arak.c

/*
//From https://stackoverflow.com/a/2667166/350713

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
int main()
{
    int number, statval;
    printf("%d: I'm the parent !\n", getpid());
    if(fork() == 0)
    {
        number = 10;
        printf("PID %d: exiting with number %d\n", getpid(), number);
        exit(number) ;
    }
    else
    {
        printf("PID %d: waiting for child\n", getpid());
        wait(&statval);
        if(WIFEXITED(statval))
            printf("Child's exit code %d\n", WEXITSTATUS(statval));
        else
            printf("Child did not terminate with exit\n");
    }
    return 0;
}
*/
////////////////////////////////////////////////////////////////////

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
int main()
{
  int childpid, statval;
    printf("parent PID is %d\n", getpid());
    if(fork() == 0) // child
    {
      childpid = getpid();
      printf("child PID is %d\n", getpid());
      execl("/usr/bin/lsxx","lsxx", (char*) NULL);
    }
    else // parent
    {
      printf("PID %d: waiting for child\n", getpid());
      wait(&statval);
      //waitpid(childpid, &statval, 0);
      if(WIFEXITED(statval))
	printf("Child's exit code %d\n", WEXITSTATUS(statval));
      else
	printf("Child did not terminate with exit\n");
    }
    return 0;
}