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Fatal(3perl) Perl Programmers Reference Guide Fatal(3perl)
NAME
Fatal - Replace functions with equivalents which succeed or die
SYNOPSIS
use Fatal qw(open close);
open(my $fh, "<", $filename); # No need to check errors!
use File::Copy qw(move);
use Fatal qw(move);
move($file1, $file2); # No need to check errors!
sub juggle { . . . }
Fatal->import('juggle');
BEST PRACTICE
Fatal has been obsoleted by the new autodie pragma. Please use autodie in preference to
"Fatal". autodie supports lexical scoping, throws real exception objects, and provides
much nicer error messages.
The use of ":void" with Fatal is discouraged.
DESCRIPTION
"Fatal" provides a way to conveniently replace functions which normally return a false
value when they fail with equivalents which raise exceptions if they are not successful.
This lets you use these functions without having to test their return values explicitly on
each call. Exceptions can be caught using "eval{}". See perlfunc and perlvar for
details.
The do-or-die equivalents are set up simply by calling Fatal's "import" routine, passing
it the names of the functions to be replaced. You may wrap both user-defined functions
and overridable CORE operators (except "exec", "system", "print", or any other built-in
that cannot be expressed via prototypes) in this way.
If the symbol ":void" appears in the import list, then functions named later in that
import list raise an exception only when these are called in void context--that is, when
their return values are ignored. For example
use Fatal qw/:void open close/;
# properly checked, so no exception raised on error
if (not open(my $fh, '<', '/bogotic') {
warn "Can't open /bogotic: $!";
}
# not checked, so error raises an exception
close FH;
The use of ":void" is discouraged, as it can result in exceptions not being thrown if you
accidentally call a method without void context. Use autodie instead if you need to be
able to disable autodying/Fatal behaviour for a small block of code.
DIAGNOSTICS
Bad subroutine name for Fatal: %s
You've called "Fatal" with an argument that doesn't look like a subroutine name, nor a
switch that this version of Fatal understands.
%s is not a Perl subroutine
You've asked "Fatal" to try and replace a subroutine which does not exist, or has not
yet been defined.
%s is neither a builtin, nor a Perl subroutine
You've asked "Fatal" to replace a subroutine, but it's not a Perl built-in, and
"Fatal" couldn't find it as a regular subroutine. It either doesn't exist or has not
yet been defined.
Cannot make the non-overridable %s fatal
You've tried to use "Fatal" on a Perl built-in that can't be overridden, such as
"print" or "system", which means that "Fatal" can't help you, although some other
modules might. See the "SEE ALSO" section of this documentation.
Internal error: %s
You've found a bug in "Fatal". Please report it using the "perlbug" command.
BUGS
"Fatal" clobbers the context in which a function is called and always makes it a scalar
context, except when the ":void" tag is used. This problem does not exist in autodie.
"Used only once" warnings can be generated when "autodie" or "Fatal" is used with package
filehandles (eg, "FILE"). It's strongly recommended you use scalar filehandles instead.
AUTHOR
Original module by Lionel Cons (CERN).
Prototype updates by Ilya Zakharevich <ilya AT math.edu>.
autodie support, bugfixes, extended diagnostics, "system" support, and major overhauling
by Paul Fenwick <pjf AT perltraining.au>
LICENSE
This module is free software, you may distribute it under the same terms as Perl itself.
SEE ALSO
autodie for a nicer way to use lexical Fatal.
IPC::System::Simple for a similar idea for calls to "system()" and backticks.
perl v5.34.0 2023-11-23 Fatal(3perl)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
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