From: php at richardneill dot org
Operating system: Linux
PHP version: 5.2CVS-2009-06-25 (snap)
PHP Bug Type: Streams related
Bug description: stream_select returns 1 even when no streams have changed
Description:
------------
It seems that stream_select is failing to return 0 even if all of the
streams would block.
I've tested the code below on multiple versions of PHP from 5.2.4 upward,
and get the same result on them all.
(It's possible I've misunderstood the requirements for sockets, but I've
quintuple-checked this code.)
Reproduce code:
---------------
#!/usr/bin/php
<?
echo "This should never print 'did fread'.\n";
echo "It should just print 'stream_select returned 0' every second\n";
echo "\n";
$fp=fopen("/dev/null",r); #open /dev/null for reading.
#Should immediately result in EOF.
while (true) {
$r = array($fp);
$n = stream_select($r, $w = null, $e = null, 1);
#stream select on read array, timeout 1 sec
echo "stream_select returned $n\n";
if ($n) {
#Try to read up to 1024 bytes
echo fread($fp,1024);
echo "did fread.\n";
}
usleep (100000); //slow down (0.1s)
}
?>
Expected result:
----------------
I expect to see the line
stream_select returned 0
repeated every 1 second.
Actual result:
--------------
I get repeated instances of:
stream_select returned 1
did fread.
fread is returning nothing, but still the stream_select insists that there
is data available to be read!
--
Edit bug report at http://bugs.php.net/?id=48683&edit=1
--
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=48683&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=48683&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=48683&r=trysnapshot60
Fixed in CVS:
http://bugs.php.net/fix.php?id=48683&r=fixedcvs
Fixed in CVS and need be documented:
http://bugs.php.net/fix.php?id=48683&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=48683&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=48683&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=48683&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=48683&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=48683&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=48683&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=48683&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=48683&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=48683&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=48683&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=48683&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=48683&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=48683&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=48683&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=48683&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=48683&r=mysqlcfg
