My code suddenly not working anymore today, what could be the issue? Here is the part of the code.

struct timespec tp;
clock_gettime(CLOCK_MONOTONIC, &tp);
int32_t tnow = tp.tv_sec * 1000   tp.tv_nsec / 1000000;

if (tnow - decoder->last_dumped >= 300) {
    decoder->last_dumped = tnow;
    // it was working before
    ...
}

CodePudding user response：

tv_sec is a signed integer holding seconds, so 1000 * tv_sec will overflow an int32_t. Use int64_t.

Overflow will occur after (1 << 31) milliseconds, which is about 24.8 days.