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Edit File : Pipe.pm \| Size : 5.34 KB
# 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 5.006_001; use IO::Handle; use strict; our($VERSION); use Carp; use Symbol; $VERSION = "1.15"; 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 Back

Edit File : Pipe.pm | Size : 5.34 KB

# 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 5.006_001;

use IO::Handle;
use strict;
our($VERSION);
use Carp;
use Symbol;

$VERSION = "1.15";

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;
}

__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 ...
	}

$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

=cut

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