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48 lines
1.5 KiB
48 lines
1.5 KiB
#include <dlfcn.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <stdlib.h>
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static inline long long timeval_us(const struct timeval *t) {
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return (long long) ((long long) t->tv_sec * 1000000LL) + t->tv_usec;
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}
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static inline void timeval_from_us(struct timeval *t, long long us) {
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t->tv_sec = us/1000000LL;
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t->tv_usec = us%1000000LL;
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}
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static inline long long timespec_ns(const struct timespec *t) {
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return (long long) ((long long) t->tv_sec * 1000000000LL) + t->tv_nsec;
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}
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static inline void timespec_from_ns(struct timespec *t, long long ns) {
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t->tv_sec = ns/1000000000LL;
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t->tv_nsec = ns%1000000000LL;
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}
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static long long offset = 0;
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int gettimeofday(struct timeval *restrict tv, void *restrict tz) {
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__typeof__ (gettimeofday) *fn = dlsym(RTLD_NEXT, "gettimeofday");
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int ret = fn(tv, tz);
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if (ret)
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return ret;
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long r = random();
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if (r < ((1L<<31) / 100)) {
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// 1% chance
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long long add = random() & 0xffff;
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offset += add;
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fprintf(stderr, "moving clock forward by %lli us\n", add);
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}
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long long tvs = timeval_us(tv);
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tvs += offset;
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timeval_from_us(tv, tvs);
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return ret;
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}
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int pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex, const struct timespec *abstime) {
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__typeof__ (pthread_cond_timedwait) *fn = dlsym(RTLD_NEXT, "pthread_cond_timedwait");
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if (!abstime)
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return fn(cond, mutex, abstime);
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struct timespec tn;
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long long ns = timespec_ns(abstime);
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ns -= offset * 1000LL;
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timespec_from_ns(&tn, ns);
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return fn(cond, mutex, &tn);
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}
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