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148 lines
3.8 KiB
C
148 lines
3.8 KiB
C
/*
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* Mini df implementation for busybox
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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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* based on original code by (I think) Bruce Perens <bruce@pixar.com>.
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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 <mntent.h>
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#include <sys/stat.h>
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#include <sys/vfs.h>
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#include <fstab.h>
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static const char df_usage[] = "df [filesystem ...]\n"
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"\n" "\tPrint the filesystem space used and space available.\n";
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static int df(char *device, const char *mountPoint)
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{
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struct statfs s;
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long blocks_used;
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long blocks_percent_used;
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if (statfs(mountPoint, &s) != 0) {
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perror(mountPoint);
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return 1;
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}
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if (s.f_blocks > 0) {
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blocks_used = s.f_blocks - s.f_bfree;
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blocks_percent_used = (long)
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(blocks_used * 100.0 / (blocks_used + s.f_bavail) + 0.5);
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if (strcmp(device, "/dev/root") == 0)
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device = (getfsfile("/"))->fs_spec;
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printf("%-20s %9ld %9ld %9ld %3ld%% %s\n",
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device,
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(long) (s.f_blocks * (s.f_bsize / 1024.0)),
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(long) ((s.f_blocks - s.f_bfree) * (s.f_bsize / 1024.0)),
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(long) (s.f_bavail * (s.f_bsize / 1024.0)),
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blocks_percent_used, mountPoint);
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}
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return 0;
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}
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/*
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* Given a block device, find the mount table entry if that block device
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* is mounted.
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*
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* Given any other file (or directory), find the mount table entry for its
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* filesystem.
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*/
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extern struct mntent *findMountPoint(const char *name, const char *table)
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{
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struct stat s;
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dev_t mountDevice;
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FILE *mountTable;
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struct mntent *mountEntry;
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if (stat(name, &s) != 0)
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return 0;
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if ((s.st_mode & S_IFMT) == S_IFBLK)
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mountDevice = s.st_rdev;
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else
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mountDevice = s.st_dev;
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if ((mountTable = setmntent(table, "r")) == 0)
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return 0;
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while ((mountEntry = getmntent(mountTable)) != 0) {
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if (strcmp(name, mountEntry->mnt_dir) == 0
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|| strcmp(name, mountEntry->mnt_fsname) == 0) /* String match. */
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break;
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if (stat(mountEntry->mnt_fsname, &s) == 0 && s.st_rdev == mountDevice) /* Match the device. */
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break;
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if (stat(mountEntry->mnt_dir, &s) == 0 && s.st_dev == mountDevice) /* Match the directory's mount point. */
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break;
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}
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endmntent(mountTable);
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return mountEntry;
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}
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extern int df_main(int argc, char **argv)
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{
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printf("%-20s %-14s %s %s %s %s\n", "Filesystem",
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"1k-blocks", "Used", "Available", "Use%", "Mounted on");
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if (argc > 1) {
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struct mntent *mountEntry;
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int status;
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while (argc > 1) {
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if ((mountEntry = findMountPoint(argv[1], "/proc/mounts")) ==
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0) {
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fprintf(stderr, "%s: can't find mount point.\n", argv[1]);
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return 1;
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}
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status = df(mountEntry->mnt_fsname, mountEntry->mnt_dir);
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if (status != 0)
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return status;
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argc--;
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argv++;
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}
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return 0;
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} else {
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FILE *mountTable;
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struct mntent *mountEntry;
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mountTable = setmntent("/proc/mounts", "r");
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if (mountTable == 0) {
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perror("/proc/mounts");
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exit(FALSE);
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}
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while ((mountEntry = getmntent(mountTable))) {
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int status = df(mountEntry->mnt_fsname, mountEntry->mnt_dir);
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if (status)
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return status;
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}
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endmntent(mountTable);
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}
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return 0;
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}
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