1/* Reentrant function to return the current login name. Hurd version.
2 Copyright (C) 1996-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <errno.h>
20#include <unistd.h>
21#include <hurd.h>
22#include <string.h>
23
24/* Return at most NAME_LEN characters of the login name of the user in NAME.
25 If it cannot be determined or some other error occurred, return the error
26 code. Otherwise return 0. */
27int
28__getlogin_r (char *name, size_t name_len)
29{
30 string_t login;
31 error_t err;
32
33 if (err = __USEPORT (PROC, __proc_getlogin (port, login)))
34 return errno = err;
35
36 size_t len = __strnlen (login, sizeof login - 1) + 1;
37 if (len > name_len)
38 {
39 errno = ERANGE;
40 return errno;
41 }
42
43 memcpy (name, login, len);
44 return 0;
45}
46libc_hidden_def (__getlogin_r)
47weak_alias (__getlogin_r, getlogin_r)
48libc_hidden_weak (getlogin_r)
49

source code of glibc/sysdeps/mach/hurd/getlogin_r.c