/* {{{ zend_sigaction
* Register a signal handler that will be deferred in critical sections */
ZEND_API int zend_sigaction(int signo, const struct sigaction *act, struct sigaction *oldact)
{
struct sigaction sa = {{0}};
sigset_t sigset;
if (oldact != NULL) {
oldact->sa_flags = SIGG(handlers)[signo-1].flags;
oldact->sa_handler = (void *) SIGG(handlers)[signo-1].handler;
oldact->sa_mask = global_sigmask;
}
if (act != NULL) {
SIGG(handlers)[signo-1].flags = act->sa_flags;
if (act->sa_flags & SA_SIGINFO) {
SIGG(handlers)[signo-1].handler = (void *) act->sa_sigaction;
} else {
SIGG(handlers)[signo-1].handler = (void *) act->sa_handler;
}
sa.sa_flags = SA_SIGINFO | (act->sa_flags & SA_FLAGS_MASK);
sa.sa_sigaction = zend_signal_handler_defer;
sa.sa_mask = global_sigmask;
if (sigaction(signo, &sa, NULL) < 0) {
zend_error_noreturn(E_ERROR, "Error installing signal handler for %d", signo);
}
/* unsure this signal is not blocked */
sigemptyset(&sigset);
sigaddset(&sigset, signo);
zend_sigprocmask(SIG_UNBLOCK, &sigset, NULL);
}
return SUCCESS;
}
/* {{{ zend_signal_handler
* Call the previously registered handler for a signal
*/
static void zend_signal_handler(int signo, siginfo_t *siginfo, void *context)
{
int errno_save = errno;
struct sigaction sa;
sigset_t sigset;
zend_signal_entry_t p_sig = SIGG(handlers)[signo-1];
if (p_sig.handler == SIG_DFL) { /* raise default handler */
if (sigaction(signo, NULL, &sa) == 0) {
sa.sa_handler = SIG_DFL;
sigemptyset(&sa.sa_mask);
sigemptyset(&sigset);
sigaddset(&sigset, signo);
if (sigaction(signo, &sa, NULL) == 0) {
/* throw away any blocked signals */
zend_sigprocmask(SIG_UNBLOCK, &sigset, NULL);
#ifdef ZTS
# define RAISE_ERROR "raise() failed\n"
if (raise(signo) != 0) {
/* On some systems raise() fails with errno 3: No such process */
kill(getpid(), signo);
}
#else
kill(getpid(), signo);
#endif
}
}
} else {
if (p_sig.flags & SA_SIGINFO) {
if (p_sig.flags & SA_RESETHAND) {
SIGG(handlers)[signo-1].flags = 0;
SIGG(handlers)[signo-1].handler = SIG_DFL;
}
(*(void (*)(int, siginfo_t*, void*))p_sig.handler)(signo, siginfo, context);
} else {
(*(void (*)(int))p_sig.handler)(signo);
}
}
errno = errno_save;
} /* }}} */
