918c07021f
This change makes the code symmetrical and ensures the lock not to be aquired recursively. The problem that the lock is tried to be aquired recursively was pointed out by Matthias Drochner.
403 lines
8.4 KiB
C
403 lines
8.4 KiB
C
/* $NetBSD: citrus_mapper.c,v 1.4 2003/07/02 17:48:57 tshiozak Exp $ */
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/*-
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* Copyright (c)2003 Citrus Project,
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: citrus_mapper.c,v 1.4 2003/07/02 17:48:57 tshiozak Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include "reentrant.h"
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <limits.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/queue.h>
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#include "citrus_namespace.h"
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#include "citrus_types.h"
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#include "citrus_region.h"
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#include "citrus_memstream.h"
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#include "citrus_bcs.h"
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#include "citrus_mmap.h"
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#include "citrus_module.h"
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#include "citrus_hash.h"
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#include "citrus_mapper.h"
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#define _CITRUS_MAPPER_DIR "mapper.dir"
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#define CM_HASH_SIZE 101
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#define REFCOUNT_PERSISTENT -1
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#ifdef _REENTRANT
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static rwlock_t lock = RWLOCK_INITIALIZER;
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#endif
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struct _citrus_mapper_area {
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_CITRUS_HASH_HEAD(, _citrus_mapper, CM_HASH_SIZE) ma_cache;
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char *ma_dir;
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};
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/*
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* _citrus_mapper_create_area:
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* create mapper area
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*/
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int
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_citrus_mapper_create_area(
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struct _citrus_mapper_area *__restrict *__restrict rma,
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const char *__restrict area)
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{
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struct stat st;
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int ret;
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char path[PATH_MAX];
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struct _citrus_mapper_area *ma;
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rwlock_wrlock(&lock);
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if (*rma != NULL) {
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ret = 0;
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goto quit;
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}
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snprintf(path, PATH_MAX, "%s/%s", area, _CITRUS_MAPPER_DIR);
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ret = stat(path, &st);
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if (ret)
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goto quit;
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ma = malloc(sizeof(*ma));
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if (ma == NULL) {
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ret = errno;
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goto quit;
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}
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ma->ma_dir = strdup(area);
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if (ma->ma_dir == NULL) {
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ret = errno;
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free(ma->ma_dir);
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goto quit;
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}
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_CITRUS_HASH_INIT(&ma->ma_cache, CM_HASH_SIZE);
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*rma = ma;
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ret = 0;
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quit:
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rwlock_unlock(&lock);
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return ret;
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}
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/*
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* lookup_mapper_entry:
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* lookup mapper.dir entry in the specified directory.
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*
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* line format of iconv.dir file:
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* mapper module arg
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* mapper : mapper name.
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* module : mapper module name.
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* arg : argument for the module (generally, description file name)
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*/
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static int
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lookup_mapper_entry(const char *dir, const char *mapname,
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void *linebuf, size_t linebufsize,
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const char **module, const char **variable)
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{
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struct _region r;
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struct _memstream ms;
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int ret;
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const char *cp, *cq;
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char *p;
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size_t len;
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char path[PATH_MAX];
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/* create mapper.dir path */
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snprintf(path, PATH_MAX, "%s/%s", dir, _CITRUS_MAPPER_DIR);
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/* open read stream */
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ret = _map_file(&r, path);
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if (ret)
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return ret;
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_memstream_bind(&ms, &r);
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/* search the line matching to the map name */
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cp = _memstream_matchline(&ms, mapname, &len, 0);
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if (!cp) {
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ret = ENOENT;
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goto quit;
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}
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if (!len || len>linebufsize-1) {
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ret = EINVAL;
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goto quit;
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}
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p = linebuf;
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/* get module name */
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*module = p;
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cq = _bcs_skip_nonws_len(cp, &len);
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strlcpy(p, cp, (size_t)(cq-cp+1));
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p += cq-cp+1;
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/* get variable */
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*variable = p;
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cp = _bcs_skip_ws_len(cq, &len);
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strlcpy(p, cp, len+1);
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ret = 0;
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quit:
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_unmap_file(&r);
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return ret;
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}
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/*
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* mapper_close:
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* simply close a mapper. (without handling hash)
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*/
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static void
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mapper_close(struct _citrus_mapper *cm)
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{
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if (cm->cm_module) {
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if (cm->cm_ops) {
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if (cm->cm_closure)
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(*cm->cm_ops->mo_uninit)(cm);
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free(cm->cm_ops);
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}
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_citrus_unload_module(cm->cm_module);
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}
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free(cm->cm_traits);
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free(cm);
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}
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/*
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* mapper_open:
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* simply open a mapper. (without handling hash)
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*/
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static int
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mapper_open(struct _citrus_mapper_area *__restrict ma,
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struct _citrus_mapper * __restrict * __restrict rcm,
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const char * __restrict module,
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const char * __restrict variable)
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{
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int ret;
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struct _citrus_mapper *cm;
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_citrus_mapper_getops_t getops;
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/* initialize mapper handle */
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cm = malloc(sizeof(*cm));
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if (!cm)
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return errno;
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cm->cm_module = NULL;
