1 /* Copyright 2022, Google Inc. All rights reserved.
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16 *
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21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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28 */
29
30 #include "test_skel.h"
31
main(int argc,char * argv[])32 int main(int argc, char *argv[]) {
33 // We need an invalid timer value. The assert()'s below should
34 // be static asserts but it is not avalible in older C versions.
35 #define kInvalidTimer 9999
36 assert(kInvalidTimer != ITIMER_REAL);
37 assert(kInvalidTimer != ITIMER_VIRTUAL);
38 assert(kInvalidTimer != ITIMER_PROF);
39
40 // Invalid timer returns EINVAL.
41 assert(sys_setitimer(kInvalidTimer, NULL, NULL) == -1);
42 assert(errno == EINVAL);
43
44 const int kSignal = SIGALRM;
45 const size_t kSigsetSize = sizeof(struct kernel_sigset_t);
46
47 // Block SIGALRM.
48 struct kernel_sigset_t sigalarm_only;
49 struct kernel_sigset_t old_sigset;
50 assert(sys_sigemptyset(&sigalarm_only) == 0);
51 assert(sys_sigaddset(&sigalarm_only, kSignal) == 0);
52 assert(sys_rt_sigprocmask(SIG_BLOCK, &sigalarm_only, &old_sigset,
53 kSigsetSize) == 0);
54
55 // Set up a real time timer.
56 struct kernel_itimerval new_itimer = {};
57 const long kIntervalUSec = 123;
58 new_itimer.it_interval.tv_sec = 0;
59 new_itimer.it_interval.tv_usec = kIntervalUSec;
60 new_itimer.it_value = new_itimer.it_interval;
61 assert(sys_setitimer(ITIMER_REAL, &new_itimer, NULL) == 0);
62
63 // Wait for alarm.
64 struct timespec timeout;
65 const unsigned long kNanoSecsPerSec = 1000000000;
66 const unsigned long kNanoSecsPerMicroSec = 1000;
67
68 // Use a timeout 3 times of the timer interval.
69 unsigned long duration_ns = kIntervalUSec * kNanoSecsPerMicroSec * 3;
70 timeout.tv_sec = duration_ns / kNanoSecsPerSec ;
71 timeout.tv_nsec = duration_ns % kNanoSecsPerSec;
72
73 int sig;
74 do {
75 sig = sys_sigtimedwait(&sigalarm_only, NULL, &timeout);
76 } while (sig == -1 && errno == EINTR);
77 assert(sig == kSignal);
78
79 // Disable timer, check saving of old timer value.
80 struct kernel_itimerval empty_itimer = {};
81 struct kernel_itimerval old_itimer;
82 empty_itimer.it_interval.tv_sec = 0;
83 empty_itimer.it_interval.tv_usec = 0;
84 empty_itimer.it_value = empty_itimer.it_interval;
85
86 assert(sys_setitimer(ITIMER_REAL, &empty_itimer, &old_itimer) == 0);
87 assert(kernel_timeval_eq(&old_itimer.it_interval, &new_itimer.it_interval));
88
89 return 0;
90 }
91