#39598 [NEW]: error verification after fwrite()

From: max at nucleus dot it Operating system: Linux PHP version: 5.2.0 PHP Bug Type: Streams related Bug description: error verification after fwrite() Description: ------------ The documentation states tha fwrite() returns false in case of error, but it doesn't do so if the actual write fails. For example if I asynchronously write to a pipe (such as those obtained by proc_open()) I and the pipe is not ready or is broken, fwrite() returns 0. This could be a correct behaviour it I had a way to determine the error. The problem is that EAGAIN or EPIPE are completely impossible to determine and I can't know if I need to wait or I have to close the stream. A possible solution would be to implement ferror() or errno. Reproduce code: --------------- $Proc = proc_open($Cmd, $Streams, $Pipes, $CWD, $Env); stream_set_blocking($Pipes[0], 0); $Result = fwrite($Pipes[0], "test"); // If $Pipes[0] is not ready to receive data // $Result is 0, but I can't know why. // The real code I'm writing involves // stream_select() and repeated reads and writes // on multiple pipes. Expected result: ---------------- fwrite() should return 0 when the stream is asynchrounous, the C write() returns 0 and errno is EAGAIN. fwrite() should return false in all other cases where the C write() returns 0. Alternatively a way to access ferror() or errno is needed. -- Edit bug report at http://bugs.php.net/?id=39598&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=39598&r=trysnapshot44 Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=39598&r=trysnapshot52 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=39598&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=39598&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=39598&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=39598&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=39598&r=needscript Try newer version: http://bugs.php.net/fix.php?id=39598&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=39598&r=support Expected behavior: http://bugs.php.net/fix.php?id=39598&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=39598&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=39598&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=39598&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=39598&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=39598&r=dst IIS Stability: http://bugs.php.net/fix.php?id=39598&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=39598&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=39598&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=39598&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=39598&r=mysqlcfg