gettimeofday

Function Usage

Obtains the current system time and returns the number of seconds and microseconds since January 1, 1970. This function is used to obtain high-precision timestamps.

Function Syntax

int gettimeofday(struct timeval *tv, struct timezone *tz);

Parameters

Return Value

• Success: 0 is returned.
• Failure: See those of open source glibc. No other exception values will be returned.

The precision of the time obtained using gettimeofday is microseconds.

Example

#include <stdio.h>
#include <sys/time.h>
#include <time.h>

int main() {
    struct timeval tv;
    struct timezone *tz;
    int seconds;
    float micros;
    tz = NULL;
    gettimeofday(&tv, tz);
    seconds = tv.tv_sec;
    micros = tv.tv_usec;
  
    printf("Current_time (seconds): %ld\n", seconds);
    double timestamp = seconds + micros / 1.0e6;
    printf("High-precision_timestamp (seconds and microseconds): %f\n", timestamp);
    return 0;
}

Output:

Output:
Current time (seconds): ***
High-precision timestamp (seconds and microseconds): ***