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

/*
 * File      : dlopen.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006 - 2010, RT-Thread Development Team
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.rt-thread.org/license/LICENSE
 *
 * Change Logs:
 * Date           Author		Notes
 * 2010-11-17      yi.qiu	first version
 */
 
#include <rtthread.h>
#include <rtm.h>
#include <string.h>

#define MODULE_ROOT_DIR		"/module/lib"

void* dlopen(const char *filename, int flags)
{
	rt_module_t 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 */
	}	

	/* find in module list */
	module = rt_module_find(fullpath);
	
	if(module != RT_NULL) module->nref++;
	else module = rt_module_open(fullpath);

	if(fullpath != filename)
	{
		rt_free(fullpath);
	}

	return (void*)module;
}

RTM_EXPORT(dlopen)