tests: check success injection

* tests/fault_injection-retval.c: New file.
* tests/fault_injection-retval.test: New test.
* tests/.gitignore: Add fault_injection-retval.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(MISC_TESTS): Add fault_injection-retval.test.

tests/.gitignore

@@ -56,6 +56,7 @@ fallocate
 fanotify_init
 fanotify_mark
 fault_injection
+fault_injection-retval
 fchdir
 fchmod
 fchmodat

tests/Makefile.am

@@ -117,6 +117,7 @@ check_PROGRAMS = \
 	fanotify_init \
 	fanotify_mark \
 	fault_injection \
+	fault_injection-retval \
 	fchdir \
 	fchmod \
 	fchmodat \
@@ -836,6 +837,7 @@ MISC_TESTS = \
 	detach-running.test \
 	detach-sleeping.test \
 	detach-stopped.test \
+	fault_injection-retval.test \
 	fault_injection.test \
 	fault_syntax.test \
 	filter-unavailable.test \

tests/fault_injection-retval.c

@@ -0,0 +1,73 @@
+/*
+ * Check success injection.
+ *
+ * Copyright (c) 2017 Elvira Khabirova <lineprinter0@gmail.com>
+ * 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.
+ */
+
+#include "tests.h"
+#include <asm/unistd.h>
+
+#ifdef __NR_chdir
+
+# include <assert.h>
+# include <stdio.h>
+# include <stdlib.h>
+# include <unistd.h>
+# include <sys/stat.h>
+
+int
+main(int argc, char *argv[])
+{
+	assert(argc == 2);
+
+	static const char dir[] = "..";
+	struct stat before, after;
+
+	if (stat(".", &before))
+		perror_msg_and_fail("stat");
+
+	long rval = syscall(__NR_chdir, dir);
+
+	if (stat(".", &after))
+		perror_msg_and_fail("stat");
+
+	if (before.st_dev != after.st_dev || before.st_ino != after.st_ino)
+		error_msg_and_fail("syscall succeeded");
+	if (atol(argv[1]) != rval)
+		error_msg_and_fail("expected retval %s, got retval %ld",
+				   argv[1], rval);
+
+	printf("chdir(\"%s\") = %ld (INJECTED)\n", dir, rval);
+
+	puts("+++ exited with 0 +++");
+	return 0;
+}
+
+#else
+
+SKIP_MAIN_UNDEFINED("__NR_chdir")
+
+#endif

tests/fault_injection-retval.test

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+# Check success injection.
+
+. "${srcdir=.}/fault_injection.sh"
+
+check_injection()
+{
+	local syscall rval
+
+	syscall=chdir
+	rval="$1"; shift
+
+	run_strace -a12 -e$syscall -efault="$syscall:retval=$rval" "$@" \
+		./fault_injection-retval "$rval" > "$EXP"
+	match_diff "$LOG" "$EXP"
+	rm -f "$EXP"
+}
+
+check_injection 0
+check_injection 42