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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 | ||
52 | #ifdef __KERNEL__ | |
53 | ||
b119f13f | 54 | #include <linux/kref.h> |
0a3021f4 | 55 | #include <linux/spinlock.h> |
b119f13f | 56 | |
1da177e4 LT |
57 | #define IPCMNI 32768 /* <= MAX_INT limit for ipc arrays (including sysctl changes) */ |
58 | ||
59 | /* used by in-kernel data structures */ | |
60 | struct kern_ipc_perm | |
61 | { | |
62 | spinlock_t lock; | |
63 | int deleted; | |
64 | key_t key; | |
65 | uid_t uid; | |
66 | gid_t gid; | |
67 | uid_t cuid; | |
68 | gid_t cgid; | |
69 | mode_t mode; | |
70 | unsigned long seq; | |
71 | void *security; | |
72 | }; | |
73 | ||
25b21cb2 KK |
74 | struct ipc_ids; |
75 | struct ipc_namespace { | |
76 | struct kref kref; | |
77 | struct ipc_ids *ids[3]; | |
78 | ||
79 | int sem_ctls[4]; | |
80 | int used_sems; | |
81 | ||
82 | int msg_ctlmax; | |
83 | int msg_ctlmnb; | |
84 | int msg_ctlmni; | |
85 | ||
86 | size_t shm_ctlmax; | |
87 | size_t shm_ctlall; | |
88 | int shm_ctlmni; | |
89 | int shm_tot; | |
90 | }; | |
91 | ||
92 | extern struct ipc_namespace init_ipc_ns; | |
73ea4130 KK |
93 | |
94 | #ifdef CONFIG_SYSVIPC | |
95 | #define INIT_IPC_NS(ns) .ns = &init_ipc_ns, | |
7d69a1f4 | 96 | extern void free_ipc_ns(struct kref *kref); |
e3222c4e BP |
97 | extern struct ipc_namespace *copy_ipcs(unsigned long flags, |
98 | struct ipc_namespace *ns); | |
73ea4130 KK |
99 | #else |
100 | #define INIT_IPC_NS(ns) | |
e3222c4e BP |
101 | static inline struct ipc_namespace *copy_ipcs(unsigned long flags, |
102 | struct ipc_namespace *ns) | |
103 | { | |
104 | return ns; | |
105 | } | |
73ea4130 KK |
106 | #endif |
107 | ||
25b21cb2 KK |
108 | static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns) |
109 | { | |
7d69a1f4 | 110 | #ifdef CONFIG_SYSVIPC |
25b21cb2 KK |
111 | if (ns) |
112 | kref_get(&ns->kref); | |
73ea4130 | 113 | #endif |
25b21cb2 KK |
114 | return ns; |
115 | } | |
116 | ||
117 | static inline void put_ipc_ns(struct ipc_namespace *ns) | |
118 | { | |
7d69a1f4 | 119 | #ifdef CONFIG_SYSVIPC |
25b21cb2 | 120 | kref_put(&ns->kref, free_ipc_ns); |
73ea4130 | 121 | #endif |
25b21cb2 KK |
122 | } |
123 | ||
1da177e4 LT |
124 | #endif /* __KERNEL__ */ |
125 | ||
126 | #endif /* _LINUX_IPC_H */ |