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Disable recursive watchdog signal handler

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If we are in the signal handler, we don't want to handle
the signal again.  In extreme cases, this can cause a stack overflow
and segfault Redis.

Fixes #1771
This commit is contained in:
Matt Stancliff 2014-05-22 15:34:02 -04:00 committed by antirez
parent 88c2307535
commit 7a0c5fdf12
1 changed files with 1 additions and 1 deletions
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2
src/debug.c
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@ -947,7 +947,7 @@ void enableWatchdog(int period) {
/* Watchdog was actually disabled, so we have to setup the signal /* Watchdog was actually disabled, so we have to setup the signal
* handler. */ * handler. */
sigemptyset(&act.sa_mask); sigemptyset(&act.sa_mask);
act.sa_flags = SA_NODEFER | SA_ONSTACK | SA_SIGINFO; act.sa_flags = SA_ONSTACK | SA_SIGINFO;
act.sa_sigaction = watchdogSignalHandler; act.sa_sigaction = watchdogSignalHandler;
sigaction(SIGALRM, &act, NULL); sigaction(SIGALRM, &act, NULL);
} }