From: rherror404 at gmail dot com Operating system: Windows PHP version: 5.2.0 PHP Bug Type: Program Execution Bug description: proc_open() descriptor spec for STDOUT append starts writing from beginning
Description: ------------ Defining the descriptor spec for STDOUT for a call to proc_open() to append to a file instead starts writing from beginning (not at the end as one would expect). C:\WINDOWS\Temp>php launch1.php Reproduce code: --------------- C:\WINDOWS\Temp>type launch1.php <? $dspec = array(0 => array("pipe", "r") , 1 => array("file", 'C:\WINDOWS\TEMP\launch_stdout.txt', "a") , 2 => array("file", 'C:\WINDOWS\TEMP\launch_stderr.txt', "a") ); $i = 5; $inputpackage = serialize($i); $proc = proc_open('php C:\WINDOWS\TEMP\launch2.php', $dspec, $pipes); if ( is_resource($proc) ) {fwrite($pipes[0], $inputpackage); fclose($pipes[0]); proc_close($proc);} $i = 2; $inputpackage = serialize($i); $proc = proc_open('php C:\WINDOWS\TEMP\launch2.php', $dspec, $pipes); if ( is_resource($proc) ) {fwrite($pipes[0], $inputpackage); fclose($pipes[0]); proc_close($proc);} exit(); ?> C:\WINDOWS\Temp>type launch2.php <? function tostdout( $x ) {echo date('[Y-m-d H:i:s (T P)]') . " <PID " . getmypid( ) . "> $x\r\n";} $inbuffer = fgets(STDIN, 8192); $i = unserialize($inbuffer); for ( $j = 0; $j < $i; $j++ ) {tostdout("$j : $i"); sleep(1);} exit(); ?> C:\WINDOWS\Temp> Expected result: ---------------- C:\WINDOWS\Temp>type launch_stdout.txt [2006-11-27 16:33:53 (CST -06:00)] <PID 4492> 0 : 5 [2006-11-27 16:33:54 (CST -06:00)] <PID 4492> 1 : 5 [2006-11-27 16:33:55 (CST -06:00)] <PID 4492> 2 : 5 [2006-11-27 16:33:56 (CST -06:00)] <PID 4492> 3 : 5 [2006-11-27 16:33:57 (CST -06:00)] <PID 4492> 4 : 5 [2006-11-27 16:33:58 (CST -06:00)] <PID 6808> 0 : 2 [2006-11-27 16:33:59 (CST -06:00)] <PID 6808> 1 : 2 /* I would expect the second process to append its output to (the end of) the output of the first process. */ Actual result: -------------- C:\WINDOWS\Temp>type launch_stdout.txt [2006-11-27 16:33:58 (CST -06:00)] <PID 6808> 0 : 2 [2006-11-27 16:33:59 (CST -06:00)] <PID 6808> 1 : 2 [2006-11-27 16:33:55 (CST -06:00)] <PID 4492> 2 : 5 [2006-11-27 16:33:56 (CST -06:00)] <PID 4492> 3 : 5 [2006-11-27 16:33:57 (CST -06:00)] <PID 4492> 4 : 5 /* The second process has over-written lines one and two of the output of the first process. */ -- Edit bug report at http://bugs.php.net/?id=39651&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=39651&r=trysnapshot44 Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=39651&r=trysnapshot52 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=39651&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=39651&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=39651&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=39651&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=39651&r=needscript Try newer version: http://bugs.php.net/fix.php?id=39651&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=39651&r=support Expected behavior: http://bugs.php.net/fix.php?id=39651&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=39651&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=39651&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=39651&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=39651&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=39651&r=dst IIS Stability: http://bugs.php.net/fix.php?id=39651&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=39651&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=39651&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=39651&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=39651&r=mysqlcfg