Question

#include <sys/types.h> #include <unistd.h> #include <stdio.h> int main(void) {       pid_t child_pid; int   count = 6;...

#include <sys/types.h>

#include <unistd.h>

#include <stdio.h>

int main(void)

{

      pid_t child_pid;

int   count = 6;

      child_pid = fork();

      if (child_pid == 0) {

            execl("/bin/ls", "ls", "-l", NULL);

            ++count;

            exit(1);

}

      else

            count = count * 2;

      printf ("The counter = %d \n", count);

      return 0;}

If execl succeeds, what will be the output for the child process? For the parent process?

If execl fails, what will be the output for the child process? For the parent process?

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Answer #1

If execl succeeds

For the child process:- Print output of the command ls -l when execute in current directory through terminal. excel() returns only if there is error.

For parent process:- The counter = 12

Here counter value is 12 as it gets multipled by 2 and is initialized to 6;

If execl fails

For the child process:- No output. execl() returns -1 on error. It increments count variable and exits.

For parent process:- The counter = 12

Parent ouput is same as before as execl() is not invoked by parent.

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