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#ifndef _LINUX_IPC_H
#define _LINUX_IPC_H
#include <linux/types.h>
#include <linux/kref.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. */
#ifdef __KERNEL__
#define IPCMNI 32768 /* <= MAX_INT limit for ipc arrays (including sysctl changes) */
/* used by in-kernel data structures */
struct kern_ipc_perm
{
spinlock_t lock;
int deleted;
key_t key;
uid_t uid;
gid_t gid;
uid_t cuid;
gid_t cgid;
mode_t mode;
unsigned long seq;
void *security;
};
struct ipc_ids;
struct ipc_namespace {
struct kref kref;
struct ipc_ids *ids[3];
int sem_ctls[4];
int used_sems;
int msg_ctlmax;
int msg_ctlmnb;
int msg_ctlmni;
size_t shm_ctlmax;
size_t shm_ctlall;
int shm_ctlmni;
int shm_tot;
};
extern struct ipc_namespace init_ipc_ns;
#ifdef CONFIG_SYSVIPC
#define INIT_IPC_NS(ns) .ns = &init_ipc_ns,
#else
#define INIT_IPC_NS(ns)
#endif
#ifdef CONFIG_IPC_NS
extern void free_ipc_ns(struct kref *kref);
extern int copy_ipcs(unsigned long flags, struct task_struct *tsk);
extern int unshare_ipcs(unsigned long flags, struct ipc_namespace **ns);
#else
static inline int copy_ipcs(unsigned long flags, struct task_struct *tsk)
{
return 0;
}
#endif
static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
{
#ifdef CONFIG_IPC_NS
if (ns)
kref_get(&ns->kref);
#endif
return ns;
}
static inline void put_ipc_ns(struct ipc_namespace *ns)
{
#ifdef CONFIG_IPC_NS
kref_put(&ns->kref, free_ipc_ns);
#endif
}
#endif /* __KERNEL__ */
#endif /* _LINUX_IPC_H */
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