ia64/linux-2.6.18-xen.hg

view ipc/util.h @ 647:a5bb490065f6

Fix the build after public header sync.
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Wed Aug 13 14:01:49 2008 +0100 (2008-08-13)
parents 831230e53067
children
line source
1 /*
2 * linux/ipc/util.h
3 * Copyright (C) 1999 Christoph Rohland
4 *
5 * ipc helper functions (c) 1999 Manfred Spraul <manfred@colorfullife.com>
6 */
8 #ifndef _IPC_UTIL_H
9 #define _IPC_UTIL_H
11 #define USHRT_MAX 0xffff
12 #define SEQ_MULTIPLIER (IPCMNI)
14 void sem_init (void);
15 void msg_init (void);
16 void shm_init (void);
18 struct ipc_id_ary {
19 int size;
20 struct kern_ipc_perm *p[0];
21 };
23 struct ipc_ids {
24 int in_use;
25 int max_id;
26 unsigned short seq;
27 unsigned short seq_max;
28 struct mutex mutex;
29 struct ipc_id_ary nullentry;
30 struct ipc_id_ary* entries;
31 };
33 struct seq_file;
34 void __init ipc_init_ids(struct ipc_ids* ids, int size);
35 #ifdef CONFIG_PROC_FS
36 void __init ipc_init_proc_interface(const char *path, const char *header,
37 struct ipc_ids *ids,
38 int (*show)(struct seq_file *, void *));
39 #else
40 #define ipc_init_proc_interface(path, header, ids, show) do {} while (0)
41 #endif
43 /* must be called with ids->mutex acquired.*/
44 int ipc_findkey(struct ipc_ids* ids, key_t key);
45 int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size);
47 /* must be called with both locks acquired. */
48 struct kern_ipc_perm* ipc_rmid(struct ipc_ids* ids, int id);
50 int ipcperms (struct kern_ipc_perm *ipcp, short flg);
52 /* for rare, potentially huge allocations.
53 * both function can sleep
54 */
55 void* ipc_alloc(int size);
56 void ipc_free(void* ptr, int size);
58 /*
59 * For allocation that need to be freed by RCU.
60 * Objects are reference counted, they start with reference count 1.
61 * getref increases the refcount, the putref call that reduces the recount
62 * to 0 schedules the rcu destruction. Caller must guarantee locking.
63 */
64 void* ipc_rcu_alloc(int size);
65 void ipc_rcu_getref(void *ptr);
66 void ipc_rcu_putref(void *ptr);
68 struct kern_ipc_perm* ipc_get(struct ipc_ids* ids, int id);
69 struct kern_ipc_perm* ipc_lock(struct ipc_ids* ids, int id);
70 void ipc_lock_by_ptr(struct kern_ipc_perm *ipcp);
71 void ipc_unlock(struct kern_ipc_perm* perm);
72 int ipc_buildid(struct ipc_ids* ids, int id, int seq);
73 int ipc_checkid(struct ipc_ids* ids, struct kern_ipc_perm* ipcp, int uid);
75 void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out);
76 void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out);
78 #if defined(__ia64__) || defined(__x86_64__) || defined(__hppa__) || defined(__XTENSA__)
79 /* On IA-64, we always use the "64-bit version" of the IPC structures. */
80 # define ipc_parse_version(cmd) IPC_64
81 #else
82 int ipc_parse_version (int *cmd);
83 #endif
85 extern void free_msg(struct msg_msg *msg);
86 extern struct msg_msg *load_msg(const void __user *src, int len);
87 extern int store_msg(void __user *dest, struct msg_msg *msg, int len);
89 #endif