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File: [cvs.NetBSD.org] / src / share / examples / rump / sdread / sdread.c (download)

Revision 1.6, Thu Mar 25 15:00:20 2010 UTC (10 years, 6 months ago) by pooka
Branch: MAIN
CVS Tags: yamt-pagecache-tag8, yamt-pagecache-base9, yamt-pagecache-base8, yamt-pagecache-base7, yamt-pagecache-base6, yamt-pagecache-base5, yamt-pagecache-base4, yamt-pagecache-base3, yamt-pagecache-base2, yamt-pagecache-base, yamt-pagecache, tls-maxphys-base, tls-maxphys, tls-earlyentropy-base, tls-earlyentropy, riastradh-xf86-video-intel-2-7-1-pre-2-21-15, riastradh-drm2-base3, riastradh-drm2-base2, riastradh-drm2-base1, riastradh-drm2-base, riastradh-drm2, prg-localcount2-base3, prg-localcount2-base2, prg-localcount2-base1, prg-localcount2-base, prg-localcount2, phil-wifi-base, phil-wifi-20200421, phil-wifi-20200411, phil-wifi-20200406, phil-wifi-20191119, phil-wifi-20190609, phil-wifi, pgoyette-localcount-base, pgoyette-localcount-20170426, pgoyette-localcount-20170320, pgoyette-localcount-20170107, pgoyette-localcount-20161104, pgoyette-localcount-20160806, pgoyette-localcount-20160726, pgoyette-localcount, pgoyette-compat-merge-20190127, pgoyette-compat-base, pgoyette-compat-20190127, pgoyette-compat-20190118, pgoyette-compat-1226, pgoyette-compat-1126, pgoyette-compat-1020, pgoyette-compat-0930, pgoyette-compat-0906, pgoyette-compat-0728, pgoyette-compat-0625, pgoyette-compat-0521, pgoyette-compat-0502, pgoyette-compat-0422, pgoyette-compat-0415, pgoyette-compat-0407, pgoyette-compat-0330, pgoyette-compat-0322, pgoyette-compat-0315, pgoyette-compat, perseant-stdc-iso10646-base, perseant-stdc-iso10646, netbsd-9-base, netbsd-9-0-RELEASE, netbsd-9-0-RC2, netbsd-9-0-RC1, netbsd-9, netbsd-8-base, netbsd-8-2-RELEASE, netbsd-8-1-RELEASE, netbsd-8-1-RC1, netbsd-8-0-RELEASE, netbsd-8-0-RC2, netbsd-8-0-RC1, netbsd-8, netbsd-7-nhusb-base-20170116, netbsd-7-nhusb-base, netbsd-7-nhusb, netbsd-7-base, netbsd-7-2-RELEASE, netbsd-7-1-RELEASE, netbsd-7-1-RC2, netbsd-7-1-RC1, netbsd-7-1-2-RELEASE, netbsd-7-1-1-RELEASE, netbsd-7-1, netbsd-7-0-RELEASE, netbsd-7-0-RC3, netbsd-7-0-RC2, netbsd-7-0-RC1, netbsd-7-0-2-RELEASE, netbsd-7-0-1-RELEASE, netbsd-7-0, netbsd-7, netbsd-6-base, netbsd-6-1-RELEASE, netbsd-6-1-RC4, netbsd-6-1-RC3, netbsd-6-1-RC2, netbsd-6-1-RC1, netbsd-6-1-5-RELEASE, netbsd-6-1-4-RELEASE, netbsd-6-1-3-RELEASE, netbsd-6-1-2-RELEASE, netbsd-6-1-1-RELEASE, netbsd-6-1, netbsd-6-0-RELEASE, netbsd-6-0-RC2, netbsd-6-0-RC1, netbsd-6-0-6-RELEASE, netbsd-6-0-5-RELEASE, netbsd-6-0-4-RELEASE, netbsd-6-0-3-RELEASE, netbsd-6-0-2-RELEASE, netbsd-6-0-1-RELEASE, netbsd-6-0, netbsd-6, matt-nb8-mediatek-base, matt-nb8-mediatek, matt-nb6-plus-nbase, matt-nb6-plus-base, matt-nb6-plus, matt-mips64-premerge-20101231, localcount-20160914, is-mlppp-base, is-mlppp, cherry-xenmp-base, cherry-xenmp, bouyer-socketcan-base1, bouyer-socketcan-base, bouyer-socketcan, bouyer-quota2-nbase, bouyer-quota2-base, bouyer-quota2, agc-symver-base, agc-symver, HEAD
Changes since 1.5: +6 -1 lines

Check open return value and close fd when we're done.

/*	$NetBSD: sdread.c,v 1.6 2010/03/25 15:00:20 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 <sys/dkio.h>

#include <ufs/ufs/ufsmount.h>
#include <msdosfs/msdosfsmount.h>
#include <isofs/cd9660/cd9660_mount.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.
 */

/* recent -current, appease 5.0 etc. userland */
#ifndef DIOCTUR
#define DIOCTUR _IOR('d', 128, int)
#endif

static void
waitcd(void)
{
	int fd, val = 0, rounds = 0;

	fd = rump_sys_open("/dev/rcd0d", O_RDWR);
	if (fd == -1)
		return;

	do {
		if (rounds > 0) {
			if (rounds == 1) {
				printf("Waiting for CD device to settle ");
			} else {
				printf(".");
			}
			fflush(stdout);
			sleep(1);
		} 
		if (rump_sys_ioctl(fd, DIOCTUR, &val) == -1)
			err(1, "DIOCTUR");
		rounds++;
	} while (val == 0 || rounds >= 30);

	if (!val)
		printf(" giving up\n");
	else
		printf(" done!\n");

	rump_sys_close(fd);
}

int
main(int argc, char *argv[])
{
	char buf[2048];
	struct msdosfs_args args;
	struct ufs_args uargs;
	struct iso_args iargs;
	struct dirent *dp;
	const char *msg = NULL;
	int fd, n, fd_h, sverrno;
	int probeonly = 0;

	if (argc > 1) {
		if (argc == 2 && strcmp(argv[1], "probe") == 0) {
			probeonly = 1;
		} else if (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;

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

	memset(&iargs, 0, sizeof(iargs));
	iargs.fspec = strdup("/dev/cd0a");

	if (probeonly)
		rump_boot_sethowto(RUMP_AB_VERBOSE);
	rump_init();
	if (probeonly) {
		pause();
		exit(0);
	}

	if (rump_sys_mkdir("/mp", 0777) == -1)
		err(1, "mkdir");
	if (rump_sys_mount(MOUNT_MSDOS, "/mp", MNT_RDONLY,
	    &args, sizeof(args)) == -1) {
		if (rump_sys_mount(MOUNT_FFS, "/mp", MNT_RDONLY,
		    &uargs, sizeof(uargs)) == -1) {
			/*
			 * Wait for CD media to settle.  In the end,
			 * just try to do it anyway and see if we fail.
			 */
			waitcd();
			if (rump_sys_mount(MOUNT_CD9660, "/mp", MNT_RDONLY,
			    &iargs, sizeof(iargs)) == -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;
}