Update copyright dates with scripts/update-copyrights.

[thirdparty/glibc.git] / sysdeps / mach / hurd / getlogin_r.c

/* Reentrant function to return the current login name.  Hurd version.
   Copyright (C) 1996-2017 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <errno.h>
#include <unistd.h>
#include <hurd.h>
#include <string.h>

/* Return at most NAME_LEN characters of the login name of the user in NAME.
   If it cannot be determined or some other error occurred, return the error
   code.  Otherwise return 0.  */
int
__getlogin_r (char *name, size_t name_len)
{
  string_t login;
  error_t err;

  if (err = __USEPORT (PROC, __proc_getlogin (port, login)))
    return errno = err;

  size_t len = __strnlen (login, sizeof login - 1) + 1;
  if (len > name_len)
    {
      errno = ERANGE;
      return errno;
    }

  memcpy (name, login, len);
  return 0;
}
libc_hidden_def (__getlogin_r)
weak_alias (__getlogin_r, getlogin_r)
libc_hidden_weak (getlogin_r)