2 process.c -- process management functions
3 Copyright (C) 1999-2002 Ivo Timmermans <itimmermans@bigfoot.com>,
4 2000-2002 Guus Sliepen <guus@sliepen.warande.net>
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 1.1.2.33 2002/02/10 21:57:54 guus Exp $
31 #include <sys/ioctl.h>
32 #include <sys/types.h>
46 #include "connection.h"
51 /* If zero, don't detach from the terminal. */
54 extern char *identname;
55 extern char *pidfilename;
60 static int saved_debug_lvl = 0;
66 void memory_full(int size)
68 syslog(LOG_ERR, _("Memory exhausted (couldn't allocate %d bytes), exiting."), size);
73 /* Some functions the less gifted operating systems might lack... */
75 #ifndef HAVE_FCLOSEALL
88 Close network connections, and terminate neatly
90 void cleanup_and_exit(int c)
93 close_network_connections();
95 if(debug_lvl > DEBUG_NOTHING)
98 syslog(LOG_NOTICE, _("Terminating"));
105 check for an existing tinc for this net, and write pid to pidfile
107 int write_pidfile(void)
111 if((pid = check_pid(pidfilename)))
114 fprintf(stderr, _("A tincd is already running for net `%s' with pid %d.\n"),
117 fprintf(stderr, _("A tincd is already running with pid %d.\n"), pid);
121 /* if it's locked, write-protected, or whatever */
122 if(!write_pid(pidfilename))
129 kill older tincd for this net
131 int kill_other(int signal)
135 if(!(pid = read_pid(pidfilename)))
138 fprintf(stderr, _("No other tincd is running for net `%s'.\n"), netname);
140 fprintf(stderr, _("No other tincd is running.\n"));
144 errno = 0; /* No error, sometimes errno is only changed on error */
145 /* ESRCH is returned when no process with that pid is found */
146 if(kill(pid, signal) && errno == ESRCH)
147 fprintf(stderr, _("Removing stale lock file.\n"));
148 remove_pid(pidfilename);
154 Detach from current terminal, write pidfile, kill parent
161 /* First check if we can open a fresh new pidfile */
166 /* If we succeeded in doing that, detach */
174 fprintf(stderr, _("Couldn't detach from terminal: %s"), strerror(errno));
178 /* Now UPDATE the pid in the pidfile, because we changed it... */
180 if(!write_pid(pidfilename))
184 openlog(identname, LOG_CONS | LOG_PID, LOG_DAEMON);
186 if(debug_lvl > DEBUG_NOTHING)
187 syslog(LOG_NOTICE, _("tincd %s (%s %s) starting, debug level %d"),
188 VERSION, __DATE__, __TIME__, debug_lvl);
190 syslog(LOG_NOTICE, _("tincd %s starting"), VERSION);
192 xalloc_fail_func = memory_full;
198 Execute the program name, with sane environment. All output will be
199 redirected to syslog.
201 void _execute_script(const char *name) __attribute__ ((noreturn));
202 void _execute_script(const char *name)
210 unsetenv("INTERFACE");
215 asprintf(&s, "NETNAME=%s", netname);
216 putenv(s); /* Don't free s! see man 3 putenv */
221 asprintf(&s, "DEVICE=%s", device);
222 putenv(s); /* Don't free s! see man 3 putenv */
227 asprintf(&s, "INTERFACE=%s", interface);
228 putenv(s); /* Don't free s! see man 3 putenv */
233 asprintf(&scriptname, "%s/%s", confbase, name);
235 /* Close all file descriptors */
236 closelog(); /* <- this means we cannot use syslog() here anymore! */
239 execl(scriptname, NULL);
