gl/setenv.h

   1 /* Setting environment variables.
   2    Copyright (C) 2001-2004 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3, or (at your option)
   7    any later version.
   8
   9    This program 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
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, see <http://www.gnu.org/licenses/>.  */
  16
  17 #if HAVE_SETENV || HAVE_UNSETENV
  18
  19 /* Get setenv(), unsetenv() declarations.  */
  20 # include <stdlib.h>
  21
  22 #endif
  23
  24 #ifdef  __cplusplus
  25 extern "C" {
  26 #endif
  27
  28 #if !HAVE_SETENV
  29
  30 /* Set NAME to VALUE in the environment.
  31    If REPLACE is nonzero, overwrite an existing value.  */
  32 extern int setenv (const char *name, const char *value, int replace);
  33
  34 #endif
  35
  36 #if HAVE_UNSETENV
  37
  38 # if VOID_UNSETENV
  39 /* On some systems, unsetenv() returns void.
  40    This is the case for FreeBSD 4.8, NetBSD 1.6, OpenBSD 3.4.  */
  41 #  define unsetenv(name) ((unsetenv)(name), 0)
  42 # endif
  43
  44 #else
  45
  46 /* Remove the variable NAME from the environment.  */
  47 extern int unsetenv (const char *name);
  48
  49 #endif
  50
  51 #ifdef  __cplusplus
  52 }
  53 #endif