1 /*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License version 2.
4 *
5 * This program is distributed in the hope that it will be useful,
6 * but WITHOUT ANY WARRANTY; without even the implied warranty of
7 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
8 * GNU General Public License for more details.
9 *
10 *
11 * Test that the scheduling policy and scheduling parameters are set for
12 * the calling process when pid == 0.
13 */
14 #include <sched.h>
15 #include <stdio.h>
16 #include <errno.h>
17 #include <unistd.h>
18 #include "posixtest.h"
19
main(void)20 int main(void)
21 {
22 int result, new_priority, old_priority, max_prio;
23 int old_policy, new_policy, test_policy;
24 struct sched_param param;
25
26 if (sched_getparam(getpid(), ¶m) != 0) {
27 perror("An error occurs when calling sched_getparam()");
28 return PTS_UNRESOLVED;
29 }
30
31 old_policy = sched_getscheduler(getpid());
32 if (old_policy == -1) {
33 perror("An error occurs when calling sched_getscheduler()");
34 return PTS_UNRESOLVED;
35 }
36
37 /* Make sure new_policy != old_policy */
38 new_policy = (old_policy == SCHED_FIFO) ? SCHED_RR : SCHED_FIFO;
39
40 /* Make sure new_priority != old_priority */
41 max_prio = sched_get_priority_max(new_policy);
42 old_priority = param.sched_priority;
43 new_priority = (old_priority == max_prio) ?
44 (param.sched_priority = sched_get_priority_min(new_policy)) :
45 (param.sched_priority = max_prio);
46
47 result = sched_setscheduler(0, new_policy, ¶m);
48
49 if (sched_getparam(getpid(), ¶m) != 0) {
50 perror("An error occurs when calling sched_getparam()");
51 return PTS_UNRESOLVED;
52 }
53
54 test_policy = sched_getscheduler(getpid());
55 if (test_policy == -1) {
56 perror("An error occurs when calling sched_getscheduler()");
57 return PTS_UNRESOLVED;
58 }
59
60 if (result != -1 && param.sched_priority == new_priority &&
61 test_policy == new_policy) {
62 printf("Test PASSED\n");
63 return PTS_PASS;
64 } else if (result != -1 &&
65 (param.sched_priority == old_priority ||
66 test_policy == old_policy)) {
67 if (param.sched_priority == old_priority) {
68 printf("The param does not change\n");
69 }
70 if (test_policy == old_policy) {
71 printf("The policy does not change\n");
72 }
73 return PTS_FAIL;
74 } else if (result == -1 && errno == EPERM) {
75 printf
76 ("The process have not permission to change its own policy.\nTry to launch this test as root.\n");
77 return PTS_UNRESOLVED;
78 }
79
80 perror("Unknow error");
81 return PTS_FAIL;
82 }
83