Description
1 Write a program children.c , and let the parent process produce two child processes. One prints out “I am child one, my pid is: ” PID, and the other prints out “I am child two, 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.
Part 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.
//parent P 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+20 print values of a, b, and process_id else a=(a*b)+30 print values of a, b, and process_id else b=a+b-5; print values of a, b, and process_id
