Bug #43627 [Com]: fopen blocks on fifo

Edit report at https://bugs.php.net/bug.php?id=43627&edit=1 ID: 43627 Comment by: php at richardneill dot org Reported by: user at example dot com Summary: fopen blocks on fifo Status: Bogus Type: Bug Package: Filesystem function related Operating System: Debian Etch and RHEL 5 PHP Version: 5.2.5 Block user comment: N Private report: N New Comment: Similarly, fopen blocks if the fifo is opened for writing, and the "other side" isn't being read yet: $fp = fopen('myfifo', 'w'); I'd expect the fwrite() to block, but not the fopen(). Linux's man fifo says that this is the default behaviour, but that it is possible to make it non-blocking. This would be useful, because we can't call stream_select() to find out whether writes would block until we have fopen()'d the pipe, but fopen() blocks. There is no way to test in advance whether fopen() would block, because most cases don't expect it to. Previous Comments: ------------------------------------------------------------------------ [2008-01-29 00:15:50] tony2001@php.net man open man 7 fifo "Normally, opening the FIFO blocks until the other end is opened also." ------------------------------------------------------------------------ [2007-12-18 16:59:10] user at example dot com Description: ------------ fopen() blocks waiting for read on named pipes (FIFOs) opened for reading. Reproduce code: --------------- At Unix prompt: % mkfifo myfifo PHP: $fp = fopen('myfifo', 'r'); Expected result: ---------------- PHP execution should continue until attempting to read from the FIFO, e.g.: fread($fp, 1); Actual result: -------------- PHP execution suspends (blocks) on the fopen() command until another process writes data to the FIFO. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=43627&edit=1