2 Bacula® - The Network Backup Solution
4 Copyright (C) 2000-2008 Free Software Foundation Europe e.V.
6 The main author of Bacula is Kern Sibbald, with contributions from
7 many others, a complete list can be found in the file AUTHORS.
8 This program is Free Software; you can redistribute it and/or
9 modify it under the terms of version two of the GNU General Public
10 License as published by the Free Software Foundation and included
13 This program is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
23 Bacula® is a registered trademark of Kern Sibbald.
24 The licensor of Bacula is the Free Software Foundation Europe
25 (FSFE), Fiduciary Program, Sumatrastrasse 25, 8006 Zürich,
26 Switzerland, email:ftf@fsfeurope.org.
29 * Signal handlers for Bacula daemons
31 * Kern Sibbald, April 2000
35 * Note, we probably should do a core dump for the serious
36 * signals such as SIGBUS, SIGPFE, ...
37 * Also, for SIGHUP and SIGUSR1, we should re-read the
38 * configuration file. However, since this is a "general"
39 * routine, we leave it to the individual daemons to
40 * tweek their signals after calling this routine.
53 extern char my_name[];
56 extern void print_jcr_dbg();
58 static const char *sig_names[BA_NSIG+1];
60 typedef void (SIG_HANDLER)(int sig);
61 static SIG_HANDLER *exit_handler;
64 static pid_t main_pid = 0;
66 const char *get_signal_name(int sig)
68 if (sig < 0 || sig > BA_NSIG || !sig_names[sig]) {
69 return _("Invalid signal number");
71 return sig_names[sig];
75 /* defined in jcr.c */
76 extern void _print_jcr_dbg(FILE *fp);
81 * This function should be used ONLY after a violent signal. We walk through the
82 * JCR chain without doing any lock, bacula should not be running.
84 static void print_bacula_dbg()
88 snprintf(buf, sizeof(buf), "%s/bacula.%d.bactrace",
89 working_directory, getpid());
90 FILE *fp = fopen(buf, "ab") ;
103 * Handle signals here
105 extern "C" void signal_handler(int sig)
107 static int already_dead = 0;
109 /* If we come back more than once, get out fast! */
113 Dmsg2(900, "sig=%d %s\n", sig, sig_names[sig]);
114 /* Ignore certain signals -- SIGUSR2 used to interrupt threads */
115 if (sig == SIGCHLD || sig == SIGUSR2) {
119 if (sig == SIGTERM) {
120 // Emsg1(M_TERM, -1, "Shutting down Bacula service: %s ...\n", my_name);
122 Emsg2(M_FATAL, -1, _("Bacula interrupted by signal %d: %s\n"), sig, get_signal_name(sig));
126 if (sig != SIGTERM) {
127 struct sigaction sigdefault;
128 static char *argv[4];
129 static char pid_buf[20];
130 static char btpath[400];
133 int exelen = strlen(exepath);
135 fprintf(stderr, _("Kaboom! %s, %s got signal %d - %s. Attempting traceback.\n"),
136 exename, my_name, sig, get_signal_name(sig));
137 fprintf(stderr, _("Kaboom! exepath=%s\n"), exepath);
139 if (exelen + 12 > (int)sizeof(btpath)) {
140 bstrncpy(btpath, "btraceback", sizeof(btpath));
142 bstrncpy(btpath, exepath, sizeof(btpath));
143 if (IsPathSeparator(btpath[exelen-1])) {
144 btpath[exelen-1] = 0;
146 bstrncat(btpath, "/btraceback", sizeof(btpath));
148 if (!IsPathSeparator(exepath[exelen - 1])) {
149 strcat(exepath, "/");
