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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
commite0c6872cf40896c7be36b11dcc744620f10adf1d (patch)
tree60335e10d2f4354b0674ec22d7b53f0f8abee672 /systems/texlive/tlnet/tlpkg/tlperl/lib/IO/Pipe.pm
Initial commit
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+# IO::Pipe.pm
+#
+# Copyright (c) 1996-8 Graham Barr <gbarr@pobox.com>. All rights reserved.
+# This program is free software; you can redistribute it and/or
+# modify it under the same terms as Perl itself.
+
+package IO::Pipe;
+
+use 5.008_001;
+
+use IO::Handle;
+use strict;
+use Carp;
+use Symbol;
+
+our $VERSION = "1.39";
+
+sub new {
+ my $type = shift;
+ my $class = ref($type) || $type || "IO::Pipe";
+ @_ == 0 || @_ == 2 or croak "usage: $class->([READFH, WRITEFH])";
+
+ my $me = bless gensym(), $class;
+
+ my($readfh,$writefh) = @_ ? @_ : $me->handles;
+
+ pipe($readfh, $writefh)
+ or return undef;
+
+ @{*$me} = ($readfh, $writefh);
+
+ $me;
+}
+
+sub handles {
+ @_ == 1 or croak 'usage: $pipe->handles()';
+ (IO::Pipe::End->new(), IO::Pipe::End->new());
+}
+
+my $do_spawn = $^O eq 'os2' || $^O eq 'MSWin32';
+
+sub _doit {
+ my $me = shift;
+ my $rw = shift;
+
+ my $pid = $do_spawn ? 0 : fork();
+
+ if($pid) { # Parent
+ return $pid;
+ }
+ elsif(defined $pid) { # Child or spawn
+ my $fh;
+ my $io = $rw ? \*STDIN : \*STDOUT;
+ my ($mode, $save) = $rw ? "r" : "w";
+ if ($do_spawn) {
+ require Fcntl;
+ $save = IO::Handle->new_from_fd($io, $mode);
+ my $handle = shift;
+ # Close in child:
+ unless ($^O eq 'MSWin32') {
+ fcntl($handle, Fcntl::F_SETFD(), 1) or croak "fcntl: $!";
+ }
+ $fh = $rw ? ${*$me}[0] : ${*$me}[1];
+ } else {
+ shift;
+ $fh = $rw ? $me->reader() : $me->writer(); # close the other end
+ }
+ bless $io, "IO::Handle";
+ $io->fdopen($fh, $mode);
+ $fh->close;
+
+ if ($do_spawn) {
+ $pid = eval { system 1, @_ }; # 1 == P_NOWAIT
+ my $err = $!;
+
+ $io->fdopen($save, $mode);
+ $save->close or croak "Cannot close $!";
+ croak "IO::Pipe: Cannot spawn-NOWAIT: $err" if not $pid or $pid < 0;
+ return $pid;
+ } else {
+ exec @_ or
+ croak "IO::Pipe: Cannot exec: $!";
+ }
+ }
+ else {
+ croak "IO::Pipe: Cannot fork: $!";
+ }
+
+ # NOT Reached
+}
+
+sub reader {
+ @_ >= 1 or croak 'usage: $pipe->reader( [SUB_COMMAND_ARGS] )';
+ my $me = shift;
+
+ return undef
+ unless(ref($me) || ref($me = $me->new));
+
+ my $fh = ${*$me}[0];
+ my $pid;
+ $pid = $me->_doit(0, $fh, @_)
+ if(@_);
+
+ close ${*$me}[1];
+ bless $me, ref($fh);
+ *$me = *$fh; # Alias self to handle
+ $me->fdopen($fh->fileno,"r")
+ unless defined($me->fileno);
+ bless $fh; # Really wan't un-bless here
+ ${*$me}{'io_pipe_pid'} = $pid
+ if defined $pid;
+
+ $me;
+}
+
+sub writer {
+ @_ >= 1 or croak 'usage: $pipe->writer( [SUB_COMMAND_ARGS] )';
+ my $me = shift;
+
+ return undef
+ unless(ref($me) || ref($me = $me->new));
+
+ my $fh = ${*$me}[1];
+ my $pid;
+ $pid = $me->_doit(1, $fh, @_)
+ if(@_);
+
+ close ${*$me}[0];
+ bless $me, ref($fh);
+ *$me = *$fh; # Alias self to handle
+ $me->fdopen($fh->fileno,"w")
+ unless defined($me->fileno);
+ bless $fh; # Really wan't un-bless here
+ ${*$me}{'io_pipe_pid'} = $pid
+ if defined $pid;
+
+ $me;
+}
+
+package IO::Pipe::End;
+
+our(@ISA);
+
+@ISA = qw(IO::Handle);
+
+sub close {
+ my $fh = shift;
+ my $r = $fh->SUPER::close(@_);
+
+ waitpid(${*$fh}{'io_pipe_pid'},0)
+ if(defined ${*$fh}{'io_pipe_pid'});
+
+ $r;
+}
+
+1;
+
+__END__
+
+=head1 NAME
+
+IO::Pipe - supply object methods for pipes
+
+=head1 SYNOPSIS
+
+ use IO::Pipe;
+
+ $pipe = IO::Pipe->new();
+
+ if($pid = fork()) { # Parent
+ $pipe->reader();
+
+ while(<$pipe>) {
+ ...
+ }
+
+ }
+ elsif(defined $pid) { # Child
+ $pipe->writer();
+
+ print $pipe ...
+ }
+
+ or
+
+ $pipe = IO::Pipe->new();
+
+ $pipe->reader(qw(ls -l));
+
+ while(<$pipe>) {
+ ...
+ }
+
+=head1 DESCRIPTION
+
+C<IO::Pipe> provides an interface to creating pipes between
+processes.
+
+=head1 CONSTRUCTOR
+
+=over 4
+
+=item new ( [READER, WRITER] )
+
+Creates an C<IO::Pipe>, which is a reference to a newly created symbol
+(see the C<Symbol> package). C<IO::Pipe::new> optionally takes two
+arguments, which should be objects blessed into C<IO::Handle>, or a
+subclass thereof. These two objects will be used for the system call
+to C<pipe>. If no arguments are given then method C<handles> is called
+on the new C<IO::Pipe> object.
+
+These two handles are held in the array part of the GLOB until either
+C<reader> or C<writer> is called.
+
+=back
+
+=head1 METHODS
+
+=over 4
+
+=item reader ([ARGS])
+
+The object is re-blessed into a sub-class of C<IO::Handle>, and becomes a
+handle at the reading end of the pipe. If C<ARGS> are given then C<fork>
+is called and C<ARGS> are passed to exec.
+
+=item writer ([ARGS])
+
+The object is re-blessed into a sub-class of C<IO::Handle>, and becomes a
+handle at the writing end of the pipe. If C<ARGS> are given then C<fork>
+is called and C<ARGS> are passed to exec.
+
+=item handles ()
+
+This method is called during construction by C<IO::Pipe::new>
+on the newly created C<IO::Pipe> object. It returns an array of two objects
+blessed into C<IO::Pipe::End>, or a subclass thereof.
+
+=back
+
+=head1 SEE ALSO
+
+L<IO::Handle>
+
+=head1 AUTHOR
+
+Graham Barr. Currently maintained by the Perl Porters. Please report all
+bugs to <perlbug@perl.org>.
+
+=head1 COPYRIGHT
+
+Copyright (c) 1996-8 Graham Barr <gbarr@pobox.com>. All rights reserved.
+This program is free software; you can redistribute it and/or
+modify it under the same terms as Perl itself.
+
+=cut