2 process.c -- process management functions
3 Copyright (C) 1999-2001 Ivo Timmermans <itimmermans@bigfoot.com>,
4 2000,2001 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 1.1.2.20 2001/01/07 17:09:02 guus Exp $
31 #include <sys/ioctl.h>
32 #include <sys/types.h>
45 #include "connection.h"
49 /* If zero, don't detach from the terminal. */
52 extern char *identname;
53 extern char *pidfilename;
58 void memory_full(int size)
60 syslog(LOG_ERR, _("Memory exhausted (couldn't allocate %d bytes), exiting."), size);
65 /* Some functions the less gifted operating systems might lack... */
67 #ifndef HAVE_FCLOSEALL
80 Close network connections, and terminate neatly
82 void cleanup_and_exit(int c)
85 close_network_connections();
87 if(debug_lvl > DEBUG_NOTHING)
88 syslog(LOG_INFO, _("Total bytes written: tap %d, socket %d; bytes read: tap %d, socket %d"),
89 total_tap_out, total_socket_out, total_tap_in, total_socket_in);
91 syslog(LOG_NOTICE, _("Terminating"));
98 check for an existing tinc for this net, and write pid to pidfile
100 int write_pidfile(void)
104 if((pid = check_pid(pidfilename)))
107 fprintf(stderr, _("A tincd is already running for net `%s' with pid %d.\n"),
110 fprintf(stderr, _("A tincd is already running with pid %d.\n"), pid);
114 /* if it's locked, write-protected, or whatever */
115 if(!write_pid(pidfilename))
122 kill older tincd for this net
128 if(!(pid = read_pid(pidfilename)))
131 fprintf(stderr, _("No other tincd is running for net `%s'.\n"), netname);
133 fprintf(stderr, _("No other tincd is running.\n"));
137 errno = 0; /* No error, sometimes errno is only changed on error */
138 /* ESRCH is returned when no process with that pid is found */
139 if(kill(pid, SIGTERM) && errno == ESRCH)
140 fprintf(stderr, _("Removing stale lock file.\n"));
141 remove_pid(pidfilename);
147 Detach from current terminal, write pidfile, kill parent
154 /* First check if we can open a fresh new pidfile */
159 /* If we succeeded in doing that, detach */
167 fprintf(stderr, _("Couldn't detach from terminal: %m"));
171 /* Now UPDATE the pid in the pidfile, because we changed it... */
173 if(!write_pid(pidfilename))
177 openlog(identname, LOG_CONS | LOG_PID, LOG_DAEMON);
179 if(debug_lvl > DEBUG_NOTHING)
180 syslog(LOG_NOTICE, _("tincd %s (%s %s) starting, debug level %d"),
181 VERSION, __DATE__, __TIME__, debug_lvl);
183 syslog(LOG_NOTICE, _("tincd %s starting"), VERSION);
185 xalloc_fail_func = memory_full;
191 Execute the program name, with sane environment. All output will be
192 redirected to syslog.
194 void _execute_script(const char *name) __attribute__ ((noreturn));
195 void _execute_script(const char *name)
202 asprintf(&s, "NETNAME=%s", netname);
203 putenv(s); /* Don't free s! see man 3 putenv */
214 asprintf(&scriptname, "%s/%s", confbase, name);
216 /* Close all file descriptors */
217 closelog(); /* <- this means we cannot use syslog() here anymore! */
220 execl(scriptname, NULL);
