ubase/mountpoint.c

87 lines
1.4 KiB
C

/* See LICENSE file for copyright and license details. */
#include <sys/stat.h>
#include <sys/types.h>
#include <mntent.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "util.h"
static void
usage(void)
{
eprintf("usage: %s [-dqx] target\n", argv0);
}
int
main(int argc, char *argv[])
{
int qflag = 0, dflag = 0, xflag = 0;
struct mntent *me = NULL;
FILE *fp;
int ret = 0;
struct stat st1, st2;
ARGBEGIN {
case 'q':
qflag = 1;
break;
case 'd':
dflag = 1;
break;
case 'x':
xflag = 1;
break;
default:
usage();
} ARGEND;
if (argc < 1)
usage();
if (stat(argv[0], &st1) < 0)
eprintf("stat %s:", argv[0]);
if (xflag) {
if (!S_ISBLK(st1.st_mode))
eprintf("stat: %s: not a block device\n",
argv[0]);
printf("%u:%u\n", major(st1.st_rdev),
minor(st1.st_rdev));
return 0;
}
if (!S_ISDIR(st1.st_mode))
eprintf("stat %s: not a directory\n", argv[0]);
if (dflag) {
printf("%u:%u\n", major(st1.st_dev),
minor(st1.st_dev));
return 0;
}
fp = setmntent("/proc/mounts", "r");
if (!fp)
eprintf("setmntent %s:", "/proc/mounts");
while ((me = getmntent(fp)) != NULL) {
if (stat(me->mnt_dir, &st2) < 0)
eprintf("stat %s:", me->mnt_dir);
if (st1.st_dev == st2.st_dev &&
st1.st_ino == st2.st_ino)
break;
}
endmntent(fp);
if (me == NULL)
ret = 1;
if (!qflag)
printf("%s %s a mountpoint\n", argv[0],
!ret ? "is" : "is not");
return ret;
}