Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/ipc/util.h
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Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
File MIME type: text/plain
File size: 2363 byte(s)
Tag kernel26-2.6.12-alx-r9
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 |