Bug #15906 Updated: pcntl_signal() does not work while waiting with socket_accept()

ID: 15906 Updated by: jason@php.net Reported By: christophe.dirac@swissphone.ch -Status: Open +Status: Bogus Bug Type: Unknown/Other Function Operating System: SuSE 7.0 Kernel 2.2.17 PHP Version: 4.1.1 New Comment: Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php This is because pcntl uses system call restarting, which means that it will notice the signal, store that it occured, then resume the call to the function after the io operation completes. This is usually desireable because it prevents data errors. I could possibly add an option to pcntl_signal that would not restart system calls. If this is desirable to you submit a feature request. Thanks, -Jason Previous Comments: ------------------------------------------------------------------------ [2002-03-06 11:42:43] christophe.dirac@swissphone.ch Configure Command: ./configure --with-imap --with-mysql --enable-sockets --enable-pcntl Example: #! /usr/local/bin/php -q <?php error_reporting(E_ALL); set_time_limit(0); function sig_handler($signo) { switch($signo) { case SIGTERM: // handle shutdown tasks echo "Got SIGTERM! Closing sockets and exiting...\n"; @socket_close($msgsock); @socket_close($sock); exit; break; case SIGINT: // handle shutdown tasks echo "Got SIGINT! Closing sockets and exiting...\n"; @socket_close($msgsock); @socket_close($sock); exit; break; default: // handle all other signals } } $address = "127.0.0.1"; $port = 5550; echo "Installing signal handler...\n"; if (pcntl_signal(SIGTERM, "sig_handler")) echo "SIGTERM installed!\n"; if (pcntl_signal(SIGINT, "sig_handler")) echo "SIGINT installed!\n"; if (($sock = socket_create(AF_INET, SOCK_STREAM, 0)) < 0) { echo "socket_create() failed: reason: " . strerror($sock) . "\n"; exit; } if (($ret = socket_bind($sock, $address, $port)) < 0) { echo "socket_bind() failed: reason: " . strerror($ret) . "\n"; exit; } if (($ret = socket_listen($sock, 5)) < 0) { echo "socket_listen() failed: reason: " . strerror($ret) . "\n"; exit; } do { echo "Listening...\n"; if (($msgsock = socket_accept($sock)) < 0) { echo "socket_accept() failed: reason: " . strerror($msgsock) . "\n"; break; } else { socket_write($msgsock, "READY\n", 6); } do { break 1; } while(true); socket_close($msgsock); } while(true); socket_close($sock); ---END--- This peace of code is waiting for a socket connection with socket_accept() and has installed signal handlers for SIGINT and SIGTERM! I'm expecting that catching signal SIGINT should enter the function sig_handler() even if the script is waiting for a connection at this moment. That does not happen, any signal installed with pcntl_signal() is ignored (of course not SIGKIL) while waiting for connections with socket_accept(). The script does not enter the function sig_handler(). Kind regards Chris ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=15906&edit=1