diff options
Diffstat (limited to 'lib/open3.pl')
| -rw-r--r-- | lib/open3.pl | 110 |
1 files changed, 8 insertions, 102 deletions
diff --git a/lib/open3.pl b/lib/open3.pl index 8b3917a851..7fcc931861 100644 --- a/lib/open3.pl +++ b/lib/open3.pl @@ -1,106 +1,12 @@ -# &open3: Marc Horowitz <marc@mit.edu> -# derived mostly from &open2 by tom christiansen, <tchrist@convex.com> +# This is a compatibility interface to IPC::Open3. New programs should +# do # -# $Id: open3.pl,v 1.1 1993/11/23 06:26:15 marc Exp $ +# use IPC::Open3; # -# usage: $pid = open3('wtr', 'rdr', 'err' 'some cmd and args', 'optarg', ...); +# instead of # -# spawn the given $cmd and connect rdr for -# reading, wtr for writing, and err for errors. -# if err is '', or the same as rdr, then stdout and -# stderr of the child are on the same fh. returns pid -# of child, or 0 on failure. +# require 'open3.pl'; - -# if wtr begins with '>&', then wtr will be closed in the parent, and -# the child will read from it directly. if rdr or err begins with -# '>&', then the child will send output directly to that fd. In both -# cases, there will be a dup() instead of a pipe() made. - - -# WARNING: this is dangerous, as you may block forever -# unless you are very careful. -# -# $wtr is left unbuffered. -# -# abort program if -# rdr or wtr are null -# pipe or fork or exec fails - -package open3; - -$fh = 'FHOPEN000'; # package static in case called more than once - -sub main'open3 { - local($kidpid); - local($dad_wtr, $dad_rdr, $dad_err, @cmd) = @_; - local($dup_wtr, $dup_rdr, $dup_err); - - $dad_wtr || die "open3: wtr should not be null"; - $dad_rdr || die "open3: rdr should not be null"; - $dad_err = $dad_rdr if ($dad_err eq ''); - - $dup_wtr = ($dad_wtr =~ s/^\>\&//); - $dup_rdr = ($dad_rdr =~ s/^\>\&//); - $dup_err = ($dad_err =~ s/^\>\&//); - - # force unqualified filehandles into callers' package - local($package) = caller; - $dad_wtr =~ s/^([^']+$)/$package'$1/; - $dad_rdr =~ s/^([^']+$)/$package'$1/; - $dad_err =~ s/^([^']+$)/$package'$1/; - - local($kid_rdr) = ++$fh; - local($kid_wtr) = ++$fh; - local($kid_err) = ++$fh; - - if (!$dup_wtr) { - pipe($kid_rdr, $dad_wtr) || die "open3: pipe 1 (stdin) failed: $!"; - } - if (!$dup_rdr) { - pipe($dad_rdr, $kid_wtr) || die "open3: pipe 2 (stdout) failed: $!"; - } - if ($dad_err ne $dad_rdr && !$dup_err) { - pipe($dad_err, $kid_err) || die "open3: pipe 3 (stderr) failed: $!"; - } - - if (($kidpid = fork) < 0) { - die "open2: fork failed: $!"; - } elsif ($kidpid == 0) { - if ($dup_wtr) { - open(STDIN, "<&$dad_wtr") if (fileno(STDIN) != fileno($dad_wtr)); - } else { - close($dad_wtr); - open(STDIN, "<&$kid_rdr"); - } - if ($dup_rdr) { - open(STDOUT, ">&$dad_rdr") if (fileno(STDOUT) != fileno($dad_rdr)); - } else { - close($dad_rdr); - open(STDOUT, ">&$kid_wtr"); - } - if ($dad_rdr ne $dad_err) { - if ($dup_err) { - open(STDERR, ">&$dad_err") - if (fileno(STDERR) != fileno($dad_err)); - } else { - close($dad_err); - open(STDERR, ">&$kid_err"); - } - } else { - open(STDERR, ">&STDOUT") if (fileno(STDERR) != fileno(STDOUT)); - } - local($")=(" "); - exec @cmd; - die "open2: exec of @cmd failed"; - } - - close $kid_rdr; close $kid_wtr; close $kid_err; - if ($dup_wtr) { - close($dad_wtr); - } - - select((select($dad_wtr), $| = 1)[0]); # unbuffer pipe - $kidpid; -} -1; # so require is happy +package main; +use IPC::Open3 'open3'; +1 |