Edit report at https://bugs.php.net/bug.php?id=64654&edit=1
ID: 64654
Comment by: xilon dot jul at gmail dot com
Reported by: xilon dot jul at gmail dot com
Summary: socket_select returns false and socket_last_error
returns 0 (success)
Status: Open
Type: Bug
Package: Sockets related
Operating System: Linux 3.5.0-23-generic
PHP Version: 5.4.14
Block user comment: N
Private report: N
New Comment:
Thanx laruence for your answer. I also "straced" the sample to check if the
real
sys call was invoked and indeed it is not. Php does some processing before
giving the hand to the select sys call (checking valid fd, raising a warning as
you mentionned).
However to give more control on Php side, I think a return code different from
0
must be returned. Even if it's not a "bug", my opinion is that there is a
misconception here about raising a warning and having a success return code and
that thinking that all that should be fined enough for PHP developpers.
Previous Comments:
------------------------------------------------------------------------
[2013-04-17 13:59:47] larue...@php.net
I don't think this is a bug.
the warning is threw before do really "select", it is an error in php side. not
system call side.
and socket_last_error is for the error in system call side.
------------------------------------------------------------------------
[2013-04-17 09:52:28] xilon dot jul at gmail dot com
Description:
------------
When a socket ressource previously watched for read I/O in socket_select is
closed, the socket_select function would return false and throw a warning
saying
"Not a valid socket ressource".
The fact is that subsequent call to socket_last_error() returns 0 which
translates
to success using socket_strerror().
Test script:
---------------
$socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
if (false === socket_bind($socket, '0.0.0.0', 5555)) {
die('bind()');
}
$read[] = $socket;
// voluntarily close the socket
socket_close($socket);
// Will throw a warning and return false
$retval = socket_select($read, $w = null, $e = null, 1);
echo socket_last_error(); // returns 0
Expected result:
----------------
As the C select system call, closing the socket should return a valid system
error
code.
The C counterpart of this PHP sample above gives :
select(): Bad file descriptor (9 => EBADF)
Actual result:
--------------
The result of socket_last_error is 0.
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=64654&edit=1
