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Dump the debug buffer to libvirtd.log on fatal signal

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In case of imminent crash or upon request (signal USR2),
dump the logging buffer to the libvirtd.log file for
post-mortem analysis
* daemon/libvirtd.c: create a sig_fatal() handler connected to
  SIGFPE SIGSEGV SIGILL SIGABRT SIGBUS and SIGUSR2, just dumping
  the log buffer using virLogEmergencyDumpAll
This commit is contained in:
Daniel Veillard 2011-03-03 17:41:44 +08:00
parent 398553c157
commit a9f35c4863
1 changed files with 32 additions and 0 deletions
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32
daemon/libvirtd.c
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@ -246,6 +246,26 @@ static void sig_handler(int sig, siginfo_t * siginfo,
errno = origerrno;
}
static void sig_fatal(int sig, siginfo_t * siginfo ATTRIBUTE_UNUSED,
void* context ATTRIBUTE_UNUSED) {
struct sigaction sig_action;
int origerrno;
origerrno = errno;
virLogEmergencyDumpAll(sig);
/*
* If the signal is fatal, avoid looping over this handler
* by desactivating it
*/
if (sig != SIGUSR2) {
sig_action.sa_flags = SA_SIGINFO;
sig_action.sa_handler = SIG_IGN;
sigaction(sig, &sig_action, NULL);
}
errno = origerrno;
}
static void qemudDispatchClientEvent(int watch, int fd, int events, void *opaque);
static void qemudDispatchServerEvent(int watch, int fd, int events, void *opaque);
static int qemudStartWorker(struct qemud_server *server, struct qemud_worker *worker);
@ -3046,6 +3066,18 @@ daemonSetupSignals(struct qemud_server *server)
sigaction(SIGQUIT, &sig_action, NULL);
sigaction(SIGTERM, &sig_action, NULL);
/*
* catch fatal errors to dump a log, also hook to USR2 for dynamic
* debugging purposes or testing
*/
sig_action.sa_sigaction = sig_fatal;
sigaction(SIGFPE, &sig_action, NULL);
sigaction(SIGSEGV, &sig_action, NULL);
sigaction(SIGILL, &sig_action, NULL);
sigaction(SIGABRT, &sig_action, NULL);
sigaction(SIGBUS, &sig_action, NULL);
sigaction(SIGUSR2, &sig_action, NULL);
sig_action.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &sig_action, NULL);