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// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package plugin implements loading and symbol resolution of Go plugins.
//
// A plugin is a Go main package with exported functions and variables that
// has been built with:
//
// go build -buildmode=plugin
//
// When a plugin is first opened, the init functions of all packages not
// already part of the program are called. The main function is not run.
// A plugin is only initialized once, and cannot be closed.
//
// The plugin support is currently incomplete, only supports Linux,
// and has known bugs. Please report any issues.
package plugin
// Plugin is a loaded Go plugin.
type Plugin struct {
pluginpath string
loaded chan struct{} // closed when loaded
syms map[string]interface{}
}
// Open opens a Go plugin.
// If a path has already been opened, then the existing *Plugin is returned.
// It is safe for concurrent use by multiple goroutines.
func Open(path string) (*Plugin, error) {
return open(path)
}
// Lookup searches for a symbol named symName in plugin p.
// A symbol is any exported variable or function.
// It reports an error if the symbol is not found.
// It is safe for concurrent use by multiple goroutines.
func (p *Plugin) Lookup(symName string) (Symbol, error) {
return lookup(p, symName)
}
// A Symbol is a pointer to a variable or function.
//
// For example, a plugin defined as
//
// package main
//
// import "fmt"
//
// var V int
//
// func F() { fmt.Printf("Hello, number %d\n", V) }
//
// may be loaded with the Open function and then the exported package
// symbols V and F can be accessed
//
// p, err := plugin.Open("plugin_name.so")
// if err != nil {
// panic(err)
// }
// v, err := p.Lookup("V")
// if err != nil {
// panic(err)
// }
// f, err := p.Lookup("F")
// if err != nil {
// panic(err)
// }
// *v.(*int) = 7
// f.(func())() // prints "Hello, number 7"
type Symbol interface{}
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