手动从动态库中加载函数接口

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

int main(int argc, char *argv[])
{
	int ret = 0;
	void *function;
	char *pzerror;
	char name[20] = {0};
	char soname[20] = {0};
	
	void (*test)(int, int);

	while ((ret = getopt(argc, argv, "n:s:")) != -1) {
				
		switch (ret) {
			case 'n':

				strcpy(name, optarg);
				printf("name = %s\n", name);

				break;

			case 's':

				strcpy(soname, optarg);
				printf("soname = %s\n", soname);

				break;

			default:
				printf("other option!");
		}

		printf("inx = %d, optopt = %c\n", optind, optopt);
	}

	function = dlopen(soname, RTLD_LAZY);
	if (function == NULL) {
		pzerror = dlerror();

		printf("open active.so faild!\n%s\n", pzerror);
		return -1;
	}

	test = dlsym(function, name);

	if (test == NULL) {
		pzerror = dlerror();

		printf("find hellowolrd symbol faild!\n%s\n", pzerror);
		return -1;
	}
	
	test(1, 2);

	printf("\033[0;32;31m""%s: %d \n""\033[m", __func__, __LINE__);
	dlclose(function);
	return 0;
}