103 lines
2.2 KiB
C
103 lines
2.2 KiB
C
#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
|