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Special Forums Cybersecurity rlogin or remote access via internet Post 19466 by JeZzTeR on Thursday 11th of April 2002 02:24:27 PM
Old 04-11-2002
PxT took the words outta my mouth
 

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Carp(3pm)						 Perl Programmers Reference Guide						 Carp(3pm)

NAME
carp - warn of errors (from perspective of caller) cluck - warn of errors with stack backtrace (not exported by default) croak - die of errors (from perspective of caller) confess - die of errors with stack backtrace shortmess - return the message that carp and croak produce longmess - return the message that cluck and confess produce SYNOPSIS
use Carp; croak "We're outta here!"; use Carp qw(cluck); cluck "This is how we got here!"; print FH Carp::shortmess("This will have caller's details added"); print FH Carp::longmess("This will have stack backtrace added"); DESCRIPTION
The Carp routines are useful in your own modules because they act like die() or warn(), but with a message which is more likely to be use- ful to a user of your module. In the case of cluck, confess, and longmess that context is a summary of every call in the call-stack. For a shorter message you can use carp, croak or shortmess which report the error as being from where your module was called. There is no guarantee that that is where the error was, but it is a good educated guess. Here is a more complete description of how shortmess works. What it does is search the call-stack for a function call stack where it hasn't been told that there shouldn't be an error. If every call is marked safe, it then gives up and gives a full stack backtrace instead. In other words it presumes that the first likely looking potential suspect is guilty. Its rules for telling whether a call shouldn't generate errors work as follows: 1. Any call from a package to itself is safe. 2. Packages claim that there won't be errors on calls to or from packages explicitly marked as safe by inclusion in @CARP_NOT, or (if that array is empty) @ISA. The ability to override what @ISA says is new in 5.8. 3. The trust in item 2 is transitive. If A trusts B, and B trusts C, then A trusts C. So if you do not override @ISA with @CARP_NOT, then this trust relationship is identical to, "inherits from". 4. Any call from an internal Perl module is safe. (Nothing keeps user modules from marking themselves as internal to Perl, but this prac- tice is discouraged.) 5. Any call to Carp is safe. (This rule is what keeps it from reporting the error where you call carp/croak/shortmess.) Forcing a Stack Trace As a debugging aid, you can force Carp to treat a croak as a confess and a carp as a cluck across all modules. In other words, force a detailed stack trace to be given. This can be very helpful when trying to understand why, or from where, a warning or error is being gen- erated. This feature is enabled by 'importing' the non-existent symbol 'verbose'. You would typically enable it by saying perl -MCarp=verbose script.pl or by including the string "MCarp=verbose" in the PERL5OPT environment variable. BUGS
The Carp routines don't handle exception objects currently. If called with a first argument that is a reference, they simply call die() or warn(), as appropriate. perl v5.8.0 2002-06-01 Carp(3pm)

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