151 strcat(exepath, exename);
152 if (!working_directory) {
153 working_directory = buf;
156 if (*working_directory == 0) {
157 strcpy((char *)working_directory, "/tmp/");
159 if (chdir(working_directory) != 0) { /* dump in working directory */
161 Pmsg2(000, "chdir to %s failed. ERR=%s\n", working_directory, be.bstrerror());
162 strcpy((char *)working_directory, "/tmp/");
164 unlink("./core"); /* get rid of any old core file */
165 sprintf(pid_buf, "%d", (int)main_pid);
166 Dmsg1(300, "Working=%s\n", working_directory);
167 Dmsg1(300, "btpath=%s\n", btpath);
168 Dmsg1(300, "exepath=%s\n", exepath);
169 switch (pid = fork()) {
171 fprintf(stderr, _("Fork error: ERR=%s\n"), strerror(errno));
174 argv[0] = btpath; /* path to btraceback */
175 argv[1] = exepath; /* path to exe */
177 argv[3] = (char *)NULL;
178 fprintf(stderr, _("Calling: %s %s %s\n"), btpath, exepath, pid_buf);
179 if (execv(btpath, argv) != 0) {
181 printf(_("execv: %s failed: ERR=%s\n"), btpath, be.bstrerror());
184 default: /* parent */
188 /* Parent continue here, waiting for child */
189 sigdefault.sa_flags = 0;
190 sigdefault.sa_handler = SIG_DFL;
191 sigfillset(&sigdefault.sa_mask);
193 sigaction(sig, &sigdefault, NULL);
195 Dmsg0(500, "Doing waitpid\n");
196 waitpid(pid, NULL, 0); /* wait for child to produce dump */
197 Dmsg0(500, "Done waitpid\n");
198 fprintf(stderr, _("Traceback complete, attempting cleanup ...\n"));
199 /* print information about the current state into working/<file>.bactrace */
201 exit_handler(sig); /* clean up if possible */
202 Dmsg0(500, "Done exit_handler\n");
204 Dmsg0(500, "Doing sleep\n");
207 fprintf(stderr, _("It looks like the traceback worked ...\n"));
215 * Init stack dump by saving main process id --
216 * needed by debugger to attach to this program.
218 void init_stack_dump(void)
220 main_pid = getpid(); /* save main thread's pid */
226 void init_signals(void terminate(int sig))
228 struct sigaction sighandle;
229 struct sigaction sigignore;
230 struct sigaction sigdefault;
234 exit_handler = terminate;
235 if (BA_NSIG < _sys_nsig)
236 Emsg2(M_ABORT, 0, _("BA_NSIG too small (%d) should be (%d)\n"), BA_NSIG, _sys_nsig);
238 for (i=0; i<_sys_nsig; i++)
239 sig_names[i] = _sys_siglist[i];
241 exit_handler = terminate;
242 sig_names[0] = _("UNKNOWN SIGNAL");
243 sig_names[SIGHUP] = _("Hangup");
244 sig_names[SIGINT] = _("Interrupt");
245 sig_names[SIGQUIT] = _("Quit");
246 sig_names[SIGILL] = _("Illegal instruction");;
247 sig_names[SIGTRAP] = _("Trace/Breakpoint trap");
248 sig_names[SIGABRT] = _("Abort");
250 sig_names[SIGEMT] = _("EMT instruction (Emulation Trap)");
253 sig_names[SIGIOT] = _("IOT trap");
255 sig_names[SIGBUS] = _("BUS error");
256 sig_names[SIGFPE] = _("Floating-point exception");
257 sig_names[SIGKILL] = _("Kill, unblockable");
258 sig_names[SIGUSR1] = _("User-defined signal 1");
259 sig_names[SIGSEGV] = _("Segmentation violation");
260 sig_names[SIGUSR2] = _("User-defined signal 2");
261 sig_names[SIGPIPE] = _("Broken pipe");
262 sig_names[SIGALRM] = _("Alarm clock");
263 sig_names[SIGTERM] = _("Termination");
