blob: 636094c29b167e185168d10882fd2c497903d166 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _LINUX_IPC_H
2#define _LINUX_IPC_H
3
4#include <linux/types.h>
5
6#define IPC_PRIVATE ((__kernel_key_t) 0)
7
8/* Obsolete, used only for backwards compatibility and libc5 compiles */
9struct ipc_perm
10{
11 __kernel_key_t key;
12 __kernel_uid_t uid;
13 __kernel_gid_t gid;
14 __kernel_uid_t cuid;
15 __kernel_gid_t cgid;
16 __kernel_mode_t mode;
17 unsigned short seq;
18};
19
20/* Include the definition of ipc64_perm */
21#include <asm/ipcbuf.h>
22
23/* resource get request flags */
24#define IPC_CREAT 00001000 /* create if key is nonexistent */
25#define IPC_EXCL 00002000 /* fail if key exists */
26#define IPC_NOWAIT 00004000 /* return error on wait */
27
28/* these fields are used by the DIPC package so the kernel as standard
29 should avoid using them if possible */
30
31#define IPC_DIPC 00010000 /* make it distributed */
32#define IPC_OWN 00020000 /* this machine is the DIPC owner */
33
34/*
35 * Control commands used with semctl, msgctl and shmctl
36 * see also specific commands in sem.h, msg.h and shm.h
37 */
38#define IPC_RMID 0 /* remove resource */
39#define IPC_SET 1 /* set ipc_perm options */
40#define IPC_STAT 2 /* get ipc_perm options */
41#define IPC_INFO 3 /* see ipcs */
42
43/*
44 * Version flags for semctl, msgctl, and shmctl commands
45 * These are passed as bitflags or-ed with the actual command
46 */
47#define IPC_OLD 0 /* Old version (no 32-bit UID support on many
48 architectures) */
49#define IPC_64 0x0100 /* New version (support 32-bit UIDs, bigger
50 message sizes, etc. */
51
52#ifdef __KERNEL__
53
Cedric Le Goaterb119f132006-10-04 02:15:19 -070054#include <linux/kref.h>
55
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#define IPCMNI 32768 /* <= MAX_INT limit for ipc arrays (including sysctl changes) */
57
58/* used by in-kernel data structures */
59struct kern_ipc_perm
60{
61 spinlock_t lock;
62 int deleted;
63 key_t key;
64 uid_t uid;
65 gid_t gid;
66 uid_t cuid;
67 gid_t cgid;
68 mode_t mode;
69 unsigned long seq;
70 void *security;
71};
72
Kirill Korotaev25b21cb2006-10-02 02:18:19 -070073struct ipc_ids;
74struct ipc_namespace {
75 struct kref kref;
76 struct ipc_ids *ids[3];
77
78 int sem_ctls[4];
79 int used_sems;
80
81 int msg_ctlmax;
82 int msg_ctlmnb;
83 int msg_ctlmni;
84
85 size_t shm_ctlmax;
86 size_t shm_ctlall;
87 int shm_ctlmni;
88 int shm_tot;
89};
90
91extern struct ipc_namespace init_ipc_ns;
Kirill Korotaev73ea4132006-10-02 02:18:20 -070092
93#ifdef CONFIG_SYSVIPC
94#define INIT_IPC_NS(ns) .ns = &init_ipc_ns,
95#else
96#define INIT_IPC_NS(ns)
97#endif
98
99#ifdef CONFIG_IPC_NS
Kirill Korotaev25b21cb2006-10-02 02:18:19 -0700100extern void free_ipc_ns(struct kref *kref);
101extern int copy_ipcs(unsigned long flags, struct task_struct *tsk);
102extern int unshare_ipcs(unsigned long flags, struct ipc_namespace **ns);
Kirill Korotaev73ea4132006-10-02 02:18:20 -0700103#else
104static inline int copy_ipcs(unsigned long flags, struct task_struct *tsk)
105{
106 return 0;
107}
108#endif
Kirill Korotaev25b21cb2006-10-02 02:18:19 -0700109
110static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
111{
Kirill Korotaev73ea4132006-10-02 02:18:20 -0700112#ifdef CONFIG_IPC_NS
Kirill Korotaev25b21cb2006-10-02 02:18:19 -0700113 if (ns)
114 kref_get(&ns->kref);
Kirill Korotaev73ea4132006-10-02 02:18:20 -0700115#endif
Kirill Korotaev25b21cb2006-10-02 02:18:19 -0700116 return ns;
117}
118
119static inline void put_ipc_ns(struct ipc_namespace *ns)
120{
Kirill Korotaev73ea4132006-10-02 02:18:20 -0700121#ifdef CONFIG_IPC_NS
Kirill Korotaev25b21cb2006-10-02 02:18:19 -0700122 kref_put(&ns->kref, free_ipc_ns);
Kirill Korotaev73ea4132006-10-02 02:18:20 -0700123#endif
Kirill Korotaev25b21cb2006-10-02 02:18:19 -0700124}
125
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126#endif /* __KERNEL__ */
127
128#endif /* _LINUX_IPC_H */
129
130