Add an example program which shows how to mount and read files from

an msdos file system which is located on a usb stick.  What makes
this special is that the USB driver stack (and the file system
driver, of course) is run in rump instead of in the host kernel.

share/examples/rump/sdread/Makefile

@@ -0,0 +1,14 @@
+#	$NetBSD: Makefile,v 1.1 2009/10/05 13:05:31 pooka Exp $
+#
+
+PROG=	sdread
+
+LDADD+=	-lrumpfs_msdos -lrumpvfs
+LDADD+=	-lrumpdev_disk -lrumpdev_usb -lrumpdev_usbhc -lrumpdev_umass -lrumpdev
+LDADD+=	-lrump
+LDADD+=	-lrumpuser -lpthread
+
+DBG=	-g
+NOMAN=	
+
+.include <bsd.prog.mk>

share/examples/rump/sdread/sdread.c

@@ -0,0 +1,138 @@
+/*	$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;
+}