fork() call in c

Question

I have used fork() to create 2 different processes operating on 2 different address spaces. Now, in parent process I need the value of a variable from child's address space or if the child process can modify the variable in parent's address space. Is this possible?

Answer 1

No, once you've forked, each process gets its own address space and you'll have to look into either:

• some form of IPC between the processes to access each others data (such as shared memory or message queues).
• some more lighweight variant of fork that allows sharing of data (including possibly threading).