Fork () in Linux

Outline

Write a C program that uses the fork() system call to create a total of 9 processes (including the parent process). Your program must print the pids of all the processes created to a file.

• To get the pid of the current process use the getpid() function.
• • Print the output in a text file named output.txt or take a screenshot for the result.
• Create 9 processes.

/**

* You can verify your answer by counting

* the number of unique processes which are output

* by the call to getpid() - which is 3 unique processes.

* Note: The statement 'printf("%d ",getpid());' prints

* the pid of the current process.

* Process tree: In the current program, the root P1 has a child P2,

* and P2 has a child P3.

*/

#include

#include /* This header file has the definition for pid_t

type*/

int main()

{

pid_t pid;

printf("%d ",getpid()); /*This Will print the root*/

pid = fork();

printf("%d ",getpid());

if(pid == 0) {

fork();

printf("%d ",getpid());

}

else {

/*Do Nothing*/

}

return 0;

}