IPC - POSIX Shared Memory

shmget() system call - create shared memory
shmat() system call - process that wish to access the shared memory  must attach it to their address space
shmdt() system call - when process no longer wish to access the shared memory, it can be detached from the address space using this call
shmctl() system  call - remove shared memory from system

Other processes that wish to access this shared memory must first attach to it using shmat()

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IPC_sharedmemory.c
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