blkdev.c (2380B)
1 /* $Id: //depot/blt/srv/vfs/sandbox/blkdev.c#1 $ 2 ** 3 ** Copyright 1999 Sidney Cammeresi 4 ** All rights reserved. 5 ** 6 ** Redistribution and use in source and binary forms, with or without 7 ** modification, are permitted provided that the following conditions 8 ** are met: 9 ** 1. Redistributions of source code must retain the above copyright 10 ** notice, this list of conditions, and the following disclaimer. 11 ** 2. Redistributions in binary form must reproduce the above copyright 12 ** notice, this list of conditions, and the following disclaimer in the 13 ** documentation and/or other materials provided with the distribution. 14 ** 3. The name of the author may not be used to endorse or promote products 15 ** derived from this software without specific prior written permission. 16 ** 17 ** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 ** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 ** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 ** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 ** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 ** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 ** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <stdlib.h> 30 #include <fcntl.h> 31 #include <unistd.h> 32 #include <sys/stat.h> 33 #include <sys/types.h> 34 #include "blkdev.h" 35 36 int blk_open (const char *name, int flags, blkdev_t **retdev) 37 { 38 int fd; 39 struct stat statbuf; 40 41 if (stat (name, &statbuf)) 42 { 43 *retdev = NULL; 44 return -1; 45 } 46 if ((fd = open (name, O_RDONLY, 0)) < 0) 47 { 48 *retdev = NULL; 49 return -1; 50 } 51 *retdev = malloc (sizeof (blkdev_t)); 52 (*retdev)->blksize = 512; 53 (*retdev)->devno = fd; 54 return 0; 55 } 56 57 int blk_close (blkdev_t *dev) 58 { 59 close (dev->devno); 60 free (dev); 61 return 0; 62 } 63 64 int blk_read (blkdev_t *dev, void *buf, int block, int count) 65 { 66 int i; 67 68 lseek (dev->devno, block * dev->blksize, SEEK_SET); 69 for (i = 0; i < count; i++) 70 read (dev->devno, buf + dev->blksize * i, dev->blksize); 71 return 0; 72 } 73 74 int blk_write (blkdev_t dev, const void *buf, int block, int count) 75 { 76 return 0; 77 } 78