240 /* No return on success */
242 if(errno != ENOENT) /* Ignore if the file does not exist */
243 exit(1); /* Some error while trying execl(). */
249 Fork and execute the program pointed to by name.
251 int execute_script(const char *name)
256 if((pid = fork()) < 0)
258 syslog(LOG_ERR, _("System call `%s' failed: %m"),
265 if(debug_lvl >= DEBUG_STATUS)
266 syslog(LOG_INFO, _("Executing script %s"), name);
268 if(waitpid(pid, &status, 0) == pid)
270 if(WIFEXITED(status)) /* Child exited by itself */
272 if(WEXITSTATUS(status))
274 syslog(LOG_ERR, _("Process %d (%s) exited with non-zero status %d"), pid, name, WEXITSTATUS(status));
280 else if(WIFSIGNALED(status)) /* Child was killed by a signal */
282 syslog(LOG_ERR, _("Process %d (%s) was killed by signal %d (%s)"),
283 pid, name, WTERMSIG(status), strsignal(WTERMSIG(status)));
286 else /* Something strange happened */
288 syslog(LOG_ERR, _("Process %d (%s) terminated abnormally"), pid, name);
294 syslog(LOG_ERR, _("System call `%s' failed: %m"), "waitpid");
301 _execute_script(name);
310 sigterm_handler(int a, siginfo_t *info, void *b)
312 if(debug_lvl > DEBUG_NOTHING)
313 syslog(LOG_NOTICE, _("Got TERM signal"));
319 sigquit_handler(int a, siginfo_t *info, void *b)
321 if(debug_lvl > DEBUG_NOTHING)
322 syslog(LOG_NOTICE, _("Got QUIT signal"));
327 sigsegv_square(int a, siginfo_t *info, void *b)
329 syslog(LOG_ERR, _("Got another SEGV signal: not restarting"));
335 sigsegv_handler(int a, siginfo_t *info, void *b)
337 struct sigaction act;
338 syslog(LOG_ERR, _("Got SEGV signal"));
343 syslog(LOG_NOTICE, _("Trying to re-execute in 5 seconds..."));
345 act.sa_handler = NULL;
346 act.sa_mask = emptysigset;
347 act.sa_flags = SA_SIGINFO;
348 act.sa_sigaction = sigsegv_square;
349 sigaction(SIGSEGV, &act, NULL);
351 close_network_connections();
353 remove_pid(pidfilename);
354 execvp(g_argv[0], g_argv);
358 syslog(LOG_NOTICE, _("Not restarting."));
364 sighup_handler(int a, siginfo_t *info, void *b)
366 if(debug_lvl > DEBUG_NOTHING)
367 syslog(LOG_NOTICE, _("Got HUP signal"));
372 sigint_handler(int a, siginfo_t *info, void *b)
376 syslog(LOG_NOTICE, _("Reverting to old debug level (%d)"),
378 debug_lvl = saved_debug_lvl;
383 syslog(LOG_NOTICE, _("Temporarily setting debug level to 5. Kill me with SIGINT again to go back to level %d."),
385 saved_debug_lvl = debug_lvl;
391 sigalrm_handler(int a, siginfo_t *info, void *b)
393 if(debug_lvl > DEBUG_NOTHING)
394 syslog(LOG_NOTICE, _("Got ALRM signal"));
399 sigusr1_handler(int a, siginfo_t *info, void *b)
405 sigusr2_handler(int a, siginfo_t *info, void *b)
414 sigwinch_handler(int a, siginfo_t *info, void *b)
421 unexpected_signal_handler(int a, siginfo_t *info, void *b)
423 syslog(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
428 ignore_signal_handler(int a, siginfo_t *info, void *b)
430 if(debug_lvl >= DEBUG_SCARY_THINGS)
432 syslog(LOG_DEBUG, _("Ignored signal %d (%s)"), a, strsignal(a));
439 void (*handler)(int, siginfo_t *, void *);
441 { SIGHUP, sighup_handler },
442 { SIGTERM, sigterm_handler },
443 { SIGQUIT, sigquit_handler },
444 { SIGSEGV, sigsegv_handler },
445 { SIGPIPE, ignore_signal_handler },
446 { SIGINT, sigint_handler },
447 { SIGUSR1, sigusr1_handler },
448 { SIGUSR2, sigusr2_handler },
449 { SIGCHLD, ignore_signal_handler },
450 { SIGALRM, sigalrm_handler },
451 { SIGWINCH, sigwinch_handler },
459 struct sigaction act;
461 sigemptyset(&emptysigset);
462 act.sa_handler = NULL;
463 act.sa_mask = emptysigset;
464 act.sa_flags = SA_SIGINFO;
466 /* Set a default signal handler for every signal, errors will be
468 for(i = 0; i < NSIG; i++)
471 act.sa_sigaction = (void(*)(int, siginfo_t *, void *))SIG_DFL;
473 act.sa_sigaction = unexpected_signal_handler;
474 sigaction(i, &act, NULL);
477 /* If we didn't detach, allow coredumps */
479 sighandlers[3].handler = (void(*)(int, siginfo_t *, void *))SIG_DFL;
481 /* Then, for each known signal that we want to catch, assign a
482 handler to the signal, with error checking this time. */
483 for(i = 0; sighandlers[i].signal; i++)
485 act.sa_sigaction = sighandlers[i].handler;
486 if(sigaction(sighandlers[i].signal, &act, NULL) < 0)
487 fprintf(stderr, _("Installing signal handler for signal %d (%s) failed: %s\n"),
488 sighandlers[i].signal, strsignal(sighandlers[i].signal), strerror(errno));