xref: /src/share/examples/rump/sdread/sdread.c

/*	$NetBSD: sdread.c,v 1.1 2009/10/05 13:05:31 pooka Exp $	*/

/*
 * Copyright (c) 2009 Antti Kantee.  All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/types.h>
#include <sys/dirent.h>
#include <sys/mount.h>

#include <msdosfs/msdosfsmount.h>

#include <rump/rump.h>
#include <rump/rump_syscalls.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

/*
 * Proof-of-concept program:
 *
 * Mount rump file system from device driver stack included in the
 * rump kernel.  Optionally copy a file out of the mounted file system.
 */

int
main(int argc, char *argv[])
{
	char buf[2048];
	struct msdosfs_args args;
	struct dirent *dp;
	const char *msg = NULL;
	int fd, n, fd_h, sverrno;

	if (argc > 1 && argc != 3) {
		fprintf(stderr, "usage: a.out [src hostdest]\n");
		exit(1);
	}

	memset(&args, 0, sizeof(args));
	args.fspec = strdup("/dev/sd0e");
	args.version = MSDOSFSMNT_VERSION;

	rump_init();

	if (rump_sys_mkdir("/mp", 0777) == -1)
		err(1, "mkdir");
	if (rump_sys_mount(MOUNT_MSDOS, "/mp", MNT_RDONLY,
	    &args, sizeof(args)) == -1)
		err(1, "mount");

	fd = rump_sys_open("/mp", O_RDONLY, 0);
	if (fd == -1) {
		msg = "open dir";
		goto out;
	}

	while ((n = rump_sys_getdents(fd, buf, sizeof(buf))) > 0) {
		for (dp = (struct dirent *)buf;
		    (char *)dp - buf < n;
		    dp = _DIRENT_NEXT(dp)) {
			printf("%" PRIu64 ": %s\n", dp->d_fileno, dp->d_name);
		}
	}
	rump_sys_close(fd);
	if (argc == 1)
		goto out;

	rump_sys_chdir("/mp");
	fd = rump_sys_open(argv[1], O_RDONLY, 0);
	if (fd == -1) {
		msg = "open fs file";
		goto out;
	}

	fd_h = open(argv[2], O_RDWR | O_CREAT, 0777);
	if (fd_h == -1) {
		msg = "open host file";
		goto out;
	}

	while ((n = rump_sys_read(fd, buf, sizeof(buf))) == sizeof(buf)) {
		if (write(fd_h, buf, sizeof(buf)) != sizeof(buf)) {
			msg = "write host file";
			goto out;
		}
	}
	if (n == -1) {
		msg = "read fs file";
		goto out;
	}

	if (n > 0) {
		if (write(fd_h, buf, n) == -1)
			msg = "write tail";
	}

 out:
	sverrno = errno;
	rump_sys_chdir("/");
	rump_sys_close(fd);
	close(fd_h);
	if (rump_sys_unmount("/mp", 0) == -1)
		err(1, "unmount");

	if (msg) {
		errno = sverrno;
		err(1, "%s", msg);
	}

	return 0;
}