Avoid POSIX::close when closing files by descriptor in IPC::Open3

Closing a file descriptor with POSIX::close bypasses PerlIO's ref-counting
of file descriptors and leads to MSVC++'s invalid parameter handler being
triggered when the PerlIO stream is closed later because that attempts to
close the underlying file descriptor again, but it's already closed.

So instead, we effectively fdopen() a new PerlIO stream and then close it
again to effect the closure of the file descriptor.

diff --git a/ext/IPC-Open3/lib/IPC/Open3.pm b/ext/IPC-Open3/lib/IPC/Open3.pm
index 31c68af..29612af 100644 (file)
--- a/ext/IPC-Open3/lib/IPC/Open3.pm
+++ b/ext/IPC-Open3/lib/IPC/Open3.pm
@@ -9,7 +9,7 @@ require Exporter;
 use Carp;
 use Symbol qw(gensym qualify);
 
-$VERSION       = '1.12';
+$VERSION       = '1.13';
 @ISA           = qw(Exporter);
 @EXPORT                = qw(open3);
 
@@ -163,7 +163,9 @@ sub xopen {
 }
 
 sub xclose {
-    $_[0] =~ /\A=?(\d+)\z/ ? eval { require POSIX; POSIX::close($1); } : close $_[0]
+    $_[0] =~ /\A=?(\d+)\z/
+       ? do { my $fh; open($fh, $_[1] . '&=' . $1) and close($fh); }
+       : close $_[0]
        or croak "$Me: close($_[0]) failed: $!";
 }
 
@@ -264,7 +266,7 @@ sub _open3 {
                        xopen $_->{handle}, $_->{mode} . '&', $_->{parent}
                            if fileno $_->{handle} != xfileno($_->{parent});
                    } else {
-                       xclose $_->{parent};
+                       xclose $_->{parent}, $_->{mode};
                        xopen $_->{handle}, $_->{mode} . '&=',
                            fileno $_->{open_as};
                    }
@@ -331,12 +333,12 @@ sub _open3 {
 
     foreach (@handles) {
        next if $_->{dup} or $_->{dup_of_out};
-       xclose $_->{open_as};
+       xclose $_->{open_as}, $_->{mode};
     }
 
     # If the write handle is a dup give it away entirely, close my copy
     # of it.
-    xclose $handles[0]{parent} if $handles[0]{dup};
+    xclose $handles[0]{parent}, $handles[0]{mode} if $handles[0]{dup};
 
     select((select($handles[0]{parent}), $| = 1)[0]); # unbuffer pipe
     $kidpid;