1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) International Business Machines Corp., 2001
4 * Ported to LTP: Wayne Boyer
5 * Copyright (c) 2016 Cyril Hrubis <[email protected]>
6 */
7
8 /*\
9 * [Description]
10 *
11 * Verify that any user can successfully increase the nice value of
12 * the process by passing an increment value (< max. applicable limits) to
13 * nice() system call.
14 */
15 #include <unistd.h>
16 #include <stdlib.h>
17 #include <errno.h>
18 #include <sys/resource.h>
19 #include "tst_test.h"
20
21 #define NICEINC 2
22 #define MAX_PRIO 19
23
nice_test(void)24 static void nice_test(void)
25 {
26 int new_nice;
27 int orig_nice;
28 int exp_nice;
29
30 orig_nice = SAFE_GETPRIORITY(PRIO_PROCESS, 0);
31
32 TEST(nice(NICEINC));
33
34 if (TST_RET == -1) {
35 tst_res(TFAIL | TTERRNO, "nice(%d) returned -1", NICEINC);
36 return;
37 }
38
39 if (TST_ERR) {
40 tst_res(TFAIL | TTERRNO, "nice(%d) failed", NICEINC);
41 return;
42 }
43
44 new_nice = SAFE_GETPRIORITY(PRIO_PROCESS, 0);
45 exp_nice = MIN(MAX_PRIO, (orig_nice + NICEINC));
46
47 if (new_nice != exp_nice) {
48 tst_res(TFAIL, "Process priority %i, expected %i",
49 new_nice, exp_nice);
50 return;
51 }
52
53 tst_res(TPASS, "nice(%d) passed", NICEINC);
54
55 exit(0);
56 }
57
verify_nice(void)58 static void verify_nice(void)
59 {
60 if (!SAFE_FORK())
61 nice_test();
62
63 tst_reap_children();
64 }
65
66 static struct tst_test test = {
67 .forks_child = 1,
68 .test_all = verify_nice,
69 };
70