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System Software Lab Programs ( UNIX Programs ) – 4b

// June 4th, 2009 // Educational, Engineering, Unix and System Software Lab

Subject : System Software Laboratory

Branch : Information Science & Engineering

Semester : 6

University : VTU

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PART -B

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4b) C program to do the following: Using fork( ) create a child process. The child process prints its own process-id and id of its parent and then exits. The parent process waits for its child to finish (by executing the wait( )) and prints its own process-id and the id of its child process and then exits.

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

int main()
{
int status,ppid,mpid,pid;
pid=fork();

if(pid<0)
{
printf(“Error in forking a child..!”);
exit(0);
}

if(pid==0)
{
ppid=getppid();

printf(“\nChild is executing and it’s Parent ID is  : %d”,ppid);
mpid=getpid();
printf(“\nChild ID is  : %d”,mpid);
kill();
exit(0);
}
//pid=wait(pid,&status,0);
mpid=getpid();

printf(“\nParent ID is : %d  and it’s child ID is : %d\n”,mpid,pid);
}

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