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 1.2 2002/04/09 15:26:00 zarq Exp $
31 #include <sys/ioctl.h>
32 #include <sys/types.h>
47 #include "connection.h"
52 /* If zero, don't detach from the terminal. */
55 extern char *identname;
56 extern char *pidfilename;
61 static int saved_debug_lvl = 0;
67 void memory_full(int size)
69 syslog(LOG_ERR, _("Memory exhausted (couldn't allocate %d bytes), exitting."), size);
74 /* Some functions the less gifted operating systems might lack... */
76 #ifndef HAVE_FCLOSEALL
90 Close network connections, and terminate neatly
92 void cleanup_and_exit(int c)
95 close_network_connections();
97 if(debug_lvl > DEBUG_NOTHING)
100 syslog(LOG_NOTICE, _("Terminating"));
107 check for an existing tinc for this net, and write pid to pidfile
109 int write_pidfile(void)
113 if((pid = check_pid(pidfilename)))
116 fprintf(stderr, _("A tincd is already running for net `%s' with pid %d.\n"),
119 fprintf(stderr, _("A tincd is already running with pid %d.\n"), pid);
123 /* if it's locked, write-protected, or whatever */
124 if(!write_pid(pidfilename))
131 kill older tincd for this net
133 int kill_other(int signal)
137 if(!(pid = read_pid(pidfilename)))
140 fprintf(stderr, _("No other tincd is running for net `%s'.\n"), netname);
142 fprintf(stderr, _("No other tincd is running.\n"));
146 errno = 0; /* No error, sometimes errno is only changed on error */
147 /* ESRCH is returned when no process with that pid is found */
148 if(kill(pid, signal) && errno == ESRCH)
151 fprintf(stderr, _("The tincd for net `%s' is no longer running. "), netname);
153 fprintf(stderr, _("The tincd is no longer running. "));
155 fprintf(stderr, _("Removing stale lock file.\n"));
156 remove_pid(pidfilename);
163 Detach from current terminal, write pidfile, kill parent
170 /* First check if we can open a fresh new pidfile */
175 /* If we succeeded in doing that, detach */
183 fprintf(stderr, _("Couldn't detach from terminal: %s"), strerror(errno));
187 /* Now UPDATE the pid in the pidfile, because we changed it... */
189 if(!write_pid(pidfilename))
193 openlog(identname, LOG_CONS | LOG_PID, LOG_DAEMON);
195 if(debug_lvl > DEBUG_NOTHING)
196 syslog(LOG_NOTICE, _("tincd %s (%s %s) starting, debug level %d"),
197 VERSION, __DATE__, __TIME__, debug_lvl);
199 syslog(LOG_NOTICE, _("tincd %s starting"), VERSION);
201 xalloc_fail_func = memory_full;
207 Execute the program name, with sane environment. All output will be
208 redirected to syslog.
210 void _execute_script(const char *scriptname) __attribute__ ((noreturn));
211 void _execute_script(const char *scriptname)
218 unsetenv("INTERFACE");
223 asprintf(&s, "NETNAME=%s", netname);
224 putenv(s); /* Don't free s! see man 3 putenv */
229 asprintf(&s, "DEVICE=%s", device);
230 putenv(s); /* Don't free s! see man 3 putenv */
235 asprintf(&s, "INTERFACE=%s", interface);
236 putenv(s); /* Don't free s! see man 3 putenv */
241 /* Close all file descriptors */
242 closelog(); /* <- this means we cannot use syslog() here anymore! */
245 execl(scriptname, NULL);
