tests: check decoding of ioprio_get and ioprio_set syscalls

* tests/ioprio.c: New file.
* tests/ioprio.test: New test.
* tests/.gitignore: Add ioprio.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(DECODER_TESTS): Add ioprio.test.

tests/.gitignore

@@ -112,6 +112,7 @@ ioctl_uffdio
 ioctl_v4l2
 ioperm
 iopl
+ioprio
 ip_mreq
 ipc
 ipc_msg

tests/Makefile.am

@@ -172,6 +172,7 @@ check_PROGRAMS = \
 	ioctl_v4l2 \
 	ioperm \
 	iopl \
+	ioprio \
 	ip_mreq \
 	ipc \
 	ipc_msg \
@@ -517,6 +518,7 @@ DECODER_TESTS = \
 	ioctl_v4l2.test \
 	ioperm.test \
 	iopl.test \
+	ioprio.test \
 	ip_mreq.test \
 	ipc.test \
 	ipc_msg.test \

tests/ioprio.c

@@ -0,0 +1,104 @@
+/*
+ * Check decoding of ioprio_get and ioprio_set syscalls.
+ *
+ * Copyright (c) 2016 Eugene Syromyatnikov <evgsyr@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>
+
+#if defined(__NR_ioprio_get) && defined(__NR_ioprio_set)
+
+# include <stdio.h>
+# include <unistd.h>
+
+# include "kernel_types.h"
+
+enum {
+	IOPRIO_CLASS_NONE,
+	IOPRIO_CLASS_RT,
+	IOPRIO_CLASS_BE,
+	IOPRIO_CLASS_IDLE
+};
+
+# include "xlat.h"
+# include "xlat/ioprio_class.h"
+
+void
+print_ioprio(unsigned long val)
+{
+	printf(" (IOPRIO_PRIO_VALUE(");
+	printxval(ioprio_class, val >> 13, "IOPRIO_CLASS_???");
+	printf(", %d))", (int) (val & 0x1fff));
+}
+
+int
+main(void)
+{
+	static const kernel_ulong_t bogus_which =
+		(kernel_ulong_t) 0xdeadfacefa57beefULL;
+	static const kernel_ulong_t bogus_who =
+		(kernel_ulong_t) 0xbadc0dedda7a1057ULL;
+	static const kernel_ulong_t bogus_ioprio =
+		(kernel_ulong_t) 0xdec0ded1facefeedULL;
+	static const char * const bogus_ioprio_str =
+		"IOPRIO_PRIO_VALUE(0x7d677 /* IOPRIO_CLASS_??? */, 7917)";
+
+	long rc;
+
+	rc = syscall(__NR_ioprio_get, bogus_which, bogus_who);
+	printf("ioprio_get(%#x /* IOPRIO_WHO_??? */, %d) = %s\n",
+	       (int) bogus_which, (int) bogus_who, sprintrc(rc));
+
+	rc = syscall(__NR_ioprio_get, 1, 0);
+	printf("ioprio_get(IOPRIO_WHO_PROCESS, 0) = %s", sprintrc(rc));
+
+	if (rc >= -1)
+		print_ioprio(rc);
+
+	puts("");
+
+	rc = syscall(__NR_ioprio_set, 2, 0, 8191);
+	printf("ioprio_set(IOPRIO_WHO_PGRP, 0, "
+	       "IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, 8191)) = %s\n",
+	       sprintrc(rc));
+
+	rc = syscall(__NR_ioprio_set, bogus_which, bogus_who, bogus_ioprio);
+	printf("ioprio_set(%#x /* IOPRIO_WHO_??? */, %d, %s) = %s\n",
+	       (int) bogus_which, (int) bogus_who, bogus_ioprio_str,
+	       sprintrc(rc));
+
+	puts("+++ exited with 0 +++");
+
+	return 0;
+}
+
+#else
+
+SKIP_MAIN_UNDEFINED("__NR_ioprio_get && __NR_ioprio_set");
+
+#endif

tests/ioprio.test

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+# Check iprio_get and iprio_set syscalls decoding.
+
+. "${srcdir=.}/init.sh"
+run_strace_match_diff -a18 -e trace=ioprio_get,ioprio_set