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#define _GNU_SOURCE
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include <errno.h>
#include <mntent.h>
#include <string.h>
#include <fcntl.h>
//#define MOUNT_FILE "/etc/mtab"
#define MOUNT_FILE "/proc/mounts"
static int mountpoint(char *filename, char **fstype)
{
struct stat s;
struct mntent mnt;
FILE *fp;
dev_t dev;
char buf[1024];
int fd;
fd = open(filename, O_RDONLY);
if (0 > fd) {
fprintf(stderr, "CANNOT OPEN %s\n", filename);
return EINVAL;
}
if (fstat(fd, &s) != 0) {
return EINVAL;
}
close(fd);
dev = s.st_dev;
if ((fp = setmntent(MOUNT_FILE, "r")) == NULL) {
return EINVAL;
}
while (getmntent_r(fp, &mnt, buf, sizeof(buf))) {
fd = open(mnt.mnt_dir, O_RDONLY);
if (0 > fd) {
// probably lack permissions
continue;
}
if (fstat(fd, &s) != 0) {
close(fd);
continue;
}
if (s.st_dev == dev) {
*fstype = strdup(mnt.mnt_type);
close(fd);
return 0;
}
close(fd);
}
endmntent(fp);
// Should never reach here.
return EINVAL;
}
int main(int argc, char **argv)
{
int n, rc;
char *fstype;
if (argc < 2) {
fprintf(stderr, "Usage: %s file1 file2 ...\n", argv[0]);
return 1;
}
for (n=1; NULL != argv[n]; n++) {
rc = mountpoint(argv[n], &fstype);
if (0 == rc) {
fprintf(stdout, "Return: %d File: %s FStype: %s\n", rc, argv[n], fstype);
free(fstype);
} else {
fprintf(stdout, "File: %s Unknown type\n", argv[n]);
}
}
return 0;
}
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