Description
Write a program processes.c , and let the parent process produce two child processes.
One prints out “I am first child, my pid is: ” PID, and the other prints out “I am second child, my pid is: ” PID.
Guarantee that the parent terminates after the children terminate (Note, you need to wait for two child processes here). Use the getpid() function to retrieve the PID.
2 Consider the parent process as P. The program consists of fork() system call statements placed at different points in the code to create new processes Q and R. The program also shows three variables: a, b, and pid – with the print out of these variables occurring from various processes. Show the values of pid, a, and b printed by the processes P, Q, and R.
int a= 10 , b= 25 , fq= 0 , fr= 0
fq=fork() // fork a child – call it Process Q if( fq==0 ){ // Child successfully forked a=a+b print values of a, b, and process_id fr=fork() // fork another child – call it Process R if ( fr!=0 ){ b=b+15
//print values of a, b, and process_id
}else { a=(a*b)+20
//print values of a, b, and process_id
}
}else { b=a+b-5 ; print values of a, b, and process_id }
