Blame view
ipc/util.h
4.47 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 |
/* * linux/ipc/util.h * Copyright (C) 1999 Christoph Rohland * |
624dffcbc correct email add... |
5 |
* ipc helper functions (c) 1999 Manfred Spraul <manfred@colorfullife.com> |
73ea41302 [PATCH] IPC names... |
6 7 |
* namespaces support. 2006 OpenVZ, SWsoft Inc. * Pavel Emelianov <xemul@openvz.org> |
1da177e4c Linux-2.6.12-rc2 |
8 9 10 11 |
*/ #ifndef _IPC_UTIL_H #define _IPC_UTIL_H |
023a53557 ipc: integrate ip... |
12 |
#include <linux/err.h> |
7ca7e564e ipc: store ipcs i... |
13 |
|
1da177e4c Linux-2.6.12-rc2 |
14 15 16 17 18 |
#define SEQ_MULTIPLIER (IPCMNI) void sem_init (void); void msg_init (void); void shm_init (void); |
ae5e1b22f namespaces: move ... |
19 |
struct ipc_namespace; |
ed2ddbf88 IPC: make struct ... |
20 21 22 |
void sem_init_ns(struct ipc_namespace *ns); void msg_init_ns(struct ipc_namespace *ns); void shm_init_ns(struct ipc_namespace *ns); |
73ea41302 [PATCH] IPC names... |
23 24 25 26 |
void sem_exit_ns(struct ipc_namespace *ns); void msg_exit_ns(struct ipc_namespace *ns); void shm_exit_ns(struct ipc_namespace *ns); |
7748dbfaa ipc: unify the sy... |
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 |
/* * Structure that holds the parameters needed by the ipc operations * (see after) */ struct ipc_params { key_t key; int flg; union { size_t size; /* for shared memories */ int nsems; /* for semaphores */ } u; /* holds the getnew() specific param */ }; /* * Structure that holds some ipc operations. This structure is used to unify * the calls to sys_msgget(), sys_semget(), sys_shmget() * . routine to call to create a new ipc object. Can be one of newque, * newary, newseg |
f4566f048 ipc: fix wrong co... |
45 |
* . routine to call to check permissions for a new ipc object. |
7748dbfaa ipc: unify the sy... |
46 47 48 49 50 51 |
* Can be one of security_msg_associate, security_sem_associate, * security_shm_associate * . routine to call for an extra check if needed */ struct ipc_ops { int (*getnew) (struct ipc_namespace *, struct ipc_params *); |
03f02c765 Storing ipcs into... |
52 53 |
int (*associate) (struct kern_ipc_perm *, int); int (*more_checks) (struct kern_ipc_perm *, struct ipc_params *); |
7748dbfaa ipc: unify the sy... |
54 |
}; |
ae7817745 [PATCH] ipc: add ... |
55 |
struct seq_file; |
ed2ddbf88 IPC: make struct ... |
56 |
struct ipc_ids; |
7d69a1f4a remove CONFIG_UTS... |
57 |
|
7ca7e564e ipc: store ipcs i... |
58 |
void ipc_init_ids(struct ipc_ids *); |
ae7817745 [PATCH] ipc: add ... |
59 60 |
#ifdef CONFIG_PROC_FS void __init ipc_init_proc_interface(const char *path, const char *header, |
73ea41302 [PATCH] IPC names... |
61 |
int ids, int (*show)(struct seq_file *, void *)); |
ae7817745 [PATCH] ipc: add ... |
62 63 64 |
#else #define ipc_init_proc_interface(path, header, ids, show) do {} while (0) #endif |
1da177e4c Linux-2.6.12-rc2 |
65 |
|
73ea41302 [PATCH] IPC names... |
66 67 68 |
#define IPC_SEM_IDS 0 #define IPC_MSG_IDS 1 #define IPC_SHM_IDS 2 |
ce621f5ba ipc: introduce th... |
69 |
#define ipcid_to_idx(id) ((id) % SEQ_MULTIPLIER) |
3e148c799 fix idr_find() lo... |
70 |
/* must be called with ids->rw_mutex acquired for writing */ |
7ca7e564e ipc: store ipcs i... |
71 |
int ipc_addid(struct ipc_ids *, struct kern_ipc_perm *, int); |
3e148c799 fix idr_find() lo... |
