ipc - System V IPC system calls

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().

Standard C library (libc, -lc)

ipc - System V IPC 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) Linux man-pages 6.9.1 2024-05-02 ipc(2)

Linux.

#include<linux/ipc.h> /* Definition of needed constants */ #include<sys/syscall.h> /* Definition of SYS_* constants */ #include<unistd.h>intsyscall(SYS_ipc,unsignedintcall,intfirst,unsignedlongsecond,unsignedlongthird,void*ptr,longfifth);Note: glibc provides no wrapper for ipc(), necessitating the use of syscall(2).

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.