Attachment 161911 Details for Bug 144749 – time(1) with a better precision.

time(1) with a better precision.

timeclock.c (text/plain), 1.05 KB, created by Jan Kratochvil on 2007-08-20 18:11:00 UTC

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Creator: Jan Kratochvil

Created: 2007-08-20 18:11:00 UTC

Size: 1.05 KB

patch

obsolete

>#include <sys/time.h>
>#include <stdlib.h>
>#include <sys/wait.h>
>#include <unistd.h>
>#include <stdio.h>
>
>int main (int argc, char **argv)
>{
>  struct timeval tv_start, tv_end, tv_total;
>  pid_t child, pid_got;
>  int status;
>
>  if (gettimeofday (&tv_start, NULL) != 0)
>    {
>      perror ("gettimeofday ()");
>      exit (EXIT_FAILURE);
>    }
>
>  child = fork ();
>  switch (child)
>    {
>    case -1:
>      perror ("fork ()");
>      exit (EXIT_FAILURE);
>    case 0:
>      execvp (argv[1], argv + 1);
>      perror ("execvp ()");
>      exit (EXIT_FAILURE);
>    default:
>      pid_got = waitpid (child, &status, 0);
>      if (pid_got != child)
>        {
>	  perror ("waitpid ()");
>	  exit (EXIT_FAILURE);
>	}
>      if (!WIFEXITED (status))
>        {
>	  fputs ("!WIFEXITED", stderr);
>	  exit (EXIT_FAILURE);
>	}
>      break;
>    }
>
>  if (gettimeofday (&tv_end, NULL) != 0)
>    {
>      perror ("gettimeofday ()");
>      exit (EXIT_FAILURE);
>    }
>
>  timersub (&tv_end, &tv_start, &tv_total);
>  printf ("%ld.%06ld\n", tv_total.tv_sec, tv_total.tv_usec);
>
>  return WEXITSTATUS (status);
>}

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Attachments on bug 144749: 161819 | 161911