Bug #69049 [Opn->Fbk]: Unable to get output of slow process

Edit report at https://bugs.php.net/bug.php?id=69049&edit=1 ID: 69049 Updated by: ab@php.net Reported by: aserbulov at parallels dot com Summary: Unable to get output of slow process -Status: Open +Status: Feedback Type: Bug Package: Streams related Operating System: Windows PHP Version: 5.5.21 Block user comment: N Private report: N New Comment: Hi, thanks for the report. Just removing that part doesn't seem to be a correct solution. Please reread the tickets you've linked for why it was done so. With the particular issue, you can still implement it with a slow process. I'd suggest to not to close strerr but read from it simultaneously. You expect a keyword 'done' from the stdout, but that doesn't prevent you to read some kind of keep-alive stuff from stderr. You might also look up some example in the tests appended with the bug #51800. Of course it's bad when not having control over process.php . I was thinking about introducing a userspace function to peek on the pipe content. Another possibility were to introduce one more option to proc_open which would set the expected timeout. But none of that is yet done, lets see whether it's needed at all. Thanks. Previous Comments: ------------------------------------------------------------------------ [2015-02-13 05:44:25] aserbulov at parallels dot com Description: ------------ If you use proc_open to open slow process (it should write to stdout not immediately, but after some time), you never get process output. Slow process emulation: --- <?php sleep(60); // Do some work fwrite(STDOUT, 'done'); exit(0); --- It is side effect of bug https://bugs.php.net/bug.php?id=51800 fix. Test script: --------------- $cmd = "\"C:/Program Files/php/php.exe\" process.php"; $status; $stdout = ""; $pipes = []; $descriptors = [ 0 => ["pipe", "r"], // stdin 1 => ["pipe", "w"], // stdout 2 => ["pipe", "w"], // stderr ]; $process = proc_open($cmd, $descriptors, $pipes); fclose($pipes[0]); fclose($pipes[2]); while (!feof($pipes[1])) $stdout .= fread($pipes[1], 1024); fclose($pipes[1]); $status = proc_close($process); print_r(["status" => $status, "stdout" => $stdout]); Expected result: ---------------- 1. fread() function should read the pipe until the desired number of bytes has been read or reaches the end of the pipe. 2. feof() function should return true if fread() function reaches the end of the pipe. Actual result: -------------- 1. fread() return empty string 2. feof($pipes[1]) return true after ~36 seconds. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=69049&edit=1