Bug #69900 [Opn->Fbk]: Commandline input/output weird behaviour

Edit report at https://bugs.php.net/bug.php?id=69900&edit=1 ID: 69900 Updated by: ab@php.net Reported by: nerdbeere2k at gmail dot com Summary: Commandline input/output weird behaviour -Status: Open +Status: Feedback Type: Bug Package: *General Issues Operating System: Linux, Windows PHP Version: 5.5.26 Block user comment: N Private report: N New Comment: Thanks for the report. I've modified your snippet to see the timings <?php while(!feof(STDIN)){ // usleep(1) <- adding this seems to fix this behaviour... // THIS WILL BLOCK FOR 100ms for every fgets call $t0 = microtime(1); $s = fgets(STDIN); $t1 = microtime(1); echo "fgets() took ", (($t1 - $t0)*1000), "ms\n"; fwrite(STDOUT, $s); } But i don't reproduce this. Call it like echo hello | php.exe -n bugs\69900.php on my machine, either PHP 5.5 or 7, the output is like fgets() took 0.015974044799805ms hello fgets() took 0.015974044799805ms Please provide a stable reproduce case for what you describe. Otherwise, the issue you experience is probably not fgets(). Thanks. Previous Comments: ------------------------------------------------------------------------ [2015-06-22 14:45:22] nerdbeere2k at gmail dot com Description: ------------ Explaining my whole setup for this would take some time so i'm gonna try to describe it as short as possible. I have a java application where i send some string to php-cli via standard input and read a result string back from standard output to do something else with it. I do this several times, so the php-cli process is getting several commands to work off, and i read the results back. The issue/bug now is that for every fgets call i make the process hangs for 100ms. This worked like a charm until version php-5.5.17 and broke in version php-5.5.18. php-5.6.* seems to have this issue as well. The changelog didn't exactly point towards a change that might've led to this as far as i could see. Especially weird is that it all works fine if i put a "usleep(1)" before the fgets call... I wrote some example breaking down the problem to as few lines as possible: <?php while(!feof(STDIN)){ // usleep(1) <- adding this seems to fix this behaviour... // THIS WILL BLOCK FOR 100ms for every fgets call $s = fgets(STDIN); fwrite(STDOUT, $s); } ?> This script is called from a java application like this (tested on jdk1.8.0_20): public static void main(String[] args) { try { Process p = Runtime.getRuntime().exec("./php-5.5.18/php.exe -f ./php-5.5.18/test.php"); InputStream inputStream = p.getInputStream(); OutputStream outputStream = p.getOutputStream(); byte[] buffer = new byte[1024]; while(p.isAlive()){ outputStream.write("TEST\r\n".getBytes()); outputStream.flush(); int read = inputStream.read(buffer); if(read > -1){ System.out.println(new String(buffer, 0, read)); } } } catch (IOException ex) { ex.printStackTrace(); } } ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=69900&edit=1