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#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <unistd.h>
#include <sys/wait.h>
#include <time.h>
int main(int argc, char *argv[]){
if(argc < 2){
printf("Usage: tme [program]\n");
return 1;
}
struct timespec t_start, t_end;
pid_t cpid = fork();
clock_gettime(CLOCK_MONOTONIC, &t_start);
if(cpid == 0){
int r = execvp(argv[1], argv+1);
//r = execv(argv[1], argv+1);
if(r == -1){
perror("tme");
}
return 2;
}
int wstatus;
waitpid(cpid, &wstatus, 2); // use 2 instead of 1 because WNOHANG is 1
clock_gettime(CLOCK_MONOTONIC, &t_end);
uint64_t diff = (t_end.tv_sec*1000000000 + t_end.tv_nsec) - (t_start.tv_sec*1000000000 + t_start.tv_nsec);
double timing = diff/1000000000.0;
printf("time: %lfs\n", timing);
if(WIFEXITED(wstatus)){
printf("'%s' exited with status %d\n", argv[1], WEXITSTATUS(wstatus));
}
return 0;
}
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