mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 05:48:40 +00:00
![Nadia Derbey](/assets/img/avatar_default.png)
This patch introduces a change into the sys_msgget(), sys_semget() and sys_shmget() routines: they now share a common code, which is better for maintainability. Signed-off-by: Nadia Derbey <Nadia.Derbey@bull.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
140 lines
4.2 KiB
C
140 lines
4.2 KiB
C
/*
|
|
* linux/ipc/util.h
|
|
* Copyright (C) 1999 Christoph Rohland
|
|
*
|
|
* ipc helper functions (c) 1999 Manfred Spraul <manfred@colorfullife.com>
|
|
* namespaces support. 2006 OpenVZ, SWsoft Inc.
|
|
* Pavel Emelianov <xemul@openvz.org>
|
|
*/
|
|
|
|
#ifndef _IPC_UTIL_H
|
|
#define _IPC_UTIL_H
|
|
|
|
#include <linux/idr.h>
|
|
|
|
#define USHRT_MAX 0xffff
|
|
#define SEQ_MULTIPLIER (IPCMNI)
|
|
|
|
void sem_init (void);
|
|
void msg_init (void);
|
|
void shm_init (void);
|
|
|
|
int sem_init_ns(struct ipc_namespace *ns);
|
|
int msg_init_ns(struct ipc_namespace *ns);
|
|
int shm_init_ns(struct ipc_namespace *ns);
|
|
|
|
void sem_exit_ns(struct ipc_namespace *ns);
|
|
void msg_exit_ns(struct ipc_namespace *ns);
|
|
void shm_exit_ns(struct ipc_namespace *ns);
|
|
|
|
struct ipc_ids {
|
|
int in_use;
|
|
unsigned short seq;
|
|
unsigned short seq_max;
|
|
struct mutex mutex;
|
|
struct idr ipcs_idr;
|
|
};
|
|
|
|
/*
|
|
* 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
|
|
* . routine to call to call to check permissions for a new ipc object.
|
|
* 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 *);
|
|
int (*associate) (void *, int);
|
|
int (*more_checks) (void *, struct ipc_params *);
|
|
};
|
|
|
|
struct seq_file;
|
|
|
|
void ipc_init_ids(struct ipc_ids *);
|
|
#ifdef CONFIG_PROC_FS
|
|
void __init ipc_init_proc_interface(const char *path, const char *header,
|
|
int ids, int (*show)(struct seq_file *, void *));
|
|
#else
|
|
#define ipc_init_proc_interface(path, header, ids, show) do {} while (0)
|
|
#endif
|
|
|
|
#define IPC_SEM_IDS 0
|
|
#define IPC_MSG_IDS 1
|
|
#define IPC_SHM_IDS 2
|
|
|
|
/* must be called with ids->mutex acquired.*/
|
|
int ipc_addid(struct ipc_ids *, struct kern_ipc_perm *, int);
|
|
int ipc_get_maxid(struct ipc_ids *);
|
|
|
|
/* must be called with both locks acquired. */
|
|
void ipc_rmid(struct ipc_ids *, struct kern_ipc_perm *);
|
|
|
|
int ipcperms (struct kern_ipc_perm *ipcp, short flg);
|
|
|
|
/* 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);
|
|
|
|
struct kern_ipc_perm* ipc_get(struct ipc_ids* ids, int id);
|
|
struct kern_ipc_perm* ipc_lock(struct ipc_ids* ids, int id);
|
|
void ipc_lock_by_ptr(struct kern_ipc_perm *ipcp);
|
|
void ipc_unlock(struct kern_ipc_perm* perm);
|
|
int ipc_buildid(struct ipc_ids* ids, int id, int seq);
|
|
int ipc_checkid(struct ipc_ids* ids, struct kern_ipc_perm* ipcp, int uid);
|
|
|
|
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);
|
|
|
|
#if defined(__ia64__) || defined(__x86_64__) || defined(__hppa__) || defined(__XTENSA__)
|
|
/* 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);
|
|
extern int ipcget_new(struct ipc_namespace *, struct ipc_ids *,
|
|
struct ipc_ops *, struct ipc_params *);
|
|
extern int ipcget_public(struct ipc_namespace *, struct ipc_ids *,
|
|
struct ipc_ops *, struct ipc_params *);
|
|
|
|
static inline int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,
|
|
struct ipc_ops *ops, struct ipc_params *params)
|
|
{
|
|
if (params->key == IPC_PRIVATE)
|
|
return ipcget_new(ns, ids, ops, params);
|
|
else
|
|
return ipcget_public(ns, ids, ops, params);
|
|
}
|
|
|
|
#endif
|