BEGIN {
chdir 't' if -d 't';
unshift @INC, '../lib';
}
BEGIN {
use Config;
unless ($Config{d_fork}) {
print "1..0 # Skip: no fork\n";
exit 0;
}
eval 'use POSIX qw(sys_wait_h)';
if ($@) {
print "1..0 # Skip: no POSIX sys_wait_h\n";
exit 0;
}
eval 'use Time::HiRes qw(time)';
if ($@) {
print "1..0 # Skip: no Time::HiRes\n";
exit 0;
}
}
use warnings;
use strict;
$| = 1;
print "1..1\n";
sub NEG1_PROHIBITED () { 0x01 }
sub NEG1_REQUIRED () { 0x02 }
my $count = 0;
my $max_count = 9;
my $state = NEG1_PROHIBITED;
my $child_pid = fork();
# Parent receives a nonzero child PID.
if ($child_pid) {
my $ok = 1;
while ($count++ < $max_count) {
my $begin_time = time();
my $ret = waitpid( -1, WNOHANG );
my $elapsed_time = time() - $begin_time;
printf( "# waitpid(-1,WNOHANG) returned %d after %.2f seconds\n",
$ret, $elapsed_time );
if ($elapsed_time > 0.5) {
printf( "# %.2f seconds in non-blocking waitpid is too long!\n",
$elapsed_time );
$ok = 0;
last;
}
if ($state & NEG1_PROHIBITED) {
if ($ret == -1) {
print "# waitpid should not have returned -1 here!\n";
$ok = 0;
last;
}
elsif ($ret == $child_pid) {
$state = NEG1_REQUIRED;
}
}
elsif ($state & NEG1_REQUIRED) {
unless ($ret == -1) {
print "# waitpid should have returned -1 here\n";
$ok = 0;
}
last;
}
sleep(1);
}
print $ok ? "ok 1\n" : "not ok 1\n";
exit(0); # parent
} else {
# Child receives a zero PID and can request parent's PID with
# getppid().
sleep(3);
exit(0);
}