ubase/mountpoint.c

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