mirror of
https://git.kernel.org/pub/scm/bluetooth/bluez.git
synced 2024-11-29 23:24:20 +08:00
48a962ec6d
This makes haltest and android-tester to load bluetooth.default.so instead of linking directly to it.
125 lines
3.3 KiB
C
125 lines
3.3 KiB
C
/*
|
|
* Copyright (C) 2008 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#include <hardware/hardware.h>
|
|
|
|
#include <dlfcn.h>
|
|
#include <string.h>
|
|
#include <pthread.h>
|
|
#include <errno.h>
|
|
#include <limits.h>
|
|
#include <stdio.h>
|
|
|
|
#define LOG_TAG "HAL"
|
|
|
|
#define LOG_INFO " I"
|
|
#define LOG_WARN " W"
|
|
#define LOG_ERROR " E"
|
|
#define LOG_DEBUG " D"
|
|
#define ALOG(pri, tag, fmt, arg...) fprintf(stderr, tag pri": " fmt"\n", ##arg)
|
|
|
|
#define info(fmt, arg...) ALOG(LOG_INFO, LOG_TAG, fmt, ##arg)
|
|
#define warn(fmt, arg...) ALOG(LOG_WARN, LOG_TAG, fmt, ##arg)
|
|
#define error(fmt, arg...) ALOG(LOG_ERROR, LOG_TAG, fmt, ##arg)
|
|
|
|
/**
|
|
* Load the file defined by the variant and if successful
|
|
* return the dlopen handle and the hmi.
|
|
* @return 0 = success, !0 = failure.
|
|
*/
|
|
static int load(const char *id,
|
|
const char *path,
|
|
const struct hw_module_t **pHmi)
|
|
{
|
|
int status;
|
|
void *handle;
|
|
struct hw_module_t *hmi;
|
|
const char *sym = HAL_MODULE_INFO_SYM_AS_STR;
|
|
|
|
/*
|
|
* load the symbols resolving undefined symbols before
|
|
* dlopen returns. Since RTLD_GLOBAL is not or'd in with
|
|
* RTLD_NOW the external symbols will not be global
|
|
*/
|
|
handle = dlopen(path, RTLD_NOW);
|
|
if (handle == NULL) {
|
|
char const *err_str = dlerror();
|
|
error("load: module=%s\n%s", path, err_str?err_str:"unknown");
|
|
status = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
/* Get the address of the struct hal_module_info. */
|
|
hmi = (struct hw_module_t *)dlsym(handle, sym);
|
|
if (hmi == NULL) {
|
|
error("load: couldn't find symbol %s", sym);
|
|
status = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
/* Check that the id matches */
|
|
if (strcmp(id, hmi->id) != 0) {
|
|
error("load: id=%s != hmi->id=%s", id, hmi->id);
|
|
status = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
hmi->dso = handle;
|
|
|
|
*pHmi = hmi;
|
|
|
|
info("loaded HAL id=%s path=%s hmi=%p handle=%p",
|
|
id, path, *pHmi, handle);
|
|
|
|
return 0;
|
|
|
|
done:
|
|
hmi = NULL;
|
|
if (handle != NULL) {
|
|
dlclose(handle);
|
|
handle = NULL;
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
int hw_get_module_by_class(const char *class_id, const char *inst,
|
|
const struct hw_module_t **module)
|
|
{
|
|
char path[PATH_MAX];
|
|
char name[PATH_MAX];
|
|
|
|
if (inst)
|
|
snprintf(name, PATH_MAX, "%s.%s", class_id, inst);
|
|
else
|
|
snprintf(name, PATH_MAX, "%s", class_id);
|
|
|
|
/*
|
|
* Here we rely on the fact that calling dlopen multiple times on
|
|
* the same .so will simply increment a refcount (and not load
|
|
* a new copy of the library).
|
|
* We also assume that dlopen() is thread-safe.
|
|
*/
|
|
snprintf(path, sizeof(path), "%s/%s.default.so", PLUGINDIR, name);
|
|
|
|
return load(class_id, path, module);
|
|
}
|
|
|
|
int hw_get_module(const char *id, const struct hw_module_t **module)
|
|
{
|
|
return hw_get_module_by_class(id, NULL, module);
|
|
}
|