time - Get a timestamp in C in microseconds? -

how microseconds timestamp in c?

i'm trying do:

struct timeval tv; gettimeofday(&tv,null); return tv.tv_usec; 

but returns nonsense value if 2 timestamps, second 1 can smaller or bigger first (second 1 should always bigger). possible convert magic integer returned gettimeofday normal number can worked with?

you need add in seconds, too:

unsigned long time_in_micros = 1000000 * tv.tv_sec + tv.tv_usec; 

note last 2³²/10⁶ =~ 4295 seconds, or 71 minutes though (on typical 32-bit system).