221 /* No return on success */
223 if(errno != ENOENT) /* Ignore if the file does not exist */
224 exit(-1); /* Some error while trying execl(). */
230 Fork and execute the program pointed to by name.
232 int execute_script(const char *name)
237 if((pid = fork()) < 0)
239 syslog(LOG_ERR, _("System call `%s' failed: %m"),
246 if(debug_lvl >= DEBUG_STATUS)
247 syslog(LOG_INFO, _("Executing script %s"), name);
249 if(waitpid(pid, &status, 0) == pid)
251 if(WIFEXITED(status)) /* Child exited by itself */
253 if(WEXITSTATUS(status))
255 syslog(LOG_ERR, _("Process %d (%s) exited with non-zero status %d"), pid, name, WEXITSTATUS(status));
261 else if(WIFSIGNALED(status)) /* Child was killed by a signal */
263 syslog(LOG_ERR, _("Process %d (%s) was killed by signal %d (%s)"),
264 pid, name, WTERMSIG(status), strsignal(WTERMSIG(status)));
267 else /* Something strange happened */
269 syslog(LOG_ERR, _("Process %d (%s) terminated abnormally"), pid, name);
275 syslog(LOG_ERR, _("System call `%s' failed: %m"), "waitpid");
282 _execute_script(name);
291 sigterm_handler(int a, siginfo_t *info, void *b)
293 if(debug_lvl > DEBUG_NOTHING)
294 syslog(LOG_NOTICE, _("Got TERM signal"));
300 sigquit_handler(int a, siginfo_t *info, void *b)
302 if(debug_lvl > DEBUG_NOTHING)
303 syslog(LOG_NOTICE, _("Got QUIT signal"));
308 sigsegv_square(int a, siginfo_t *info, void *b)
310 syslog(LOG_ERR, _("Got another SEGV signal: not restarting"));
316 sigsegv_handler(int a, siginfo_t *info, void *b)
318 struct sigaction act;
319 syslog(LOG_ERR, _("Got SEGV signal"));
324 syslog(LOG_NOTICE, _("Trying to re-execute in 5 seconds..."));
326 act.sa_handler = NULL;
327 act.sa_mask = emptysigset;
328 act.sa_flags = SA_SIGINFO;
329 act.sa_sigaction = sigsegv_square;
331 close_network_connections();
333 remove_pid(pidfilename);
334 execvp(g_argv[0], g_argv);
338 syslog(LOG_NOTICE, _("Not restarting."));
344 sighup_handler(int a, siginfo_t *info, void *b)
346 if(debug_lvl > DEBUG_NOTHING)
347 syslog(LOG_NOTICE, _("Got HUP signal"));
352 sigint_handler(int a, siginfo_t *info, void *b)
354 if(debug_lvl > DEBUG_NOTHING)
355 syslog(LOG_NOTICE, _("Got INT signal, exiting"));
360 sigusr1_handler(int a, siginfo_t *info, void *b)
362 dump_connection_list();
366 sigusr2_handler(int a, siginfo_t *info, void *b)
372 unexpected_signal_handler(int a, siginfo_t *info, void *b)
374 syslog(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
380 void (*handler)(int, siginfo_t *, void *);
382 { SIGHUP, sighup_handler },
383 { SIGTERM, sigterm_handler },
384 { SIGQUIT, sigquit_handler },
385 { SIGSEGV, sigsegv_handler },
387 { SIGINT, sigint_handler },
388 { SIGUSR1, sigusr1_handler },
389 { SIGUSR2, sigusr2_handler },
398 struct sigaction act;
400 sigemptyset(&emptysigset);
401 act.sa_handler = NULL;
402 act.sa_mask = emptysigset;
403 act.sa_flags = SA_SIGINFO;
405 /* Set a default signal handler for every signal, errors will be
407 for(i = 0; i < NSIG; i++)
409 act.sa_sigaction = unexpected_signal_handler;
410 sigaction(sighandlers[i].signal, &act, NULL);
413 /* Then, for each known signal that we want to catch, assign a
414 handler to the signal, with error checking this time. */
415 for(i = 0; sighandlers[i].signal; i++)
417 act.sa_sigaction = sighandlers[i].handler;
418 if(sigaction(sighandlers[i].signal, &act, NULL) < 0)
419 fprintf(stderr, _("Installing signal handler for signal %d (%s) failed: %m\n"),
420 sighandlers[i].signal, strsignal(sighandlers[i].signal));