kaguya
65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdint.h>
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#include <sys/time.h>
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#include <sys/timerfd.h>
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#include <unistd.h>
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int main() {
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int t = timerfd_create(CLOCK_MONOTONIC, 0);
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assert(t > 0);
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struct itimerspec its;
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int ret = timerfd_gettime(t, &its);
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assert(ret == 0);
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assert(!its.it_value.tv_sec);
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assert(!its.it_value.tv_nsec);
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assert(!its.it_interval.tv_sec);
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assert(!its.it_interval.tv_nsec);
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struct itimerspec new_its = {
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.it_interval = {0, 0},
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.it_value = {0, 100000000},
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};
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ret = timerfd_settime(t, 0, &new_its, &its);
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assert(ret == 0);
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assert(!its.it_value.tv_sec);
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assert(!its.it_value.tv_nsec);
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assert(!its.it_interval.tv_sec);
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assert(!its.it_interval.tv_nsec);
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ret = timerfd_gettime(t, &its);
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assert(ret == 0);
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assert(!its.it_value.tv_sec);
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assert(its.it_value.tv_nsec);
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assert(!its.it_interval.tv_sec);
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assert(!its.it_interval.tv_nsec);
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struct timeval before;
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gettimeofday(&before, NULL);
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assert(ret == 0);
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uint64_t ev = 0;
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ret = read(t, &ev, sizeof(ev));
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struct timeval after;
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gettimeofday(&after, NULL);
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assert(ret == sizeof(ev));
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assert(ev == 1);
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struct timeval diff = {};
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timersub(&after, &before, &diff);
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assert(diff.tv_sec || diff.tv_usec);
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fcntl(t, F_SETFL, fcntl(t, F_GETFL, 0) | O_NONBLOCK);
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ret = timerfd_settime(t, 0, &new_its, &its);
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assert(ret == 0);
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ret = read(t, &ev, sizeof(ev));
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assert(ret == -1);
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assert(errno == EAGAIN);
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return 0;
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}
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