3 * Copyright (C) 1999 Christoph Rohland
5 * ipc helper functions (c) 1999 Manfred Spraul <manfred@colorfullife.com>
6 * namespaces support. 2006 OpenVZ, SWsoft Inc.
7 * Pavel Emelianov <xemul@openvz.org>
13 #include <linux/idr.h>
15 #define USHRT_MAX 0xffff
16 #define SEQ_MULTIPLIER (IPCMNI)
22 int sem_init_ns(struct ipc_namespace *ns);
23 int msg_init_ns(struct ipc_namespace *ns);
24 int shm_init_ns(struct ipc_namespace *ns);
26 void sem_exit_ns(struct ipc_namespace *ns);
27 void msg_exit_ns(struct ipc_namespace *ns);
28 void shm_exit_ns(struct ipc_namespace *ns);
33 unsigned short seq_max;
40 void ipc_init_ids(struct ipc_ids *);
42 void __init ipc_init_proc_interface(const char *path, const char *header,
43 int ids, int (*show)(struct seq_file *, void *));
45 #define ipc_init_proc_interface(path, header, ids, show) do {} while (0)
52 /* must be called with ids->mutex acquired.*/
53 struct kern_ipc_perm *ipc_findkey(struct ipc_ids *ids, key_t key);
54 int ipc_addid(struct ipc_ids *, struct kern_ipc_perm *, int);
55 int ipc_get_maxid(struct ipc_ids *);
57 /* must be called with both locks acquired. */
58 void ipc_rmid(struct ipc_ids *, struct kern_ipc_perm *);
60 int ipcperms (struct kern_ipc_perm *ipcp, short flg);
62 /* for rare, potentially huge allocations.
63 * both function can sleep
65 void* ipc_alloc(int size);
66 void ipc_free(void* ptr, int size);
69 * For allocation that need to be freed by RCU.
70 * Objects are reference counted, they start with reference count 1.
71 * getref increases the refcount, the putref call that reduces the recount
72 * to 0 schedules the rcu destruction. Caller must guarantee locking.
74 void* ipc_rcu_alloc(int size);
75 void ipc_rcu_getref(void *ptr);
76 void ipc_rcu_putref(void *ptr);
78 struct kern_ipc_perm* ipc_get(struct ipc_ids* ids, int id);
79 struct kern_ipc_perm* ipc_lock(struct ipc_ids* ids, int id);
80 void ipc_lock_by_ptr(struct kern_ipc_perm *ipcp);
81 void ipc_unlock(struct kern_ipc_perm* perm);
82 int ipc_buildid(struct ipc_ids* ids, int id, int seq);
83 int ipc_checkid(struct ipc_ids* ids, struct kern_ipc_perm* ipcp, int uid);
85 void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out);
86 void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out);
88 #if defined(__ia64__) || defined(__x86_64__) || defined(__hppa__) || defined(__XTENSA__)
89 /* On IA-64, we always use the "64-bit version" of the IPC structures. */
90 # define ipc_parse_version(cmd) IPC_64
92 int ipc_parse_version (int *cmd);
95 extern void free_msg(struct msg_msg *msg);
96 extern struct msg_msg *load_msg(const void __user *src, int len);
97 extern int store_msg(void __user *dest, struct msg_msg *msg, int len);