129 lines
2.8 KiB
C
129 lines
2.8 KiB
C
/*
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* mountpoint See if a directory is a mountpoint.
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*
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* Author: Miquel van Smoorenburg.
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*
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* Version: @(#)mountpoint 2.85-12 17-Mar-2004 miquels@cistron.nl
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*
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* This file is part of the sysvinit suite,
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* Copyright (C) 1991-2004 Miquel van Smoorenburg.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <sys/stat.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <getopt.h>
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#include <stdio.h>
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int dostat(char *path, struct stat *st, int do_lstat, int quiet)
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{
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int n;
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if (do_lstat)
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n = lstat(path, st);
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else
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n = stat(path, st);
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if (n != 0) {
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if (!quiet)
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fprintf(stderr, "mountpoint: %s: %s\n", path,
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strerror(errno));
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return -1;
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}
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return 0;
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}
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void usage(void) {
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fprintf(stderr, "Usage: mountpoint [-q] [-d] [-x] path\n");
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exit(1);
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}
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int main(int argc, char **argv)
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{
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struct stat st, st2;
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char buf[256];
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char *path;
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int quiet = 0;
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int showdev = 0;
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int xdev = 0;
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int c, r;
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while ((c = getopt(argc, argv, "dqx")) != EOF) switch(c) {
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case 'd':
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showdev = 1;
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break;
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case 'q':
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quiet = 1;
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break;
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case 'x':
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xdev = 1;
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break;
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default:
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usage();
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break;
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}
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if (optind != argc - 1) usage();
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path = argv[optind];
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if (dostat(path, &st, !xdev, quiet) < 0)
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return 1;
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if (xdev) {
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#ifdef __linux__
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if (!S_ISBLK(st.st_mode))
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#else
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if (!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode))
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#endif
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{
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if (quiet)
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printf("\n");
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else
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fprintf(stderr, "mountpoint: %s: not a block device\n",
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path);
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return 1;
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}
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printf("%u:%u\n", major(st.st_rdev), minor(st.st_rdev));
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return 0;
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}
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if (!S_ISDIR(st.st_mode)) {
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if (!quiet)
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fprintf(stderr, "mountpoint: %s: not a directory\n",
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path);
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return 1;
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}
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memset(buf, 0, sizeof(buf));
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strncpy(buf, path, sizeof(buf) - 4);
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strcat(buf, "/..");
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if (dostat(buf, &st2, 0, quiet) < 0)
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return 1;
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r = (st.st_dev != st2.st_dev) ||
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(st.st_dev == st2.st_dev && st.st_ino == st2.st_ino);
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if (!quiet && !showdev)
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printf("%s is %sa mountpoint\n", path, r ? "" : "not ");
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if (showdev)
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printf("%u:%u\n", major(st.st_dev), minor(st.st_dev));
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return r ? 0 : 1;
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}
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