go libgo2 源码
golang libgo2 代码
文件路径：/misc/cgo/testcshared/testdata/libgo2/libgo2.go
// Copyright 2015 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.
// +build darwin dragonfly freebsd linux netbsd openbsd solaris
package main
// Test a shared library created by -buildmode=c-shared that does not
// export anything.
import (
"fmt"
"os"
"syscall"
)
// To test this we want to communicate between the main program and
// the shared library without using any exported symbols. The init
// function creates a pipe and Dups the read end to a known number
// that the C code can also use.
const (
fd = 30
)
func init() {
var p [2]int
if e := syscall.Pipe(p[0:]); e != nil {
fmt.Fprintf(os.Stderr, "pipe: %v\n", e)
os.Exit(2)
}
if e := dup2(p[0], fd); e != nil {
fmt.Fprintf(os.Stderr, "dup2: %v\n", e)
os.Exit(2)
}
const str = "PASS"
if n, e := syscall.Write(p[1], []byte(str)); e != nil || n != len(str) {
fmt.Fprintf(os.Stderr, "write: %d %v\n", n, e)
os.Exit(2)
}
if e := syscall.Close(p[1]); e != nil {
fmt.Fprintf(os.Stderr, "close: %v\n", e)
os.Exit(2)
}
}
func main() {
}
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