mirror of
https://github.com/topjohnwu/ndk-busybox.git
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138 lines
3.1 KiB
C
138 lines
3.1 KiB
C
/*
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* Mini umount implementation for busybox
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*
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*
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* Copyright (C) 1999 by Lineo, inc.
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* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include "internal.h"
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#include <stdio.h>
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#include <sys/mount.h>
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#include <mntent.h>
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#include <fstab.h>
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#include <errno.h>
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static const char umount_usage[] =
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"Usage: umount [flags] filesystem|directory\n"
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"Optional Flags:\n"
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"\t-a:\tUnmount all file systems"
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#ifdef BB_MTAB
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" in /etc/mtab\n\t-n:\tDon't erase /etc/mtab entries\n"
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#else
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"\n"
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#endif
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;
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static int useMtab = TRUE;
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static int umountAll = FALSE;
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extern const char mtab_file[]; /* Defined in utility.c */
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#if ! defined BB_MTAB
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#define do_umount( blockDevice, useMtab) umount( blockDevice)
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#else
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static int
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do_umount(const char* name, int useMtab)
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{
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int status = umount(name);
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if ( status == 0 ) {
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if ( useMtab==TRUE )
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erase_mtab(name);
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return 0;
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}
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else
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return( status);
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}
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#endif
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static int
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umount_all(int useMtab)
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{
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int status;
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struct mntent *m;
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FILE *mountTable;
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if ((mountTable = setmntent (mtab_file, "r"))) {
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while ((m = getmntent (mountTable)) != 0) {
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char *blockDevice = m->mnt_fsname;
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#if ! defined BB_MTAB
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if (strcmp (blockDevice, "/dev/root") == 0)
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blockDevice = (getfsfile ("/"))->fs_spec;
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#endif
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/* Don't umount /proc when doing umount -a */
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if (strcmp (blockDevice, "proc") == 0)
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continue;
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status=do_umount (m->mnt_dir, useMtab);
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if (status!=0) {
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/* Don't bother retrying the umount on busy devices */
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if (errno==EBUSY) {
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perror(m->mnt_dir);
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continue;
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}
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status=do_umount (blockDevice, useMtab);
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if (status!=0) {
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printf ("Couldn't umount %s on %s (type %s): %s\n",
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blockDevice, m->mnt_dir, m->mnt_type, strerror(errno));
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}
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}
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}
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endmntent (mountTable);
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}
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return( TRUE);
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}
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extern int
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umount_main(int argc, char** argv)
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{
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if (argc < 2) {
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usage( umount_usage);
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}
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/* Parse any options */
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while (argc-- > 0 && **(argv++) == '-') {
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while (*++(*argv)) switch (**argv) {
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case 'a':
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umountAll = TRUE;
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break;
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#ifdef BB_MTAB
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case 'n':
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useMtab = FALSE;
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break;
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#endif
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default:
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usage( umount_usage);
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}
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}
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if(umountAll) {
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exit(umount_all(useMtab));
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}
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if ( do_umount(*argv,useMtab) == 0 )
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exit (TRUE);
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else {
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perror("umount");
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exit( FALSE);
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}
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}
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