Comment by pjmlp
1 day ago
It actually kind of is, hence why you have information about parent/child and get to share memory.
This is how a http server back in the day would share the request context for the child process to reply back.
1 day ago
It actually kind of is, hence why you have information about parent/child and get to share memory.
This is how a http server back in the day would share the request context for the child process to reply back.
I would say that pipes and shared memory are the IPC mechanisms? Controlling the state of the exec'd process's file descriptors would counts as a way to set up interprocess communication, but once that's done, it's the pipe or SHM that does the actual communication.
The problem with POSIX IPC is that passing file descriptors between processes (other than parent passing to child via fork) is hard. Yes, SCM_RIGHTS can do it, but it is quite error prone and rarely done.