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|
#!/usr/bin/perl
# -*- cperl -*-
# Copyright (c) 2007, 2011, Oracle and/or its affiliates
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
use strict;
use warnings;
use lib 'lib';
use My::SafeProcess::Base;
use POSIX qw(WNOHANG);
###########################################################################
# Util functions
###########################################################################
#
#Print message to stderr
#
my $verbose= 0;
sub message {
if ($verbose > 0){
use Time::localtime;
my $tm= localtime();
my $timestamp= sprintf("%02d%02d%02d %2d:%02d:%02d",
$tm->year % 100, $tm->mon+1, $tm->mday,
$tm->hour, $tm->min, $tm->sec);
print STDERR $timestamp, " monitor[$$]: ", @_, "\n";
}
}
###########################################################################
# Main program
###########################################################################
my $terminated= 0;
# Protect against being killed in the middle
# of child creation, just set the terminated flag
# to make sure the child will be killed off
# when program is ready to do that
$SIG{TERM}= sub { message("!Got signal @_"); $terminated= 1; };
$SIG{INT}= sub { message("!Got signal @_"); $terminated= 1; };
my $parent_pid= getppid();
my $found_double_dash= 0;
while (my $arg= shift(@ARGV)){
if ($arg =~ /^--$/){
$found_double_dash= 1;
last;
}
elsif ($arg =~ /^--verbose$/){
$verbose= 1;
}
else {
die "Unknown option: $arg";
}
}
my $path= shift(@ARGV); # Executable
die "usage:\n" .
" safe_process.pl [opts] -- <path> [<args> [...<args_n>]]"
unless defined $path || $found_double_dash;
message("started");
#message("path: '$path'");
message("parent: $parent_pid");
# Start process to monitor
my $child_pid=
create_process(
path => $path,
args => \@ARGV,
setpgrp => 1,
);
message("Started child $child_pid");
eval {
sub handle_signal {
$terminated= 1;
message("Got signal @_");
# Ignore all signals
foreach my $name (keys %SIG){
$SIG{$name}= 'IGNORE';
}
die "signaled\n";
};
local $SIG{TERM}= \&handle_signal;
local $SIG{INT}= \&handle_signal;
local $SIG{CHLD}= sub {
message("Got signal @_");
kill('KILL', -$child_pid);
my $ret= waitpid($child_pid, 0);
if ($? & 127){
exit(65); # Killed by signal
}
exit($? >> 8);
};
# Monitoring loop
while(!$terminated) {
# Check if parent is still alive
if (kill(0, $parent_pid) < 1){
message("Parent is not alive anymore");
last;
}
# Wait for child to terminate but wakeup every
# second to also check that parent is still alive
my $ret_pid;
$ret_pid= waitpid($child_pid, &WNOHANG);
if ($ret_pid == $child_pid) {
# Process has exited, collect return status
my $ret_code= $? >> 8;
message("Child exit: $ret_code");
# Exit with exit status of the child
exit ($ret_code);
}
sleep(1);
}
};
if ( $@ ) {
# The monitoring loop should have been
# broken by handle_signal
warn "Unexpected: $@" unless ( $@ =~ /signaled/ );
}
# Use negative pid in order to kill the whole
# process group
#
my $ret= kill('KILL', -$child_pid);
message("Killed child: $child_pid, ret: $ret");
if ($ret > 0) {
message("Killed child: $child_pid");
# Wait blocking for the child to return
my $ret_pid= waitpid($child_pid, 0);
if ($ret_pid != $child_pid){
message("unexpected pid $ret_pid returned from waitpid($child_pid)");
}
}
message("DONE!");
exit (1);
|
