ID: 28141 Updated by: [EMAIL PROTECTED] -Summary: socket_read return type: false vs "" Reported By: php at richardneill dot org -Status: Open +Status: Assigned Bug Type: Sockets related Operating System: Linux -PHP Version: 5.0.0RC1 +PHP Version: 5.0.0+ -Assigned To: +Assigned To: andrey New Comment:
Assigning to myself (to get notification if i forget), changing the version. Previous Comments: ------------------------------------------------------------------------ [2004-07-26 10:37:34] php at hristov dot com I will take a look later today or these days. But for now, the code in the function is : if (type == PHP_NORMAL_READ) { retval = php_read(php_sock->bsd_socket, tmpbuf, length, 0); } else { retval = recv(php_sock->bsd_socket, tmpbuf, length, 0); } if (retval == -1) { PHP_SOCKET_ERROR(php_sock, "unable to read from socket", errno); efree(tmpbuf); RETURN_FALSE; } ------------------------------------------------------------------------ [2004-07-26 01:18:08] php at richardneill dot org re-setting to open as requested by automatic email. Sorry - I think I confused your system by commenting as another user rather than as the original submitter. ------------------------------------------------------------------------ [2004-07-26 01:00:05] php-bugs at lists dot php dot net No feedback was provided for this bug for over a week, so it is being suspended automatically. If you are able to provide the information that was originally requested, please do so and change the status of the bug back to "Open". ------------------------------------------------------------------------ [2004-07-18 17:13:56] php2 at richardneill dot org I've still got the same thing happening in PHP5.0.0(final) I'm having some trouble with your example, so I'm using the attached instead. It's basically copied from the php-sockets manual, but slightly modified. The key point: according to the documentation, when (socket_read()===false), it means something has gone very wrong, i.e. a fatal error. However, in practice, all this means is that the other side has closed the connection. I'm running this code as ./testsock.php and the client is simply: netcat localhost 1111 The problem is that, if netcat is killed with Ctrl-C, then the server suffers a fatal error. I don't think that it should. I've tried it under both version php-cli-4.3.7-4mdk (the current devel version from Mandrake cooker) and php-5.0.0-cli which I just compiled. In both cases, the same thing happens. Regards Richard ------------------------------------- #!/usr/local/bin/php <?php error_reporting(E_ALL); /* Allow the script to hang around waiting for connections. */ set_time_limit(0); /* Turn on implicit output flushing so we see what we're getting as it comes in. */ ob_implicit_flush(); $address = '127.0.0.1'; $port = 1111; if (($sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) < 0) { echo "socket_create() failed: reason: " . socket_strerror($sock) . "\n"; }else{ echo "Created socket $sock\n"; } if (($ret = socket_bind($sock, $address, $port)) < 0) { echo "socket_bind() failed: reason: " . socket_strerror($ret) . "\n"; }else{ echo "Bound socket $sock to port $port on address $address\n"; } if (($ret = socket_listen($sock, 5)) < 0) { echo "socket_listen() failed: reason: " . socket_strerror($ret) . "\n"; }else{ echo "listening...\n"; } do { if (($msgsock = socket_accept($sock)) < 0) { echo "socket_accept() failed: reason: " . socket_strerror($msgsock) . "\n"; break; } /* Send instructions. */ $msg = "Welcome to the PHP Test Server.\nTo quit, type 'quit'. To shut down the server type 'shutdown'.\n". "To crash this server, quit netcat with Ctrl-C\n"; socket_write($msgsock, $msg, strlen($msg)); do { $buf = socket_read($msgsock, 2048, PHP_NORMAL_READ); if ($buf==''){ echo "Socket received an empty string.\n"; } if ($buf ===false){ echo "socket_read() failed: reason: " . socket_strerror($ret) . ". This shouldn't happen. Fatal exit.\n"; break 2; } /* According to the documentation, testing for socket_read being false is a sign of a fatal error, whereas an empty string is means the remote side has closed the connection. Actually both "" and false indicate the remote side has closed the connection. the socket_strerror isn't very helpful - it says "operation not permitted" */ $buf=trim($buf); #Trim whitespace. if ($buf == 'quit') { echo "Quit command received\n"; break; } if ($buf == 'shutdown') { socket_close($msgsock); echo "Shutdown command received\n"; break 2; } $talkback = "PHP: You said '$buf'.\n"; socket_write($msgsock, $talkback, strlen($talkback)); echo "$buf\n"; } while (true); socket_close($msgsock); echo "Closed msgsocket; waiting for another connection\n"; } while (true); socket_close($sock); echo "Closed main socket, exiting\n"; ?> ------------------------------------------------------------------------ [2004-07-18 14:29:51] [EMAIL PROTECTED] I cannot reproduce the problem with latest PHP5. Can you provide a *full* reproducing case. My scripts are : server: <?php error_reporting(E_ALL); set_time_limit(0); ob_implicit_flush(); $address = '127.0.0.1'; $port = 4322; if (($sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) < 0) { echo "socket_create() failed: reason: " . socket_strerror($sock) . "\n"; } if (($ret = socket_bind($sock, $address, $port)) < 0) { echo "socket_bind() failed: reason: " . socket_strerror($ret) . "\n"; } if (($ret = socket_listen($sock, 5)) < 0) { echo "socket_listen() failed: reason: " . socket_strerror($ret) . "\n"; } do { if (($msgsock = socket_accept($sock)) < 0) { echo "socket_accept() failed: reason: " . socket_strerror($msgsock) . "\n"; break; } $buffer=socket_read($msgsock,2048,PHP_NORMAL_READ); $buffer2=socket_read($msgsock,2048,PHP_NORMAL_READ); var_dump($buffer, $buffer2); if ($buffer===false){ echo "Error: socket_read() failed: reason: ".socket_strerror(socket_last_error())." \n"; break; } else if ($buffer=='') { echo "Socket $socket returned an empty string. Closing connection\n"; socket_close($socket); } else { echo "Received data".trim($buffer)."\n"; } socket_close($msgsock); } while (true); socket_close($sock); ?> client: <?php error_reporting(E_ALL); echo "TCP/IP Connection\n"; $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP); if ($socket < 0) { echo "socket_create() failed: reason: ".socket_strerror($socket)."\n"; } else { echo "OK.\n"; } echo "Attempting to connect to '127.0.0.1' on port '4322'..."; $result = socket_connect($socket, "127.0.0.1", 4322); if ($result < 0) { echo "socket_connect() failed.\nReason: ($result) ".socket_strerror($result) . "\n"; } else { echo "OK.\n"; } $s = "ALA\n"; socket_write($socket, $s); echo "Closing socket...";sleep(5); socket_close($socket); echo "OK.\n\n"; ?> ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at http://bugs.php.net/28141 -- Edit this bug report at http://bugs.php.net/?id=28141&edit=1