summaryrefslogtreecommitdiffstats
path: root/libblkid/ismounted.c
diff options
context:
space:
mode:
Diffstat (limited to 'libblkid/ismounted.c')
-rw-r--r--libblkid/ismounted.c387
1 files changed, 0 insertions, 387 deletions
diff --git a/libblkid/ismounted.c b/libblkid/ismounted.c
deleted file mode 100644
index d9f1f57d0..000000000
--- a/libblkid/ismounted.c
+++ /dev/null
@@ -1,387 +0,0 @@
-/*
- * ismounted.c --- Check to see if the filesystem was mounted
- *
- * Copyright (C) 1995,1996,1997,1998,1999,2000,2008 Theodore Ts'o.
- *
- * This file may be redistributed under the terms of the GNU Public
- * License.
- */
-#include <stdio.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <fcntl.h>
-#ifdef HAVE_MNTENT_H
-#include <mntent.h>
-#endif
-#include <string.h>
-#include <sys/stat.h>
-#include <ctype.h>
-#include <sys/param.h>
-#ifdef __APPLE__
-#include <sys/ucred.h>
-#include <sys/mount.h>
-#endif
-
-#include "pathnames.h"
-#include "ismounted.h"
-#include "c.h"
-#ifdef __linux__
-# include "loopdev.h"
-#endif
-
-
-
-#ifdef HAVE_MNTENT_H
-/*
- * Helper function which checks a file in /etc/mtab format to see if a
- * filesystem is mounted. Returns an error if the file doesn't exist
- * or can't be opened.
- */
-static int check_mntent_file(const char *mtab_file, const char *file,
- int *mount_flags, char *mtpt, int mtlen)
-{
- struct mntent *mnt;
- struct stat st_buf;
- int retval = 0;
- dev_t file_dev=0, file_rdev=0;
- ino_t file_ino=0;
- FILE *f;
- int fd;
-
- *mount_flags = 0;
- if ((f = setmntent (mtab_file, "r")) == NULL)
- return errno;
-
- if (stat(file, &st_buf) == 0) {
- if (S_ISBLK(st_buf.st_mode)) {
-#ifndef __GNU__ /* The GNU hurd is broken with respect to stat devices */
- file_rdev = st_buf.st_rdev;
-#endif /* __GNU__ */
- } else {
- file_dev = st_buf.st_dev;
- file_ino = st_buf.st_ino;
- }
- }
-
- while ((mnt = getmntent (f)) != NULL) {
- if (mnt->mnt_fsname[0] != '/')
- continue;
- if (strcmp(file, mnt->mnt_fsname) == 0)
- break;
- if (stat(mnt->mnt_fsname, &st_buf) != 0)
- continue;
-
- if (S_ISBLK(st_buf.st_mode)) {
-#ifndef __GNU__
- if (file_rdev && file_rdev == st_buf.st_rdev)
- break;
-#ifdef __linux__
- /* maybe the file is loopdev backing file */
- if (file_dev
- && major(st_buf.st_rdev) == LOOPDEV_MAJOR
- && loopdev_is_used(mnt->mnt_fsname, file, 0, 0))
- break;
-#endif /* __linux__ */
-#endif /* __GNU__ */
- } else {
- if (file_dev && ((file_dev == st_buf.st_dev) &&
- (file_ino == st_buf.st_ino)))
- break;
- }
- }
-
- if (mnt == NULL) {
-#ifndef __GNU__ /* The GNU hurd is broken with respect to stat devices */
- /*
- * Do an extra check to see if this is the root device. We
- * can't trust /etc/mtab, and /proc/mounts will only list
- * /dev/root for the root filesystem. Argh. Instead we
- * check if the given device has the same major/minor number
- * as the device that the root directory is on.
- */
- if (file_rdev && stat("/", &st_buf) == 0 &&
- st_buf.st_dev == file_rdev) {
- *mount_flags = MF_MOUNTED;
- if (mtpt)
- strncpy(mtpt, "/", mtlen);
- goto is_root;
- }
-#endif /* __GNU__ */
- goto errout;
- }
-#ifndef __GNU__ /* The GNU hurd is deficient; what else is new? */
- /* Validate the entry in case /etc/mtab is out of date */
- /*
- * We need to be paranoid, because some broken distributions
- * (read: Slackware) don't initialize /etc/mtab before checking
- * all of the non-root filesystems on the disk.
