modify this program so that it used clone instead of fork. the output should be

Question

modify this program so that it used clone instead of fork.

the output should be

This is process(thread) 11501.
x+y=1
>
This is process(thread) 11502.
x+y=7

//fork makes a second process, running the same executable

//pid_t used to be long, but now just int
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
  
int main ( void ) {
int x=0, y=0;
pid_t pid, fpid;
fpid = fork ();
pid = getpid();
if (fpid > 0){
printf (" This is process(thread) %d. ",pid);
y=1;
}
else if (fpid == 0){
sleep(1);
printf (" This is process(thread) %d. ",pid);
x=7;
}
else {
printf ("fork failed ");
return (1);
}
printf("x+y=%d ",x+y);
}

Explanation / Answer

Program that shows how fork system call works

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>

int main(void)
{
pid_t pid;
   char cwdir_cld[100];
   char cwdir_prt[100];

   if ((pid = fork()) < 0) {
   perror("fork error");
       exit(1);
   }

   if (pid == 0) {
   /*
   * Now we are in the childs thread
   * let us issue a chdir syscall :)
   */
if(chdir("/tmp") < 0) {
   perror("chdir error");
       }
      
       /*
       * Let us now print the current working directory of the child
       */
       if (getcwd(cwdir_cld, 100) != NULL) {
       printf("
Current working directory of the child is : %s", cwdir_cld);
       } else {
       perror("
getcwd error");
       }
      
   /* end of the child */
   } else {
   /*
   * Now we are in the parent thread
   * Let is check the current working directory
   */
   if (getcwd(cwdir_prt, 100) != NULL) {
       printf("
Current working directory of the parent is : %s", cwdir_prt);
       } else {
       perror("
getcwd error");
       }
   }

printf("
");
   return(0);
}

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