sysdeps/unix/sysv/linux/getlogin.c

   1 /* Copyright (C) 2010-2019 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <pwd.h>
  19 #include <unistd.h>
  20 #include <not-cancel.h>
  21
  22 #define STATIC static
  23 #define getlogin getlogin_fd0
  24 #include <sysdeps/unix/getlogin.c>
  25 #undef getlogin
  26
  27
  28 /* Return the login name of the user, or NULL if it can't be determined.
  29    The returned pointer, if not NULL, is good only until the next call.  */
  30
  31 char *
  32 getlogin (void)
  33 {
  34   int res = __getlogin_r_loginuid (name, sizeof (name));
  35   if (res >= 0)
  36     return res == 0 ? name : NULL;
  37
  38   return getlogin_fd0 ();
  39 }