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ipc() - Unix, Linux System Call
ipc - System V IPC system calls
int ipc(unsigned int call, int first, int second,
int third, void *ptr, long fifth);
ipc() is a common kernel entry point for the System V IPC calls
for messages, semaphores, and shared memory.
call determines which IPC function to invoke;
the other arguments are passed through to the appropriate call.
User programs should call the appropriate functions by their usual names.
Only standard library implementors and kernel hackers need to know about
ipc() is Linux specific, and should not be used in programs
intended to be portable.