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/* mntinfo.c
Author: William Woodruff
Gets information about the given filesystem from /etc/mtab and statvfs.
The output is intended to be easily parseable with grep + awk.
This code is licensed by William Woodruff under the MIT License.
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <mntent.h>
#include <sys/statvfs.h>
int mntinfo(char *fs_name);
void print_mntinfo(struct mntent *ent, struct statvfs stats);
int main(int argc, char **argv)
if (argc != 2) {
printf("Usage: %s <fs name>\n", argv[0]);
return 1;
return mntinfo(argv[1]);
int mntinfo(char *fs_name)
FILE *mtab;
struct mntent *ent;
struct statvfs stats;
bool found = false;
mtab = setmntent("/etc/mtab", "r");
if (!mtab) {
fprintf(stderr, "Fatal: Could not read /etc/mtab.\n");
return 1;
while (!found && (ent = getmntent(mtab))) {
if (!strcmp(fs_name, ent->mnt_fsname)) {
found = true;
if (!found) {
fprintf(stderr, "Fatal: No entry for %s in /etc/mtab.\n", fs_name);
return 1;
if (statvfs(ent->mnt_dir, &stats) < 0) {
fprintf(stderr, "Fatal: Could not stat %s (%s).\n", ent->mnt_dir,
return 1;
print_mntinfo(ent, stats);
return 0;
void print_mntinfo(struct mntent *ent, struct statvfs stats)
/* fields from mntent struct */
printf("mnt_fsname: %s\n", ent->mnt_fsname);
printf("mnt_dir: %s\n", ent->mnt_dir);
printf("mnt_type: %s\n", ent->mnt_type);
printf("mnt_opts: %s\n", ent->mnt_opts);
printf("mnt_freq: %d\n", ent->mnt_freq);
printf("mnt_passno: %d\n", ent->mnt_passno);
/* fields from statvfs struct */
printf("f_bsize: %lu\n", stats.f_bsize);
printf("f_frsize: %lu\n", stats.f_frsize);
printf("f_blocks: %lu\n", stats.f_blocks);
printf("f_bfree: %lu\n", stats.f_bfree);
printf("f_bavail: %lu\n", stats.f_bavail);
printf("f_files: %lu\n", stats.f_files);
printf("f_ffree: %lu\n", stats.f_ffree);
printf("f_favail: %lu\n", stats.f_favail);
printf("f_fsid: %lu\n", stats.f_fsid);
printf("f_flag: %lu\n", stats.f_flag);
printf("f_namemax: %lu\n", stats.f_namemax);