How to share memory between processes created by fork()?

Question

In fork child, if we modify a global variable, it will not get changed in the main program.

Is there a way to change a global variable in child fork?

Answer 1

Changing a global variable is not possible because the new created process (child)is having it's own address space.

So it's better to use shmget(),shmat() from POSIX api

Or You can use pthread , since pthreadsare sharing the globaldata and the changes in global variable is reflected in parent.

Then read some Pthreads tutorial.