#ifndef _SYS_IPC_H
#define _SYS_IPC_H

typedef long key_t;

/* Common IPC Access Structure */
struct ipc_perm {
	uid_t	uid;	/* owner's user id */
	gid_t	gid;	/* owner's group id */
	uid_t	cuid;	/* creator's user id */
	gid_t	cgid;	/* creator's group id */
	mode_t	mode;	/* access modes */
	key_t	key;	/* key */
};

/* Common IPC Definitions. */
/* Mode bits. */
#define	IPC_ALLOC	0100000		/* entry currently allocated */
#define	IPC_CREAT	0001000		/* create entry if key doesn't exist */
#define	IPC_EXCL	0002000		/* fail if key exists */
#define	IPC_NOWAIT	0004000		/* error if request must wait */

/* Keys. */
#define	IPC_PRIVATE	(key_t)0	/* private key */

/* Control Commands. */
#define	IPC_RMID	0	/* remove identifier */
#define	IPC_SET		1	/* set options */
#define	IPC_STAT	2	/* get options */

#endif	/* _SYS_IPC_H */