go exists_plan9 源码
golang exists_plan9 代码
文件路径：/src/os/exec/internal/fdtest/exists_plan9.go
// Copyright 2021 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.
//go:build plan9
package fdtest
import (
"syscall"
)
const errBadFd = syscall.ErrorString("fd out of range or not open")
// Exists returns true if fd is a valid file descriptor.
func Exists(fd uintptr) bool {
var buf [1]byte
_, err := syscall.Fstat(int(fd), buf[:])
return err != errBadFd
}
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