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-space programs should call the appropriate functions by their usual names.
Only standard library implementors and kernel hackers need to know about
ipc().
ipc() is Linux-specific, and should not be used in programs intended to
be portable.
On some architectures—for example x86-64 and ARM—there is no
ipc() system call; instead,
msgctl(2),
semctl(2),
shmctl(2), and so on really are implemented as separate system calls.
msgctl(2),
msgget(2),
msgrcv(2),
msgsnd(2),
semctl(2),
semget(2),
semop(2),
semtimedop(2),
shmat(2),
shmctl(2),
shmdt(2),
shmget(2),
sysvipc(7)