simple 动态链接库加载函数

//gcc -o test main.c -ldl
#include <stdio.h>
#include <string.h>
#include <dlfcn.h>

typedef long (*fLogin)(char *sUserName, char *sPassword);
typedef int (*ffoo)(char* buf, int len);
fLogin a = NULL;
ffoo b = NULL;

struct _s
{
    unsigned* p;
    char* fname;
} tmp[] =
{
    {(unsigned*)&a, "howtoLoging"},
    {(unsigned*)&b, "testfoo"}
};

int main(int argc, char* argv[])
{
    void* flib = NULL;
    const char* serror = NULL;
    int i = 0;

    flib = dlopen("testso.so", RTLD_NOW);
    if(!flib)
    {
        printf("open lib testso.so fail:%sn", dlerror());
        return -1;
    }

    for(i = 0; i < sizeof(tmp)/sizeof(struct _s);i++)
    {
        *tmp[i].p = (unsigned)dlsym(flib, tmp[i].fname);
        if ((serror = dlerror()) != NULL)
        {
            printf("load %s fail:%s n", tmp[i].fname, serror);
            dlclose(flib);
            return -1;
        }
    }

    a("admin", "123");
    b("hello", strlen("hello"));

    return 0;
}

//gcc -shared -o testso.so testso.c
#include <stdio.h>

long  howtoLoging(char *sUserName, char *sPassword, int a)
{
    printf("uname:%s, pass:%sn", sUserName, sPassword);
    return (long)a;
}

int testfoo(char* buf, int len)
{
    printf("len(%d):%cn", len, buf[0])    ;
    return len;
}