home *** CD-ROM | disk | FTP | other *** search
- #ifndef __IPC_NAMESPACE_H__
- #define __IPC_NAMESPACE_H__
-
- #include <linux/err.h>
- #include <linux/idr.h>
- #include <linux/rwsem.h>
- #include <linux/notifier.h>
-
- /*
- * ipc namespace events
- */
- #define IPCNS_MEMCHANGED 0x00000001 /* Notify lowmem size changed */
- #define IPCNS_CREATED 0x00000002 /* Notify new ipc namespace created */
- #define IPCNS_REMOVED 0x00000003 /* Notify ipc namespace removed */
-
- #define IPCNS_CALLBACK_PRI 0
-
-
- struct ipc_ids {
- int in_use;
- unsigned short seq;
- unsigned short seq_max;
- struct rw_semaphore rw_mutex;
- struct idr ipcs_idr;
- };
-
- 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;
- atomic_t msg_bytes;
- atomic_t msg_hdrs;
- int auto_msgmni;
-
- size_t shm_ctlmax;
- size_t shm_ctlall;
- int shm_ctlmni;
- int shm_tot;
-
- struct notifier_block ipcns_nb;
- };
-
- extern struct ipc_namespace init_ipc_ns;
- extern atomic_t nr_ipc_ns;
-
- #ifdef CONFIG_SYSVIPC
- #define INIT_IPC_NS(ns) .ns = &init_ipc_ns,
-
- extern int register_ipcns_notifier(struct ipc_namespace *);
- extern int cond_register_ipcns_notifier(struct ipc_namespace *);
- extern void unregister_ipcns_notifier(struct ipc_namespace *);
- extern int ipcns_notify(unsigned long);
-
- #else /* CONFIG_SYSVIPC */
- #define INIT_IPC_NS(ns)
- #endif /* CONFIG_SYSVIPC */
-
- #if defined(CONFIG_SYSVIPC) && defined(CONFIG_IPC_NS)
- extern void free_ipc_ns(struct kref *kref);
- extern struct ipc_namespace *copy_ipcs(unsigned long flags,
- struct ipc_namespace *ns);
- extern void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
- void (*free)(struct ipc_namespace *,
- struct kern_ipc_perm *));
-
- static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
- {
- if (ns)
- kref_get(&ns->kref);
- return ns;
- }
-
- static inline void put_ipc_ns(struct ipc_namespace *ns)
- {
- kref_put(&ns->kref, free_ipc_ns);
- }
- #else
- static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
- struct ipc_namespace *ns)
- {
- if (flags & CLONE_NEWIPC)
- return ERR_PTR(-EINVAL);
-
- return ns;
- }
-
- static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
- {
- return ns;
- }
-
- static inline void put_ipc_ns(struct ipc_namespace *ns)
- {
- }
- #endif
- #endif
-