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87 lines
2.4 KiB
87 lines
2.4 KiB
#!/usr/bin/env perl
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require 5.003;
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use warnings;
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$indent=4;
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#
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# Copyright by The HDF Group.
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# All rights reserved.
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#
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# This file is part of HDF5. The full HDF5 copyright notice, including
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# terms governing use, modification, and redistribution, is contained in
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# the COPYING file, which can be found at the root of the source code
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# distribution tree, or in https://www.hdfgroup.org/licenses.
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# If you do not have access to either file, you may request a copy from
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# help@hdfgroup.org.
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#
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# Run program in background
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#
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use warnings;
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use strict;
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use Carp;
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use Time::HiRes;
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use POSIX 'setsid';
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my $child_pid;
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my $child_proc;
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my $cmd = $ARGV[0];
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my $debug = 1;
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print "\nStart child process\n";
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start_child();
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print "\nStarted child process\n";
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sub start_child {
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die "cannot execute cmd: $cmd" unless -x $cmd;
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if ($^O eq 'MSWin32') { # Windows
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require Win32::Process;
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Win32::Process::Create($child_proc, $cmd, $cmd, 0, 0, ".") || confess "Could not spawn child: $!";
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$child_pid = $child_proc->GetProcessID();
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}
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else { # Unix
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$SIG{CHLD} = 'IGNORE';
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$child_pid = fork();
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unless (defined $child_pid) {
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confess "Could not spawn child (Unix): $!";
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}
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if ($child_pid == 0) { # child
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unless ($debug) {
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open STDIN, "<", "/dev/null" or die "Can't read /dev/null: $!";
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open STDOUT, ">", "/dev/null" or die "Can't write /dev/null: $!";
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}
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setsid or warn "setsid cannot start a new session: $!";
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unless ($debug) {
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open STDERR, '>&STDOUT' or die "Can't dup stdout: $!";
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}
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local $| = 1;
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unless (exec($cmd)) {
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confess "Could not start child: $cmd: $!";
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CORE::exit(0);
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}
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}
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# parent
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$SIG{CHLD} = 'DEFAULT';
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}
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# catch early child exit, e.g. if program path is incorrect
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sleep(1.0);
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POSIX::waitpid(-1, POSIX::WNOHANG()); # clean up any defunct child process
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if (kill(0,$child_pid)) {
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print "\nStarted child process id $child_pid\n";
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}
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else {
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warn "Child process exited quickly: $cmd: process $child_pid";
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}
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}
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sub stop_child
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{
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if ($^O eq 'MSWin32') { # Windows
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Win32::Process::KillProcess($child_pid,0);
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}
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else { # Unix
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kill 9, $child_pid || warn "could not kill process $child_pid: $!";
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}
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print "Stopped child process id $child_pid\n";
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}
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