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cm->cm_ops = NULL;
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cm->cm_closure = NULL;
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cm->cm_traits = NULL;
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cm->cm_refcount = 0;
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cm->cm_key = NULL;
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/* load module */
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ret = _citrus_load_module(&cm->cm_module, module);
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if (ret)
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goto err;
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/* get operators */
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getops = (_citrus_mapper_getops_t)
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_citrus_find_getops(cm->cm_module, module, "mapper");
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if (!getops) {
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ret = EOPNOTSUPP;
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goto err;
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}
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cm->cm_ops = malloc(sizeof(*cm->cm_ops));
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if (!cm->cm_ops) {
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ret = errno;
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goto err;
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}
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ret = (*getops)(cm->cm_ops, sizeof(*cm->cm_ops),
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_CITRUS_MAPPER_ABI_VERSION);
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if (ret)
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goto err;
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if (!cm->cm_ops->mo_init ||
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!cm->cm_ops->mo_uninit ||
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!cm->cm_ops->mo_convert ||
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!cm->cm_ops->mo_init_state)
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goto err;
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/* allocate traits structure */
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cm->cm_traits = malloc(sizeof(*cm->cm_traits));
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if (cm->cm_traits == NULL) {
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ret = errno;
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goto err;
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}
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/* initialize the mapper */
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ret = (*cm->cm_ops->mo_init)(ma, cm, ma->ma_dir,
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(const void *)variable,
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strlen(variable)+1,
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cm->cm_traits, sizeof(*cm->cm_traits));
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if (ret)
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goto err;
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*rcm = cm;
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return 0;
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err:
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mapper_close(cm);
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return ret;
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}
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/*
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* _citrus_mapper_open_direct:
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* open a mapper.
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*/
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int
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_citrus_mapper_open_direct(struct _citrus_mapper_area *__restrict ma,
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struct _citrus_mapper * __restrict * __restrict rcm,
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const char * __restrict module,
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const char * __restrict variable)
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{
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return mapper_open(ma, rcm, module, variable);
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}
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/*
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* hash_func
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*/
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static __inline int
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hash_func(const char *key)
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{
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return _string_hash_func(key, CM_HASH_SIZE);
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}
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/*
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* match_func
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*/
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static __inline int
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match_func(struct _citrus_mapper *cm, const char *key)
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{
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return strcmp(cm->cm_key, key);
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}
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/*
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* _citrus_mapper_open:
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* open a mapper with looking up "mapper.dir".
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*/
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int
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_citrus_mapper_open(struct _citrus_mapper_area *__restrict ma,
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struct _citrus_mapper * __restrict * __restrict rcm,
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const char * __restrict mapname)
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{
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int ret;
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char linebuf[PATH_MAX];
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const char *module, *variable;
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struct _citrus_mapper *cm;
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int hashval;
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rwlock_wrlock(&lock);
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/* search in the cache */
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hashval = hash_func(mapname);
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_CITRUS_HASH_SEARCH(&ma->ma_cache, cm, cm_entry, match_func, mapname,
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hashval);
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if (cm) {
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/* found */
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cm->cm_refcount++;
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*rcm = cm;
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ret = 0;
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goto quit;
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}
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/* search mapper entry */
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ret = lookup_mapper_entry(ma->ma_dir, mapname, linebuf, PATH_MAX,
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&module, &variable);
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if (ret)
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goto quit;
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/* open mapper */
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ret = mapper_open(ma, &cm, module, variable);
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if (ret)
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goto quit;
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cm->cm_key = strdup(mapname);
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if (cm->cm_key == NULL) {
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ret = errno;
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rwlock_unlock(&lock);
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_mapper_close(cm);
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return ret;
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}
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/* insert to the cache */
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cm->cm_refcount = 1;
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_CITRUS_HASH_INSERT(&ma->ma_cache, cm, cm_entry, hashval);
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*rcm = cm;
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ret = 0;
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quit:
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rwlock_unlock(&lock);
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return ret;
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}
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/*
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* _citrus_mapper_close:
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* close the specified mapper.
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*/
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void
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_citrus_mapper_close(struct _citrus_mapper *cm)
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{
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if (cm) {
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rwlock_wrlock(&lock);
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if (cm->cm_refcount == REFCOUNT_PERSISTENT)
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goto quit;
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if (cm->cm_refcount > 0) {
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if (--cm->cm_refcount > 0)
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goto quit;
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_CITRUS_HASH_REMOVE(cm, cm_entry);
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free(cm->cm_key);
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}
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mapper_close(cm);
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quit:
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rwlock_unlock(&lock);
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}
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}
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/*
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* _citrus_mapper_set_persistent:
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* set persistent count.
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*/
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void
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_citrus_mapper_set_persistent(struct _citrus_mapper * __restrict cm)
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{
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rwlock_wrlock(&lock);
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cm->cm_refcount = REFCOUNT_PERSISTENT;
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rwlock_unlock(&lock);
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}
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