Section 2 · System calls

ipc.2

Package: man-pages

ipc

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
VERSIONS
STANDARDS
SEE ALSO

NAME

ipc − System V IPC system calls

LIBRARY

Standard C library (libc, −lc)

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).

DESCRIPTION

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().

VERSIONS

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.

STANDARDS

Linux.