_SYSLOG:LOGMODE_STDERR));
232 logger(LOG_ERR, _("Could not execute `%s': %s"), scriptname,
233 strerror(save_errno));
239 Fork and execute the program pointed to by name.
241 bool execute_script(const char *name, char **envp)
251 asprintf(&scriptname, "%s/%s", confbase, name);
253 /* First check if there is a script */
255 if(stat(scriptname, &s))
261 logger(LOG_ERR, _("System call `%s' failed: %s"), "fork",
267 ifdebug(STATUS) logger(LOG_INFO, _("Executing script %s"), name);
271 if(waitpid(pid, &status, 0) == pid) {
272 if(WIFEXITED(status)) { /* Child exited by itself */
273 if(WEXITSTATUS(status)) {
274 logger(LOG_ERR, _("Process %d (%s) exited with non-zero status %d"),
275 pid, name, WEXITSTATUS(status));
279 } else if(WIFSIGNALED(status)) { /* Child was killed by a signal */
280 logger(LOG_ERR, _("Process %d (%s) was killed by signal %d (%s)"), pid,
281 name, WTERMSIG(status), strsignal(WTERMSIG(status)));
283 } else { /* Something strange happened */
284 logger(LOG_ERR, _("Process %d (%s) terminated abnormally"), pid,
288 } else if (errno != EINTR) {
289 logger(LOG_ERR, _("System call `%s' failed: %s"), "waitpid",
294 /* Why do we get EINTR? */
300 _execute_script(scriptname, envp);
312 static RETSIGTYPE sigterm_handler(int a)
314 logger(LOG_NOTICE, _("Got TERM signal"));
319 static RETSIGTYPE sigquit_handler(int a)
321 logger(LOG_NOTICE, _("Got QUIT signal"));
325 static RETSIGTYPE fatal_signal_square(int a)
327 logger(LOG_ERR, _("Got another fatal signal %d (%s): not restarting."), a,
333 static RETSIGTYPE fatal_signal_handler(int a)
335 struct sigaction act;
336 logger(LOG_ERR, _("Got fatal signal %d (%s)"), a, strsignal(a));
340 logger(LOG_NOTICE, _("Trying to re-execute in 5 seconds..."));
342 act.sa_handler = fatal_signal_square;
343 act.sa_mask = emptysigset;
345 sigaction(SIGSEGV, &act, NULL);
347 close_network_connections();
349 remove_pid(pidfilename);
350 execvp(g_argv[0], g_argv);
352 logger(LOG_NOTICE, _("Not restarting."));
357 static RETSIGTYPE sighup_handler(int a)
359 logger(LOG_NOTICE, _("Got HUP signal"));
363 static RETSIGTYPE sigint_handler(int a)
365 if(saved_debug_level != -1) {
366 logger(LOG_NOTICE, _("Reverting to old debug level (%d)"),
368 debug_level = saved_debug_level;
369 saved_debug_level = -1;
372 _("Temporarily setting debug level to 5. Kill me with SIGINT again to go back to level %d."),
374 saved_debug_level = debug_level;
379 static RETSIGTYPE sigalrm_handler(int a)
381 logger(LOG_NOTICE, _("Got ALRM signal"));
385 static RETSIGTYPE sigusr1_handler(int a)
390 static RETSIGTYPE sigusr2_handler(int a)
398 static RETSIGTYPE sigwinch_handler(int a)
403 static RETSIGTYPE unexpected_signal_handler(int a)
405 logger(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
409 static RETSIGTYPE ignore_signal_handler(int a)
411 ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Ignored signal %d (%s)"), a, strsignal(a));
416 void (*handler)(int);
418 {SIGHUP, sighup_handler},
419 {SIGTERM, sigterm_handler},
420 {SIGQUIT, sigquit_handler},
421 {SIGSEGV, fatal_signal_handler},
422 {SIGBUS, fatal_signal_handler},
423 {SIGILL, fatal_signal_handler},
424 {SIGPIPE, ignore_signal_handler},
425 {SIGINT, sigint_handler},
426 {SIGUSR1, sigusr1_handler},
427 {SIGUSR2, sigusr2_handler},
428 {SIGCHLD, ignore_signal_handler},
429 {SIGALRM, sigalrm_handler},
430 {SIGWINCH, sigwinch_handler},
435 void setup_signals(void)
439 struct sigaction act;
441 sigemptyset(&emptysigset);
442 act.sa_handler = NULL;
443 act.sa_mask = emptysigset;
446 /* Set a default signal handler for every signal, errors will be
448 for(i = 0; i < NSIG; i++) {
450 act.sa_handler = SIG_DFL;
452 act.sa_handler = unexpected_signal_handler;
453 sigaction(i, &act, NULL);
456 /* If we didn't detach, allow coredumps */
458 sighandlers[3].handler = SIG_DFL;
460 /* Then, for each known signal that we want to catch, assign a
461 handler to the signal, with error checking this time. */
462 for(i = 0; sighandlers[i].signal; i++) {
463 act.sa_handler = sighandlers[i].handler;
464 if(sigaction(sighandlers[i].signal, &act, NULL) < 0)
465 fprintf(stderr, _("Installing signal handler for signal %d (%s) failed: %s\n"),
466 sighandlers[i].signal, strsignal(sighandlers[i].signal),