Bug #75283 [NEW]: Disconnection not detected by socket_read()

From: privacy dot and dot spam dot protection at gmx dot fr Operating system: Debian PHP version: 7.0.24 Package: Sockets related Bug Type: Bug Bug description:Disconnection not detected by socket_read() Description: ------------ According to documentation, an empty string ("") is returned by socket_read() when there's no more data to read and false value on error (including if the remote host has closed the connection). However when socket_read has no data to read false is still returned. So it's impossible to detect if connection has been reseted by pear. Test script: --------------- $co = false; while (!$co) { $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP); if ($socket !== false) echo "OK 1.\n"; $result = socket_connect($socket, $address, $service_port); if ($socket !== false) { socket_set_option($socket, SOL_SOCKET, SO_RCVTIMEO, array("sec" => 1, "usec" => 1)); echo "OK 2.\n"; $co = true; } } while (true) { socket_clear_error($socket); $out = socket_read($socket, 2048); $socket_last_error = socket_last_error($socket); $strErr = socket_strerror($socket_last_error) . ' ' . $socket_last_error; echo date('Ymd H:i:s') . " : $strErr ($socket_last_error) => " . var_export($out, true) . PHP_EOL; } Expected result: ---------------- OK 1. Try connection '9.3.0.23' on port '30001'... OK 2. // client's connected on server // no data have been sent by server 20170929 11:09:17 : Success 0 (0) => '' 20170929 11:09:18 : Success 0 (0) => '' 20170929 11:09:19 : Success 0 (0) => '' //server send data 20170929 11:09:19 : Success 0 (0) => 'a' 20170929 11:09:19 : Success 0 (0) => 'a' 20170929 11:09:20 : Success 0 (0) => 'a' 20170929 11:09:20 : Success 0 (0) => 'a' 20170929 11:09:20 : Success 0 (0) => 'a' 20170929 11:09:20 : Success 0 (0) => 'a' 20170929 11:09:20 : Success 0 (0) => 'a' // no data have been sent by server 20170929 11:09:21 : Success 0 (0) => '' 20170929 11:09:22 : Success 0 (0) => '' 20170929 11:09:23 : Success 0 (0) => '' // connection is reset by server 20170929 11:09:24 : Resource temporarily unavailable 11 (11) => false 20170929 11:09:25 : Resource temporarily unavailable 11 (11) => false 20170929 11:09:26 : Resource temporarily unavailable 11 (11) => false 20170929 11:09:27 : Resource temporarily unavailable 11 (11) => false 20170929 11:09:28 : Resource temporarily unavailable 11 (11) => false Actual result: -------------- OK 1. Try connection '9.3.0.23' on port '30001'... OK 2. // client's connected on server // no data have been sent by server 20170929 11:09:17 : Resource temporarily unavailable 11 (11) => false 20170929 11:09:18 : Resource temporarily unavailable 11 (11) => false 20170929 11:09:19 : Resource temporarily unavailable 11 (11) => false //server send data 20170929 11:09:19 : Success 0 (0) => 'a' 20170929 11:09:19 : Success 0 (0) => 'a' 20170929 11:09:20 : Success 0 (0) => 'a' 20170929 11:09:20 : Success 0 (0) => 'a' 20170929 11:09:20 : Success 0 (0) => 'a' 20170929 11:09:20 : Success 0 (0) => 'a' 20170929 11:09:20 : Success 0 (0) => 'a' // no data have been sent by server 20170929 11:09:21 : Resource temporarily unavailable 11 (11) => false 20170929 11:09:22 : Resource temporarily unavailable 11 (11) => false 20170929 11:09:23 : Resource temporarily unavailable 11 (11) => false // connection is reset by server 20170929 11:09:24 : Resource temporarily unavailable 11 (11) => false 20170929 11:09:25 : Resource temporarily unavailable 11 (11) => false 20170929 11:09:26 : Resource temporarily unavailable 11 (11) => false 20170929 11:09:27 : Resource temporarily unavailable 11 (11) => false 20170929 11:09:28 : Resource temporarily unavailable 11 (11) => false -- Edit bug report at https://bugs.php.net/bug.php?id=75283&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=75283&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=75283&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=75283&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=75283&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=75283&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=75283&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=75283&r=needscript Try newer version: https://bugs.php.net/fix.php?id=75283&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=75283&r=support Expected behavior: https://bugs.php.net/fix.php?id=75283&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=75283&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=75283&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=75283&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=75283&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=75283&r=dst IIS Stability: https://bugs.php.net/fix.php?id=75283&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=75283&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=75283&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=75283&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=75283&r=mysqlcfg