ID: 27518
Updated by: [EMAIL PROTECTED]
Reported By: pavcio at 4lo dot bytom dot pl
-Status: Open
+Status: Bogus
Bug Type: Filesystem function related
Operating System: GNU/Linux 2.6.3
PHP Version: 5CVS-2004-03-07 (dev)
New Comment:
You are filling up the pipes and never consuming the data from its
output.
Not a bug in php at all, but your script.
Use a smaller size chunk when writing to the pipe, and
read the data from your output pipe.
Also, *PLEASE* fill in the bug report correctly; if you'd
filled in the expected output in the first instance I could
have diagnosed your broken code just by reading it.
Previous Comments:
------------------------------------------------------------------------
[2004-03-07 12:19:18] pavcio at 4lo dot bytom dot pl
Description:
------------
I`ve noticed that fwrite() function hangs when it copies data from a
file to a pipe and fseek() has been called before it. See the code for
details.
My system:
- GNU/Linux Slackware-current on 2.6.3 kernel
- GCC 3.3.2
- glibc 2.3.2
- PHP versions tested: 5.0b4 and php5-200403071430
Reproduce code:
---------------
#!/usr/local/bin/php
<?php
$mfp = fopen(tempnam('/tmp', 'test'), 'w+');
for($i=0; $i < 1024; $i++) $kilobyte .= "A";
for($i=0; $i < 100; $i++) fwrite($mfp, $kilobyte);
$process = proc_open('/bin/cat', array(0 => array('pipe', 'r'), 1 =>
array('pipe', 'w'), 2 => array('pipe', 'w')), $pipes);
fseek($mfp, 0);
while( TRUE ) {
$data = fread($mfp, 65536);
if( strlen($data) == 0 ) break;
fwrite($pipes[0], $data);
}
proc_close($process);
?>
Expected result:
----------------
Try to guess ;-).
Actual result:
--------------
Here is the end of strace dump:
(...cut...)
pipe([7, 8]) = 0
pipe([9, 10]) = 0
pipe([11, 12]) = 0
fork() = 16951
close(7) = 0
(,,,cut...)
lseek(3, 0, SEEK_SET) = 0
(...cut...)
write(8, "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"..., 8192) = 8192
write(8, "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"..., 8192) = 8192
write(8, "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"..., 8192) = 8192
write(8, "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"..., 8192 <unfinished ...>
(here PHP hangs)
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=27518&edit=1
