Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#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/*
53 * These are used to wrap system calls.
54 *
55 * See architecture code for ugly details..
56 */
57struct ipc_kludge {
58 struct msgbuf __user *msgp;
59 long msgtyp;
60};
61
62#define SEMOP 1
63#define SEMGET 2
64#define SEMCTL 3
65#define SEMTIMEDOP 4
66#define MSGSND 11
67#define MSGRCV 12
68#define MSGGET 13
69#define MSGCTL 14
70#define SHMAT 21
71#define SHMDT 22
72#define SHMGET 23
73#define SHMCTL 24
74
75/* Used by the DIPC package, try and avoid reusing it */
76#define DIPC 25
77
78#define IPCCALL(version,op) ((version)<<16 | (op))
79
80#ifdef __KERNEL__
81
82#include <linux/kref.h>
83#include <linux/spinlock.h>
84
85#define IPCMNI 32768 /* <= MAX_INT limit for ipc arrays (including sysctl changes) */
86
87/* used by in-kernel data structures */
88struct kern_ipc_perm
89{
90 spinlock_t lock;
91 int deleted;
92 int id;
93 key_t key;
94 uid_t uid;
95 gid_t gid;
96 uid_t cuid;
97 gid_t cgid;
98 mode_t mode;
99 unsigned long seq;
100 void *security;
101};
102
103struct ipc_ids;
104struct ipc_namespace {
105 struct kref kref;
106 struct ipc_ids *ids[3];
107
108 int sem_ctls[4];
109 int used_sems;
110
111 int msg_ctlmax;
112 int msg_ctlmnb;
113 int msg_ctlmni;
114 atomic_t msg_bytes;
115 atomic_t msg_hdrs;
116
117 size_t shm_ctlmax;
118 size_t shm_ctlall;
119 int shm_ctlmni;
120 int shm_tot;
121};
122
123extern struct ipc_namespace init_ipc_ns;
124
125#ifdef CONFIG_SYSVIPC
126#define INIT_IPC_NS(ns) .ns = &init_ipc_ns,
127extern void free_ipc_ns(struct kref *kref);
128extern struct ipc_namespace *copy_ipcs(unsigned long flags,
129 struct ipc_namespace *ns);
130#else
131#define INIT_IPC_NS(ns)
132static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
133 struct ipc_namespace *ns)
134{
135 return ns;
136}
137#endif
138
139static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
140{
141#ifdef CONFIG_SYSVIPC
142 if (ns)
143 kref_get(&ns->kref);
144#endif
145 return ns;
146}
147
148static inline void put_ipc_ns(struct ipc_namespace *ns)
149{
150#ifdef CONFIG_SYSVIPC
151 kref_put(&ns->kref, free_ipc_ns);
152#endif
153}
154
155#endif /* __KERNEL__ */
156
157#endif /* _LINUX_IPC_H */