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|
# Shared Fork Test
#
# This tests the capabilities of fork after lock to
# ensure child retains shared lock even if parent releases it.
# This test uses ->fork() instead of ->newpid()
use strict;
use warnings;
use File::Temp qw(tempfile);
use Test::More tests => 6;
use File::NFSLock;
use Fcntl qw(O_CREAT O_RDWR O_RDONLY O_TRUNC O_APPEND LOCK_EX LOCK_SH LOCK_NB);
$| = 1; # Buffer must be autoflushed because of fork() below.
my $datafile = (tempfile 'XXXXXXXXXX')[1];
# Wipe lock file in case it exists
unlink ("$datafile$File::NFSLock::LOCK_EXTENSION");
# Create a blank file
sysopen ( my $fh, $datafile, O_CREAT | O_RDWR | O_TRUNC );
close ($fh);
ok (-e $datafile && !-s _);
{
# Forced dummy scope
my $lock1 = new File::NFSLock {
file => $datafile,
lock_type => LOCK_SH,
};
ok ($lock1);
my $pid = $lock1->fork;
if (!defined $pid) {
die "fork failed!";
} elsif (!$pid) {
# Child process
# Act busy for a while
sleep 5;
# Now release lock
exit;
} else {
# Fork worked
ok 1;
# Leaving scope should release only the parent side
}
}
# Lock is out of scope, but should
# still be acquired by the child.
# Try to get a non-blocking lock.
# Yes, it is the same process,
# but it should have been delegated
# to the child process.
# This lock should fail.
{
# Forced dummy scope
my $lock2 = new File::NFSLock {
file => $datafile,
lock_type => LOCK_EX|LOCK_NB,
};
ok (!$lock2);
}
# Wait for child to finish
ok(wait);
# Try again now that the child is done.
# This time it should work.
{
# Forced dummy scope
my $lock2 = new File::NFSLock {
file => $datafile,
lock_type => LOCK_EX|LOCK_NB,
};
ok($lock2);
}
# Wipe the temporary file
unlink $datafile;
|
