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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 */
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