The Tor Browser: security/nss/lib/dbm/src/db.c@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /*-

     2  * Copyright (c) 1991, 1993

     3  *	The Regents of the University of California.  All rights reserved.

     4  *

     5  * Redistribution and use in source and binary forms, with or without

     6  * modification, are permitted provided that the following conditions

     7  * are met:

     8  * 1. Redistributions of source code must retain the above copyright

     9  *    notice, this list of conditions and the following disclaimer.

    10  * 2. Redistributions in binary form must reproduce the above copyright

    11  *    notice, this list of conditions and the following disclaimer in the

    12  *    documentation and/or other materials provided with the distribution.

    13  * 3. ***REMOVED*** - see

    14  *    ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change

    15  * 4. Neither the name of the University nor the names of its contributors

    16  *    may be used to endorse or promote products derived from this software

    17  *    without specific prior written permission.

    18  *

    19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

    20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

    22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

    23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

    24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

    25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

    26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

    27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

    28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

    29  * SUCH DAMAGE.

    30  */

    32 #if defined(LIBC_SCCS) && !defined(lint)

    33 static char sccsid[] = "@(#)db.c	8.4 (Berkeley) 2/21/94";

    34 #endif /* LIBC_SCCS and not lint */

    36 #ifndef __DBINTERFACE_PRIVATE

    37 #define __DBINTERFACE_PRIVATE

    38 #endif

    39 #ifdef macintosh

    40 #include <unix.h>

    41 #else

    42 #include <sys/types.h>

    43 #endif

    45 #include <errno.h>

    46 #include <fcntl.h>

    47 #include <stddef.h>

    48 #include <stdio.h>

    50 #include "mcom_db.h"

    52 /* a global flag that locks closed all databases */

    53 int all_databases_locked_closed = 0;

    55 /* set or unset a global lock flag to disable the

    56  * opening of any DBM file

    57  */

    58 void

    59 dbSetOrClearDBLock(DBLockFlagEnum type)

    60 {

    61 	if(type == LockOutDatabase)

    62 		all_databases_locked_closed = 1;

    63 	else

    64 		all_databases_locked_closed = 0;

    65 }

    67 DB *

    68 dbopen(const char *fname, int flags,int mode, DBTYPE type, const void *openinfo)

    69 {

    71 	/* lock out all file databases.  Let in-memory databases through

    72 	 */

    73 	if(all_databases_locked_closed && fname)

    74 	  {

    75 		errno = EINVAL;

    76 		return(NULL);

    77 	  }

    79 #define	DB_FLAGS	(DB_LOCK | DB_SHMEM | DB_TXN)

    82 #if 0  /* most systems don't have EXLOCK and SHLOCK */

    83 #define	USE_OPEN_FLAGS							\

    84 	(O_CREAT | O_EXCL | O_EXLOCK | O_NONBLOCK | O_RDONLY |		\

    85 	 O_RDWR | O_SHLOCK | O_TRUNC)

    86 #else

    87 #define	USE_OPEN_FLAGS							\

    88 	(O_CREAT | O_EXCL  | O_RDONLY |		\

    89 	 O_RDWR | O_TRUNC)

    90 #endif

    92 	if ((flags & ~(USE_OPEN_FLAGS | DB_FLAGS)) == 0)

    93 		switch (type) {

    94 /* we don't need btree and recno right now */

    95 #if 0

    96 		case DB_BTREE:

    97 			return (__bt_open(fname, flags & USE_OPEN_FLAGS,

    98 			    mode, openinfo, flags & DB_FLAGS));

    99 		case DB_RECNO:

   100 			return (__rec_open(fname, flags & USE_OPEN_FLAGS,

   101 			    mode, openinfo, flags & DB_FLAGS));

   102 #endif

   104 		case DB_HASH:

   105 			return (__hash_open(fname, flags & USE_OPEN_FLAGS,

   106 			    mode, (const HASHINFO *)openinfo, flags & DB_FLAGS));

   107 		default:

   108 			break;

   109 		}

   110 	errno = EINVAL;

   111 	return (NULL);

   112 }

   114 static int

   115 __dberr()

   116 {

   117 	return (RET_ERROR);

   118 }

   120 /*

   121  * __DBPANIC -- Stop.

   122  *

   123  * Parameters:

   124  *	dbp:	pointer to the DB structure.

   125  */

   126 void

   127 __dbpanic(DB *dbp)

   128 {

   129 	/* The only thing that can succeed is a close. */

   130 	dbp->del = (int (*)(const struct __db *, const DBT *, uint))__dberr;

   131 	dbp->fd = (int (*)(const struct __db *))__dberr;

   132 	dbp->get = (int (*)(const struct __db *, const DBT *, DBT *, uint))__dberr;

   133 	dbp->put = (int (*)(const struct __db *, DBT *, const DBT *, uint))__dberr;

   134 	dbp->seq = (int (*)(const struct __db *, DBT *, DBT *, uint))__dberr;

   135 	dbp->sync = (int (*)(const struct __db *, uint))__dberr;

   136 }

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