tests: check that strace does not retain stdin and stdout descriptors

* tests/redirect.test: New test.
* tests/Makefile.am (TESTS): Add it.

tests/Makefile.am

@@ -312,6 +312,7 @@ TESTS = \
 	detach-stopped.test \
 	detach-running.test \
 	opipe.test \
+	redirect.test \
 	restart_syscall.test \
 	$(LIBUNWIND_TESTS)
 

tests/redirect.test

@@ -0,0 +1,67 @@
+#!/bin/sh
+#
+# Ensure that strace does not retain stdin and stdout descriptors.
+#
+# Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+# 3. The name of the author may not be used to endorse or promote products
+#    derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+. "${srcdir=.}/init.sh"
+
+run_prog_skip_if_failed \
+	kill -0 $$
+
+check_prog sleep
+check_prog yes
+
+> "$LOG"
+
+(
+	$SLEEP_A_BIT &
+	yes
+	if kill -0 $! 2> /dev/null; then
+		wait
+	else
+		echo TIMEOUT >> $LOG
+	fi
+) | $STRACE -o/dev/null sh -c "exec <&- >&-; $SLEEP_A_BIT; $SLEEP_A_BIT"
+
+if [ -s "$LOG" ]; then
+	fail_ "$STRACE failed to redirect standard input"
+fi
+
+$STRACE -o/dev/null sh -c "exec <&- >&-; $SLEEP_A_BIT; $SLEEP_A_BIT" |
+(
+	$SLEEP_A_BIT &
+	cat > /dev/null
+	if kill -0 $! 2> /dev/null; then
+		wait
+	else
+		echo TIMEOUT >> $LOG
+	fi
+)
+
+if [ -s "$LOG" ]; then
+	fail_ "$STRACE failed to redirect standard output"
+fi