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Devel::SimpleTrace(3) User Contributed Perl DocumentationDevel::SimpleTrace(3)

NAME
       Devel::SimpleTrace - See	where you code warns and dies using stack
       traces

VERSION
       Version 0.08

SYNOPSIS
       On the command-line:

	   perl	-wMDevel::SimpleTrace program_with_strange_errors.pl

       Inside a	module:

	   use Devel::SimpleTrace;

DESCRIPTION
       This module can be used to more easily spot the place where a program
       or a module generates errors. Its use is	extremely simple, reduced to
       just "use"ing it.

       This is achieved	by modifying the functions "warn()" and	"die()"	in
       order to	replace	the standard messages by complete stack	traces that
       precisely indicates how and where the error or warning occurred.	 Other
       than this, their	use should stay	unchanged, even	when using "die()"
       inside "eval()".

OPTIONS
       Options can be set at import time using:

	   perl	-wMDevel::SimpleTrace=option1,option2

       or

	   use Devel::SimpleTrace qw(option1 option2);

       Available options are:

       "showrefs"
	   Using this option will tell "Devel::SimpleTrace" to stringify
	   objects and references passed in argument to	"die()". This option
	   is disabled by default in order to leave objects and	references
	   untouched.

EXAMPLE
       For example, "HTTP::Proxy" 0.14 suffered	from strange warnings, and its
       author Philippe Bruhat had a hard time trying to	understand where they
       could come from.

	   getsockname() on closed socket Symbol::GEN7 at /System/Library/Perl/darwin/IO/Socket.pm line	186.
	   Use of uninitialized	value in numeric ne (!=) at /Library/Perl/HTTP/Daemon.pm line 53.

       Hmm.. There's obviously something wrong here, but spotting the right
       line is not easy.

       Re-running the same script, unchanged, by just adding
       "-MDevel::SimpleTrace" to "perl"	arguments produces the following
       output:

	   getsockname() on closed socket Symbol::GEN7
		   at IO::Socket::sockname(/System/Library/Perl/darwin/IO/Socket.pm:186)
		   at IO::Socket::INET::sockport(/System/Library/Perl/IO/Socket/INET.pm:231)
		   at HTTP::Daemon::url(/Library/Perl/HTTP/Daemon.pm:52)
		   at HTTP::Daemon::ClientConn::get_request(/Library/Perl/HTTP/Daemon.pm:139)
		   at HTTP::Proxy::serve_connections(/Library/Perl/HTTP/Proxy.pm:500)
		   at HTTP::Proxy::start(/Library/Perl/HTTP/Proxy.pm:392)
		   at t::Utils::fork_proxy(t/Utils.pm:72)
		   at main::(t/50standard.t:138)
	   Use of uninitialized	value in numeric ne (!=)
		   at HTTP::Daemon::url(/Library/Perl/HTTP/Daemon.pm:53)
		   at HTTP::Daemon::ClientConn::get_request(/Library/Perl/HTTP/Daemon.pm:139)
		   at HTTP::Proxy::serve_connections(/Library/Perl/HTTP/Proxy.pm:500)
		   at HTTP::Proxy::start(/Library/Perl/HTTP/Proxy.pm:392)
		   at t::Utils::fork_proxy(t/Utils.pm:72)
		   at main::(t/50standard.t:138)

       Aha! Much better. Finding the bug is now	a trivial task ";-)"

DIAGNOSTICS
       Unknown option: %s
	   (W) This warning occurs if you try to set an	unknown	option.

CAVEATS
       This module is currently	not compatible with other modules that also
       work by overriding "die()" and "warn()",	like "CGI::Carp".

AUTHOR
       SA(C)bastien Aperghis-Tramoni <sebastien@aperghis.net>

BUGS
       Please report any bugs or feature requests to
       "bug-Devel-SimpleTrace@rt.cpan.org", or through the web interface at
       <https://rt.cpan.org/Public/Dist/Display.html?Name=Devel-SimpleTrace>.
       I will be notified, and then you'll automatically be notified of
       progress	on your	bug as I make changes.

COPYRIGHT & LICENSE
       Devel::SimpleTrace is Copyright (C)2004-2011 SA(C)bastien Aperghis-
       Tramoni.

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

perl v5.32.0			  2011-02-19		 Devel::SimpleTrace(3)

NAME | VERSION | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLE | DIAGNOSTICS | CAVEATS | AUTHOR | BUGS | COPYRIGHT & LICENSE

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