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1da177e4 LT |
1 | /* |
2 | * linux/ipc/util.h | |
3 | * Copyright (C) 1999 Christoph Rohland | |
4 | * | |
5 | * ipc helper functions (c) 1999 Manfred Spraul <manfreds@colorfullife.com> | |
6 | */ | |
7 | ||
8 | #ifndef _IPC_UTIL_H | |
9 | #define _IPC_UTIL_H | |
10 | ||
11 | #define USHRT_MAX 0xffff | |
12 | #define SEQ_MULTIPLIER (IPCMNI) | |
13 | ||
14 | void sem_init (void); | |
15 | void msg_init (void); | |
16 | void shm_init (void); | |
17 | ||
18 | struct ipc_id_ary { | |
19 | int size; | |
20 | struct kern_ipc_perm *p[0]; | |
21 | }; | |
22 | ||
23 | struct ipc_ids { | |
24 | int in_use; | |
25 | int max_id; | |
26 | unsigned short seq; | |
27 | unsigned short seq_max; | |
28 | struct semaphore sem; | |
29 | struct ipc_id_ary nullentry; | |
30 | struct ipc_id_ary* entries; | |
31 | }; | |
32 | ||
33 | void __init ipc_init_ids(struct ipc_ids* ids, int size); | |
34 | ||
35 | /* must be called with ids->sem acquired.*/ | |
36 | int ipc_findkey(struct ipc_ids* ids, key_t key); | |
37 | int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size); | |
38 | ||
39 | /* must be called with both locks acquired. */ | |
40 | struct kern_ipc_perm* ipc_rmid(struct ipc_ids* ids, int id); | |
41 | ||
42 | int ipcperms (struct kern_ipc_perm *ipcp, short flg); | |
43 | ||
44 | /* for rare, potentially huge allocations. | |
45 | * both function can sleep | |
46 | */ | |
47 | void* ipc_alloc(int size); | |
48 | void ipc_free(void* ptr, int size); | |
49 | ||
50 | /* | |
51 | * For allocation that need to be freed by RCU. | |
52 | * Objects are reference counted, they start with reference count 1. | |
53 | * getref increases the refcount, the putref call that reduces the recount | |
54 | * to 0 schedules the rcu destruction. Caller must guarantee locking. | |
55 | */ | |
56 | void* ipc_rcu_alloc(int size); | |
57 | void ipc_rcu_getref(void *ptr); | |
58 | void ipc_rcu_putref(void *ptr); | |
59 | ||
60 | struct kern_ipc_perm* ipc_get(struct ipc_ids* ids, int id); | |
61 | struct kern_ipc_perm* ipc_lock(struct ipc_ids* ids, int id); | |
62 | void ipc_lock_by_ptr(struct kern_ipc_perm *ipcp); | |
63 | void ipc_unlock(struct kern_ipc_perm* perm); | |
64 | int ipc_buildid(struct ipc_ids* ids, int id, int seq); | |
65 | int ipc_checkid(struct ipc_ids* ids, struct kern_ipc_perm* ipcp, int uid); | |
66 | ||
67 | void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out); | |
68 | void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out); | |
69 | ||
70 | #if defined(__ia64__) || defined(__x86_64__) || defined(__hppa__) | |
71 | /* On IA-64, we always use the "64-bit version" of the IPC structures. */ | |
72 | # define ipc_parse_version(cmd) IPC_64 | |
73 | #else | |
74 | int ipc_parse_version (int *cmd); | |
75 | #endif | |
76 | ||
77 | extern void free_msg(struct msg_msg *msg); | |
78 | extern struct msg_msg *load_msg(const void __user *src, int len); | |
79 | extern int store_msg(void __user *dest, struct msg_msg *msg, int len); | |
80 | ||
81 | #endif |