1 /*
2 * Copyright (c) 2002, Intel Corporation. All rights reserved.
3 * Created by: julie.n.fleischer REMOVE-THIS AT intel DOT com
4 * This file is licensed under the GPL license. For the full content
5 * of this license, see the COPYING file at the top level of this
6 * source tree.
7 *
8 * Test that clock_settime() does not affect clock_nanosleep()
9 * relative timers expiration times.
10 *
11 * Steps:
12 * - get time T0
13 * - in child: set clock_nanosleep() to sleep for SLEEPSEC seconds
14 * - in parent: sleep SMALLTIME (< SLEEPSEC)
15 * - in parent: set time back to T0
16 * - in child: ensure time when clock_nanosleep() expires is within
17 * ACCEPTABLEDELTA of T0+(SLEEPSEC-SMALLTIME)
18 */
19 #include <stdio.h>
20 #include <time.h>
21 #include <signal.h>
22 #include <unistd.h>
23 #include <sys/wait.h>
24 #include "posixtest.h"
25 #include "helpers.h"
26
27 #define SLEEPSEC 5
28 #define SMALLTIME 2
29 #define ACCEPTABLEDELTA 1
30
31 #define CHILDPASS 1
32 #define CHILDFAIL 0
33
main(void)34 int main(void)
35 {
36 struct timespec tsT0, tssleep;
37 int pid;
38
39 /* Check that we're root...can't call clock_settime with CLOCK_REALTIME otherwise */
40 if (getuid() != 0) {
41 printf("Run this test as ROOT, not as a Regular User\n");
42 return PTS_UNTESTED;
43 }
44
45 if (clock_gettime(CLOCK_REALTIME, &tsT0) != 0) {
46 perror("clock_gettime() did not return success\n");
47 return PTS_UNRESOLVED;
48 }
49
50 if ((pid = fork()) == 0) {
51 /* child here */
52 struct timespec tsend;
53 time_t expectedsec;
54
55 tssleep.tv_sec = SLEEPSEC;
56 tssleep.tv_nsec = 0;
57
58 if (clock_nanosleep(CLOCK_REALTIME, 0, &tssleep, NULL) != 0) {
59 printf("clock_nanosleep() did not return success\n");
60 return CHILDFAIL;
61 }
62
63 if (clock_gettime(CLOCK_REALTIME, &tsend) != 0) {
64 perror("clock_gettime() did not return success\n");
65 return CHILDFAIL;
66 }
67
68 expectedsec = tsT0.tv_sec + (SLEEPSEC - SMALLTIME);
69
70 if (tsend.tv_sec >= expectedsec) {
71 if ((tsend.tv_sec - expectedsec) <= ACCEPTABLEDELTA) {
72 return CHILDPASS;
73 } else {
74 printf("Ended too late. %d >> %d\n",
75 (int)tsend.tv_sec, (int)expectedsec);
76 return CHILDFAIL;
77 }
78 } else {
79 printf("Did not sleep for long enough %d < %d\n",
80 (int)tsend.tv_sec, (int)expectedsec);
81 return CHILDFAIL;
82 }
83
84 return CHILDFAIL;
85 } else {
86 /* parent here */
87 int i;
88 struct timespec tsreset;
89
90 sleep(SMALLTIME);
91
92 if (clock_settime(CLOCK_REALTIME, &tsT0) != 0) {
93 printf("clock_settime() did not return success\n");
94 return PTS_UNRESOLVED;
95 }
96
97 if (wait(&i) == -1) {
98 perror("Error waiting for child to exit\n");
99 return PTS_UNRESOLVED;
100 }
101
102 getBeforeTime(&tsreset); // get current time
103 tsreset.tv_sec += SMALLTIME;
104 setBackTime(tsreset);
105
106 if (WIFEXITED(i) && WEXITSTATUS(i)) {
107 printf("Test PASSED\n");
108 return PTS_PASS;
109 } else {
110 printf("Test FAILED\n");
111 return PTS_FAIL;
112 }
113 }
114
115 return PTS_UNRESOLVED;
116 }
117