Manpages - ipc.2

ipc - System V IPC system calls

  #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).

*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)

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