Bug #72864 [NEW]: CURLOPT_READFUNCTION waits $fp readable only once.

From: ryosuke_i_628 at yahoo dot co dot jp Operating system: OSX 10.11.5 PHP version: 7.0.9 Package: cURL related Bug Type: Bug Bug description:CURLOPT_READFUNCTION waits $fp readable only once. Description: ------------ CURLOPT_READFUNCTION waits $fp readable only once. Is this a bug? Or by design? Test script: --------------- <?php /* mkfifo /path/to/fifo */ $fp = fopen('/path/to/fifo', 'rb'); $ch = curl_init(); curl_setopt_array($ch, [ CURLOPT_URL => 'example.com', CURLOPT_PUT => true, CURLOPT_INFILE => $fp, CURLOPT_INFILESIZE => 5, CURLOPT_READFUNCTION => function ($ch, $fp, $max) { $buf = fread($fp, 1); var_dump($buf); return $buf; }, ]); curl_exec($ch); /* We can verify that CURLOPT_READFUNCTION invocation is blocked. However, after we executed the following command... printf "a" > /path/to/fifo */ ?> Expected result: ---------------- string(1) "a" ...then invocation should be blocked again Actual result: -------------- string(1) "a" string(0) "" ...wtf!? -- Edit bug report at https://bugs.php.net/bug.php?id=72864&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=72864&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=72864&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=72864&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=72864&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=72864&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=72864&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=72864&r=needscript Try newer version: https://bugs.php.net/fix.php?id=72864&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=72864&r=support Expected behavior: https://bugs.php.net/fix.php?id=72864&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=72864&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=72864&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=72864&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=72864&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=72864&r=dst IIS Stability: https://bugs.php.net/fix.php?id=72864&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=72864&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=72864&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=72864&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=72864&r=mysqlcfg