Description
bool
pcntl_signal ( int signo, mixed handle)
The pcntl_signal() function installs a new
signal handler for the signal indicated by
signo. The signal handler is set to
handler which may be the name of a user
created function, or either of the two global constants SIG_IGN
or SIG_DFL.
pcntl_signal() returns TRUE on success or
FALSE on failure.
Example 1. pcntl_signal() Example <?php
// signal handler function
function sig_handler($signo) {
switch($signo) {
case SIGTERM:
// handle shutdown tasks
exit;
break;
case SIGHUP:
// handle restart tasks
break;
case SIGUSR1:
print "Caught SIGUSR1...\n";
break;
default:
// handle all other signals
}
}
print "Installing signal handler...\n";
// setup signal handlers
pcntl_signal(SIGTERM, "sig_handler");
pcntl_signal(SIGHUP, "sig_handler");
pcntl_signal(SIGUSR1, "sig_handler");
print "Generating signal SIGTERM to self...\n";
// send SIGUSR1 to current process id
posix_kill(posix_getpid(), SIGUSR1);
print "Done\n"
?> |
|
See also pcntl_fork() and
pcntl_waitpid().