1#!/usr/bin/perl 2# $OpenBSD: testfd.pl,v 1.2 2014/07/11 22:28:51 bluhm Exp $ 3 4# Copyright (c) 2014 Alexander Bluhm <bluhm@openbsd.org> 5# 6# Permission to use, copy, modify, and distribute this software for any 7# purpose with or without fee is hereby granted, provided that the above 8# copyright notice and this permission notice appear in all copies. 9# 10# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 18# Test file descriptor passing with the Perl xs module PassFd. 19 20use strict; 21use warnings; 22use Socket; 23use Fcntl qw(F_SETFD FD_CLOEXEC); 24use PassFd qw(sendfd recvfd); 25use POSIX qw(_exit); 26 27socketpair(my $parent, my $child, AF_UNIX, SOCK_STREAM, PF_UNSPEC) 28 or die "socketpair failed: $!"; 29$child->fcntl(F_SETFD, 0) 30 or die "fcntl setfd failed: $!"; 31 32defined(my $pid = fork()) 33 or die "fork failed: $!"; 34unless ($pid) { 35 # child process 36 close($parent) 37 or do { warn "Close parent socket failed: $!"; _exit(1); }; 38 open(my $fd, '<', $0) 39 or do { warn "Open $0 failed: $!"; _exit(1); }; 40 sendfd($child, $fd) 41 or do { warn "Sendfd failed: $!"; _exit(1); }; 42 _exit(0); 43} 44# parent process 45close($child) 46 or die "Close child socket failed: $!"; 47my $fd = recvfd($parent) 48 or die "Recvfd failed: $!"; 49wait() 50 or die "Wait failed: $!"; 51$? == 0 52 or die "Child process failed: $?"; 53 54defined (my $line = <$fd>) 55 or die "Read from fd failed: $!"; 56$line =~ /perl/ 57 or die "Could not read perl from fd: $line\n"; 58 59warn "Passing fd successful\n"; 60exit 0; 61