2020-12-23 C语言动态打开so库

最新推荐文章于 2024-05-01 10:06:58 发布

洗尽沉滓

最新推荐文章于 2024-05-01 10:06:58 发布

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分类专栏： linux系列文章标签： c语言 linux

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#include <stdio.h>
#include <dlfcn.h>

//编译so库文件：gcc jaccard.c -I . -shared -fPIC -o libjaccard.so

int load_so(char* path, char* so)
{
    //加载指定位置的so动态库
	int ret = 100;
	int rate = 0;
    char so_path[128] = {'\0'};
    snprintf(so_path, sizeof(so_path), "%s%s", path, so);

    printf("open so(%s) is %s\n", so, so_path);

    void* so_handle = dlopen(so_path, RTLD_LAZY);
    if (NULL != so_handle) {
		printf("NOT NULL open so(%s) is %s\n", so, so_path);
		int (*test_calculate)(int ret); //test_calculate的函数原型需要和calculate保持一致
		//根据动态链接库操作句柄与符号，返回符号对应的地址
		test_calculate = dlsym(so_handle, "calculate"); //calculate 为libjaccard.so中的具体的函数名
		if (NULL == test_calculate) {
			netmon_fuzzy_match_debug("[ERROR]func is NULL\n");
		} else {
			rate = test_calculate(ret);
			printf("NULL open so(%s) is %s\n", so, so_path);
		}
        return rate;
    } else {
		printf("NULL open so(%s) is %s\n", so, so_path);
		return 0;
    }
}

int main()
{
	load_so("/usr/lib64/", "libjaccard.so");
	return 0;
}