| 1 | /* global.c - The external variables needed for "original" interface and
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| 2 | error messages. */
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| 3 |
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| 4 | /* This file is part of GDBM, the GNU data base manager, by Philip A. Nelson.
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| 5 | Copyright (C) 1990, 1991, 1993 Free Software Foundation, Inc.
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| 6 |
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| 7 | GDBM is free software; you can redistribute it and/or modify
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| 8 | it under the terms of the GNU General Public License as published by
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| 9 | the Free Software Foundation; either version 2, or (at your option)
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| 10 | any later version.
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| 11 |
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| 12 | GDBM is distributed in the hope that it will be useful,
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | GNU General Public License for more details.
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| 16 |
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| 17 | You should have received a copy of the GNU General Public License
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| 18 | along with GDBM; see the file COPYING. If not, write to
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| 19 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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| 20 |
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| 21 | You may contact the author by:
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| 22 | e-mail: [email protected]
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| 23 | us-mail: Philip A. Nelson
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| 24 | Computer Science Department
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| 25 | Western Washington University
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| 26 | Bellingham, WA 98226
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| 27 |
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| 28 | *************************************************************************/
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| 29 |
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| 30 |
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| 31 | /* include system configuration before all else. */
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| 32 | #include "autoconf.h"
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| 33 |
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| 34 | #include "gdbmdefs.h"
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| 35 | #include "gdbmerrno.h"
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| 36 |
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| 37 |
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| 38 | /* The global variables used for the "original" interface. */
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| 39 | gdbm_file_info *_gdbm_file = NULL;
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| 40 |
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| 41 | /* Memory for return data for the "original" interface. */
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| 42 | datum _gdbm_memory = {NULL, 0}; /* Used by firstkey and nextkey. */
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| 43 | char *_gdbm_fetch_val = NULL; /* Used by fetch. */
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| 44 |
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| 45 | /* The dbm error number is placed in the variable GDBM_ERRNO. */
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| 46 | gdbm_error gdbm_errno = GDBM_NO_ERROR;
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| 47 |
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| 48 | #ifdef MSDOS
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| 49 |
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| 50 | #include <io.h>
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| 51 | #include <windows.h>
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| 52 |
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| 53 | /* a simple locking function for windows that uses file descriptors */
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| 54 | int my_locking(int fh, int lmode, long lockoffset, long nbytes) {
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| 55 | int result = -1;
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| 56 | int trys = 10;
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| 57 |
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| 58 | lseek (fh, lockoffset, L_SET);
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| 59 |
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| 60 | while (trys > 0 && result != 0) {
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| 61 | if (lmode == MY_UNLOCK) {
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| 62 | if (UnlockFile((HANDLE)_get_osfhandle(fh),lockoffset,0,nbytes,0))
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| 63 | result = 0;
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| 64 |
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| 65 | } else if (lmode == MY_READLOCK) {
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| 66 | /* if (LockFileEx((HANDLE)_get_osfhandle(fh),0,0,nbytes,0,0))*/
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| 67 | if (LockFile((HANDLE)_get_osfhandle(fh),lockoffset,0,nbytes,0))
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| 68 | result = 0;
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| 69 |
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| 70 | } else if (lmode == MY_WRITELOCK) {
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| 71 | if (LockFile((HANDLE)_get_osfhandle(fh),lockoffset,0,nbytes,0))
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| 72 | result = 0;
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| 73 | }
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| 74 |
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| 75 | Sleep(100L);
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| 76 | trys--;
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| 77 | }
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| 78 |
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| 79 | return result;
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| 80 | }
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| 81 |
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| 82 | #endif
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