1// Copyright 2018 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
5package os
6
7import "syscall"
8
9// gethostname syscall cannot be used because it also returns the domain.
10// Therefore, hostname is retrieve with uname syscall and the Nodename field.
11
12func hostname() (name string, err error) {
13	var u syscall.Utsname
14	if errno := syscall.Uname(&u); errno != nil {
15		return "", NewSyscallError("uname", errno)
16	}
17	b := make([]byte, len(u.Nodename))
18	i := 0
19	for ; i < len(u.Nodename); i++ {
20		if u.Nodename[i] == 0 {
21			break
22		}
23		b[i] = byte(u.Nodename[i])
24	}
25	return string(b[:i]), nil
26}
27