1 /*
2 * Copyright (c) International Business Machines Corp., 2001
3 * 07/2001 Ported by Wayne Boyer
4 * Copyright (c) 2016 Cyril Hrubis <chrubis@suse.cz>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
14 * the GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /*
22 * Verify that root can provide a negative value to nice()
23 * and hence root can decrease the nice value of the process
24 * using nice() system call
25 */
26 #include <unistd.h>
27 #include <errno.h>
28 #include <sys/resource.h>
29 #include "tst_test.h"
30
31 #define NICEINC -12
32
verify_nice(void)33 static void verify_nice(void)
34 {
35 int new_nice;
36 int orig_nice;
37
38 orig_nice = SAFE_GETPRIORITY(PRIO_PROCESS, 0);
39
40 TEST(nice(NICEINC));
41
42 if (TST_RET != (orig_nice + NICEINC)) {
43 tst_res(TFAIL | TTERRNO, "nice(%d) returned %li, expected %i",
44 NICEINC, TST_RET, orig_nice + NICEINC);
45 return;
46 }
47
48 if (TST_ERR) {
49 tst_res(TFAIL | TTERRNO, "nice(%d) failed", NICEINC);
50 return;
51 }
52
53 new_nice = SAFE_GETPRIORITY(PRIO_PROCESS, 0);
54
55 if (new_nice != (orig_nice + NICEINC)) {
56 tst_res(TFAIL, "Process priority %i, expected %i",
57 new_nice, orig_nice + NICEINC);
58 return;
59 }
60
61 tst_res(TPASS, "nice(%d) passed", NICEINC);
62
63 TEST(nice(-NICEINC));
64 if (TST_ERR)
65 tst_brk(TBROK | TERRNO, "nice(-NICEINC) failed");
66 }
67
68 static struct tst_test test = {
69 .test_all = verify_nice,
70 .needs_root = 1,
71 };
72