From 97828cef4d4cd22b548b8ec430d2e0e28ea8ae8c Mon Sep 17 00:00:00 2001
From: Rafael Garcia-Suarez <rgarciasuarez@gmail.com>
Date: Wed, 25 Sep 2002 23:58:12 +0200
Subject: [PATCH] Re: perlio bug? Message-Id:
 <20020925215812.3b7adb0d.rgarciasuarez@free.fr>

p4raw-id: //depot/perl@17954
---
 doio.c              |  8 +++++---
 pod/perldiag.pod    | 23 +++++++++++------------
 t/lib/warnings/doio | 39 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 55 insertions(+), 15 deletions(-)

diff --git a/doio.c b/doio.c
index a706fbf..fdd83f6 100644
--- a/doio.c
+++ b/doio.c
@@ -536,12 +536,14 @@ Perl_do_openn(pTHX_ GV *gv, register char *name, I32 len, int as_raw,
 	if ((IoTYPE(io) == IoTYPE_RDONLY) &&
 	    (fp == PerlIO_stdout() || fp == PerlIO_stderr())) {
 		Perl_warner(aTHX_ packWARN(WARN_IO),
-			    "Filehandle STD%s opened only for input",
-			    (fp == PerlIO_stdout()) ? "OUT" : "ERR");
+			    "Filehandle STD%s reopened as %s only for input",
+			    ((fp == PerlIO_stdout()) ? "OUT" : "ERR"),
+			    GvENAME(gv));
 	}
 	else if ((IoTYPE(io) == IoTYPE_WRONLY) && fp == PerlIO_stdin()) {
 		Perl_warner(aTHX_ packWARN(WARN_IO),
-			    "Filehandle STDIN opened only for output");
+			    "Filehandle STDIN reopened as %s only for output",
+			    GvENAME(gv));
 	}
     }
 
diff --git a/pod/perldiag.pod b/pod/perldiag.pod
index a0ef21a..a08837d 100644
--- a/pod/perldiag.pod
+++ b/pod/perldiag.pod
@@ -1485,12 +1485,6 @@ PDP-11 or something?
 to be a read-write filehandle, you needed to open it with "+<" or "+>"
 or "+>>" instead of with "<" or nothing.  If you intended only to write
 the file, use ">" or ">>".  See L<perlfunc/open>.
-The warning will also occur if STDOUT (file descriptor 1) or STDERR
-(file descriptor 2) is opened for input, this is a pre-emptive warning in
-case some other part of your program or a child process is expecting STDOUT
-and STDERR to be writable. This can happen accidentally if you
-C<close(STDOUT)> or STDERR and then C<open> an unrelated handle which
-will resuse the lowest numbered available descriptor.
 
 =item Filehandle %s opened only for output
 
@@ -1498,12 +1492,17 @@ will resuse the lowest numbered available descriptor.
 If you intended it to be a read/write filehandle, you needed to open it
 with "+<" or "+>" or "+>>" instead of with "<" or nothing.  If you
 intended only to read from the file, use "<".  See L<perlfunc/open>.
-The warning will also occur if STDIN (file descriptor 0) is opened
-for output - this is a pre-emptive warning in case some other part of your
-program or a child process is expecting STDIN to be readable.
-This can happen accidentally if you C<close(STDIN)> and then C<open> an
-unrelated handle which will resuse the lowest numbered available
-descriptor.
+
+=item Filehandle %s reopened as %s only for input
+
+(W io) You opened for reading a filehandle that got the same filehandle id
+as STDOUT or STDERR. This occured because you closed STDOUT or STDERR
+previously.
+
+=item Filehandle STDIN reopened as %s only for output
+
+(W io) You opened for writing a filehandle that got the same filehandle id
+as STDIN. This occured because you closed STDIN previously.
 
 =item Final $ should be \$ or $name
 
diff --git a/t/lib/warnings/doio b/t/lib/warnings/doio
index bb09aa8..15d4c5e 100644
--- a/t/lib/warnings/doio
+++ b/t/lib/warnings/doio
@@ -275,3 +275,42 @@ no warnings 'io';
 open FOO, '>', \$x;
 EXPECT
 Can't open a reference at - line 14.
+########
+# doio.c [Perl_do_openn]
+use Config;
+BEGIN {
+    if (!$Config{useperlio}) {
+	print <<EOM;
+SKIPPED
+# warns only with perlio
+EOM
+	exit;
+    }
+}
+use warnings 'io' ;
+close STDOUT;
+open FH1, "harness"; close FH1;
+no warnings 'io' ;
+open FH2, "harness"; close FH2;
+EXPECT
+Filehandle STDOUT reopened as FH1 only for input at - line 14.
+########
+# doio.c [Perl_do_openn]
+use Config;
+BEGIN {
+    if (!$Config{useperlio}) {
+	print <<EOM;
+SKIPPED
+# warns only with perlio
+EOM
+	exit;
+    }
+}
+use warnings 'io' ;
+close STDIN;
+open my $fh1, ">doiowarn.tmp"; close $fh1;
+no warnings 'io' ;
+open my $fh2, ">doiowarn.tmp"; close $fh2;
+unlink "doiowarn.tmp";
+EXPECT
+Filehandle STDIN reopened as $fh1 only for output at - line 14.
-- 
1.8.3.1