- */
- if (stat(mnt->mnt_dir, &st_buf) < 0) {
- retval = errno;
- if (retval == ENOENT) {
-#ifdef DEBUG
- printf("Bogus entry in %s! (%s does not exist)\n",
- mtab_file, mnt->mnt_dir);
-#endif /* DEBUG */
- retval = 0;
- }
- goto errout;
- }
- if (file_rdev && (st_buf.st_dev != file_rdev)) {
-#ifdef DEBUG
- printf("Bogus entry in %s! (%s not mounted on %s)\n",
- mtab_file, file, mnt->mnt_dir);
-#endif /* DEBUG */
- goto errout;
- }
-#endif /* __GNU__ */
- *mount_flags = MF_MOUNTED;
-
-#ifdef MNTOPT_RO
- /* Check to see if the ro option is set */
- if (hasmntopt(mnt, MNTOPT_RO))
- *mount_flags |= MF_READONLY;
-#endif
-
- if (mtpt)
- strncpy(mtpt, mnt->mnt_dir, mtlen);
- /*
- * Check to see if we're referring to the root filesystem.
- * If so, do a manual check to see if we can open /etc/mtab
- * read/write, since if the root is mounted read/only, the
- * contents of /etc/mtab may not be accurate.
- */
- if (!strcmp(mnt->mnt_dir, "/")) {
-is_root:
-#define TEST_FILE "/.ismount-test-file"
- *mount_flags |= MF_ISROOT;
- fd = open(TEST_FILE, O_RDWR|O_CREAT, 0600);
- if (fd < 0) {
- if (errno == EROFS)
- *mount_flags |= MF_READONLY;
- } else
- close(fd);
- (void) unlink(TEST_FILE);
- }
- retval = 0;
-errout:
- endmntent (f);
- return retval;
-}
-
-static int check_mntent(const char *file, int *mount_flags,
- char *mtpt, int mtlen)
-{
- int retval;
-
-#ifdef DEBUG
- retval = check_mntent_file("/tmp/mtab", file, mount_flags,
- mtpt, mtlen);
- if (retval == 0)
- return 0;
-#endif /* DEBUG */
-#ifdef __linux__
- retval = check_mntent_file("/proc/mounts", file, mount_flags,
- mtpt, mtlen);
- if (retval == 0 && (*mount_flags != 0))
- return 0;
- if (access("/proc/mounts", R_OK) == 0) {
- *mount_flags = 0;
- return retval;
- }
-#endif /* __linux__ */
-#if defined(MOUNTED) || defined(_PATH_MOUNTED)
-#ifndef MOUNTED
-#define MOUNTED _PATH_MOUNTED
-#endif /* MOUNTED */
- retval = check_mntent_file(MOUNTED, file, mount_flags, mtpt, mtlen);
- return retval;
-#else
- *mount_flags = 0;
- return 0;
-#endif /* defined(MOUNTED) || defined(_PATH_MOUNTED) */
-}
-
-#else
-#if defined(HAVE_GETMNTINFO)
-
-static int check_getmntinfo(const char *file, int *mount_flags,
- char *mtpt, int mtlen)
-{
- struct statfs *mp;
- int len, n;
- const char *s1;
- char *s2;
-
- n = getmntinfo(&mp, MNT_NOWAIT);
- if (n == 0)
- return errno;
-
- len = sizeof(_PATH_DEV) - 1;
- s1 = file;
- if (strncmp(_PATH_DEV, s1, len) == 0)
- s1 += len;
-
- *mount_flags = 0;
- while (--n >= 0) {
- s2 = mp->f_mntfromname;
- if (strncmp(_PATH_DEV, s2, len) == 0) {
- s2 += len - 1;
- *s2 = 'r';
- }
- if (strcmp(s1, s2) == 0 || strcmp(s1, &s2[1]) == 0) {
- *mount_flags = MF_MOUNTED;
- break;
- }
- ++mp;
- }
- if (mtpt)
- strncpy(mtpt, mp->f_mntonname, mtlen);
- return 0;
-}
-#endif /* HAVE_GETMNTINFO */
-#endif /* HAVE_MNTENT_H */
-
-/*
- * Check to see if we're dealing with the swap device.
