mirror of
https://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git
synced 2024-12-12 11:23:32 +08:00
1d6fd6d0c3
Clean up unused variables found by GCC on MacOS. Signed-off-by: Andreas Dilger <adilger@dilger.ca> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
219 lines
4.5 KiB
C
219 lines
4.5 KiB
C
/*
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* ismounted.c --- Check to see if the filesystem was mounted
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*
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* Copyright (C) 1995,1996,1997,1998,1999,2000,2008 Theodore Ts'o.
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU Public
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* License.
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* %End-Header%
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*/
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#include "config.h"
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#include <stdio.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#if HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#include <fcntl.h>
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#ifdef HAVE_LINUX_FD_H
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#include <linux/fd.h>
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#endif
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#ifdef HAVE_MNTENT_H
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#include <mntent.h>
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#endif
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#include <string.h>
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#include <sys/stat.h>
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#include <ctype.h>
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#include "fsck.h"
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/*
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* ext2fs_check_if_mounted flags
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*/
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#define MF_MOUNTED 1
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#include "et/com_err.h"
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#ifdef HAVE_SETMNTENT
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static char *skip_over_blank(char *cp)
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{
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while (*cp && isspace(*cp))
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cp++;
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return cp;
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}
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static char *skip_over_word(char *cp)
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{
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while (*cp && !isspace(*cp))
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cp++;
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return cp;
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}
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static char *parse_word(char **buf)
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{
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char *word, *next;
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word = *buf;
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if (*word == 0)
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return 0;
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word = skip_over_blank(word);
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next = skip_over_word(word);
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if (*next)
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*next++ = 0;
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*buf = next;
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return word;
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}
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#endif
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/*
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* Helper function which checks a file in /etc/mtab format to see if a
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* filesystem is mounted. Returns an error if the file doesn't exist
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* or can't be opened.
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*/
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static errcode_t check_mntent_file(const char *mtab_file, const char *file,
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int *mount_flags)
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{
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#ifdef HAVE_SETMNTENT
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struct stat st_buf;
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errcode_t retval = 0;
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dev_t file_dev=0, file_rdev=0;
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ino_t file_ino=0;
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FILE *f;
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char buf[1024], *device = 0, *mnt_dir = 0, *cp;
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*mount_flags = 0;
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if ((f = setmntent (mtab_file, "r")) == NULL)
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return errno;
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if (stat(file, &st_buf) == 0) {
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if (S_ISBLK(st_buf.st_mode)) {
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#ifndef __GNU__ /* The GNU hurd is broken with respect to stat devices */
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file_rdev = st_buf.st_rdev;
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#endif /* __GNU__ */
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} else {
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file_dev = st_buf.st_dev;
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file_ino = st_buf.st_ino;
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}
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}
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while (1) {
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if (!fgets(buf, sizeof(buf), f)) {
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device = mnt_dir = 0;
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break;
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}
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buf[sizeof(buf)-1] = 0;
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cp = buf;
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device = parse_word(&cp);
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if (!device || *device == '#')
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return 0; /* Ignore blank lines and comments */
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mnt_dir = parse_word(&cp);
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if (device[0] != '/')
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continue;
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if (strcmp(file, device) == 0)
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break;
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if (stat(device, &st_buf) == 0) {
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if (S_ISBLK(st_buf.st_mode)) {
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#ifndef __GNU__
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if (file_rdev && (file_rdev == st_buf.st_rdev))
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break;
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#endif /* __GNU__ */
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} else {
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if (file_dev && ((file_dev == st_buf.st_dev) &&
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(file_ino == st_buf.st_ino)))
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break;
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}
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}
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}
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if (mnt_dir == 0) {
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#ifndef __GNU__ /* The GNU hurd is broken with respect to stat devices */
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/*
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* Do an extra check to see if this is the root device. We
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* can't trust /etc/mtab, and /proc/mounts will only list
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* /dev/root for the root filesystem. Argh. Instead we
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* check if the given device has the same major/minor number
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* as the device that the root directory is on.
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*/
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if (file_rdev && (stat("/", &st_buf) == 0) &&
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(st_buf.st_dev == file_rdev))
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*mount_flags = MF_MOUNTED;
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#endif /* __GNU__ */
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goto errout;
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}
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#ifndef __GNU__ /* The GNU hurd is deficient; what else is new? */
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/* Validate the entry in case /etc/mtab is out of date */
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/*
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* We need to be paranoid, because some broken distributions
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* (read: Slackware) don't initialize /etc/mtab before checking
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* all of the non-root filesystems on the disk.
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*/
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if (stat(mnt_dir, &st_buf) < 0) {
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retval = errno;
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if (retval == ENOENT) {
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#ifdef DEBUG
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printf("Bogus entry in %s! (%s does not exist)\n",
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mtab_file, mnt_dir);
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#endif /* DEBUG */
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retval = 0;
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}
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goto errout;
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}
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if (file_rdev && (st_buf.st_dev != file_rdev)) {
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#ifdef DEBUG
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printf("Bogus entry in %s! (%s not mounted on %s)\n",
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mtab_file, file, mnt_dir);
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#endif /* DEBUG */
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goto errout;
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}
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#endif /* __GNU__ */
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*mount_flags = MF_MOUNTED;
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retval = 0;
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errout:
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endmntent (f);
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return retval;
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#else /* !HAVE_SETMNTENT */
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return 0;
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#endif /* HAVE_MNTENT_H */
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}
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int is_mounted(const char *file)
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{
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errcode_t retval;
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int mount_flags = 0;
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#ifdef __linux__
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retval = check_mntent_file("/proc/mounts", file, &mount_flags);
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if (retval)
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return 0;
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if (mount_flags)
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return 1;
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#endif /* __linux__ */
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retval = check_mntent_file("/etc/mtab", file, &mount_flags);
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if (retval)
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return 0;
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return (mount_flags);
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}
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#ifdef DEBUG
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int main(int argc, char **argv)
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{
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if (argc < 2) {
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fprintf(stderr, "Usage: %s device\n", argv[0]);
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exit(1);
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}
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if (is_mounted(argv[1]))
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printf("\t%s is mounted.\n", argv[1]);
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exit(0);
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}
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#endif /* DEBUG */
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