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Doc Bug #78611 listen.backlog is not -1, and -1 does not mean 'unlimited'.
Submitted: 2019-09-30 05:34 UTC Modified: 2021-03-18 23:53 UTC
From: psi at 7io dot org Assigned:
Status: Verified Package: FPM related
PHP Version: Irrelevant OS: Linux
Private report: No CVE-ID: None
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 [2019-09-30 05:34 UTC] psi at 7io dot org 
Description:
------------
As described in this code:

https://github.com/php/php-src/blob/1ad08256f349fa513157437abc4feb245cce03fc/sapi/fpm/fpm/fpm_sockets.h#L17

the default value of "listen.backlog" in php-fpm.conf is not -1. It is 511.

In BSD, the default value is -1, but it does not mean "unlimited".

Please see here(freebsd):
https://www.freebsd.org/cgi/man.cgi?listen(2)#end

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 [2019-09-30 08:45 UTC] requinix@php.net
-Status: Open +Status: Verified
 [2019-09-30 08:45 UTC] requinix@php.net 
https://www.php.net/manual/en/install.fpm.configuration.php
> listen.backlog int
> Set listen(2) backlog. A value of '-1' means unlimited. Default value: -1.


> In BSD, the default value is -1, but it does not mean "unlimited".
Source? Neither the FreeBSD, NetBSD, nor OpenBSD manpages talk about a backlog <= 0. Meanwhile die.net's POSIX docs say such a backlog "may be set to an implementation-defined minimum value".
Unless you're talking about the literal meaning of not having any limit whatsoever? Which obviously could not be the case.
 [2019-10-02 16:40 UTC] henry dot paradiz at gmail dot com 
Hello my name henry. The value -1 does not mean unlimited in BSD but it can continuously go on for a long long time which is why it is important to keep the documentation the way it is. If we changed everything over some minor details we would have successfully deleted the documentation. What I recommend is changing BSD to accept it as "unlimited". One and done.
 [2021-03-18 23:53 UTC] cmb@php.net
-Type: Bug +Type: Documentation Problem -Package: Documentation problem +Package: FPM related
 
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