265 sig_names[SIGSTKFLT] = _("Stack fault");
267 sig_names[SIGCHLD] = _("Child status has changed");
268 sig_names[SIGCONT] = _("Continue");
269 sig_names[SIGSTOP] = _("Stop, unblockable");
270 sig_names[SIGTSTP] = _("Keyboard stop");
271 sig_names[SIGTTIN] = _("Background read from tty");
272 sig_names[SIGTTOU] = _("Background write to tty");
273 sig_names[SIGURG] = _("Urgent condition on socket");
274 sig_names[SIGXCPU] = _("CPU limit exceeded");
275 sig_names[SIGXFSZ] = _("File size limit exceeded");
276 sig_names[SIGVTALRM] = _("Virtual alarm clock");
277 sig_names[SIGPROF] = _("Profiling alarm clock");
278 sig_names[SIGWINCH] = _("Window size change");
279 sig_names[SIGIO] = _("I/O now possible");
281 sig_names[SIGPWR] = _("Power failure restart");
284 sig_names[SIGWAITING] = _("No runnable lwp");
287 sig_names[SIGLWP] = _("SIGLWP special signal used by thread library");
290 sig_names[SIGFREEZE] = _("Checkpoint Freeze");
293 sig_names[SIGTHAW] = _("Checkpoint Thaw");
296 sig_names[SIGCANCEL] = _("Thread Cancellation");
299 sig_names[SIGLOST] = _("Resource Lost (e.g. record-lock lost)");
304 /* Now setup signal handlers */
305 sighandle.sa_flags = 0;
306 sighandle.sa_handler = signal_handler;
307 sigfillset(&sighandle.sa_mask);
308 sigignore.sa_flags = 0;
309 sigignore.sa_handler = SIG_IGN;
310 sigfillset(&sigignore.sa_mask);
311 sigdefault.sa_flags = 0;
312 sigdefault.sa_handler = SIG_DFL;
313 sigfillset(&sigdefault.sa_mask);
316 sigaction(SIGPIPE, &sigignore, NULL);
317 sigaction(SIGCHLD, &sighandle, NULL);
318 sigaction(SIGCONT, &sigignore, NULL);
319 sigaction(SIGPROF, &sigignore, NULL);
320 sigaction(SIGWINCH, &sigignore, NULL);
321 sigaction(SIGIO, &sighandle, NULL);
323 sigaction(SIGINT, &sigdefault, NULL);
324 sigaction(SIGXCPU, &sigdefault, NULL);
325 sigaction(SIGXFSZ, &sigdefault, NULL);
327 sigaction(SIGHUP, &sigignore, NULL);
328 sigaction(SIGQUIT, &sighandle, NULL);
329 sigaction(SIGILL, &sighandle, NULL);
330 sigaction(SIGTRAP, &sighandle, NULL);
331 sigaction(SIGABRT, &sighandle, NULL);
333 sigaction(SIGEMT, &sighandle, NULL);
336 sigaction(SIGIOT, &sighandle, NULL);
338 sigaction(SIGBUS, &sighandle, NULL);
339 sigaction(SIGFPE, &sighandle, NULL);
340 /* sigaction(SIGKILL, &sighandle, NULL); cannot be trapped */
341 sigaction(SIGUSR1, &sighandle, NULL);
342 sigaction(SIGSEGV, &sighandle, NULL);
343 sigaction(SIGUSR2, &sighandle, NULL);
344 sigaction(SIGALRM, &sighandle, NULL);
345 sigaction(SIGTERM, &sighandle, NULL);
347 sigaction(SIGSTKFLT, &sighandle, NULL);
349 /* sigaction(SIGSTOP, &sighandle, NULL); cannot be trapped */
350 sigaction(SIGTSTP, &sighandle, NULL);
351 sigaction(SIGTTIN, &sighandle, NULL);
352 sigaction(SIGTTOU, &sighandle, NULL);
353 sigaction(SIGURG, &sighandle, NULL);
354 sigaction(SIGVTALRM, &sighandle, NULL);
356 sigaction(SIGPWR, &sighandle, NULL);
359 sigaction(SIGWAITING,&sighandle, NULL);
362 sigaction(SIGLWP, &sighandle, NULL);
365 sigaction(SIGFREEZE, &sighandle, NULL);
368 sigaction(SIGTHAW, &sighandle, NULL);
371 sigaction(SIGCANCEL, &sighandle, NULL);
374 sigaction(SIGLOST, &sighandle, NULL);