Bug #69963 [NEW]: fgets reads EOF if there is nothing on the PIPE to read for a short period

From: poonam dot chawla at mathworks dot com Operating system: Windows PHP version: 5.6.10 Package: Streams related Bug Type: Bug Bug description:fgets reads EOF if there is nothing on the PIPE to read for a short period Description: ------------ I am using PHP to read from STDIN and write to a log file. The PHP process is spawned by another process (for the example sake, I am attaching a python script that spawns a new PHP process). I observed that if there is nothing to read on the STDIN for a short period of time, PHP behaves unexpectedly (reads EOF and exits).It was interesting to find out that PHP 5.4 exhibhits the correct behavior, however both PHP 5.5 and 5.6 behave unexpectedly. Test script: --------------- PHP: <?php $in = fopen("php://stdin", "rb"); $out = fopen('C:/Users/pchawla/php_test/log_file.txt', 'w'); while ( ! feof($in) ) { $line = fgets($in); fwrite($out, $line); } ?> import subprocess import sys Python: import subprocess import sys def log(): proc = subprocess.Popen(['php', 'C:/Users/pchawla/php_test/log_handler.php'], stdin=subprocess.PIPE) while True: line = sys.stdin.readline(); proc.stdin.write(line) if __name__ == "__main__": log() Expected result: ---------------- fgets() should return FALSE only when there is an error or it reads EOF from the PIPE. Actual result: -------------- fgets() returns FALSE when there is nothing to read from the PIPE for a short period of time (~20 seconds). -- Edit bug report at https://bugs.php.net/bug.php?id=69963&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=69963&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=69963&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=69963&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=69963&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=69963&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=69963&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=69963&r=needscript Try newer version: https://bugs.php.net/fix.php?id=69963&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=69963&r=support Expected behavior: https://bugs.php.net/fix.php?id=69963&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=69963&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=69963&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=69963&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=69963&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=69963&r=dst IIS Stability: https://bugs.php.net/fix.php?id=69963&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=69963&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=69963&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=69963&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=69963&r=mysqlcfg