2.11BSD/src/bin/df.c
/*
* Copyright (c) 1980, 1990, 1993, 1994
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS 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.
*/
#if !defined(lint) && defined(DOSCCS)
static char copyright[] =
"@(#) Copyright (c) 1980, 1990, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
static char sccsid[] = "@(#)df.c 8.7.2 (2.11BSD) 1996/1/18";
#endif
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/file.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int bread();
char *getmntpt();
void prtstat();
void ufs_df();
void usage();
int iflag;
int
main(argc, argv)
int argc;
register char *argv[];
{
struct stat stbuf;
struct statfs statfsbuf, *mntbuf;
int mntsize;
int ch, err, i, maxwidth, width;
char *mntpt;
while ((ch = getopt(argc, argv, "i")) != EOF)
switch (ch) {
case 'i':
iflag = 1;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
maxwidth = 0;
for (i = 0; i < mntsize; i++) {
width = strlen(mntbuf[i].f_mntfromname);
if (width > maxwidth)
maxwidth = width;
}
if (!*argv) {
for (i = 0; i < mntsize; i++)
prtstat(&mntbuf[i], maxwidth);
exit(0);
}
for (; *argv; argv++) {
if (stat(*argv, &stbuf) < 0) {
err = errno;
if ((mntpt = getmntpt(*argv)) == 0) {
warn("%s", *argv);
continue;
}
} else if ((stbuf.st_mode & S_IFMT) == S_IFCHR) {
ufs_df(*argv, maxwidth);
continue;
} else if ((stbuf.st_mode & S_IFMT) == S_IFBLK) {
if ((mntpt = getmntpt(*argv)) == 0) {
ufs_df(*argv, maxwidth);
continue;
}
} else
mntpt = *argv;
/*
* Statfs does not take a `wait' flag, so we cannot
* implement nflag here.
*/
if (statfs(mntpt, &statfsbuf) < 0) {
warn("%s", mntpt);
continue;
}
if (argc == 1)
maxwidth = strlen(statfsbuf.f_mntfromname) + 1;
prtstat(&statfsbuf, maxwidth);
}
return (0);
}
char *
getmntpt(name)
char *name;
{
register int i;
int mntsize;
struct statfs *mntbuf;
mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
for (i = 0; i < mntsize; i++) {
if (!strcmp(mntbuf[i].f_mntfromname, name))
return (mntbuf[i].f_mntonname);
}
return (0);
}
/*
* Convert statfs returned filesystem size into BLOCKSIZE units.
* Attempts to avoid overflow for large filesystems.
*/
long
fsbtoblk(num, fsbs, bs)
long num;
register int fsbs, bs;
{
return((fsbs != 0 && fsbs < bs) ?
num / (bs / fsbs) : (num) * (fsbs / bs));
}
/*
* Print out status about a filesystem.
*/
void
prtstat(sfsp, maxwidth)
register struct statfs *sfsp;
register int maxwidth;
{
static int blocksize;
static int headerlen, timesthrough;
static char *header;
long used, availblks;
ino_t inodes, iused;
if (maxwidth < 11)
maxwidth = 11;
if (++timesthrough == 1) {
/* header = getbsize(&headerlen, &blocksize); */
header = "1K-blocks";
blocksize = 1024;
headerlen = 9;
(void)printf("%-*.*s %s Used Avail Capacity",
maxwidth, maxwidth, "Filesystem", header);
if (iflag)
(void)printf(" iused ifree %%iused");
(void)printf(" Mounted on\n");
}
(void)printf("%-*.*s", maxwidth, maxwidth, sfsp->f_mntfromname);
used = sfsp->f_blocks - sfsp->f_bfree;
availblks = sfsp->f_bavail + used;
(void)printf(" %*ld %8ld %8ld", headerlen,
fsbtoblk(sfsp->f_blocks, sfsp->f_bsize, blocksize),
fsbtoblk(used, sfsp->f_bsize, blocksize),
fsbtoblk(sfsp->f_bavail, sfsp->f_bsize, blocksize));
(void)printf(" %5.0f%%",
availblks == 0 ? 100.0 : (double)used / (double)availblks * 100.0);
if (iflag) {
inodes = sfsp->f_files;
iused = inodes - sfsp->f_ffree;
(void)printf(" %7u %7u %5.0f%% ", iused, sfsp->f_ffree,
inodes == 0 ? 100.0 : (double)iused / (double)inodes * 100.0);
} else
(void)printf(" ");
(void)printf(" %s\n", sfsp->f_mntonname);
}
/*
* This code constitutes the pre-system call Berkeley df code for extracting
* information from filesystem superblocks.
*/
#include <sys/fs.h>
#include <fstab.h>
union {
struct fs fs;
char dummy[SBSIZE];
} sb;
#define sblock sb.fs
int rfd;
void
ufs_df(file, maxwidth)
char *file;
int maxwidth;
{
struct statfs statfsbuf;
register struct statfs *sfsp;
register char *mntpt;
static int synced;
if (synced++ == 0)
sync();
if ((rfd = open(file, O_RDONLY)) < 0) {
warn("%s", file);
return;
}
if (bread((off_t)SBLOCK * DEV_BSIZE, &sblock, SBSIZE) == 0) {
(void)close(rfd);
return;
}
sfsp = &statfsbuf;
sfsp->f_type = MOUNT_UFS;
sfsp->f_flags = 0;
sfsp->f_bsize = MAXBSIZE;
sfsp->f_iosize = MAXBSIZE;
sfsp->f_blocks = sblock.fs_fsize - sblock.fs_isize;
sfsp->f_bfree = sblock.fs_tfree;
sfsp->f_bavail = sblock.fs_tfree;
if (sfsp->f_bavail < 0)
sfsp->f_bavail = 0;
sfsp->f_files = (sblock.fs_isize - 2) * INOPB;
sfsp->f_ffree = sblock.fs_tinode;
sfsp->f_fsid[0] = 0;
sfsp->f_fsid[1] = 0;
if ((mntpt = getmntpt(file)) == 0)
mntpt = "";
bcopy(mntpt, &sfsp->f_mntonname[0], MNAMELEN);
bcopy(file, &sfsp->f_mntfromname[0], MNAMELEN);
prtstat(sfsp, maxwidth);
(void)close(rfd);
}
int
bread(off, buf, cnt)
off_t off;
void *buf;
register int cnt;
{
register int nr;
(void)lseek(rfd, off, L_SET);
if ((nr = read(rfd, buf, cnt)) != cnt) {
/* Probably a dismounted disk if errno == EIO. */
if (errno != EIO)
(void)fprintf(stderr, "\ndf: %ld: %s\n",
off, strerror(nr > 0 ? EIO : errno));
return (0);
}
return (1);
}
void
usage()
{
(void)fprintf(stderr, "usage: df [-i] [file | file_system ...]\n");
exit(1);
}