Programming Forums - Hi, I Need Help With The Fork() Command

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- - Hi, I Need Help With The Fork() Command (http://www.programmingforums.org/showthread.php?t=804)

Hi,

I need some help with using the fork() command. What I need to do is have the program create 3 child processes using fork() then each of the 3 child processes create 1 process each using fork(). Then I need the proces ID's of each process to be printed.

I have gotten the first part where I create 3 child processes, now I don't know where to insert another fork() such that each of the 3 child processes creates 1 child process of its own.

I am using the bash shell and using the "Pico" text editor to write this C Program. I am using the 'gcc' compile command to compile the program.

Here is the code I have so far:

#include <stdio.h>

#include <sys/types.h>

#include <unistd.h>



void main()

{

 *int i;

 *int n;

 *pid_t childpid;



 *for(i = 1; i < 4; ++i)

 *{

 * * if((childpid = fork()) <= 0)

 * * {

 * * * *break;

 * * }

 *}



 *fprintf(stderr, "This process %ld with parent %ld\n", (long)getpid(), (long)getppid());

}

Quote:

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

void main()
{
int i;
int n;
pid_t childpid;

for(i = 1; i < 4; ++i)
{
if((childpid = fork()) <= 0)
{
break;
}
}

fprintf(stderr, "This process %ld with parent %ld\n", (long)getpid(), (long)getppid());
}

Try it like this

#include <stdio.h>

#include <sys/types.h>

#include <unistd.h>



void main()

{

 int i;

 int n;

 pid_t childpid;



 for(i = 1; i < 4; ++i)

 {

  if((childpid = fork()) <= 0)) /*note that i put a ) at the end of the statement*/

  {

    break;

  }

 }



 fprintf(stderr, "This process %ld with parent %ld\n", (long)getpid(), (long)getppid());

}

Just remember if you have more than on "(" in a statement then you need to add 2 ))
at the end of it.

Thankz but that'z not the problem...the code works correctly...I jsut want each of hte 3 child processes to spawn 1 child of their own.

Thankz

Sebeq, take a look at that if statement - in your version, there are 3 opening tags and 4 closing tags. He was right.

Ahhh yes now i feel like a dummy. I can't see why i didn't see that :P