72 73 |
/* must be called with ids->rw_mutex acquired for reading */ |
7ca7e564e ipc: store ipcs i... |
74 |
int ipc_get_maxid(struct ipc_ids *); |
1da177e4c Linux-2.6.12-rc2 |
75 76 |
/* must be called with both locks acquired. */ |
7ca7e564e ipc: store ipcs i... |
77 |
void ipc_rmid(struct ipc_ids *, struct kern_ipc_perm *); |
1da177e4c Linux-2.6.12-rc2 |
78 |
|
f4566f048 ipc: fix wrong co... |
79 80 |
/* must be called with ipcp locked */ int ipcperms(struct kern_ipc_perm *ipcp, short flg); |
1da177e4c Linux-2.6.12-rc2 |
81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 |
/* for rare, potentially huge allocations. * both function can sleep */ void* ipc_alloc(int size); void ipc_free(void* ptr, int size); /* * For allocation that need to be freed by RCU. * Objects are reference counted, they start with reference count 1. * getref increases the refcount, the putref call that reduces the recount * to 0 schedules the rcu destruction. Caller must guarantee locking. */ void* ipc_rcu_alloc(int size); void ipc_rcu_getref(void *ptr); void ipc_rcu_putref(void *ptr); |
023a53557 ipc: integrate ip... |
97 |
struct kern_ipc_perm *ipc_lock(struct ipc_ids *, int); |
1da177e4c Linux-2.6.12-rc2 |
98 99 100 |
void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out); void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out); |
8f4a3809c IPC: introduce ip... |
101 |
void ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out); |
a5f75e7f2 IPC: consolidate ... |
102 103 |
struct kern_ipc_perm *ipcctl_pre_down(struct ipc_ids *ids, int id, int cmd, struct ipc64_perm *perm, int extra_perm); |
1da177e4c Linux-2.6.12-rc2 |
104 |
|
813e67836 [PATCH] xtensa: r... |
105 |
#if defined(__ia64__) || defined(__x86_64__) || defined(__hppa__) || defined(__XTENSA__) |
1da177e4c Linux-2.6.12-rc2 |
106 107 108 109 110 111 112 113 114 |
/* On IA-64, we always use the "64-bit version" of the IPC structures. */ # define ipc_parse_version(cmd) IPC_64 #else int ipc_parse_version (int *cmd); #endif extern void free_msg(struct msg_msg *msg); extern struct msg_msg *load_msg(const void __user *src, int len); extern int store_msg(void __user *dest, struct msg_msg *msg, int len); |
7748dbfaa ipc: unify the sy... |
115 |
|
b6b337ad1 ipc: recompute ms... |
116 |
extern void recompute_msgmni(struct ipc_namespace *); |
1b531f213 ipc: remove unnee... |
117 |
static inline int ipc_buildid(int id, int seq) |
280283131 ipc: inline ipc_b... |
118 119 120 |
{ return SEQ_MULTIPLIER * seq + id; } |
f4566f048 ipc: fix wrong co... |
121 122 123 |
/* * Must be called with ipcp locked */ |
1b531f213 ipc: remove unnee... |
124 |
static inline int ipc_checkid(struct kern_ipc_perm *ipcp, int uid) |
023a53557 ipc: integrate ip... |
125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 |
{ if (uid / SEQ_MULTIPLIER != ipcp->seq) return 1; return 0; } static inline void ipc_lock_by_ptr(struct kern_ipc_perm *perm) { rcu_read_lock(); spin_lock(&perm->lock); } static inline void ipc_unlock(struct kern_ipc_perm *perm) { spin_unlock(&perm->lock); rcu_read_unlock(); } |
b2d75cddc ipc: uninline som... |
142 143 144 |
struct kern_ipc_perm *ipc_lock_check(struct ipc_ids *ids, int id); int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids, struct ipc_ops *ops, struct ipc_params *params); |
1da177e4c Linux-2.6.12-rc2 |
145 146 |
#endif |