246 /* No return on success */
248 if(errno != ENOENT) /* Ignore if the file does not exist */
249 exit(1); /* Some error while trying execl(). */
255 Fork and execute the program pointed to by name.
257 int execute_script(const char *name)
264 asprintf(&scriptname, "%s/%s", confbase, name);
266 /* First check if there is a script */
268 if(stat(scriptname, &s))
271 if((pid = fork()) < 0)
273 syslog(LOG_ERR, _("System call `%s' failed: %s"), "fork", strerror(errno));
279 if(debug_lvl >= DEBUG_STATUS)
280 syslog(LOG_INFO, _("Executing script %s"), name);
284 if(waitpid(pid, &status, 0) == pid)
286 if(WIFEXITED(status)) /* Child exited by itself */
288 if(WEXITSTATUS(status))
290 syslog(LOG_ERR, _("Process %d (%s) exited with non-zero status %d"), pid, name, WEXITSTATUS(status));
296 else if(WIFSIGNALED(status)) /* Child was killed by a signal */
298 syslog(LOG_ERR, _("Process %d (%s) was killed by signal %d (%s)"),
299 pid, name, WTERMSIG(status), strsignal(WTERMSIG(status)));
302 else /* Something strange happened */
304 syslog(LOG_ERR, _("Process %d (%s) terminated abnormally"), pid, name);
310 syslog(LOG_ERR, _("System call `%s' failed: %s"), "waitpid", strerror(errno));
317 _execute_script(scriptname);
326 sigterm_handler(int a)
328 if(debug_lvl > DEBUG_NOTHING)
329 syslog(LOG_NOTICE, _("Got TERM signal"));
335 sigquit_handler(int a)
337 if(debug_lvl > DEBUG_NOTHING)
338 syslog(LOG_NOTICE, _("Got QUIT signal"));
343 fatal_signal_square(int a)
345 syslog(LOG_ERR, _("Got another fatal signal %d (%s): not restarting."), a, strsignal(a));
351 fatal_signal_handler(int a)
353 struct sigaction act;
354 syslog(LOG_ERR, _("Got fatal signal %d (%s)"), a, strsignal(a));
359 syslog(LOG_NOTICE, _("Trying to re-execute in 5 seconds..."));
361 act.sa_handler = fatal_signal_square;
362 act.sa_mask = emptysigset;
364 sigaction(SIGSEGV, &act, NULL);
366 close_network_connections();
368 remove_pid(pidfilename);
369 execvp(g_argv[0], g_argv);
373 syslog(LOG_NOTICE, _("Not restarting."));
379 sighup_handler(int a)
381 if(debug_lvl > DEBUG_NOTHING)
382 syslog(LOG_NOTICE, _("Got HUP signal"));
387 sigint_handler(int a)
391 syslog(LOG_NOTICE, _("Reverting to old debug level (%d)"),
393 debug_lvl = saved_debug_lvl;
398 syslog(LOG_NOTICE, _("Temporarily setting debug level to 5. Kill me with SIGINT again to go back to level %d."),
400 saved_debug_lvl = debug_lvl;
406 sigalrm_handler(int a)
408 if(debug_lvl > DEBUG_NOTHING)
409 syslog(LOG_NOTICE, _("Got ALRM signal"));
414 sigusr1_handler(int a)
420 sigusr2_handler(int a)
429 sigwinch_handler(int a)
436 unexpected_signal_handler(int a)
438 syslog(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
443 ignore_signal_handler(int a)
445 if(debug_lvl >= DEBUG_SCARY_THINGS)
447 syslog(LOG_DEBUG, _("Ignored signal %d (%s)"), a, strsignal(a));
454 void (*handler)(int);
456 { SIGHUP, sighup_handler },
457 { SIGTERM, sigterm_handler },
458 { SIGQUIT, sigquit_handler },
459 { SIGSEGV, fatal_signal_handler },
460 { SIGBUS, fatal_signal_handler },
461 { SIGILL, fatal_signal_handler },
462 { SIGPIPE, ignore_signal_handler },
463 { SIGINT, sigint_handler },
464 { SIGUSR1, sigusr1_handler },
465 { SIGUSR2, sigusr2_handler },
466 { SIGCHLD, ignore_signal_handler },
467 { SIGALRM, sigalrm_handler },
468 { SIGWINCH, sigwinch_handler },
476 struct sigaction act;
478 sigemptyset(&emptysigset);
479 act.sa_handler = NULL;
480 act.sa_mask = emptysigset;
483 /* Set a default signal handler for every signal, errors will be
485 for(i = 0; i < NSIG; i++)
488 act.sa_handler = SIG_DFL;
490 act.sa_handler = unexpected_signal_handler;
491 sigaction(i, &act, NULL);
494 /* If we didn't detach, allow coredumps */
496 sighandlers[3].handler = SIG_DFL;
498 /* Then, for each known signal that we want to catch, assign a
499 handler to the signal, with error checking this time. */
500 for(i = 0; sighandlers[i].signal; i++)
502 act.sa_handler = sighandlers[i].handler;
503 if(sigaction(sighandlers[i].signal, &act, NULL) < 0)
504 fprintf(stderr, _("Installing signal handler for signal %d (%s) failed: %s\n"),
505 sighandlers[i].signal, strsignal(sighandlers[i].signal), strerror(errno));