137 lines
2.9 KiB
C
137 lines
2.9 KiB
C
#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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const char df_usage[] = "df [filesystem ...]\n"
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"\n"
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"\tPrint the filesystem space used and space available.\n";
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static int
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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(
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"%-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,
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mountPoint);
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}
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return 0;
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}
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extern int
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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")) == 0 )
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{
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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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}
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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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/*
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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 *
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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
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&& s.st_rdev == mountDevice ) /* Match the device. */
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break;
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if ( stat(mountEntry->mnt_dir, &s) == 0
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&& 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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