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 int auto_msgmni;
40
41 size_t shm_ctlmax;
42 size_t shm_ctlall;
43 int shm_ctlmni;
44 int shm_tot;
45
46 struct notifier_block ipcns_nb;
47};
48
49extern struct ipc_namespace init_ipc_ns;
50extern atomic_t nr_ipc_ns;
51
52#ifdef CONFIG_SYSVIPC
53#define INIT_IPC_NS(ns) .ns = &init_ipc_ns,
54
55extern int register_ipcns_notifier(struct ipc_namespace *);
56extern int cond_register_ipcns_notifier(struct ipc_namespace *);
57extern void unregister_ipcns_notifier(struct ipc_namespace *);
58extern int ipcns_notify(unsigned long);
59
60#else /* CONFIG_SYSVIPC */
61#define INIT_IPC_NS(ns)
62#endif /* CONFIG_SYSVIPC */
63
64#if defined(CONFIG_SYSVIPC) && defined(CONFIG_IPC_NS)
65extern void free_ipc_ns(struct kref *kref);
66extern struct ipc_namespace *copy_ipcs(unsigned long flags,
67 struct ipc_namespace *ns);
68extern void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
69 void (*free)(struct ipc_namespace *,
70 struct kern_ipc_perm *));
71
72static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
73{
74 if (ns)
75 kref_get(&ns->kref);
76 return ns;
77}
78
79static inline void put_ipc_ns(struct ipc_namespace *ns)
80{
81 kref_put(&ns->kref, free_ipc_ns);
82}
83#else
84static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
85 struct ipc_namespace *ns)
86{
87 if (flags & CLONE_NEWIPC)
88 return ERR_PTR(-EINVAL);
89
90 return ns;
91}
92
93static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
94{
95 return ns;
96}
97
98static inline void put_ipc_ns(struct ipc_namespace *ns)
99{
100}
101#endif
102#endif