ipc - Online Linux Manual PageSection : 2
Updated : 2023-02-05
Source : Linux man-pages 6.03

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NAMEipc − System V IPC system calls

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LIBRARYStandard C library (libc, −lc)

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SYNOPSIS#include <linux/ipc.h> /* Definition of needed constants */ #include <sys/syscall.h> /* Definition of SYS_* constants */ #include <unistd.h>int syscall(SYS_ipc, unsigned int call, int first, unsigned long second, unsigned long third, void *ptr, long fifth);Note: glibc provides no wrapper for ipc(), necessitating the use of syscall(2).

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DESCRIPTIONipc() 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().

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STANDARDSipc() is Linux-specific, and should not be used in programs intended to be portable.

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NOTESOn 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.

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SEE ALSOmsgctl(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) 0

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