/* * henv.c * * $Id: henv.c,v 1.1.1.1 2002/04/08 22:48:10 miner Exp $ * * Environment object management functions * * The iODBC driver manager. * * Copyright (C) 1995 by Ke Jin <kejin@empress.com> * Copyright (C) 1996-2002 by OpenLink Software <iodbc@openlinksw.com> * All Rights Reserved. * * This software is released under the terms of either of the following * licenses: * * - GNU Library General Public License (see LICENSE.LGPL) * - The BSD License (see LICENSE.BSD). * * While not mandated by the BSD license, any patches you make to the * iODBC source code may be contributed back into the iODBC project * at your discretion. Contributions will benefit the Open Source and * Data Access community as a whole. Submissions may be made at: * * http://www.iodbc.org * * * GNU Library Generic Public License Version 2 * ============================================ * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the Free * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * * The BSD License * =============== * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name of OpenLink Software Inc. nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL OPENLINK OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include <iodbc.h> #include <sql.h> #include <sqlext.h> #include <dlproc.h> #include <herr.h> #include <henv.h> #include <itrace.h> /* * Use static initializer where possible */ #if defined (PTHREAD_MUTEX_INITIALIZER) SPINLOCK_DECLARE (iodbcdm_global_lock) = PTHREAD_MUTEX_INITIALIZER; #else SPINLOCK_DECLARE (iodbcdm_global_lock); #endif static int _iodbcdm_initialized = 0; static void Init_iODBC(); static void Done_iODBC(); SQLRETURN SQL_API SQLAllocEnv (SQLHENV FAR * phenv) { GENV_t FAR *genv; /* * One time initialization */ if (!_iodbcdm_initialized) Init_iODBC(); genv = (GENV_t *) MEM_ALLOC (sizeof (GENV_t)); if (genv == NULL) { *phenv = SQL_NULL_HENV; return SQL_ERROR; } genv->rc = 0; /* * Initialize this handle */ genv->type = SQL_HANDLE_ENV; genv->henv = SQL_NULL_HENV; /* driver's env list */ genv->hdbc = SQL_NULL_HDBC; /* driver's dbc list */ genv->herr = SQL_NULL_HERR; /* err list */ #if (ODBCVER >= 0x300) genv->odbc_ver = SQL_OV_ODBC2; #endif genv->err_rec = 0; *phenv = (SQLHENV) genv; return SQL_SUCCESS; } SQLRETURN SQL_API SQLFreeEnv (SQLHENV henv) { GENV (genv, henv); ODBC_LOCK(); if (!IS_VALID_HENV (genv)) { ODBC_UNLOCK(); return SQL_INVALID_HANDLE; } CLEAR_ERRORS (genv); if (genv->hdbc != SQL_NULL_HDBC) { PUSHSQLERR (genv->herr, en_S1010); ODBC_UNLOCK(); return SQL_ERROR; } /* * Invalidate this handle */ genv->type = 0; MEM_FREE (genv); ODBC_UNLOCK(); return SQL_SUCCESS; } /* * Initialize the system and let everyone wait until we have done so * properly */ static void Init_iODBC () { #if !defined (PTHREAD_MUTEX_INITIALIZER) || defined (WINDOWS) SPINLOCK_INIT (iodbcdm_global_lock); #endif SPINLOCK_LOCK (iodbcdm_global_lock); if (!_iodbcdm_initialized) { /* * Other one time initializations can be performed here */ /* * OK, now flag we are not callable anymore and return */ _iodbcdm_initialized = 1; } SPINLOCK_UNLOCK (iodbcdm_global_lock); return; } static void Done_iODBC() { SPINLOCK_DONE (iodbcdm_global_lock); } /* * DLL Entry points for Windows */ #if defined (WINDOWS) STATIC int DLLInit (HINSTANCE hModule) { Init_iODBC (); return TRUE; } STATIC void DLLExit (void) { Done_iODBC (); } #pragma argused BOOL WINAPI DllMain (HINSTANCE hModule, DWORD fdReason, LPVOID lpvReserved) { switch (fdReason) { case DLL_PROCESS_ATTACH: if (!DLLInit (hModule)) return FALSE; break; case DLL_PROCESS_DETACH: DLLExit (); } return TRUE; } #endif