ipc.h

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#ifndef _UAPI_LINUX_IPC_H
#define _UAPI_LINUX_IPC_H

#include <linux/types.h>

#define IPC_PRIVATE ((__kernel_key_t) 0)  

/* Obsolete, used only for backwards compatibility and libc5 compiles */
struct ipc_perm
{
    __kernel_key_t  key;
    __kernel_uid_t  uid;
    __kernel_gid_t  gid;
    __kernel_uid_t  cuid;
    __kernel_gid_t  cgid;
    __kernel_mode_t mode; 
    unsigned short  seq;
};

/* Include the definition of ipc64_perm */
#include <asm/ipcbuf.h>

/* resource get request flags */
#define IPC_CREAT  00001000   /* create if key is nonexistent */
#define IPC_EXCL   00002000   /* fail if key exists */
#define IPC_NOWAIT 00004000   /* return error on wait */

/* these fields are used by the DIPC package so the kernel as standard
   should avoid using them if possible */
   
#define IPC_DIPC 00010000  /* make it distributed */
#define IPC_OWN  00020000  /* this machine is the DIPC owner */

/* 
 * Control commands used with semctl, msgctl and shmctl 
 * see also specific commands in sem.h, msg.h and shm.h
 */
#define IPC_RMID 0     /* remove resource */
#define IPC_SET  1     /* set ipc_perm options */
#define IPC_STAT 2     /* get ipc_perm options */
#define IPC_INFO 3     /* see ipcs */

/*
 * Version flags for semctl, msgctl, and shmctl commands
 * These are passed as bitflags or-ed with the actual command
 */
#define IPC_OLD 0   /* Old version (no 32-bit UID support on many
               architectures) */
#define IPC_64  0x0100  /* New version (support 32-bit UIDs, bigger
               message sizes, etc. */

/*
 * These are used to wrap system calls.
 *
 * See architecture code for ugly details..
 */
struct ipc_kludge {
    struct msgbuf __user *msgp;
    long msgtyp;
};

#define SEMOP        1
#define SEMGET       2
#define SEMCTL       3
#define SEMTIMEDOP   4
#define MSGSND      11
#define MSGRCV      12
#define MSGGET      13
#define MSGCTL      14
#define SHMAT       21
#define SHMDT       22
#define SHMGET      23
#define SHMCTL      24

/* Used by the DIPC package, try and avoid reusing it */
#define DIPC            25

#define IPCCALL(version,op) ((version)<<16 | (op))


#endif /* _UAPI_LINUX_IPC_H */