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From 8a2562bec7cd9f8eff6812f340f99dddd028bb33 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Petr=20P=C3=ADsa=C5=99?= <ppisar@redhat.com>
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Date: Thu, 6 Aug 2020 10:51:56 +0200
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Subject: [PATCH] IO::Handle: Fix a spurious error reported for regular file
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handles
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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89341f87 fix for GH #6799 introduced a regression when calling error()
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on an IO::Handle object that was opened for reading a regular file:
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$ perl -e 'open my $f, q{<}, q{/etc/hosts} or die; print qq{error\n} if $f->error'
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error
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In case of a regular file opened for reading, IoOFP() returns NULL and
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PerlIO_error(NULL) reports -1. Compare to the case of a file opened
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for writing when both IoIFP() and IoOFP() return non-NULL, equaled
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pointer.
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This patch fixes handling the case of the NULL output stream.
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GH #18019
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Signed-off-by: Petr Písař <ppisar@redhat.com>
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---
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dist/IO/IO.xs | 4 ++--
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dist/IO/t/io_xs.t | 10 +++++++++-
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2 files changed, 11 insertions(+), 3 deletions(-)
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diff --git a/dist/IO/IO.xs b/dist/IO/IO.xs
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index 9158106416..fb009774c4 100644
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--- a/dist/IO/IO.xs
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+++ b/dist/IO/IO.xs
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@@ -397,9 +397,9 @@ ferror(handle)
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CODE:
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if (in)
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#ifdef PerlIO
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- RETVAL = PerlIO_error(in) || (in != out && PerlIO_error(out));
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+ RETVAL = PerlIO_error(in) || (out && in != out && PerlIO_error(out));
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#else
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- RETVAL = ferror(in) || (in != out && ferror(out));
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+ RETVAL = ferror(in) || (out && in != out && ferror(out));
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#endif
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else {
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RETVAL = -1;
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diff --git a/dist/IO/t/io_xs.t b/dist/IO/t/io_xs.t
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index a8833b0651..4657088629 100644
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--- a/dist/IO/t/io_xs.t
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+++ b/dist/IO/t/io_xs.t
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@@ -11,7 +11,7 @@ BEGIN {
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}
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}
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-use Test::More tests => 8;
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+use Test::More tests => 10;
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use IO::File;
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use IO::Seekable;
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@@ -69,3 +69,11 @@ SKIP: {
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ok(!$fh->error, "check clearerr removed the error");
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close $fh; # silently ignore the error
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}
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+
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+{
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+ # [GH #18019] IO::Handle->error misreported an error after successully
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+ # opening a regular file for reading. It was a regression in GH #6799 fix.
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+ ok(open(my $fh, '<', __FILE__), "a regular file opened for reading");
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+ ok(!$fh->error, "no spurious error reported by error()");
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+ close $fh;
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+}
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--
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2.25.4
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