Test2::Require::Fork(3)                    User Contributed Perl Documentation


NAME
       Test2::Require::Fork - Skip a test file unless the system supports
       forking

DESCRIPTION
       It is fairly common to write tests that need to fork. Not all systems
       support forking. This library does the hard work of checking if forking
       is supported on the current system. If forking is not supported then
       this will skip all tests and exit true.

SYNOPSIS
           use Test2::Require::Fork;

           ... Code that forks ...

EXPLANATION
       Checking if the current system supports forking is not simple. Here is
       an example of how to do it:

           use Config;

           sub CAN_FORK {
               return 1 if $Config{d_fork};

               # Some platforms use ithreads to mimic forking
               return 0 unless $^O eq 'MSWin32' || $^O eq 'NetWare';
               return 0 unless $Config{useithreads};
               return 0 unless $Config{ccflags} =~ /-DPERL_IMPLICIT_SYS/;

               # Threads are not reliable before 5.008001
               return 0 unless $] >= 5.008001;

               # Devel::Cover currently breaks with threads
               return 0 if $INC{'Devel/Cover.pm'};
               return 1;
           }

       Duplicating this non-trivial code in all tests that need to fork is
       error-prone. It is easy to forget bits, or get it wrong. On top of
       these checks, you also need to tell the harness that no tests should
       run and why.

SEE ALSO
       Test2::Require::CanReallyfork
           Similar to this module, but will skip on any perl that only has
           fork emulation.

       Test2::Require::CanThread
           Skip the test file if the system does not support threads.

SOURCE
       The source code repository for Test2-Suite can be found at
       https://github.com/Test-More/Test2-Suite/.

MAINTAINERS
       Chad Granum <exodist@cpan.org>

AUTHORS
       Chad Granum <exodist@cpan.org>

COPYRIGHT
       Copyright 2018 Chad Granum <exodist@cpan.org>.

       This program is free software; you can redistribute it and/or modify it
       under the same terms as Perl itself.

       See http://dev.perl.org/licenses/

perl v5.38.2                      2024-05-12           Test2::Require::Fork(3)