Find CPU times and system times of process in linux - process

Question

I have a main program that creates two children and each children calls execlv. At the end of the program how do I calculate the CPU times and system times of the parent and two process?
#include <sys/types.h>
#include <sys/wait.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <signal.h>
int main()
{
pid_t pid1,pid2,wid; // variable for parent and two children
char *my_args[3]; // strign array for containing the arguments for executing sigShooter1
// int aInt = 368; //
char str[15]; // strign to contain the pids of children when passing as command line arguments
pid1 = fork();
if (pid1 < 0)
{
fprintf(stderr, ": fork failed: %s\n", strerror(errno));
exit(1);
}
if(pid1 == 0)
{
my_args[0] = "sigperf1";
my_args[1] = "0";
my_args[2] = NULL;
execv("sigshooter1",my_args);
fprintf(stderr,"sigshooter1 cannot be executed by first child...");
exit(-1);
}
pid2 = fork();
if(pid2 < 0)
{
fprintf(stderr, ": fork failed: %s\n", strerror(errno));
exit(1);
}
if(pid2 == 0)
{
sprintf(str, "%d", pid1);
my_args[0] = "sigperf1";
my_args[1] = str;
my_args[2] = NULL;
// printf("this is converted = %s\n",my_args[1]);
//sleep(1);
execv("sigshooter1",my_args);
fprintf(stderr,"sigshooter1 cannot be executed by second child...");
exit(-1);
}
wid = wait(NULL);
}

Answer 1

You'll need a profiler for that. For starters, you can run perf stat ./a.out to get the total CPU time of all three processes, and perf stat -i ./a.out to get the CPU time of parent process only.
If you need something more detailed, take a look at more serious tools like valgrind or gprof.