3 * Copyright (C) 1999 Christoph Rohland
5 * ipc helper functions (c) 1999 Manfred Spraul <manfreds@colorfullife.com>
11 #define USHRT_MAX 0xffff
12 #define SEQ_MULTIPLIER (IPCMNI)
23 unsigned short seq_max;
25 struct ipc_id* entries;
29 struct kern_ipc_perm* p;
32 void __init ipc_init_ids(struct ipc_ids* ids, int size);
34 /* must be called with ids->sem acquired.*/
35 int ipc_findkey(struct ipc_ids* ids, key_t key);
36 int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size);
38 /* must be called with both locks acquired. */
39 struct kern_ipc_perm* ipc_rmid(struct ipc_ids* ids, int id);
41 int ipcperms (struct kern_ipc_perm *ipcp, short flg);
43 /* for rare, potentially huge allocations.
44 * both function can sleep
46 void* ipc_alloc(int size);
47 void ipc_free(void* ptr, int size);
48 /* for allocation that need to be freed by RCU
49 * both function can sleep
51 void* ipc_rcu_alloc(int size);
52 void ipc_rcu_free(void* arg, int size);
54 struct kern_ipc_perm* ipc_get(struct ipc_ids* ids, int id);
55 struct kern_ipc_perm* ipc_lock(struct ipc_ids* ids, int id);
56 void ipc_unlock(struct kern_ipc_perm* perm);
57 int ipc_buildid(struct ipc_ids* ids, int id, int seq);
58 int ipc_checkid(struct ipc_ids* ids, struct kern_ipc_perm* ipcp, int uid);
60 void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out);
61 void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out);
63 #if defined(__ia64__) || defined(__x86_64__) || defined(__hppa__)
64 /* On IA-64, we always use the "64-bit version" of the IPC structures. */
65 # define ipc_parse_version(cmd) IPC_64
67 int ipc_parse_version (int *cmd);
70 extern void free_msg(struct msg_msg *msg);
71 extern struct msg_msg *load_msg(void __user *src, int len);
72 extern int store_msg(void __user *dest, struct msg_msg *msg, int len);