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#ifndef _LINUX_IPC_H

#define _LINUX_IPC_H

#include <linux/types.h>

typedef int key_t;              /* should go in <types.h> type for IPC key */

#define IPC_PRIVATE ((key_t) 0)  

struct ipc_perm

{

  key_t  key;

  ushort uid;   /* owner euid and egid */

  ushort gid;

  ushort cuid;  /* creator euid and egid */

  ushort cgid;

  ushort mode;  /* access modes see mode flags below */

  ushort seq;   /* sequence number */

};

/* 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 */

/*

 * 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 */

#ifdef __KERNEL__

/* special shmsegs[id], msgque[id] or semary[id]  values */

#define IPC_UNUSED      ((void *) -1)

#define IPC_NOID        ((void *) -2)           /* being allocated/destroyed */

/*

 * These are used to wrap system calls. See ipc/util.c.

 */

struct ipc_kludge {

    struct msgbuf *msgp;

    long msgtyp;

};

#define SEMOP           1

#define SEMGET          2

#define SEMCTL          3

#define MSGSND          11

#define MSGRCV          12

#define MSGGET          13

#define MSGCTL          14

#define SHMAT           21

#define SHMDT           22

#define SHMGET          23

#define SHMCTL          24

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

#endif /* __KERNEL__ */

#endif /* _LINUX_IPC_H */