]>
git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - ipc/util.h
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)
20 struct kern_ipc_perm
*p
[0];
27 unsigned short seq_max
;
29 struct ipc_id_ary nullentry
;
30 struct ipc_id_ary
* entries
;
33 void __init
ipc_init_ids(struct ipc_ids
* ids
, int size
);
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
);
39 /* must be called with both locks acquired. */
40 struct kern_ipc_perm
* ipc_rmid(struct ipc_ids
* ids
, int id
);
42 int ipcperms (struct kern_ipc_perm
*ipcp
, short flg
);
44 /* for rare, potentially huge allocations.
45 * both function can sleep
47 void* ipc_alloc(int size
);
48 void ipc_free(void* ptr
, int size
);
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.
56 void* ipc_rcu_alloc(int size
);
57 void ipc_rcu_getref(void *ptr
);
58 void ipc_rcu_putref(void *ptr
);
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
);
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
);
70 #if defined(__ia64__) || defined(__x86_64__) || defined(__hppa__) || defined(__XTENSA__)
71 /* On IA-64, we always use the "64-bit version" of the IPC structures. */
72 # define ipc_parse_version(cmd) IPC_64
74 int ipc_parse_version (int *cmd
);
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
);