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prenv.c
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00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is the Netscape Portable Runtime (NSPR).
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998-2000
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either the GNU General Public License Version 2 or later (the "GPL"), or
00026  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
00028  * of those above. If you wish to allow use of your version of this file only
00029  * under the terms of either the GPL or the LGPL, and not to allow others to
00030  * use your version of this file under the terms of the MPL, indicate your
00031  * decision by deleting the provisions above and replace them with the notice
00032  * and other provisions required by the GPL or the LGPL. If you do not delete
00033  * the provisions above, a recipient may use your version of this file under
00034  * the terms of any one of the MPL, the GPL or the LGPL.
00035  *
00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 #include <string.h>
00039 #include "primpl.h"
00040 
00041 /* Lock used to lock the environment */
00042 #if defined(_PR_NO_PREEMPT)
00043 #define _PR_NEW_LOCK_ENV()
00044 #define _PR_DELETE_LOCK_ENV()
00045 #define _PR_LOCK_ENV()
00046 #define _PR_UNLOCK_ENV()
00047 #elif defined(_PR_LOCAL_THREADS_ONLY)
00048 extern _PRCPU * _pr_primordialCPU;
00049 static PRIntn _is;
00050 #define _PR_NEW_LOCK_ENV()
00051 #define _PR_DELETE_LOCK_ENV()
00052 #define _PR_LOCK_ENV() if (_pr_primordialCPU) _PR_INTSOFF(_is);
00053 #define _PR_UNLOCK_ENV() if (_pr_primordialCPU) _PR_INTSON(_is);
00054 #else
00055 static PRLock *_pr_envLock = NULL;
00056 #define _PR_NEW_LOCK_ENV() {_pr_envLock = PR_NewLock();}
00057 #define _PR_DELETE_LOCK_ENV() \
00058     { if (_pr_envLock) { PR_DestroyLock(_pr_envLock); _pr_envLock = NULL; } }
00059 #define _PR_LOCK_ENV() { if (_pr_envLock) PR_Lock(_pr_envLock); }
00060 #define _PR_UNLOCK_ENV() { if (_pr_envLock) PR_Unlock(_pr_envLock); }
00061 #endif
00062 
00063 /************************************************************************/
00064 
00065 void _PR_InitEnv(void)
00066 {
00067        _PR_NEW_LOCK_ENV();
00068 }
00069 
00070 void _PR_CleanupEnv(void)
00071 {
00072     _PR_DELETE_LOCK_ENV();
00073 }
00074 
00075 PR_IMPLEMENT(char*) PR_GetEnv(const char *var)
00076 {
00077     char *ev;
00078 
00079     if (!_pr_initialized) _PR_ImplicitInitialization();
00080 
00081     _PR_LOCK_ENV();
00082     ev = _PR_MD_GET_ENV(var);
00083     _PR_UNLOCK_ENV();
00084     return ev;
00085 }
00086 
00087 PR_IMPLEMENT(PRStatus) PR_SetEnv(const char *string)
00088 {
00089     PRIntn result;
00090 
00091     if (!_pr_initialized) _PR_ImplicitInitialization();
00092 
00093     if ( !strchr(string, '=')) return(PR_FAILURE);
00094 
00095     _PR_LOCK_ENV();
00096     result = _PR_MD_PUT_ENV(string);
00097     _PR_UNLOCK_ENV();
00098     return (result)? PR_FAILURE : PR_SUCCESS;
00099 }
00100 
00101 /*
00102 ** DEPRECATED.  Use PR_SetEnv() instead.
00103 */
00104 #ifdef XP_MAC
00105 PR_IMPLEMENT(PRIntn) PR_PutEnv(const char *string)
00106 {
00107     return (PR_SetEnv(string) == PR_SUCCESS) ? PR_TRUE : PR_FALSE;
00108 }
00109 #endif