| bigbiff bigbiff | 9c75405 | 2013-01-09 09:09:08 -0500 | [diff] [blame] | 1 | /* io.h - Virtual disk input/output |
| 2 | |
| 3 | Copyright (C) 1993 Werner Almesberger <werner.almesberger@lrc.di.epfl.ch> |
| 4 | Copyright (C) 1998 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de> |
| 5 | |
| 6 | This program is free software: you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation, either version 3 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 18 | |
| 19 | On Debian systems, the complete text of the GNU General Public License |
| 20 | can be found in /usr/share/common-licenses/GPL-3 file. |
| 21 | */ |
| 22 | |
| 23 | /* FAT32, VFAT, Atari format support, and various fixes additions May 1998 |
| 24 | * by Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de> */ |
| 25 | |
| 26 | #ifndef _IO_H |
| 27 | #define _IO_H |
| 28 | |
| 29 | #include <sys/types.h> /* for loff_t */ |
| 30 | |
| 31 | loff_t llseek(int fd, loff_t offset, int whence); |
| 32 | |
| 33 | /* lseek() analogue for large offsets. */ |
| 34 | |
| 35 | void fs_open(char *path, int rw); |
| 36 | |
| 37 | /* Opens the file system PATH. If RW is zero, the file system is opened |
| 38 | read-only, otherwise, it is opened read-write. */ |
| 39 | |
| 40 | void fs_read(loff_t pos, int size, void *data); |
| 41 | |
| 42 | /* Reads SIZE bytes starting at POS into DATA. Performs all applicable |
| 43 | changes. */ |
| 44 | |
| 45 | int fs_test(loff_t pos, int size); |
| 46 | |
| 47 | /* Returns a non-zero integer if SIZE bytes starting at POS can be read without |
| 48 | errors. Otherwise, it returns zero. */ |
| 49 | |
| 50 | void fs_write(loff_t pos, int size, void *data); |
| 51 | |
| 52 | /* If write_immed is non-zero, SIZE bytes are written from DATA to the disk, |
| 53 | starting at POS. If write_immed is zero, the change is added to a list in |
| 54 | memory. */ |
| 55 | |
| 56 | int fs_close(int write); |
| 57 | |
| 58 | /* Closes the file system, performs all pending changes if WRITE is non-zero |
| 59 | and removes the list of changes. Returns a non-zero integer if the file |
| 60 | system has been changed since the last fs_open, zero otherwise. */ |
| 61 | |
| 62 | int fs_changed(void); |
| 63 | |
| 64 | /* Determines whether the file system has changed. See fs_close. */ |
| 65 | |
| 66 | extern unsigned device_no; |
| 67 | |
| 68 | /* Major number of device (0 if file) and size (in 512 byte sectors) */ |
| 69 | |
| 70 | #endif |