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 1.1.2.35 2002/02/18 16:25:16 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: %s"), "fork", strerror(errno));
264 if(debug_lvl >= DEBUG_STATUS)
265 syslog(LOG_INFO, _("Executing script %s"), name);
267 if(waitpid(pid, &status, 0) == pid)
269 if(WIFEXITED(status)) /* Child exited by itself */
271 if(WEXITSTATUS(status))
273 syslog(LOG_ERR, _("Process %d (%s) exited with non-zero status %d"), pid, name, WEXITSTATUS(status));
279 else if(WIFSIGNALED(status)) /* Child was killed by a signal */
281 syslog(LOG_ERR, _("Process %d (%s) was killed by signal %d (%s)"),
282 pid, name, WTERMSIG(status), strsignal(WTERMSIG(status)));
285 else /* Something strange happened */
287 syslog(LOG_ERR, _("Process %d (%s) terminated abnormally"), pid, name);
293 syslog(LOG_ERR, _("System call `%s' failed: %s"), "waitpid", strerror(errno));
300 _execute_script(name);
309 sigterm_handler(int a)
311 if(debug_lvl > DEBUG_NOTHING)
312 syslog(LOG_NOTICE, _("Got TERM signal"));
318 sigquit_handler(int a)
320 if(debug_lvl > DEBUG_NOTHING)
321 syslog(LOG_NOTICE, _("Got QUIT signal"));
326 sigsegv_square(int a)
328 syslog(LOG_ERR, _("Got another SEGV signal: not restarting"));
334 sigsegv_handler(int a)
336 struct sigaction act;
337 syslog(LOG_ERR, _("Got SEGV signal"));
342 syslog(LOG_NOTICE, _("Trying to re-execute in 5 seconds..."));
344 act.sa_handler = sigsegv_square;
345 act.sa_mask = emptysigset;
347 sigaction(SIGSEGV, &act, NULL);
349 close_network_connections();
351 remove_pid(pidfilename);
352 execvp(g_argv[0], g_argv);
356 syslog(LOG_NOTICE, _("Not restarting."));
362 sighup_handler(int a)
364 if(debug_lvl > DEBUG_NOTHING)
365 syslog(LOG_NOTICE, _("Got HUP signal"));
370 sigint_handler(int a)
374 syslog(LOG_NOTICE, _("Reverting to old debug level (%d)"),
376 debug_lvl = saved_debug_lvl;
381 syslog(LOG_NOTICE, _("Temporarily setting debug level to 5. Kill me with SIGINT again to go back to level %d."),
383 saved_debug_lvl = debug_lvl;
389 sigalrm_handler(int a)
391 if(debug_lvl > DEBUG_NOTHING)
392 syslog(LOG_NOTICE, _("Got ALRM signal"));
397 sigusr1_handler(int a)
403 sigusr2_handler(int a)
412 sigwinch_handler(int a)
419 unexpected_signal_handler(int a)
421 syslog(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
426 ignore_signal_handler(int a)
428 if(debug_lvl >= DEBUG_SCARY_THINGS)
430 syslog(LOG_DEBUG, _("Ignored signal %d (%s)"), a, strsignal(a));
437 void (*handler)(int);
439 { SIGHUP, sighup_handler },
440 { SIGTERM, sigterm_handler },
441 { SIGQUIT, sigquit_handler },
442 { SIGSEGV, sigsegv_handler },
443 { SIGPIPE, ignore_signal_handler },
444 { SIGINT, sigint_handler },
445 { SIGUSR1, sigusr1_handler },
446 { SIGUSR2, sigusr2_handler },
447 { SIGCHLD, ignore_signal_handler },
448 { SIGALRM, sigalrm_handler },
449 { SIGWINCH, sigwinch_handler },
457 struct sigaction act;
459 sigemptyset(&emptysigset);
460 act.sa_handler = NULL;
461 act.sa_mask = emptysigset;
464 /* Set a default signal handler for every signal, errors will be
466 for(i = 0; i < NSIG; i++)
469 act.sa_handler = SIG_DFL;
471 act.sa_handler = unexpected_signal_handler;
472 sigaction(i, &act, NULL);
475 /* If we didn't detach, allow coredumps */
477 sighandlers[3].handler = SIG_DFL;
479 /* Then, for each known signal that we want to catch, assign a
480 handler to the signal, with error checking this time. */
481 for(i = 0; sighandlers[i].signal; i++)
483 act.sa_handler = sighandlers[i].handler;
484 if(sigaction(sighandlers[i].signal, &act, NULL) < 0)
485 fprintf(stderr, _("Installing signal handler for signal %d (%s) failed: %s\n"),
486 sighandlers[i].signal, strsignal(sighandlers[i].signal), strerror(errno));