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74 lines
2 KiB
Perl
Executable file
74 lines
2 KiB
Perl
Executable file
#!/usr/bin/perl
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#
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# $Cambridge: hermes/src/2exchange/scripts/watchdog.pl,v 1.5 2017/02/10 09:57:11 dpc22 Exp $
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#
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# Watchdog wrapper which runs shell script as subprocess collecting output
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# in file. Kills child process if it doesn't generate output after $TIMEOUT
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my $TIMEOUT = (30*60); # 30 minutes
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use strict;
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use warnings;
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(@ARGV == 2) or die "watchdog.pl args: cmdfile outfile\n";
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my $cmdfile=$ARGV[0];
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my $outfile=$ARGV[1];
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# Touch outfile to make sure timestamp up to date. Don't blat existing content.
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open(my $fh, ">>", $outfile) or die "Failed to open $outfile: $!\n";
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close($fh);
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open($fh, "<", $cmdfile) or die "Failed to open $cmdfile: $!\n";
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my $cmd = <$fh>;
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close($fh);
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chomp($cmd);
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my $cmd_pid = fork();
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die "watchdog.pl Could not fork(): $_\n" if not defined $cmd_pid;
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if (not $cmd_pid) {
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open (STDOUT, '>>', $outfile);
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open (STDERR, '>&', STDOUT);
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exec($cmd);
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exit 1;
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}
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my $watchdog_pid = fork();
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die "Could not fork(): $_\n" if not defined $watchdog_pid;
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if (not $watchdog_pid) {
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while (1) {
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my $now = time;
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my @stat = stat $outfile;
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my $mtime = (@stat) ? $stat[9] : $now;
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last if (($now - $mtime) > ${TIMEOUT});
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sleep(1);
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}
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exit 1;
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}
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######################################################################
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# Wait for either subprocess to finish. Then kill the other one and wait
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# for that to finish as well. Return the exit code from the first process.
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my $pid = wait;
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my $status = $?;
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my $rc = $status >> 8; # Normally 128+N when grandchild catches signal N
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my $signal = $status & 127; # Only nonzero if $cmd_pid shell itself killed
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if ($rc == 0 and $signal != 0) {
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$rc = 128 + $signal; # Paranoia in case $pid shell is killed directly
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}
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die("watchdog.pl: No child process\n") if ($pid < 0);
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if ($pid == $cmd_pid) {
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kill 'TERM', $watchdog_pid;
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} elsif ($pid == $watchdog_pid) {
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kill 'TERM', $cmd_pid;
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} else {
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die "watchdog.pl: Unexpected child process pid: ${pid}\n";
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}
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$pid=wait;
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exit($rc);
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