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Current File : /proc/3/root/proc/2/cwd/usr/share/perl5/Dpkg/Lock.pm
# Copyright © 2011 Raphaël Hertzog <hertzog@debian.org>
# Copyright © 2012 Guillem Jover <guillem@debian.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

package Dpkg::Lock;

use strict;
use warnings;

our $VERSION = '0.01';
our @EXPORT = qw(
    file_lock
);

use Exporter qw(import);
use Fcntl qw(:flock);

use Dpkg::Gettext;
use Dpkg::ErrorHandling;

sub file_lock($$) {
    my ($fh, $filename) = @_;

    # A strict dependency on libfile-fcntllock-perl being it an XS module,
    # and dpkg-dev indirectly making use of it, makes building new perl
    # package which bump the perl ABI impossible as these packages cannot
    # be installed alongside.
    eval q{
        pop @INC if $INC[-1] eq '.';
        use File::FcntlLock;
    };
    if ($@) {
        # On Linux systems the flock() locks get converted to file-range
        # locks on NFS mounts.
        if ($^O ne 'linux') {
            warning(g_('File::FcntlLock not available; using flock which is not NFS-safe'));
        }
        flock($fh, LOCK_EX)
            or syserr(g_('failed to get a write lock on %s'), $filename);
    } else {
        eval q{
            my $fs = File::FcntlLock->new(l_type => F_WRLCK);
            $fs->lock($fh, F_SETLKW)
                or syserr(g_('failed to get a write lock on %s'), $filename);
        }
    }
}

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