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1da177e4 LT |
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 */ | |
9 | struct 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 | ||
cba4fbbf AB |
52 | /* |
53 | * These are used to wrap system calls. | |
54 | * | |
55 | * See architecture code for ugly details.. | |
56 | */ | |
57 | struct 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 | ||
1da177e4 LT |
80 | #ifdef __KERNEL__ |
81 | ||
b119f13f | 82 | #include <linux/kref.h> |
0a3021f4 | 83 | #include <linux/spinlock.h> |
b119f13f | 84 | |
1da177e4 LT |
85 | #define IPCMNI 32768 /* <= MAX_INT limit for ipc arrays (including sysctl changes) */ |
86 | ||
87 | /* used by in-kernel data structures */ | |
88 | struct kern_ipc_perm | |
89 | { | |
90 | spinlock_t lock; | |
91 | int deleted; | |
7ca7e564 | 92 | int id; |
1da177e4 LT |
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 | ||
25b21cb2 KK |
103 | struct ipc_ids; |
104 | struct 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; | |
3ac88a41 KK |
114 | atomic_t msg_bytes; |
115 | atomic_t msg_hdrs; | |
25b21cb2 KK |
116 | |
117 | size_t shm_ctlmax; | |
118 | size_t shm_ctlall; | |
119 | int shm_ctlmni; | |
120 | int shm_tot; | |
121 | }; | |
122 | ||
123 | extern struct ipc_namespace init_ipc_ns; | |
73ea4130 KK |
124 | |
125 | #ifdef CONFIG_SYSVIPC | |
126 | #define INIT_IPC_NS(ns) .ns = &init_ipc_ns, | |
7d69a1f4 | 127 | extern void free_ipc_ns(struct kref *kref); |
e3222c4e BP |
128 | extern struct ipc_namespace *copy_ipcs(unsigned long flags, |
129 | struct ipc_namespace *ns); | |
73ea4130 KK |
130 | #else |
131 | #define INIT_IPC_NS(ns) | |
e3222c4e BP |
132 | static inline struct ipc_namespace *copy_ipcs(unsigned long flags, |
133 | struct ipc_namespace *ns) | |
134 | { | |
135 | return ns; | |
136 | } | |
73ea4130 KK |
137 | #endif |
138 | ||
25b21cb2 KK |
139 | static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) |
140 | { | |
7d69a1f4 | 141 | #ifdef CONFIG_SYSVIPC |
25b21cb2 KK |
142 | if (ns) |
143 | kref_get(&ns->kref); | |
73ea4130 | 144 | #endif |
25b21cb2 KK |
145 | return ns; |
146 | } | |
147 | ||
148 | static inline void put_ipc_ns(struct ipc_namespace *ns) | |
149 | { | |
7d69a1f4 | 150 | #ifdef CONFIG_SYSVIPC |
25b21cb2 | 151 | kref_put(&ns->kref, free_ipc_ns); |
73ea4130 | 152 | #endif |
25b21cb2 KK |
153 | } |
154 | ||
1da177e4 LT |
155 | #endif /* __KERNEL__ */ |
156 | ||
157 | #endif /* _LINUX_IPC_H */ |