161 lines
3.3 KiB
Perl
161 lines
3.3 KiB
Perl
# IO::Pipe.pm
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#
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# Copyright (c) 1996-8 Graham Barr <gbarr@pobox.com>. All rights reserved.
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# This program is free software; you can redistribute it and/or
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# modify it under the same terms as Perl itself.
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package IO::Pipe;
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use 5.006_001;
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use IO::Handle;
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use strict;
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our($VERSION);
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use Carp;
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use Symbol;
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$VERSION = "1.15";
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sub new {
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my $type = shift;
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my $class = ref($type) || $type || "IO::Pipe";
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@_ == 0 || @_ == 2 or croak "usage: $class->([READFH, WRITEFH])";
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my $me = bless gensym(), $class;
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my($readfh,$writefh) = @_ ? @_ : $me->handles;
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pipe($readfh, $writefh)
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or return undef;
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@{*$me} = ($readfh, $writefh);
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$me;
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}
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sub handles {
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@_ == 1 or croak 'usage: $pipe->handles()';
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(IO::Pipe::End->new(), IO::Pipe::End->new());
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}
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my $do_spawn = $^O eq 'os2' || $^O eq 'MSWin32';
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sub _doit {
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my $me = shift;
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my $rw = shift;
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my $pid = $do_spawn ? 0 : fork();
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if($pid) { # Parent
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return $pid;
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}
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elsif(defined $pid) { # Child or spawn
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my $fh;
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my $io = $rw ? \*STDIN : \*STDOUT;
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my ($mode, $save) = $rw ? "r" : "w";
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if ($do_spawn) {
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require Fcntl;
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$save = IO::Handle->new_from_fd($io, $mode);
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my $handle = shift;
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# Close in child:
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unless ($^O eq 'MSWin32') {
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fcntl($handle, Fcntl::F_SETFD(), 1) or croak "fcntl: $!";
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}
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$fh = $rw ? ${*$me}[0] : ${*$me}[1];
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} else {
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shift;
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$fh = $rw ? $me->reader() : $me->writer(); # close the other end
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}
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bless $io, "IO::Handle";
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$io->fdopen($fh, $mode);
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$fh->close;
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if ($do_spawn) {
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$pid = eval { system 1, @_ }; # 1 == P_NOWAIT
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my $err = $!;
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$io->fdopen($save, $mode);
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$save->close or croak "Cannot close $!";
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croak "IO::Pipe: Cannot spawn-NOWAIT: $err" if not $pid or $pid < 0;
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return $pid;
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} else {
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exec @_ or
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croak "IO::Pipe: Cannot exec: $!";
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}
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}
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else {
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croak "IO::Pipe: Cannot fork: $!";
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}
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# NOT Reached
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}
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sub reader {
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@_ >= 1 or croak 'usage: $pipe->reader( [SUB_COMMAND_ARGS] )';
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my $me = shift;
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return undef
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unless(ref($me) || ref($me = $me->new));
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my $fh = ${*$me}[0];
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my $pid;
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$pid = $me->_doit(0, $fh, @_)
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if(@_);
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close ${*$me}[1];
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bless $me, ref($fh);
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*$me = *$fh; # Alias self to handle
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$me->fdopen($fh->fileno,"r")
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unless defined($me->fileno);
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bless $fh; # Really wan't un-bless here
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${*$me}{'io_pipe_pid'} = $pid
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if defined $pid;
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$me;
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}
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sub writer {
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@_ >= 1 or croak 'usage: $pipe->writer( [SUB_COMMAND_ARGS] )';
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my $me = shift;
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return undef
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unless(ref($me) || ref($me = $me->new));
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my $fh = ${*$me}[1];
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my $pid;
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$pid = $me->_doit(1, $fh, @_)
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if(@_);
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close ${*$me}[0];
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bless $me, ref($fh);
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*$me = *$fh; # Alias self to handle
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$me->fdopen($fh->fileno,"w")
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unless defined($me->fileno);
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bless $fh; # Really wan't un-bless here
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${*$me}{'io_pipe_pid'} = $pid
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if defined $pid;
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$me;
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}
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package IO::Pipe::End;
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our(@ISA);
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@ISA = qw(IO::Handle);
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sub close {
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my $fh = shift;
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my $r = $fh->SUPER::close(@_);
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waitpid(${*$fh}{'io_pipe_pid'},0)
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if(defined ${*$fh}{'io_pipe_pid'});
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$r;
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}
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1;
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__END__
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