share/examples/rump/sdread/sdread.c

   1 /*      $NetBSD: sdread.c,v 1.1 2009/10/05 13:05:31 pooka Exp $ */
   2
   3 /*
   4  * Copyright (c) 2009 Antti Kantee.  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  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  16  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  18  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27
  28 #include <sys/types.h>
  29 #include <sys/dirent.h>
  30 #include <sys/mount.h>
  31
  32 #include <ufs/ufs/ufsmount.h>
  33 #include <msdosfs/msdosfsmount.h>
  34
  35 #include <rump/rump.h>
  36 #include <rump/rump_syscalls.h>
  37
  38 #include <err.h>
  39 #include <errno.h>
  40 #include <fcntl.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45
  46 /*
  47  * Proof-of-concept program:
  48  *
  49  * Mount rump file system from device driver stack included in the
  50  * rump kernel.  Optionally copy a file out of the mounted file system.
  51  */
  52
  53 int
  54 main(int argc, char *argv[])
  55 {
  56         char buf[2048];
  57         struct msdosfs_args args;
  58         struct ufs_args uargs;
  59         struct dirent *dp;
  60         const char *msg = NULL;
  61         int fd, n, fd_h, sverrno;
  62
  63         if (argc > 1 && argc != 3) {
  64                 fprintf(stderr, "usage: a.out [src hostdest]\n");
  65                 exit(1);
  66         }
  67
  68         memset(&args, 0, sizeof(args));
  69         args.fspec = strdup("/dev/sd0e");
  70         args.version = MSDOSFSMNT_VERSION;
  71
  72         memset(&uargs, 0, sizeof(uargs));
  73         uargs.fspec = strdup("/dev/sd0e");
  74
  75         rump_init();
  76
  77         if (rump_sys_mkdir("/mp", 0777) == -1)
  78                 err(1, "mkdir");
  79         if (rump_sys_mount(MOUNT_MSDOS, "/mp", MNT_RDONLY,
  80             &args, sizeof(args)) == -1) {
  81                 if (rump_sys_mount(MOUNT_FFS, "/mp", MNT_RDONLY,
  82                     &uargs, sizeof(uargs)) == -1) {
  83                         err(1, "mount");
  84                 }
  85         }
  86
  87         fd = rump_sys_open("/mp", O_RDONLY, 0);
  88         if (fd == -1) {
  89                 msg = "open dir";
  90                 goto out;
  91         }
  92
  93         while ((n = rump_sys_getdents(fd, buf, sizeof(buf))) > 0) {
  94                 for (dp = (struct dirent *)buf;
  95                     (char *)dp - buf < n;
  96                     dp = _DIRENT_NEXT(dp)) {
  97                         printf("%" PRIu64 ": %s\n", dp->d_fileno, dp->d_name);
  98                 }
  99         }
 100         rump_sys_close(fd);
 101         if (argc == 1)
 102                 goto out;
 103
 104         rump_sys_chdir("/mp");
 105         fd = rump_sys_open(argv[1], O_RDONLY, 0);
 106         if (fd == -1) {
 107                 msg = "open fs file";
 108                 goto out;
 109         }
 110
 111         fd_h = open(argv[2], O_RDWR | O_CREAT, 0777);
 112         if (fd_h == -1) {
 113                 msg = "open host file";
 114                 goto out;
 115         }
 116
 117         while ((n = rump_sys_read(fd, buf, sizeof(buf))) == sizeof(buf)) {
 118                 if (write(fd_h, buf, sizeof(buf)) != sizeof(buf)) {
 119                         msg = "write host file";
 120                         goto out;
 121                 }
 122         }
 123         if (n == -1) {
 124                 msg = "read fs file";
 125                 goto out;
 126         }
 127
 128         if (n > 0) {
 129                 if (write(fd_h, buf, n) == -1)
 130                         msg = "write tail";
 131         }
 132
 133  out:
 134         sverrno = errno;
 135         rump_sys_chdir("/");
 136         rump_sys_close(fd);
 137         close(fd_h);
 138         if (rump_sys_unmount("/mp", 0) == -1)
 139                 err(1, "unmount");
 140
 141         if (msg) {
 142                 errno = sverrno;
 143                 err(1, "%s", msg);
 144         }
 145
 146         return 0;
 147 }