From: [EMAIL PROTECTED]
Operating system: Linux
PHP version: 4.2.3
PHP Bug Type: Sockets related
Bug description: socket_accept() in blocking mode doesn't handle signal interrupts
The socket_accept() function doesn't appear to handle kernel level system
interrupts. This is a problem because PHP scripts written to use
pcntl_signal() won't be executed while socket_accept() is in blocking
mode. THAT is a problem because the script can't be killed with:
kill -s SIGUSR1 [pid]
and can't reap zombie processes when SIGCHLD is given (not that is much of
a problem on Linux, since you can use SIG_IGN).
A workaround I've made is to set a socket to non-blocking mode:
socket_set_nonblock($hSocket);
And then use a while loop like so:
while (($hClient = @socket_accept($hSocket)) === false) {
// If this is a real error, we need to handle it. Unfortunately, in
this
// event we just die() essentially.
if (!is_resource($hSocket)) {
error_log(socket_strerror(socket_last_error($hSocket)));
exit;
}
// We need to sleep for one second so that CPU isn't absorbed with
this
// process. This may seem clunky, but select() doesn't appear to
work
// correctly with accept() in PHP in blocking mode (that is EINTR
does
// not appear to work correctly), thus preventing signals from
being
// received. This, in effect, makes the process unkillable. This is
the
// workaround, for the moment.
sleep(1);
}
While this works, it would be much better if it just returned when a
system interrupt is given like the C-equivalent does. This works because
the system can't receive messages from the kernel because it isn't
blocking.
--
Edit bug report at http://bugs.php.net/?id=20745&edit=1
--
Try a CVS snapshot: http://bugs.php.net/fix.php?id=20745&r=trysnapshot
Fixed in CVS: http://bugs.php.net/fix.php?id=20745&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=20745&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=20745&r=needtrace
Try newer version: http://bugs.php.net/fix.php?id=20745&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=20745&r=support
Expected behavior: http://bugs.php.net/fix.php?id=20745&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=20745&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=20745&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=20745&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=20745&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=20745&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=20745&r=isapi
