rosapps/sysutils/dosfsck/io.h

   1 /* io.h  -  Virtual disk input/output */
   2
   3 /* Written 1993 by Werner Almesberger */
   4
   5 /* FAT32, VFAT, Atari format support, and various fixes additions May 1998
   6  * by Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de> */
   7
   8
   9 #ifndef _IO_H
  10 #define _IO_H
  11
  12 //#include <sys/types.h> /* for loff_t */
  13 #include "dosfsck.h"
  14
  15 /* In earlier versions, an own llseek() was used, but glibc lseek() is
  16  * sufficient (or even better :) for 64 bit offsets in the meantime */
  17 #define llseek lseek
  18
  19 void fs_open(char *path,int rw);
  20
  21 /* Opens the file system PATH. If RW is zero, the file system is opened
  22    read-only, otherwise, it is opened read-write. */
  23
  24 void fs_read(loff_t pos,int size,void *data);
  25
  26 /* Reads SIZE bytes starting at POS into DATA. Performs all applicable
  27    changes. */
  28
  29 int fs_test(loff_t pos,int size);
  30
  31 /* Returns a non-zero integer if SIZE bytes starting at POS can be read without
  32    errors. Otherwise, it returns zero. */
  33
  34 void fs_write(loff_t pos,int size,void *data);
  35
  36 /* If write_immed is non-zero, SIZE bytes are written from DATA to the disk,
  37    starting at POS. If write_immed is zero, the change is added to a list in
  38    memory. */
  39
  40 int fs_close(int write);
  41
  42 /* Closes the file system, performs all pending changes if WRITE is non-zero
  43    and removes the list of changes. Returns a non-zero integer if the file
  44    system has been changed since the last fs_open, zero otherwise. */
  45
  46 int fs_changed(void);
  47
  48 /* Determines whether the file system has changed. See fs_close. */
  49
  50 extern unsigned device_no;
  51
  52 /* Major number of device (0 if file) and size (in 512 byte sectors) */
  53
  54 #endif