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.\" ========================================================================
.\"
.IX Title "Test2::Require::Fork 3pm"
.TH Test2::Require::Fork 3pm "2019-01-20" "perl v5.28.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
Test2::Require::Fork \- Skip a test file unless the system supports forking
.SH "DESCRIPTION"
.IX Header "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.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use Test2::Require::Fork;
\&
\&    ... Code that forks ...
.Ve
.SH "EXPLANATION"
.IX Header "EXPLANATION"
Checking if the current system supports forking is not simple. Here is an
example of how to do it:
.PP
.Vb 1
\&    use Config;
\&
\&    sub CAN_FORK {
\&        return 1 if $Config{d_fork};
\&
\&        # Some platforms use ithreads to mimic forking
\&        return 0 unless $^O eq \*(AqMSWin32\*(Aq || $^O eq \*(AqNetWare\*(Aq;
\&        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{\*(AqDevel/Cover.pm\*(Aq};
\&        return 1;
\&    }
.Ve
.PP
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.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
.IP "Test2::Require::CanReallyfork" 4
.IX Item "Test2::Require::CanReallyfork"
Similar to this module, but will skip on any perl that only has fork emulation.
.IP "Test2::Require::CanThread" 4
.IX Item "Test2::Require::CanThread"
Skip the test file if the system does not support threads.
.SH "SOURCE"
.IX Header "SOURCE"
The source code repository for Test2\-Suite can be found at
\&\fIhttps://github.com/Test\-More/Test2\-Suite/\fR.
.SH "MAINTAINERS"
.IX Header "MAINTAINERS"
.IP "Chad Granum <exodist@cpan.org>" 4
.IX Item "Chad Granum <exodist@cpan.org>"
.SH "AUTHORS"
.IX Header "AUTHORS"
.PD 0
.IP "Chad Granum <exodist@cpan.org>" 4
.IX Item "Chad Granum <exodist@cpan.org>"
.PD
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2018 Chad Granum <exodist@cpan.org>.
.PP
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
.PP
See \fIhttp://dev.perl.org/licenses/\fR