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 27 #ifndef _IO_H 28 #define _IO_H 29 30 #include <sys/types.h> /* for loff_t */ 31 32 /* In earlier versions, an own llseek() was used, but glibc lseek() is 33 * sufficient (or even better :) for 64 bit offsets in the meantime */ 34 #define llseek lseek64 35 36 void fs_open(char *path,int rw); 37 38 /* Opens the file system PATH. If RW is zero, the file system is opened 39 read-only, otherwise, it is opened read-write. */ 40 41 void fs_read(loff_t pos,int size,void *data); 42 43 /* Reads SIZE bytes starting at POS into DATA. Performs all applicable 44 changes. */ 45 46 int fs_test(loff_t pos,int size); 47 48 /* Returns a non-zero integer if SIZE bytes starting at POS can be read without 49 errors. Otherwise, it returns zero. */ 50 51 void fs_write(loff_t pos,int size,void *data); 52 53 /* If write_immed is non-zero, SIZE bytes are written from DATA to the disk, 54 starting at POS. If write_immed is zero, the change is added to a list in 55 memory. */ 56 57 int fs_close(int write); 58 59 /* Closes the file system, performs all pending changes if WRITE is non-zero 60 and removes the list of changes. Returns a non-zero integer if the file 61 system has been changed since the last fs_open, zero otherwise. */ 62 63 int fs_changed(void); 64 65 /* Determines whether the file system has changed. See fs_close. */ 66 67 extern unsigned device_no; 68 69 /* Major number of device (0 if file) and size (in 512 byte sectors) */ 70 71 #endif 72