GETPID SYSTEM CALL
AIM:
To write a c program to implement getpid system call.
ALGORITHM:
STEP 1: Start the program.
STEP 2: Include the header file.
STEP 3: Declare the variable pid.
STEP 4: Assign pid=fork().
STEP 5: If pid is greater than zero display the parent and child before
fork.
STEP 6: Else if pid==0 display parent and child on executing
STEP 7: Else display fork error.
STEP 8: Stop the program.
PROGRAM:
#include<stdio.h>
int main()
{
int pid;
printf("before fork\n");
pid=fork();
if(pid>0)
{
sleep(1);
printf("parent%d,\nchild%d",getpid(),pid);
}
elseif(pid==0)
{
printf("parent%d,\nchild%d",getppid(),getpid());
}
else
{
printf("\nfork error");
exit(1);
}
printf("both executing\n");
exit(0);
}
OUTPUT:
$ cc getpid.c
$./a.out
Before fork
Parent 3406
Child 3407 both executing
Parent 3406
Child 3407 both executing
