How to do a cleanup after SIGKILL?

Question

I\'m working on a program which uses shared memory. Multiple instances of said program will either connect to an existing one or create it anew, and give it back to OS when

Answer 1

Combined with shared memory, robust mutexes located in the shared memory segment would be a great tool. If a process dies while holding a lock on a robust mutex, the next process to attempt locking it will get EOWNERDEAD and can perform the cleanup the original owner should have performed.