From 0f1b18abb46844c01accf8cd0a698ea419fb3ee6 Mon Sep 17 00:00:00 2001
From: Jan Kratochvil <jan.kratochvil@redhat.com>
Date: Sun, 3 Feb 2013 16:27:57 +0000
Subject: [PATCH] gdb/ 	* contrib/expect-read1.c: New file. 	*
 contrib/expect-read1.sh: New file.

---
 gdb/ChangeLog               |  5 +++++
 gdb/contrib/expect-read1.c  | 40 +++++++++++++++++++++++++++++++++++
 gdb/contrib/expect-read1.sh | 42 +++++++++++++++++++++++++++++++++++++
 3 files changed, 87 insertions(+)
 create mode 100644 gdb/contrib/expect-read1.c
 create mode 100644 gdb/contrib/expect-read1.sh

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index a7f2e0c345e..c8ee3312fa5 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2013-02-03  Jan Kratochvil  <jan.kratochvil@redhat.com>
+
+	* contrib/expect-read1.c: New file.
+	* contrib/expect-read1.sh: New file.
+
 2013-02-03  Jan Kratochvil  <jan.kratochvil@redhat.com>
 
 	* dwarf2read.c (file_file_name): New function with code from
diff --git a/gdb/contrib/expect-read1.c b/gdb/contrib/expect-read1.c
new file mode 100644
index 00000000000..963c1ffab93
--- /dev/null
+++ b/gdb/contrib/expect-read1.c
@@ -0,0 +1,40 @@
+/* Copyright (C) 2013 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* RTLD_NEXT requires _GNU_SOURCE.  */
+#define _GNU_SOURCE 1
+#include <dlfcn.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdlib.h>
+
+ssize_t
+read (int fd, void *buf, size_t count)
+{
+  static ssize_t (*read2) (int fd, void *buf, size_t count) = NULL;
+
+  if (read2 == NULL)
+    {
+      unsetenv ("LD_PRELOAD");
+      read2 = dlsym (RTLD_NEXT, "read");
+    }
+
+  if (count > 1 && isatty (fd) == 1)
+    count = 1;
+
+  return read2 (fd, buf, count);
+}
diff --git a/gdb/contrib/expect-read1.sh b/gdb/contrib/expect-read1.sh
new file mode 100644
index 00000000000..ad325202f63
--- /dev/null
+++ b/gdb/contrib/expect-read1.sh
@@ -0,0 +1,42 @@
+#! /bin/sh
+# runtest wrapper to reliably reproduce racy incomplete reads in the testsuite.
+
+# Copyright (C) 2013 Free Software Foundation, Inc.
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# This tool excercise any incomplete reads handling in the testsuite by
+# simulating read always returns just 1 character.
+# Testsuite incompatibilities are tracked as GDB PR testsuite/12649.
+
+# Example usage:
+#
+# bash$ cd $objdir/gdb/testsuite
+# bash$ EXPECT=$srcdir/gdb/contrib/expect-read1.sh runtest
+# or
+# bash$ EXPECT=../contrib/expect-read1.sh runtest
+
+C=`echo $0|sed 's/\.sh$/.c/'`
+if ! test -e $C; then
+  echo >&2 "$0: Cannot find 'srcdir/gdb/contrib/expect-read1.c' at '$C'."
+  exit 2
+fi
+SO=/tmp/expect-read1.$$.so
+rm -f $SO
+CMD="${CC_FOR_TARGET:-gcc} -o $SO -Wall -fPIC -shared $C"
+if ! $CMD; then
+  echo >&2 "$0: Failed: $CMD"
+  exit 2
+fi
+trap "rm -f $SO" EXIT
+LD_PRELOAD=$SO expect "$@"
-- 
2.30.2