1. Parallel and Concurrent Programming - CS3D666 - Hour 2: Pipes and Execute

Execute:
1. Write a small program that prints the pid and ppid of the current process (use getpid() and getppid() ).
2. Write a program that forks and then executes the program written in 1 using the child process. In the parent program print out the child pid and current pid to ensure they match those printed in 1.
3. Modify your program in 1. To accept arguments in main (see notes) and print out the contents of the arguments. Call the program from your program in 2 passing 4 strings.
4. Write a program that requests the user for an integer and then passes it back through the exit() function to the parent. The parent should wait for the child to terminate before printing the value passed back.

2. Pipes

5. Create a program that opens a pipe, writes to it and then reads from it using a single process (do not use fork() ).
6. Modify the program in 5 to have the parent process write to the pipe and the child process read from it.
7. Create a program that creates two pipes and two children processes. Data should be sent by the parent to the children. Data should be read by the children.
8. What happens if both children share a single pipe?
9. Can a pipe be used to send data in both directions (try it send data from parent to child and then back again)? If not how can you work around this?

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