- */
-static int is_swap_device(const char *file)
-{
- FILE *f;
- char buf[1024], *cp;
- dev_t file_dev;
- struct stat st_buf;
- int ret = 0;
-
- file_dev = 0;
-#ifndef __GNU__ /* The GNU hurd is broken with respect to stat devices */
- if ((stat(file, &st_buf) == 0) &&
- S_ISBLK(st_buf.st_mode))
- file_dev = st_buf.st_rdev;
-#endif /* __GNU__ */
-
- if (!(f = fopen("/proc/swaps", "r")))
- return 0;
- /* Skip the first line */
- if (!fgets(buf, sizeof(buf), f))
- goto leave;
- if (*buf && strncmp(buf, "Filename\t", 9))
- /* Linux <=2.6.19 contained a bug in the /proc/swaps
- * code where the header would not be displayed
- */
- goto valid_first_line;
-
- while (fgets(buf, sizeof(buf), f)) {
-valid_first_line:
- if ((cp = strchr(buf, ' ')) != NULL)
- *cp = 0;
- if ((cp = strchr(buf, '\t')) != NULL)
- *cp = 0;
- if (strcmp(buf, file) == 0) {
- ret++;
- break;
- }
-#ifndef __GNU__
- if (file_dev && (stat(buf, &st_buf) == 0) &&
- S_ISBLK(st_buf.st_mode) &&
- file_dev == st_buf.st_rdev) {
- ret++;
- break;
- }
-#endif /* __GNU__ */
- }
-
-leave:
- fclose(f);
- return ret;
-}
-
-
-/*
- * check_mount_point() fills determines if the device is mounted or otherwise
- * busy, and fills in mount_flags with one or more of the following flags:
- * MF_MOUNTED, MF_ISROOT, MF_READONLY, MF_SWAP, and MF_BUSY. If mtpt is
- * non-NULL, the directory where the device is mounted is copied to where mtpt
- * is pointing, up to mtlen characters.
- */
-#ifdef __TURBOC__
- #pragma argsused
-#endif
-int check_mount_point(const char *device, int *mount_flags,
- char *mtpt, int mtlen)
-{
- struct stat st_buf;
- int retval = 0;
- int fd;
-
- if (is_swap_device(device)) {
- *mount_flags = MF_MOUNTED | MF_SWAP;
- strncpy(mtpt, "<swap>", mtlen);
- } else {
-#ifdef HAVE_MNTENT_H
- retval = check_mntent(device, mount_flags, mtpt, mtlen);
-#else
-#ifdef HAVE_GETMNTINFO
- retval = check_getmntinfo(device, mount_flags, mtpt, mtlen);
-#else
-#ifdef __GNUC__
- #warning "Can't use getmntent or getmntinfo to check for mounted filesystems!"
-#endif
- *mount_flags = 0;
-#endif /* HAVE_GETMNTINFO */
-#endif /* HAVE_MNTENT_H */
- }
- if (retval)
- return retval;
-
-#ifdef __linux__ /* This only works on Linux 2.6+ systems */
- if ((stat(device, &st_buf) != 0) ||
- !S_ISBLK(st_buf.st_mode))
- return 0;
- fd = open(device, O_RDONLY | O_EXCL);
- if (fd < 0) {
- if (errno == EBUSY)
- *mount_flags |= MF_BUSY;
- } else
- close(fd);
-#endif
-
- return 0;
-}
-
-int is_mounted(const char *file)
-{
- int retval;
- int mount_flags = 0;
-
- retval = check_mount_point(file, &mount_flags, NULL, 0);
- if (retval)
- return 0;
- return mount_flags & MF_MOUNTED;
-}
-
-#ifdef TEST_PROGRAM
-int main(int argc, char **argv)
-{
- int flags = 0;
- char devname[PATH_MAX];
-
- if (argc < 2) {
- fprintf(stderr, "Usage: %s device\n", argv[0]);
- return EXIT_FAILURE;
- }
-
- if (check_mount_point(argv[1], &flags, devname, sizeof(devname)) == 0 &&
- (flags & MF_MOUNTED)) {
- if (flags & MF_SWAP)
- printf("used swap device\n");
- else
- printf("mounted on %s\n", devname);
- return EXIT_SUCCESS;
- }
-
- printf("not mounted\n");
- return EXIT_FAILURE;
-}
-#endif /* DEBUG */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-23 11:06:36 +0100