Source file src/os/exec/internal/fdtest/exists_plan9.go

     1  // Copyright 2021 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build plan9
     6  
     7  package fdtest
     8  
     9  import (
    10  	"syscall"
    11  )
    12  
    13  const errBadFd = syscall.ErrorString("fd out of range or not open")
    14  
    15  // Exists returns true if fd is a valid file descriptor.
    16  func Exists(fd uintptr) bool {
    17  	var buf [1]byte
    18  	_, err := syscall.Fstat(int(fd), buf[:])
    19  	return err != errBadFd
    20  }
    21  

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