#40566 [Opn]: Fgets screws up php on a nonblocked socket

ID: 40566 User updated by: myself at ligesh dot com Reported By: myself at ligesh dot com Status: Open Bug Type: Sockets related Operating System: Linux PHP Version: 5.2.1 New Comment: OK, i checked with 5.2.0 and it works as expected. Also note that i am using "-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64" at compile time. Though i don't how this can affect the socket operations. Also the php-5.20 which is working fine, is also compiled with LARGEFILE_SOURCE. So it is something in php 5.2.1 that's causing teh problem. Previous Comments: ------------------------------------------------------------------------ [2007-02-20 20:59:03] myself at ligesh dot com Ok, Below is the code that will produce it. The fread should return immediately, and the php should print the message, and then sleep for 1 second, and continue. But instead, u will see php will go into manic loop, INSIDE the fgets, and will not return. There is no problem if it is in blocking mode. The function will not return, but it doesn't become crazy. The version is php 5.2.1. <?php $fd = stream_socket_client("ssl://localhost:443"); stream_set_blocking($fd, false); while (true) { $res = fread($fd, 1024); print("Got something $res\n"); print("\n"); sleep(1); } ------------------------------------------------------------------------ [2007-02-20 20:45:18] tony2001@php.net Thank you for this bug report. To properly diagnose the problem, we need a short but complete example script to be able to reproduce this bug ourselves. A proper reproducing script starts with <?php and ends with ?>, is max. 10-20 lines long and does not require any external resources such as databases, etc. If the script requires a database to demonstrate the issue, please make sure it creates all necessary tables, stored procedures etc. Please avoid embedding huge scripts into the report. Cannot reproduce. ------------------------------------------------------------------------ [2007-02-20 20:36:51] myself at ligesh dot com Description: ------------ If i do an fgets on a socket that has been noblocked using stream_set_blocking($fp, false);, then php goes into a loop. stream_set_blocking($socket, false); fgets($socket, 1024); Instead of returning instantly at teh fgets, php goes into an internal loop. The strace is: -------------- read(4, 0x98b9180, 5) = -1 EAGAIN (Resource temporarily unavailable) Continiously repeated. -------------------- This is a very nasty bug, and i am really suprised how it got in there. It was working fine with 5.2.0, but i made a mistake of upgrading to 5.2.1 and my major program has completely broken down. Reproduce code: --------------- ---------- $fd = stream_socket_client("ssl://$serv_addr:$serv_port") stream_set_blocking($fd, false); fgets($fd, 1024); ------------- Expected result: ---------------- Return immediately. Actual result: -------------- Goes into a manic loop of read returning einval. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=40566&edit=1