[src/trunk]: src/share/examples/rump/sdread Add an example program which show...

[pooka <pooka%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/9319beb21425
branches:  trunk
changeset: 747910:9319beb21425
user:      pooka <pooka%NetBSD.org@localhost>
date:      Mon Oct 05 13:05:31 2009 +0000

description:
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.

diffstat:

 share/examples/rump/sdread/Makefile |   14 +++
 share/examples/rump/sdread/sdread.c |  138 ++++++++++++++++++++++++++++++++++++
 2 files changed, 152 insertions(+), 0 deletions(-)

diffs (160 lines):

diff -r 23be1a1c8a2c -r 9319beb21425 share/examples/rump/sdread/Makefile
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/share/examples/rump/sdread/Makefile       Mon Oct 05 13:05:31 2009 +0000
@@ -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>
diff -r 23be1a1c8a2c -r 9319beb21425 share/examples/rump/sdread/sdread.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/share/examples/rump/sdread/sdread.c       Mon Oct 05 13:05:31 2009 +0000
@@ -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;
+}