IPC(2) Linux Programmer's Manual IPC(2)

ipc - System V IPC system calls

int ipc(unsigned int call, int first, unsigned long second,
        unsigned long third, void *ptr, long fifth);

Note: There is no glibc wrapper for this system call; see NOTES.

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.

Glibc does not provide a wrapper for this system call; in the unlikely event that you want to call it directly, you can do so using syscall(2).

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)

This page is part of release 5.11 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
2021-03-22 Linux