Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef __IPC_NAMESPACE_H__
2#define __IPC_NAMESPACE_H__
3
4#include <linux/err.h>
5#include <linux/idr.h>
6#include <linux/rwsem.h>
7#include <linux/notifier.h>
8
9/*
10 * ipc namespace events
11 */
12#define IPCNS_MEMCHANGED 0x00000001 /* Notify lowmem size changed */
13#define IPCNS_CREATED 0x00000002 /* Notify new ipc namespace created */
14#define IPCNS_REMOVED 0x00000003 /* Notify ipc namespace removed */
15
16#define IPCNS_CALLBACK_PRI 0
17
18
19struct ipc_ids {
20 int in_use;
21 unsigned short seq;
22 unsigned short seq_max;
23 struct rw_semaphore rw_mutex;
24 struct idr ipcs_idr;
25};
26
27struct ipc_namespace {
28 struct kref kref;
29 struct ipc_ids ids[3];
30
31 int sem_ctls[4];
32 int used_sems;
33
34 int msg_ctlmax;
35 int msg_ctlmnb;
36 int msg_ctlmni;
37 atomic_t msg_bytes;
38 atomic_t msg_hdrs;
39
40 size_t shm_ctlmax;
41 size_t shm_ctlall;
42 int shm_ctlmni;
43 int shm_tot;
44
45 struct notifier_block ipcns_nb;
46};
47
48extern struct ipc_namespace init_ipc_ns;
49extern atomic_t nr_ipc_ns;
50
51#ifdef CONFIG_SYSVIPC
52#define INIT_IPC_NS(ns) .ns = &init_ipc_ns,
53
54extern int register_ipcns_notifier(struct ipc_namespace *);
55extern int cond_register_ipcns_notifier(struct ipc_namespace *);
56extern int unregister_ipcns_notifier(struct ipc_namespace *);
57extern int ipcns_notify(unsigned long);
58
59#else /* CONFIG_SYSVIPC */
60#define INIT_IPC_NS(ns)
61#endif /* CONFIG_SYSVIPC */
62
63#if defined(CONFIG_SYSVIPC) && defined(CONFIG_IPC_NS)
64extern void free_ipc_ns(struct kref *kref);
65extern struct ipc_namespace *copy_ipcs(unsigned long flags,
66 struct ipc_namespace *ns);
67extern void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
68 void (*free)(struct ipc_namespace *,
69 struct kern_ipc_perm *));
70
71static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
72{
73 if (ns)
74 kref_get(&ns->kref);
75 return ns;
76}
77
78static inline void put_ipc_ns(struct ipc_namespace *ns)
79{
80 kref_put(&ns->kref, free_ipc_ns);
81}
82#else
83static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
84 struct ipc_namespace *ns)
85{
86 if (flags & CLONE_NEWIPC)
87 return ERR_PTR(-EINVAL);
88
89 return ns;
90}
91
92static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
93{
94 return ns;
95}
96
97static inline void put_ipc_ns(struct ipc_namespace *ns)
98{
99}
100#endif
101#endif