2 process.c -- process management functions
3 Copyright (C) 1999,2000 Ivo Timmermans <itimmermans@bigfoot.com>,
4 2000 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 1.1.2.16 2000/11/26 22:42:34 zarq Exp $
31 #include <sys/ioctl.h>
32 #include <sys/types.h>
46 #include "connection.h"
50 /* If zero, don't detach from the terminal. */
53 extern char *identname;
54 extern char *pidfilename;
57 void memory_full(int size)
59 syslog(LOG_ERR, _("Memory exhausted (couldn't allocate %d bytes), exiting."), size);
64 /* Some functions the less gifted operating systems might lack... */
66 #ifndef HAVE_FCLOSEALL
79 Close network connections, and terminate neatly
81 void cleanup_and_exit(int c)
84 close_network_connections();
86 if(debug_lvl > DEBUG_NOTHING)
87 syslog(LOG_INFO, _("Total bytes written: tap %d, socket %d; bytes read: tap %d, socket %d"),
88 total_tap_out, total_socket_out, total_tap_in, total_socket_in);
90 syslog(LOG_NOTICE, _("Terminating"));
97 check for an existing tinc for this net, and write pid to pidfile
99 int write_pidfile(void)
103 if((pid = check_pid(pidfilename)))
106 fprintf(stderr, _("A tincd is already running for net `%s' with pid %d.\n"),
109 fprintf(stderr, _("A tincd is already running with pid %d.\n"), pid);
113 /* if it's locked, write-protected, or whatever */
114 if(!write_pid(pidfilename))
121 kill older tincd for this net
127 if(!(pid = read_pid(pidfilename)))
130 fprintf(stderr, _("No other tincd is running for net `%s'.\n"), netname);
132 fprintf(stderr, _("No other tincd is running.\n"));
136 errno = 0; /* No error, sometimes errno is only changed on error */
137 /* ESRCH is returned when no process with that pid is found */
138 if(kill(pid, SIGTERM) && errno == ESRCH)
139 fprintf(stderr, _("Removing stale lock file.\n"));
140 remove_pid(pidfilename);
146 Detach from current terminal, write pidfile, kill parent
153 /* First check if we can open a fresh new pidfile */
158 /* If we succeeded in doing that, detach */
164 fprintf(stderr, _("Couldn't detach from terminal: %m"));
168 /* Now UPDATE the pid in the pidfile, because we changed it... */
170 if(!write_pid(pidfilename))
174 openlog(identname, LOG_CONS | LOG_PID, LOG_DAEMON);
176 if(debug_lvl > DEBUG_NOTHING)
177 syslog(LOG_NOTICE, _("tincd %s (%s %s) starting, debug level %d"),
178 VERSION, __DATE__, __TIME__, debug_lvl);
180 syslog(LOG_NOTICE, _("tincd %s starting"), VERSION);
182 xalloc_fail_func = memory_full;
188 Execute the program name, with sane environment. All output will be
189 redirected to syslog.
191 void _execute_script(const char *name) __attribute__ ((noreturn));
192 void _execute_script(const char *name)
199 asprintf(&s, "NETNAME=%s", netname);
200 putenv(s); /* Don't free s! see man 3 putenv */
211 asprintf(&scriptname, "%s/%s", confbase, name);
213 /* Close all file descriptors */
214 closelog(); /* <- this means we cannot use syslog() here anymore! */
217 execl(scriptname, NULL);
218 /* No return on success */
220 if(errno != ENOENT) /* Ignore if the file does not exist */
221 exit(-1); /* Some error while trying execl(). */
227 Fork and execute the program pointed to by name.
229 int execute_script(const char *name)
234 if((pid = fork()) < 0)
236 syslog(LOG_ERR, _("System call `%s' failed: %m"),
243 if(debug_lvl >= DEBUG_STATUS)
244 syslog(LOG_INFO, _("Executing script %s"), name);
246 if(waitpid(pid, &status, 0) == pid)
248 if(WIFEXITED(status)) /* Child exited by itself */
250 if(WEXITSTATUS(status))
252 syslog(LOG_ERR, _("Process %d (%s) exited with non-zero status %d"), pid, name, WEXITSTATUS(status));
258 else if(WIFSIGNALED(status)) /* Child was killed by a signal */
260 syslog(LOG_ERR, _("Process %d (%s) was killed by signal %d (%s)"),
261 pid, name, WTERMSIG(status), strsignal(WTERMSIG(status)));
264 else /* Something strange happened */
266 syslog(LOG_ERR, _("Process %d (%s) terminated abnormaly"), pid, name);
272 syslog(LOG_ERR, _("System call `%s' failed: %m"), "waitpid");
279 _execute_script(name);
288 sigterm_handler(int a, siginfo_t *info, void *)
290 if(debug_lvl > DEBUG_NOTHING)
291 syslog(LOG_NOTICE, _("Got TERM signal"));
297 sigquit_handler(int a, siginfo_t *info, void *)
299 if(debug_lvl > DEBUG_NOTHING)
300 syslog(LOG_NOTICE, _("Got QUIT signal"));
305 sigsegv_square(int a, siginfo_t *info, void *)
307 syslog(LOG_ERR, _("Got another SEGV signal: not restarting"));
313 sigsegv_handler(int a, siginfo_t *info, void *)
315 syslog(LOG_ERR, _("Got SEGV signal"));
320 syslog(LOG_NOTICE, _("Trying to re-execute in 5 seconds..."));
321 signal(SIGSEGV, sigsegv_square);
322 close_network_connections();
324 remove_pid(pidfilename);
325 execvp(g_argv[0], g_argv);
329 syslog(LOG_NOTICE, _("Not restarting."));
335 sighup_handler(int a, siginfo_t *info, void *)
337 if(debug_lvl > DEBUG_NOTHING)
338 syslog(LOG_NOTICE, _("Got HUP signal"));
343 sigint_handler(int a, siginfo_t *info, void *)
345 if(debug_lvl > DEBUG_NOTHING)
346 syslog(LOG_NOTICE, _("Got INT signal, exiting"));
351 sigusr1_handler(int a, siginfo_t *info, void *)
353 dump_connection_list();
357 sigusr2_handler(int a, siginfo_t *info, void *)
363 sighuh(int a, siginfo_t *info, void *)
365 syslog(LOG_WARNING, _("Got unexpected signal %d (%s)"), a, strsignal(a));
371 void (*handler)(int, siginfo_t *, void *);
373 { SIGHUP, sighup_handler },
374 { SIGTERM, sigterm_handler },
375 { SIGQUIT, sigquit_handler },
376 { SIGSEGV, sigsegv_handler },
378 { SIGINT, sigint_handler },
379 { SIGUSR1, sigusr1_handler },
380 { SIGUSR2, sigusr2_handler },
390 struct sigaction act;
393 act.sa_handler = NULL;
395 act.sa_flags = SA_SIGINFO;
397 /* Set a default signal handler for every signal, errors will be
399 for(i = 0; i < NSIG; i++)
401 act.sa_sigaction = sighuh_handler;
402 sigaction(sighandlers[i].signal, &act, NULL);
405 /* Then, for each known signal that we want to catch, assign a
406 handler to the signal, with error checking this time. */
407 for(i = 0; sighandlers[i].signal; i++)
409 act.sa_sigaction = sighandlers[i].handler;
410 if(sigaction(sighandlers[i].signal, &act, NULL) < 0)
411 fprintf(stderr, _("Installing signal handler for signal %d (%s) failed: %m\n"),
412 sighandlers[i].signal, strsignal(sighandlers[i].signal));