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Fake the clock_nanosleep syscall

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Balint Reczey
2025-11-08 12:40:49 +01:00
parent 949b36e6a2
commit 3109728f45
3 changed files with 116 additions and 0 deletions
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32
test/snippets/syscall_clock_nanosleep.c Normal file
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/* Test raw syscall(__NR_clock_nanosleep): relative and TIMER_ABSTIME */
#ifdef __NR_clock_nanosleep
struct timespec start_fake, end_fake_rel, end_fake_abs;
struct timespec req_rel = {0, 200 * 1000 * 1000}; /* 200ms fake sleep */
struct timespec req_abs;
long ret;
/* Capture starting time (fake view) */
clock_gettime(CLOCK_REALTIME, &start_fake);
/* Relative sleep via syscall */
ret = syscall(__NR_clock_nanosleep, CLOCK_REALTIME, 0, &req_rel, NULL);
clock_gettime(CLOCK_REALTIME, &end_fake_rel);
/* Absolute sleep target: 300ms after start_fake *./test_variable_data.sh */
req_abs.tv_sec = start_fake.tv_sec;
req_abs.tv_nsec = start_fake.tv_nsec + 300 * 1000 * 1000;
if (req_abs.tv_nsec >= 1000000000) { req_abs.tv_sec += 1; req_abs.tv_nsec -= 1000000000; }
/* Absolute sleep via syscall */
ret = syscall(__NR_clock_nanosleep, CLOCK_REALTIME, TIMER_ABSTIME, &req_abs, NULL);
clock_gettime(CLOCK_REALTIME, &end_fake_abs);
/* Report durations (fake view). */
long rel_ns = (end_fake_rel.tv_sec - start_fake.tv_sec) * 1000000000L + (end_fake_rel.tv_nsec - start_fake.tv_nsec);
long abs_ns = (end_fake_abs.tv_sec - start_fake.tv_sec) * 1000000000L + (end_fake_abs.tv_nsec - start_fake.tv_nsec);
printf("[%s] syscall(clock_nanosleep) relative 200ms -> ~%ld ns, absolute +300ms -> ~%ld ns\n", where, rel_ns, abs_ns);
return ret;
#else
printf("[%s] __NR_clock_nanosleep not defined on this platform\n", where);
#endif

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test/snippets/syscall_clock_nanosleep.variable Normal file
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FAKETIME 2020-01-01 00:00:00