linux动态加载so

sudo echo "/path/to/library" >> /etc/ld.so.conf
sudo ldconfig

export LD_LIBRARY_PATH=/path/to/library:$LD_LIBRARY_PATH

ldd your_program

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

int main() {
    void *handle;
    char *(*say_hello)(void);

    // 动态加载共享库
    handle = dlopen("./libhello.so", RTLD_LAZY);
    if (!handle) {
        fprintf(stderr, "%s\n", dlerror());
        return 1;
    }

    // 获取共享库中的函数
    say_hello = dlsym(handle, "say_hello");
    const char *dlsym_error = dlerror();
    if (dlsym_error) {
        fprintf(stderr, "%s\n", dlsym_error);
        dlclose(handle);
        return 1;
    }

    // 调用共享库中的函数
    printf("%s\n", say_hello());

    // 关闭共享库
    dlclose(handle);
    return 0;
}

#include <stdio.h>

char *say_hello() {
    return "Hello, World!";
}

gcc -shared -o libhello.so libhello.c

gcc -o main main.c -ldl

./main