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#ifndef _LINUX_IPC_H
#define _LINUX_IPC_H
#include <linux/types.h>
#define IPC_PRIVATE ((__kernel_key_t) 0)
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;
};
/* 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 */
#ifdef __KERNEL__
/* special shmsegs[id], msgque[id] or semary[id] values */
#define IPC_UNUSED ((void *) -1)
#define IPC_NOID ((void *) -2) /* being allocated/destroyed */
#endif /* __KERNEL__ */
#endif /* _LINUX_IPC_H */
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