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71 lines
1.9 KiB
Perl
Executable File
71 lines
1.9 KiB
Perl
Executable File
#!/usr/bin/perl
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# pnohang: executes command ($4-) with output in file ($3)
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# kills command if no output within $1 seconds with message in $2
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# usage: pnohang timeout file command args ...
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require "ctime.pl";
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if ($#ARGV < 3) {
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print "usage: pnohang timeout outfile message command [args...]\n";
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exit 1;
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}
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$timeout=$ARGV[0];
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$outfile=$ARGV[1];
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$message=$ARGV[2];
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splice(@ARGV, 0, 3);
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$pid=$$;
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#print "timeout is ", $timeout, "\n";
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#print "outfile is ", $outfile, "\n";
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#print "message is ", $message, "\n";
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#print "arguments are ", "@ARGV", "\n";
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if ($pid1 = fork) {
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if ($pid2 = fork) {
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local $SIG{TERM} = 'IGNORE';
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# parent
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#print 'child pids are ', $pid1, ' ', $pid2, "\n";
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$child=wait;
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$status=$?;
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#print "exited child is $child, status is $status\n";
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if ($pid1 = $child) {
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#print "killing process $pid2 (second child)\n";
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kill 'TERM', $pid2;
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}
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else {
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#print "killing process $pid1 (first child)\n";
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kill 'TERM', $pid1;
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}
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# exit status in upper 8 bits, killed signal (if any) in lower 8 bits
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exit (($status >> 8) | ($status & 0xff)) ;
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}
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else {
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# second child
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for (;;) {
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#local $^W = 0;
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$now = time;
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sleep $timeout;
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($dev, $ino, $mode, $nlink, $uid, $gid, $rdev, $size, $atime, $mtime, $ctime, $blksize, $blocks)
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= stat($outfile);
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if ($now > $mtime) {
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# system "logger -t pnohang killing @ARGV $message, pid $pid since no output in $timeout seconds";
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print "pnohang: killing @ARGV ($message, pid $pid1 and $pid) since no output in $timeout seconds since ", &ctime($now);
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print "ps jgx before the signal\n";
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system "ps jgxww";
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sleep 1; # give it a chance to output message
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kill 'TERM' => -$pid1;
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sleep 1;
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kill 'TERM' => -$pid;
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sleep 1;
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print "ps jgx after the signal\n";
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system "ps jgxww";
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exit 1;
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}
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}
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}
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}
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else {
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# first child
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#print "executing @ARGV\n";
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exec "@ARGV >$outfile 2>&1";
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}
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