1 /* Copyright (C) 1992,1995-1999,2000-2002,2005-2007 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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 of the License, or
7 (at your option) any later version.
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.
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/>. */
24 # define __set_errno(ev) ((errno) = (ev))
31 # define __environ environ
32 # ifndef HAVE_ENVIRON_DECL
33 extern char **environ;
38 /* This lock protects against simultaneous modifications of `environ'. */
39 # include <bits/libc-lock.h>
40 __libc_lock_define_initialized (static, envlock)
41 # define LOCK __libc_lock_lock (envlock)
42 # define UNLOCK __libc_lock_unlock (envlock)
48 /* In the GNU C library we must keep the namespace clean. */
50 # define unsetenv __unsetenv
55 unsetenv (const char *name)
60 if (name == NULL || *name == '\0' || strchr (name, '=') != NULL)
72 if (!strncmp (*ep, name, len) && (*ep)[len] == '=')
74 /* Found it. Remove this pointer by moving later ones back. */
80 /* Continue the loop in case NAME appears again. */
92 weak_alias (__unsetenv, unsetenv)