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| Current File : //usr/src/lib/libc/include/nscache.h |
/*-
* Copyright (c) 2005 Michael Bushkov <bushman@rsu.ru>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD: release/9.1.0/lib/libc/include/nscache.h 158115 2006-04-28 12:03:38Z ume $
*/
#ifndef __NS_CACHE_H__
#define __NS_CACHE_H__
#include "nscachedcli.h"
typedef int (*nss_cache_id_func_t)(char *, size_t *, va_list, void *);
typedef int (*nss_cache_marshal_func_t)(char *, size_t *, void *, va_list,
void *);
typedef int (*nss_cache_unmarshal_func_t)(char *, size_t, void *, va_list,
void *);
typedef void (*nss_set_mp_ws_func_t)(cached_mp_write_session);
typedef cached_mp_write_session (*nss_get_mp_ws_func_t)(void);
typedef void (*nss_set_mp_rs_func_t)(cached_mp_read_session);
typedef cached_mp_read_session (*nss_get_mp_rs_func_t)(void);
typedef struct _nss_cache_info {
char *entry_name;
void *mdata;
/*
* These 3 functions should be implemented specifically for each
* nsswitch database.
*/
nss_cache_id_func_t id_func; /* marshals the request parameters */
nss_cache_marshal_func_t marshal_func; /* marshals response */
nss_cache_unmarshal_func_t unmarshal_func; /* unmarshals response */
/*
* These 4 functions should be generated with NSS_MP_CACHE_HANDLING
* macro.
*/
nss_set_mp_ws_func_t set_mp_ws_func; /* sets current write session */
nss_get_mp_ws_func_t get_mp_ws_func; /* gets current write session */
nss_set_mp_rs_func_t set_mp_rs_func; /* sets current read session */
nss_get_mp_rs_func_t get_mp_rs_func; /* gets current read session */
} nss_cache_info;
/*
* NSS_MP_CACHE_HANDLING implements the set_mp_ws, get_mp_ws, set_mp_rs,
* get_mp_rs functions, that are used in _nss_cache_info. It uses
* NSS_TLS_HANDLING macro to organize thread local storage.
*/
#define NSS_MP_CACHE_HANDLING(name) \
struct name##_mp_state { \
cached_mp_write_session mp_write_session; \
cached_mp_read_session mp_read_session; \
}; \
\
static void \
name##_mp_endstate(void *s) { \
struct name##_mp_state *mp_state; \
\
mp_state = (struct name##_mp_state *)s; \
if (mp_state->mp_write_session != INVALID_CACHED_MP_WRITE_SESSION)\
__abandon_cached_mp_write_session(mp_state->mp_write_session);\
\
if (mp_state->mp_read_session != INVALID_CACHED_MP_READ_SESSION)\
__close_cached_mp_read_session(mp_state->mp_read_session);\
} \
NSS_TLS_HANDLING(name##_mp); \
\
static void \
name##_set_mp_ws(cached_mp_write_session ws) \
{ \
struct name##_mp_state *mp_state; \
int res; \
\
res = name##_mp_getstate(&mp_state); \
if (res != 0) \
return; \
\
mp_state->mp_write_session = ws; \
} \
\
static cached_mp_write_session \
name##_get_mp_ws(void) \
{ \
struct name##_mp_state *mp_state; \
int res; \
\
res = name##_mp_getstate(&mp_state); \
if (res != 0) \
return (INVALID_CACHED_MP_WRITE_SESSION); \
\
return (mp_state->mp_write_session); \
} \
\
static void \
name##_set_mp_rs(cached_mp_read_session rs) \
{ \
struct name##_mp_state *mp_state; \
int res; \
\
res = name##_mp_getstate(&mp_state); \
if (res != 0) \
return; \
\
mp_state->mp_read_session = rs; \
} \
\
static cached_mp_read_session \
name##_get_mp_rs(void) \
{ \
struct name##_mp_state *mp_state; \
int res; \
\
res = name##_mp_getstate(&mp_state); \
if (res != 0) \
return (INVALID_CACHED_MP_READ_SESSION); \
\
return (mp_state->mp_read_session); \
}
/*
* These macros should be used to initialize _nss_cache_info structure. For
* multipart queries in setXXXent and getXXXent functions mf and uf
* (marshal function and unmarshal function) should be both NULL.
*/
#define NS_COMMON_CACHE_INFO_INITIALIZER(name, mdata, if, mf, uf) \
{#name, mdata, if, mf, uf, NULL, NULL, NULL, NULL}
#define NS_MP_CACHE_INFO_INITIALIZER(name, mdata, mf, uf) \
{#name, mdata, NULL, mf, uf, name##_set_mp_ws, name##_get_mp_ws,\
name##_set_mp_rs, name##_get_mp_rs }
/*
* Analog of other XXX_CB macros. Has the pointer to _nss_cache_info
* structure as the only argument.
*/
#define NS_CACHE_CB(cinfo) {NSSRC_CACHE, __nss_cache_handler, (void *)(cinfo) },
/* args are: current pointer, current buffer, initial buffer, pointer type */
#define NS_APPLY_OFFSET(cp, cb, ib, p_type) \
if ((cp) != NULL) \
(cp) = (p_type)((char *)(cb) + (size_t)(cp) - (size_t)(ib))
/*
* Gets new pointer from the marshalled buffer by uisng initial address
* and initial buffer address
*/
#define NS_GET_NEWP(cp, cb, ib) \
((char *)(cb) + (size_t)(cp) - (size_t)(ib))
typedef struct _nss_cache_data {
char *key;
size_t key_size;
nss_cache_info const *info;
} nss_cache_data;
__BEGIN_DECLS
/* dummy function, which is needed to make nss_method_lookup happy */
extern int __nss_cache_handler(void *, void *, va_list);
#ifdef _NS_PRIVATE
extern int __nss_common_cache_read(void *, void *, va_list);
extern int __nss_common_cache_write(void *, void *, va_list);
extern int __nss_common_cache_write_negative(void *);
extern int __nss_mp_cache_read(void *, void *, va_list);
extern int __nss_mp_cache_write(void *, void *, va_list);
extern int __nss_mp_cache_write_submit(void *, void *, va_list);
extern int __nss_mp_cache_end(void *, void *, va_list);
#endif /* _NS_PRIVATE */
__END_DECLS
#endif