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golang 生成 shared object 供其他语言使用
LINUX so 文件基本概念和命名规则
libxmns.so.1.2.3 1 major 2 minor 3 release
major 增加，原有函数接口已经不能使用，minor 和 release 复归于 0
minor 增加，新增加了一些函数接口，但原有函数接口还能使用，release 复归于 0
release 增加，修改一些 bug, 函数接口不变
c-go
模板 - 供 c、java 等编译型语言或脚本语言使用
package main
import “C”
import “fmt”
//export Sum
func Sum(a int, b int) int {
return a + b
}
//export GetName
func GetName(firstName string) string{
return fmt.Sprint(firstName,”-so”)
}
func main(){
}
注意，即使是要编译成动态库，也要有 main 函数，上面的 import “C” 一定要有 而且一定要有注释
编译
go build -buildmode=c-shared -o libhello.so .\libhello.go
使用 lua 脚本语言调用
使用到的库：lua2go
luajit 环境变量配置
export LUA_PATH=”~/?.lua;;”
export LUAJIT_LIB=/usr/local/openresty/luajit/lib
export LUAJIT_INC=/usr/local/openresty/luajit/include/luajit-2.1
export LUAJIT_HOME=/usr/local/openresty/luajit
PATH=$PATH:$LUAJIT_HOME/bin
export PATH
调用 demo
local lua2go = require(‘lua2go’)
local example = lua2go.Load(‘./libvibrant.so’)
lua2go.Externs[[
extern GoInt32 Sum(GoInt32 a,GoInt32 b);
]]
print(example.Sum(1,100))
调用测试
luajit test_go.lua
plug 模式
1、golang 1.8+ 支持 2、只支持 golang
模板
package main
import (
“fmt”
)
func DCall(){
fmt.Println(“plugin.so was called”)
}
func DCallWithParam(msg string){
fmt.Println(“ 参数内容为:”,msg)
}
func main() {
fmt.Println(“goroute 全部退出 ”)
}
编译
go build –buildmode=plugin plugin.go
使用
package main
import (
“plugin”
)
func main() {
// 加载动态库
p, err := plugin.Open(“plugin.so”)
if err != nil {
panic(err)
}
// 查找函数
f, err := p.Lookup(“DCall”)
if err != nil {
panic(err)
}
// 转换类型后调用函数
f.(func())()
f2, err := p.Lookup(“DCallWithParam”)
if err != nil {
panic(err)
}
// 带参函数的调用
f2.(func(string))(“hello world,plugin.so”)
}
go buildmode 说明
The ‘go build’ and ‘go install’ commands take a -buildmode argument which
indicates which kind of object file is to be built. Currently supported values
are:
-buildmode=archive
Build the listed non-main packages into .a files. Packages named
main are ignored.
-buildmode=c-archive
Build the listed main package, plus all packages it imports,
into a C archive file. The only callable symbols will be those
functions exported using a cgo //export comment. Requires
exactly one main package to be listed.
-buildmode=c-shared
Build the listed main package, plus all packages it imports,
into a C shared library. The only callable symbols will
be those functions exported using a cgo //export comment.
Requires exactly one main package to be listed.
-buildmode=default
Listed main packages are built into executables and listed
non-main packages are built into .a files (the default
behavior).
-buildmode=shared
Combine all the listed non-main packages into a single shared
library that will be used when building with the -linkshared
option. Packages named main are ignored.
-buildmode=exe
Build the listed main packages and everything they import into
executables. Packages not named main are ignored.
-buildmode=pie
Build the listed main packages and everything they import into
position independent executables (PIE). Packages not named
main are ignored.
-buildmode=plugin
Build the listed main packages, plus all packages that they
import, into a Go plugin. Packages not named main are ignored.