/usr/share/perl5/Proc/WaitStat.pm is in libproc-waitstat-perl 1.00-5.
This file is owned by root:root, with mode 0o644.
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#
# Copyright (c) 1997 Roderick Schertler. All rights reserved. This
# program is free software; you can redistribute it and/or modify it
# under the same terms as Perl itself.
=head1 NAME
Proc::WaitStat - Interpret and act on wait() status values
=head1 SYNOPSIS
$description = waitstat $?;
exit waitstat_reuse $?;
waitstat_die $?, 'program-name';
close_die COMMAND, 'program-name';
=head1 DESCRIPTION
This module contains functions for interpreting and acting on wait
status values.
Nothing is exported by default.
=over
=cut
package Proc::WaitStat;
use 5.003_98; # piped close errno resetting
use strict;
use vars qw($VERSION @ISA @EXPORT_OK);
use Carp qw(croak);
use Exporter ();
use IPC::Signal qw(sig_name);
use POSIX qw(:sys_wait_h);
$VERSION = '1.00';
@ISA = qw(Exporter);
@EXPORT_OK = qw(waitstat waitstat_reuse waitstat_die close_die);
=item B<waitstat> I<wait-status>
Returns a string representation of wait() status value I<wait-status>.
Values returned are like C<"0"> and C<"64"> and C<"killed (SIGHUP)">.
This function is prototyped to take a single scalar argument.
=cut
sub waitstat ($) {
my $status = shift;
if (WIFEXITED $status) {
WEXITSTATUS $status
}
elsif (WIFSIGNALED $status) {
# XXX WCOREDUMP
'killed (SIG' . sig_name(WTERMSIG $status) . ')'
}
elsif (WIFSTOPPED $status) {
'stopped (SIG' . sig_name(WSTOPSIG $status) . ')'
}
# XXX WIFCONTINUED
else {
"invalid wait status $status"
}
}
=item B<waitstat_reuse> I<wait-status>
Turn I<wait-status> into a value which can be passed to B<exit>, converted
in the same manner the shell uses. If I<wait-status> indicates a normal
exit, return the exit value. If I<wait-status> instead indicates death by
signal, return 128 plus the signal number.
This function is prototyped to take a single scalar argument.
=cut
sub waitstat_reuse ($) {
my $status = shift;
if (WIFEXITED $status) {
WEXITSTATUS $status
}
elsif (WIFSIGNALED $status) {
128 + WTERMSIG $status
}
elsif (WIFSTOPPED $status) {
128 + WSTOPSIG $status
}
else {
croak "Invalid wait status $status";
}
}
=item B<waitstat_die> I<wait-status> I<program-name>
die() if I<wait-status> is non-zero (mentioning I<program-name> as the
source of the error).
This function is prototyped to take two scalar arguments.
=cut
sub waitstat_die ($$) {
my ($status, $program) = @_;
croak "Non-zero exit (" . waitstat($status) .
") from $program"
if $status;
}
=item B<close_die> I<filehandle> I<name>
Close I<filehandle>, if that fails die() with an appropriate message
which refers to I<name>. This handles failed closings of both programs
and files properly.
This function is prototyped to take a filehandle (actually, a glob ref)
and a scalar.
=cut
sub close_die (*$) {
my ($fh, $name) = @_;
unless (ref $fh || ref \$fh eq 'GLOB') {
require Symbol;
$fh = Symbol::qualify_to_ref($fh, caller);
}
unless (close $fh) {
croak "Error closing $name: ",
$!+0 ? "$!" : 'non-zero exit (' . waitstat($?) . ')';
}
}
1
__END__
=back
=head1 EXAMPLES
close SENDMAIL;
exit if $? == 0;
log "sendmail failure: ", waitstat $?;
exit EX_TEMPFAIL;
$pid == waitpid $pid, 0 or croak "Failed to reap $pid: $!";
exit waitstat_reuse $?;
$output = `some-program -with args`;
waitstat_die $?, 'some-program';
print "Output from some-process:\n", $output;
open PROGRAM, '| post-processor' or die "Can't fork: $!";
while (<IN>) {
print PROGRAM pre_process $_
or die "Error writing to post-processor: $!";
}
# This handles both flush failures at close time and a non-zero exit
# from the subprocess.
close_die PROGRAM, 'post-processor';
=head1 AUTHOR
Roderick Schertler <F<roderick@argon.org>>
=head1 SEE ALSO
perl(1), IPC::Signal(3pm).
=cut
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