rt-thread/components/libc/libdl/dlopen.c

65 lines
1.3 KiB
C

/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2010-11-17 yi.qiu first version
*/
#include <rtthread.h>
#include <rtm.h>
#include <string.h>
#include "dlmodule.h"
#define MODULE_ROOT_DIR "/modules"
void* dlopen(const char *filename, int flags)
{
struct rt_dlmodule *module;
char *fullpath;
const char*def_path = MODULE_ROOT_DIR;
/* check parameters */
RT_ASSERT(filename != RT_NULL);
if (filename[0] != '/') /* it's a relative path, prefix with MODULE_ROOT_DIR */
{
fullpath = rt_malloc(strlen(def_path) + strlen(filename) + 2);
/* join path and file name */
rt_snprintf(fullpath, strlen(def_path) + strlen(filename) + 2,
"%s/%s", def_path, filename);
}
else
{
fullpath = (char*)filename; /* absolute path, use it directly */
}
rt_enter_critical();
/* find in module list */
module = dlmodule_find(fullpath);
if(module != RT_NULL)
{
rt_exit_critical();
module->nref++;
}
else
{
rt_exit_critical();
module = dlmodule_load(fullpath);
}
if(fullpath != filename)
{
rt_free(fullpath);
}
return (void*)module;
}
RTM_EXPORT(dlopen);