#35086 [Opn->Fbk]: socket_read does not return empty string after receiving '\n'

ID: 35086 Updated by: sniper@php.net Reported By: jelte dot werkhoven at cruisetravel dot nl -Status: Open +Status: Feedback Bug Type: Sockets related Operating System: GNU/Linux (SuSE 10.0) PHP Version: 4.4.1 New Comment: Try 'var_dump($out);' before those 'if' clauses. Previous Comments: ------------------------------------------------------------------------ [2005-11-03 14:41:00] jelte dot werkhoven at cruisetravel dot nl Description: ------------ This seems to be a replica of bug #21880, but I can replicate it each time. I've got a proxy daemon written in C that terminates data with a line break (linux '\n'). As I understand it, this should cause socket_read to return an empty string, if called with the PHP_NORMAL_READ flag. However, it doesn't and just hangs. BTW, version is PHP 4.4.0 CLI. Connecting to said proxy daemon with either netcat or telnet works as expected. Reproduce code: --------------- /* Get the port for the WWW service. */ $service_port = 8001; /* Get the IP address for the target host. */ $address = gethostbyname('localhost'); /* Create a TCP/IP socket. */ $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP); if ($socket < 0) { echo "socket_create() failed: reason: " . socket_strerror($socket) . "\n"; } else { echo "OK got socket.\n"; } echo "Attempting to connect to '$address' on port '$service_port'..."; $result = @socket_connect($socket, $address, $service_port); if (!$result) { die("socket_connect() failed.\nReason: " . socket_strerror(socket_last_error()) . "\n"); } else { echo "OK got connection.\n"; } $in = "REQ\n"; $out = ''; socket_write($socket, $in, strlen($in)); echo "OK wrote connection string '$in'.\n"; echo "Reading daemon response:\n"; while( $out = socket_read($socket, 2048, PHP_NORMAL_READ) ) { //if( strncmp( $out, 'ACK', 3 ) == 0 ) break; if( $out === false ) echo "FALSE!"; if( $out == '' ) echo "ZILCH!"; } Expected result: ---------------- Commented out strncmp line is workaround, without it, it never breaks out of the while loop which I think it should. I figure it should echo either ZILCH on receiving '\n' which is prepended to the ACK reply of the daemon, or FALSE as the daemon disconnects after sending the ACK string. If I use it with the workaround I can actually see that the line terminator is sent because PHP echo's it when I echo the $out string. Actual result: -------------- OK got socket. Attempting to connect to '127.0.0.1' on port '8001'...OK got connection. OK wrote connection string 'REQ '. Reading daemon response: And it hangs indefinately. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=35086&edit=1