Edit report at https://bugs.php.net/bug.php?id=63411&edit=1
ID: 63411
Updated by: php-bugs@lists.php.net
Reported by: marcel at silverstreet dot com
Summary: curl_multi_select() returns invalid value
-Status: Feedback
+Status: No Feedback
Type: Bug
Package: cURL related
Operating System: CentOS 6.3
PHP Version: 5.3.18
Assigned To: pierrick
New Comment:
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Open". Thank you.
Previous Comments:
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[2012-12-31 23:04:18] mail+php at requinix dot net
Related To: Bug #63842
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[2012-11-15 13:54:10] pierrick@php.net
As mentioned in bug #61141, curl_multi_select() returning -1 is an expected behaviour and you should
not throw an exception which prevent your call to
be done.
Internally php curl_multi_select uses libcurl curl_multi_fdset function to set all the fd_set and
the maxfd value. The libcurl curl_multi_fdset
documentation says :
When libcurl returns -1 in max_fd, it is because libcurl currently does something that isn't
possible for your application to monitor with a socket and
unfortunately you can then not know exactly when the current action is completed using select().
When max_fd returns with -1, you need to wait a while
and then proceed and call curl_multi_perform anyway. How long to wait? I would suggest 100
milliseconds at least, but you may want to test it out in
our own particular conditions to find a suitable value.
The workaround you made is not really a workaround, but is exactly what libcurl recommend you to do
in this case :)
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[2012-11-15 11:42:21] bfanger at gmail dot com
curl_multi_select() returning -1 has been an issue for windows versions of PHP
for a while:
https://bugs.php.net/bug.php?id=61141
A workaround for my Curl wrapper class was to rewrite:
if (curl_multi_select(self::$pool, 0.2) === -1) {
throw new \Exception('Failed to detect changes in the cURL multi handle');
}
To:
if (curl_multi_select(self::$pool, 0.2) === -1) {
usleep(100000); // wait 0.1 second
}
PS:
When are you going to introduce the new curl_multi_wait function to php?
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[2012-11-15 09:30:31] bfanger at gmail dot com
It breaks all my testcases in PHP 5.4.8 (works fine in 5.4.7)
$ git clone git://github.com/sledgehammer/core.git testapp/core
$ phpunit --bootstrap testapp/core/phpunit_bootstrap.php
testapp/core/tests/CurlTest.php
------------------------------------------------------------------------
[2012-11-15 05:39:33] pierrick@php.net
Does it break all the test cases ? Or only like in your case when you have no
handle ?
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