golang调用c动态库

简介

golang调用c语言动态库，动态方式调用，可指定动态库路径，无需系统目录下

核心技术点

  • 封装c动态库
  • go语言调用c代码

实例代码

int test_so_func(int a,int b);

#include "test_so.h"                                                                                               

int test_so_func(int a,int b)
{
return a*b;
}

/*
#include "loadso.h"
#cgo LDFLAGS: -ldl
*/
import "C" 
import "fmt"

func main() {
    fmt.Println("20*30=", C.do_test_so_func(20, 30))
}
  • loadso.h
int do_test_so_func(int a,int b);
  • loadso.c
#include "loadso.h"                                                                                                                                    
#include <dlfcn.h>

char dllname[]= "/root/test_so.so";

int do_test_so_func(int a,int b)
{
    void* handle;
    typedef int (*FPTR)(int,int);

    handle = dlopen(dllname, 1);
    if(handle == 0){
       return -1; 
    }

    FPTR fptr = (FPTR)dlsym(handle, "test_so_func");

    int result = (*fptr)(a,b);
    return result;
}

关联知识

nm -D *.do
# nm -D libhi.so 
0000000000201028 B __bss_start
                 w __cxa_finalize
000000000000063d T Echo
0000000000201028 D _edata
0000000000201030 B _end
0000000000000658 T _fini
                 w __gmon_start__
000000000000062a T hi
0000000000000500 T _init
                 w _ITM_deregisterTMCloneTable
                 w _ITM_registerTMCloneTable
                 U puts

引文