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# $Id: WaitStat.pm,v 1.3 1999-10-21 12:39:43-04 roderick Exp $ |
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# Copyright (c) 1997 Roderick Schertler. All rights reserved. This |
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# program is free software; you can redistribute it and/or modify it |
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# under the same terms as Perl itself. |
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=head1 NAME |
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Proc::WaitStat - Interpret and act on wait() status values |
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=head1 SYNOPSIS |
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$description = waitstat $?; |
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exit waitstat_reuse $?; |
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waitstat_die $?, 'program-name'; |
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close_die COMMAND, 'program-name'; |
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=head1 DESCRIPTION |
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This module contains functions for interpreting and acting on wait |
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status values. |
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Nothing is exported by default. |
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=over |
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=cut |
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package Proc::WaitStat; |
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use 5.003_98; # piped close errno resetting |
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use strict; |
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use vars qw($VERSION @ISA @EXPORT_OK); |
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use Carp qw(croak); |
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use Exporter (); |
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use IPC::Signal qw(sig_name); |
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use POSIX qw(:sys_wait_h); |
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$VERSION = '1.00'; |
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@ISA = qw(Exporter); |
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@EXPORT_OK = qw(waitstat waitstat_reuse waitstat_die close_die); |
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=item B I |
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Returns a string representation of wait() status value I. |
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Values returned are like C<"0"> and C<"64"> and C<"killed (SIGHUP)">. |
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This function is prototyped to take a single scalar argument. |
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=cut |
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sub waitstat ($) { |
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my $status = shift; |
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if (WIFEXITED $status) { |
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WEXITSTATUS $status |
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} |
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elsif (WIFSIGNALED $status) { |
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# XXX WCOREDUMP |
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'killed (SIG' . sig_name(WTERMSIG $status) . ')' |
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} |
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elsif (WIFSTOPPED $status) { |
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'stopped (SIG' . sig_name(WSTOPSIG $status) . ')' |
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} |
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# XXX WIFCONTINUED |
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else { |
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"invalid wait status $status" |
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} |
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} |
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=item B I |
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Turn I into a value which can be passed to B, converted |
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in the same manner the shell uses. If I indicates a normal |
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exit, return the exit value. If I instead indicates death by |
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signal, return 128 plus the signal number. |
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This function is prototyped to take a single scalar argument. |
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=cut |
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sub waitstat_reuse ($) { |
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my $status = shift; |
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if (WIFEXITED $status) { |
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WEXITSTATUS $status |
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} |
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elsif (WIFSIGNALED $status) { |
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128 + WTERMSIG $status |
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} |
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elsif (WIFSTOPPED $status) { |
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128 + WSTOPSIG $status |
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} |
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else { |
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croak "Invalid wait status $status"; |
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} |
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} |
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=item B I I |
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die() if I is non-zero (mentioning I as the |
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source of the error). |
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This function is prototyped to take two scalar arguments. |
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=cut |
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sub waitstat_die ($$) { |
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my ($status, $program) = @_; |
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croak "Non-zero exit (" . waitstat($status) . |
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") from $program" |
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if $status; |
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} |
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=item B I I |
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Close I, if that fails die() with an appropriate message |
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which refers to I. This handles failed closings of both programs |
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and files properly. |
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This function is prototyped to take a filehandle (actually, a glob ref) |
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and a scalar. |
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=cut |
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sub close_die (*$) { |
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my ($fh, $name) = @_; |
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unless (ref $fh || ref \$fh eq 'GLOB') { |
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require Symbol; |
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$fh = Symbol::qualify_to_ref($fh, caller); |
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} |
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unless (close $fh) { |
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croak "Error closing $name: ", |
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$!+0 ? "$!" : 'non-zero exit (' . waitstat($?) . ')'; |
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} |
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} |
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__END__ |