diff options
Diffstat (limited to 'bin')
-rwxr-xr-x | bin/runbkgprog | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/bin/runbkgprog b/bin/runbkgprog new file mode 100755 index 0000000..69fa2d0 --- /dev/null +++ b/bin/runbkgprog @@ -0,0 +1,87 @@ +#!/usr/bin/perl -w +require 5.003; +$indent=4; + +# +# Copyright by The HDF Group. +# Copyright by the Board of Trustees of the University of Illinois. +# All rights reserved. +# +# This file is part of HDF5. The full HDF5 copyright notice, including +# terms governing use, modification, and redistribution, is contained in +# the COPYING file, which can be found at the root of the source code +# distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. +# If you do not have access to either file, you may request a copy from +# help@hdfgroup.org. +# + +# Run program in background +# +use warnings; +use strict; + +use Carp; +use Time::HiRes; +use POSIX 'setsid'; + +my $child_pid; +my $child_proc; +my $cmd = $ARGV[0]; +my $debug = 1; + +print "\nStart child process\n"; +start_child(); +print "\nStarted child process\n"; + +sub start_child { + die "cannot execute cmd: $cmd" unless -x $cmd; + if ($^O eq 'MSWin32') { # Windows + require Win32::Process; + Win32::Process::Create($child_proc, $cmd, $cmd, 0, 0, ".") || confess "Could not spawn child: $!"; + $child_pid = $child_proc->GetProcessID(); + } + else { # Unix + $SIG{CHLD} = 'IGNORE'; + $child_pid = fork(); + unless (defined $child_pid) { + confess "Could not spawn child (Unix): $!"; + } + if ($child_pid == 0) { # child + unless ($debug) { + open STDIN, "<", "/dev/null" or die "Can't read /dev/null: $!"; + open STDOUT, ">", "/dev/null" or die "Can't write /dev/null: $!"; + } + setsid or warn "setsid cannot start a new session: $!"; + unless ($debug) { + open STDERR, '>&STDOUT' or die "Can't dup stdout: $!"; + } + local $| = 1; + unless (exec($cmd)) { + confess "Could not start child: $cmd: $!"; + CORE::exit(0); + } + } + # parent + $SIG{CHLD} = 'DEFAULT'; + } + # catch early child exit, e.g. if program path is incorrect + sleep(1.0); + POSIX::waitpid(-1, POSIX::WNOHANG()); # clean up any defunct child process + if (kill(0,$child_pid)) { + print "\nStarted child process id $child_pid\n"; + } + else { + warn "Child process exited quickly: $cmd: process $child_pid"; + } +} + +sub stop_child +{ + if ($^O eq 'MSWin32') { # Windows + Win32::Process::KillProcess($child_pid,0); + } + else { # Unix + kill 9, $child_pid || warn "could not kill process $child_pid: $!"; + } + print "Stopped child process id $child_pid\n"; +} |