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#!perl -w
BEGIN {
require './test.pl';
skip_all_if_miniperl();
skip_all_without_config(qw(d_fork));
}
use strict;
use constant TRUE => ($^X, '-e', 'exit 0');
use Data::Dumper;
plan tests => 4;
SKIP: {
skip 'Platform doesn\'t support SIGCHLD', 4 if not exists $SIG{CHLD};
require POSIX;
require Time::HiRes;
my $pid = fork // die "Can't fork: $!";
unless ($pid) {
note("Child PID: $$");
Time::HiRes::sleep(0.250);
POSIX::_exit(0);
}
test_system('without reaper');
my @pids;
$SIG{CHLD} = sub {
while ((my $child = waitpid(-1, POSIX::WNOHANG())) > 0) {
note "Reaped: $child";
push @pids, $child;
}
};
test_system('with reaper');
note("Waiting briefly for SIGCHLD...");
Time::HiRes::sleep(0.500);
ok(@pids == 1, 'Reaped only one process');
ok($pids[0] == $pid, "Reaped the right process.") or diag(Dumper(\@pids));
}
sub test_system {
my $subtest = shift;
my $expected_zeroes = 10;
my $got_zeroes = 0;
# This test is looking for a race between system()'s waitpid() and a
# signal handler. Looping a few times increases the chances of
# catching the error.
for (1..$expected_zeroes) {
$got_zeroes++ unless system(TRUE);
}
is(
$got_zeroes, $expected_zeroes,
"system() $subtest succeeded $got_zeroes times out of $expected_zeroes"
);
}
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