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allocate alternate signal stack, change of sigaction flags for sigterm

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Premysl Hruby 2012-04-03 17:40:31 +02:00
parent 84e5684bca
commit c575766202
1 changed files with 13 additions and 1 deletions
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14
src/redis.c
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@ -61,6 +61,9 @@ double R_Zero, R_PosInf, R_NegInf, R_Nan;
/*================================= Globals ================================= */
/* Alternate stack for SIGSEGV/etc handlers */
char altstack[SIGSTKSZ];
/* Global vars */
struct redisServer server; /* server global state */
struct redisCommand *commandTable;
@ -2319,15 +2322,24 @@ static void sigtermHandler(int sig) {
void setupSignalHandlers(void) {
struct sigaction act;
stack_t stack;
stack.ss_sp = altstack;
stack.ss_flags = 0;
stack.ss_size = SIGSTKSZ;
sigaltstack(&stack, NULL);
/* When the SA_SIGINFO flag is set in sa_flags then sa_sigaction is used.
* Otherwise, sa_handler is used. */
sigemptyset(&act.sa_mask);
act.sa_flags = SA_NODEFER | SA_ONSTACK | SA_RESETHAND;
act.sa_flags = 0;
act.sa_handler = sigtermHandler;
sigaction(SIGTERM, &act, NULL);
#ifdef HAVE_BACKTRACE
/* Use alternate stack so we don't clobber stack in case of segv, or when we run out of stack ..
* also resethand & nodefer so we can get interrupted (and killed) if we cause SEGV during SEGV handler */
sigemptyset(&act.sa_mask);
act.sa_flags = SA_NODEFER | SA_ONSTACK | SA_RESETHAND | SA_SIGINFO;
act.sa_sigaction = sigsegvHandler;