#44614 [Opn->Fbk]: signal handlers fail to execute when signal interrupts a socket_select

 ID:               44614
 Updated by:       [email protected]
 Reported By:      dan at auctionharmony dot com
-Status:           Open
+Status:           Feedback
 Bug Type:         PCNTL related
 Operating System: Linux
 PHP Version:      5.2.6RC3
 New Comment:

I can't reproduce with the following code:

<?php
declare(ticks=1);

function sig_handler($signo) {
        echo __FUNCTION__ . " called\n";
}
pcntl_signal(SIGINT, "sig_handler");

$socket = socket_create_listen(1234);
$read = array($socket);
$n = NULL;
$foo = socket_select($read, $n, $n, NULL);
?>

The signal handler is called just after socket_select returns.



Previous Comments:
------------------------------------------------------------------------

[2008-04-02 15:24:44] dan at auctionharmony dot com

Description:
------------
When waiting in a socket_select (and presumably a stream_select, but I
have not tested it) a previously set signal handler is not executed when
a signal is received.  The select returns false as would be expected.

The analog code in C is also attached.  It correctly executes the
signal handler.

Tested on PHP 5.1.6(CentOS), 5.2.6_rc1(Gentoo), 5.2.6-rc3(Gentoo)

Reproduce code:
---------------
//PHP: when SIGINT is recieved, socket_select returns false,
sig_handler is not run
pcntl_signal(SIGINT, "sig_handler");
$sock = socket_create_listen($port);
$read_socks = array($sock);
$n = NULL;
$foo = socket_select($read_socks, $n, $n, NULL);

//C: when SIGINT is recieved, select returns -1, sig_handler is run
signal(SIGINT, sig_handler);
int sockfd = socket(PF_INET, SOCK_STREAM, 0); // do some error
bind(sockfd, (struct sockaddr *)&my_addr, sizeof my_addr);
listen(sockfd, 10);

fd_set read_fds;
FD_ZERO(&read_fds);
FD_SET(sockfd, &read_fds);

select(sockfd+1, &read_fds, NULL, NULL, NULL)


Expected result:
----------------
I expect the result to be like the equivalent C where the signal
handler is run and select returns error.

Actual result:
--------------
Select returns false, but unlike the equivalent C the signal handler is
not run


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