source: vendor/3.5.6/client/umount.cifs.c@ 596

/* 
   Unmount utility program for Linux CIFS VFS (virtual filesystem) client
   Copyright (C) 2005 Steve French  (sfrench@us.ibm.com)

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/vfs.h>
#include <fcntl.h>
#include <getopt.h>
#include <errno.h>
#include <string.h>
#include <mntent.h>
#include <limits.h>
#include "mount.h"

#define UNMOUNT_CIFS_VERSION_MAJOR "0"
#define UNMOUNT_CIFS_VERSION_MINOR "6"

#ifndef UNMOUNT_CIFS_VENDOR_SUFFIX
 #ifdef _SAMBA_BUILD_
  #include "version.h"
  #ifdef SAMBA_VERSION_VENDOR_SUFFIX
   #define UNMOUNT_CIFS_VENDOR_SUFFIX "-"SAMBA_VERSION_OFFICIAL_STRING"-"SAMBA_VERSION_VENDOR_SUFFIX
  #else
   #define UNMOUNT_CIFS_VENDOR_SUFFIX "-"SAMBA_VERSION_OFFICIAL_STRING
  #endif /* SAMBA_VERSION_OFFICIAL_STRING and SAMBA_VERSION_VENDOR_SUFFIX */
 #else
  #define UNMOUNT_CIFS_VENDOR_SUFFIX ""
 #endif /* _SAMBA_BUILD_ */
#endif /* UNMOUNT_CIFS_VENDOR_SUFFIX */

#ifndef MNT_DETACH
#define MNT_DETACH 0x02
#endif

#ifndef MNT_EXPIRE
#define MNT_EXPIRE 0x04
#endif

#ifndef MOUNTED_LOCK
#define MOUNTED_LOCK    "/etc/mtab~"
#endif
#ifndef MOUNTED_TEMP
#define MOUNTED_TEMP    "/etc/mtab.tmp"
#endif

#define CIFS_IOC_CHECKUMOUNT _IO(0xCF, 2)
#define CIFS_MAGIC_NUMBER 0xFF534D42   /* the first four bytes of SMB PDU */
   
static struct option longopts[] = {
        { "all", 0, NULL, 'a' },
        { "help",0, NULL, 'h' },
        { "read-only", 0, NULL, 'r' },
        { "ro", 0, NULL, 'r' },
        { "verbose", 0, NULL, 'v' },
        { "version", 0, NULL, 'V' },
        { "expire", 0, NULL, 'e' },
        { "force", 0, 0, 'f' },
        { "lazy", 0, 0, 'l' },
        { "no-mtab", 0, 0, 'n' },
        { NULL, 0, NULL, 0 }
};

const char * thisprogram;
int verboseflg = 0;

static void umount_cifs_usage(void)
{
        printf("\nUsage:  %s <remotetarget> <dir>\n", thisprogram);
        printf("\nUnmount the specified directory\n");
        printf("\nLess commonly used options:");
        printf("\n\t-r\tIf mount fails, retry with readonly remount.");
        printf("\n\t-n\tDo not write to mtab.");
        printf("\n\t-f\tAttempt a forced unmount, even if the fs is busy.");
        printf("\n\t-l\tAttempt lazy unmount, Unmount now, cleanup later.");
        printf("\n\t-v\tEnable verbose mode (may be useful for debugging).");
        printf("\n\t-h\tDisplay this help.");
        printf("\n\nOptions are described in more detail in the manual page");
        printf("\n\tman 8 umount.cifs\n");
        printf("\nTo display the version number of the cifs umount utility:");
        printf("\n\t%s -V\n",thisprogram);
        printf("\nInvoking the umount utility on cifs mounts, can execute");
        printf(" /sbin/umount.cifs (if present and umount -i is not specified.\n");
}

static int umount_check_perm(char * dir)