#35079 [Opn->Fbk]: stream_set_blocking(true) toggles, not enables blocking

ID: 35079 Updated by: sniper@php.net Reported By: askalski at gmail dot com -Status: Open +Status: Feedback Bug Type: Filesystem function related Operating System: linux PHP Version: 5.0.5 New Comment: Please try using this CVS snapshot: http://snaps.php.net/php5-latest.tar.gz For Windows: http://snaps.php.net/win32/php5-win32-latest.zip Previous Comments: ------------------------------------------------------------------------ [2005-11-03 05:55:11] askalski at gmail dot com Description: ------------ main/streams/plain_wrapper.c (5.0.5) main/streams.c (4.4 and earlier) In several places, the ^= operator is used to turn off a flag. This is incorrect. For example, stream_set_blocking() on a plain file hits this code in php_stdiop_set_option(): if (value) flags ^= O_NONBLOCK; else flags |= O_NONBLOCK; This should be: if (value) flags &= ~O_NONBLOCK; else flags |= O_NONBLOCK; The same error is repeated elsewhere in the code. Reproduce code: --------------- $fp = fopen("test", "w"); stream_set_blocking($fp, true); stream_set_blocking($fp, true); stream_set_blocking($fp, true); stream_set_blocking($fp, true); fclose($fp); Expected result: ---------------- The stream should remain in blocking mode throughout the script execution. Actual result: -------------- Here is abridged strace output showing the errant behavior. Notice how O_NONBLOCK is being turned on and off alternately. open("/home/askalski/test", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 4 fcntl64(4, F_SETFL, O_WRONLY|O_NONBLOCK) = 0 fcntl64(4, F_SETFL, O_WRONLY) = 0 fcntl64(4, F_SETFL, O_WRONLY|O_NONBLOCK) = 0 fcntl64(4, F_SETFL, O_WRONLY) = 0 close(4) = 0 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=35079&edit=1