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.\" ========================================================================
.\"
.IX Title "Test::Trap::Builder::SystemSafe 3pm"
.TH Test::Trap::Builder::SystemSafe 3pm "2012-03-02" "perl v5.14.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Test::Trap::Builder::SystemSafe \- "Safe" output layer backend using File::Temp
.SH "VERSION"
.IX Header "VERSION"
Version 0.2.2
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module provides an implementation \fIsystemsafe\fR, based on
File::Temp, for the trap's output layers.  This implementation insists
on reopening the output file handles with the same descriptors, and
therefore, unlike Test::Trap::Builder::TempFile and
Test::Trap::Builder::PerlIO, is able to trap output from forked-off
processes, including \fIsystem()\fR.
.PP
See also Test::Trap (:stdout and :stderr) and
Test::Trap::Builder (output_layer).
.SH "CAVEATS"
.IX Header "CAVEATS"
Using File::Temp, we need privileges to create tempfiles.
.PP
We need disk space for the output of every trap (it should clean up
after the trap is sprung).
.PP
Disk access may be slow \*(-- certainly compared to the in-memory files
of PerlIO.
.PP
If the file handle we try to trap using this backend is on an
in-memory file, it would not be availible to other processes in any
case.  Rather than change the semantics of the trapped code or
silently fail to trap output from forked-off processes, we just raise
an exception in this case.
.PP
If there is another file handle with the same descriptor (f ex after
an \f(CW\*(C`open OTHER, \*(Aq>&=\*(Aq, THIS\*(C'\fR), we can't get that file descriptor.
Rather than silently fail, we again raise an exception.
.PP
Threads?  No idea.  It might even work correctly.
.SH "BUGS"
.IX Header "BUGS"
Please report any bugs or feature requests directly to the author.
.SH "AUTHOR"
.IX Header "AUTHOR"
Eirik Berg Hanssen, \f(CW\*(C`<ebhanssen@allverden.no>\*(C'\fR
.SH "COPYRIGHT & LICENSE"
.IX Header "COPYRIGHT & LICENSE"
Copyright 2006\-2012 Eirik Berg Hanssen, All Rights Reserved.
.PP
This program is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.