ID: 47192
Comment by: fmassei at gmail dot com
Reported By: fmassei at gmail dot com
Status: Open
Bug Type: Feature/Change Request
Operating System: linux
PHP Version: 5.2.8
New Comment:
Quick and dirty workaround: create a child process for resolving the
hostname and let the parent manage the signals.
<?php
/* signal handling */
declare(ticks=1);
function sa($signo) {
global $pid;
echo "Received signal $signo (with child $pid)\n";
/* check if the pid is zero: thus it will work even if the
behaviour of this
* function will be fixed in the future. */
if ($pid!=0)
posix_kill($pid, SIGKILL); /* the only possible signal */
}
/* register the signal */
pcntl_signal(SIGALRM, "sa");
/* get an ipc queue */
if (($sysId = ftok("/tmp/pr", "a"))===-1)
die("Could not ftok\n");
$key_t = msg_get_queue($sysId);
/* ipc message type based on parent's pid */
$msgtype = posix_getpid();
/* fork */
$pid = pcntl_fork();
if ($pid==-1) {
echo "Failed to fork.\n";
exit(1);
} else if ($pid==0) {
/* child process */
$ip = gethostbyname($hostname);
msg_send($key_t, $msgtype, $ip, true, false, $err);
exit(0);
} else {
/* parent process */
pcntl_alarm(5); /* timeout before giving up */
if (msg_receive($key_t, $msgtype, $type, 100, $msg, true, 0,
$err)===false)
echo("receive failed.\n");
else echo $msg."\n";
pcntl_alarm(0);
}
/* clean and finish */
msg_remove_queue($key_t);
echo "Done.\n";
?>
Previous Comments:
------------------------------------------------------------------------
[2009-01-25 16:00:08] fmassei at gmail dot com
well, it actually IS a bug, as long as the "pcntl_" functions are not
working as described for this function only.
------------------------------------------------------------------------
[2009-01-24 23:55:06] [email protected]
No, it's a change request since this function is not designed to do
what you ask. Not everything is a bug..
------------------------------------------------------------------------
[2009-01-23 13:52:04] fmassei at gmail dot com
Somehow I posted this bug in the wrong category. It's not a
"Feature/Change Request" but more a "Network related" bug.
------------------------------------------------------------------------
[2009-01-22 18:13:35] fmassei at gmail dot com
Description:
------------
gethostbyname() is not interruptible by signals. If it cannot resolve
an hostname there is no way it can be interrupted except for a SIGKILL.
Reproduce code:
---------------
declare(ticks=1);
function al($sig)
{
echo $sig;
exit(0);
}
pcntl_signal(SIGINT, "al");
pcntl_signal(SIGTERM, "al");
pcntl_signal(SIGALRM, "al");
pcntl_alarm(3);
echo gethostbyname("google.com");
Expected result:
----------------
I was expected to interrupt gethostbyname() with any signal.
Actual result:
--------------
When running the above code, if the system cannot resolve google's
hostname, the function blocks and doesn't respond to any signal.
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=47192&edit=1
