dummyblk.c (820B)
1 #include <os9/os9.h> 2 3 #include "../src/libc/syscall.h" 4 #include "dev.h" 5 #include "blk.h" 6 7 /* 8 * A block file filled with zeros can be created with: 9 * dd bs=512 count=2 if=/dev/zero of=blkfile 10 */ 11 12 void 13 dummyblkinit(Blk *dev, Attr *attr) 14 { 15 static char filename[] = "blkfile"; 16 int fd; 17 18 if ((fd = _open(filename, 0x2)) < 0) 19 panic("blkinit"); 20 dev->data = alloc(sizeof(fd)); 21 *(int *)dev->data = fd; 22 } 23 24 int 25 dummyblkbread(Blk *dev, long blkno, void *buf) 26 { 27 int fd; 28 29 fd = *(int *) dev->data; 30 _lseek(fd, blkno * BLKSIZ, 0); 31 return _read(fd, buf, BLKSIZ); 32 } 33 34 int 35 dummyblkbwrite(Blk *dev, long blkno, void *buf) 36 { 37 int fd; 38 39 fd = *(int *) dev->data; 40 _lseek(fd, blkno * BLKSIZ, 0); 41 return _write(fd, buf, BLKSIZ); 42 } 43 44 Blkphy dummyblkphy = { 45 .init = dummyblkinit, 46 .bread = dummyblkbread, 47 .bwrite = dummyblkbwrite 48 };