| // 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 aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris |
| |
| // Package fdtest provides test helpers for working with file descriptors across exec. |
| package fdtest |
| |
| import ( |
| "syscall" |
| ) |
| |
| // Exists returns true if fd is a valid file descriptor. |
| func Exists(fd uintptr) bool { |
| var s syscall.Stat_t |
| err := syscall.Fstat(int(fd), &s) |
| return err != syscall.EBADF |
| } |