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https://github.com/paparazzi/paparazzi.git
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Bernard Davison
e45fb91b64
Then there's the cleanup to do to make this all much easier to do in the future to more boards...
139 lines
3.2 KiB
Perl
139 lines
3.2 KiB
Perl
# Proc::Background::Unix: Unix interface to background process management.
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#
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# Copyright (C) 1998-2005 Blair Zajac. All rights reserved.
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package Proc::Background::Unix;
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require 5.004_04;
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use strict;
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use Exporter;
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use Carp;
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use POSIX qw(:errno_h :sys_wait_h);
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use vars qw(@ISA $VERSION);
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@ISA = qw(Exporter);
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$VERSION = sprintf '%d.%02d', '$Revision: 1.10 $' =~ /(\d+)\.(\d+)/;
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# Start the background process. If it is started sucessfully, then record
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# the process id in $self->{_os_obj}.
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sub _new {
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my $class = shift;
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unless (@_ > 0) {
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confess "Proc::Background::Unix::_new called with insufficient number of arguments";
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}
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return unless defined $_[0];
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# If there is only one element in the @_ array, then it may be a
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# command to be passed to the shell and should not be checked, in
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# case the command sets environmental variables in the beginning,
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# i.e. 'VAR=arg ls -l'. If there is more than one element in the
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# array, then check that the first element is a valid executable
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# that can be found through the PATH and find the absolute path to
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# the executable. If the executable is found, then replace the
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# first element it with the absolute path.
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my @args = @_;
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if (@_ > 1) {
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$args[0] = Proc::Background::_resolve_path($args[0]) or return;
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}
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my $self = bless {}, $class;
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# Fork a child process.
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my $pid;
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{
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if ($pid = fork()) {
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# parent
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$self->{_os_obj} = $pid;
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$self->{_pid} = $pid;
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last;
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} elsif (defined $pid) {
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# child
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exec @_ or croak "$0: exec failed: $!\n";
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} elsif ($! == EAGAIN) {
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sleep 5;
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redo;
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} else {
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return;
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}
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}
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$self;
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}
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# Wait for the child.
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sub _waitpid {
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my $self = shift;
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my $timeout = shift;
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{
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# Try to wait on the process.
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my $result = waitpid($self->{_os_obj}, $timeout ? 0 : WNOHANG);
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# Process finished. Grab the exit value.
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if ($result == $self->{_os_obj}) {
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return (0, $?);
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}
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# Process already reaped. We don't know the exist status.
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elsif ($result == -1 and $! == ECHILD) {
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return (1, 0);
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}
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# Process still running.
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elsif ($result == 0) {
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return (2, 0);
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}
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# If we reach here, then waitpid caught a signal, so let's retry it.
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redo;
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}
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return 0;
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}
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sub _die {
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my $self = shift;
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# Try to kill the process with different signals. Calling alive() will
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# collect the exit status of the program.
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SIGNAL: {
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foreach my $signal (qw(HUP QUIT INT KILL)) {
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my $count = 5;
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while ($count and $self->alive) {
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--$count;
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kill($signal, $self->{_os_obj});
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last SIGNAL unless $self->alive;
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sleep 1;
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}
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}
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}
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}
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1;
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__END__
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=head1 NAME
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Proc::Background::Unix - Unix interface to process mangement
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=head1 SYNOPSIS
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Do not use this module directly.
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=head1 DESCRIPTION
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This is a process management class designed specifically for Unix
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operating systems. It is not meant used except through the
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I<Proc::Background> class. See L<Proc::Background> for more information.
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=head1 AUTHOR
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Blair Zajac <blair@orcaware.com>
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=head1 COPYRIGHT
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Copyright (C) 1998-2005 Blair Zajac. All rights reserved. This
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package 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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=cut
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