48 lines
1.3 KiB
Perl
Executable File
48 lines
1.3 KiB
Perl
Executable File
#! /usr/bin/perl
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# $OpenBSD: dolock,v 1.3 2007/06/02 12:03:56 espie Exp $
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# Copyright (c) 2004 Marc Espie <espie@openbsd.org>
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#
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# Permission to use, copy, modify, and distribute this software for any
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# purpose with or without fee is hereby granted, provided that the above
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# copyright notice and this permission notice appear in all copies.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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use strict;
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use warnings;
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use Fcntl;
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use File::Basename;
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if (@ARGV == 0) {
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exit(1);
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}
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my $fname = shift;
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my $dname = dirname $fname;
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my $done = 0;
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unless (-d $dname) {
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require File::Path;
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File::Path::mkpath($dname);
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}
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while(1) {
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if (sysopen my $handle, $fname, O_WRONLY | O_EXCL | O_CREAT, 0666) {
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if (@ARGV) {
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print $handle join("\n", @ARGV), "\n";
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}
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close($handle);
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exit(0);
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}
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unless ($done) {
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print STDERR "Awaiting lock $fname\n";
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$done = 1;
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}
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sleep(1);
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}
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