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#!/usr/bin/env perl
use strict;
open(my $ps, "-|", "ps -wwf");
my $cols_known = 0;
my $cmd_col = 0;
my $pid_col = 0;
while (<$ps>) {
print;
my @cols = split(/\s+/);
if (!$cols_known && /CMD/) {
# Parse relevant ps column headers
for (my $i = 0; $i <= $#cols; $i++) {
if ($cols[$i] eq "CMD") {
$cmd_col = $i;
}
if ($cols[$i] eq "PID") {
$pid_col = $i;
}
}
$cols_known = 1;
} else {
my $pid = $cols[$pid_col];
my $cmd = $cols[$cmd_col];
# Match numeric PID and relative path command
# -> The intention is only to dump stack traces for hangs in code under
# test, which means we probably just built it and are executing by
# relative path (e.g. ./my_test or foo/bar_test) rather then by absolute
# path (e.g. /usr/bin/time) or PATH search (e.g. grep).
if ($pid =~ /^[0-9]+$/ && $cmd =~ /^[^\/ ]+[\/]/) {
print "Dumping stacks for $pid...\n";
system("pstack $pid || gdb -batch -p $pid -ex 'thread apply all bt'");
}
}
}
close $ps;
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