mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-11-23 19:59:41 +00:00
69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Utility routines.
|
|
*
|
|
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
|
*/
|
|
#include "libbb.h"
|
|
#include <mntent.h>
|
|
|
|
/*
|
|
* Given a block device, find the mount table entry if that block device
|
|
* is mounted.
|
|
*
|
|
* Given any other file (or directory), find the mount table entry for its
|
|
* filesystem.
|
|
*/
|
|
struct mntent* FAST_FUNC find_mount_point(const char *name, int subdir_too)
|
|
{
|
|
struct stat s;
|
|
FILE *mtab_fp;
|
|
struct mntent *mountEntry;
|
|
dev_t devno_of_name;
|
|
bool block_dev;
|
|
|
|
if (stat(name, &s) != 0)
|
|
return NULL;
|
|
|
|
devno_of_name = s.st_dev;
|
|
block_dev = 0;
|
|
/* Why S_ISCHR? - UBI volumes use char devices, not block */
|
|
if (S_ISBLK(s.st_mode) || S_ISCHR(s.st_mode)) {
|
|
devno_of_name = s.st_rdev;
|
|
block_dev = 1;
|
|
}
|
|
|
|
mtab_fp = setmntent(bb_path_mtab_file, "r");
|
|
if (!mtab_fp)
|
|
return NULL;
|
|
|
|
while ((mountEntry = getmntent(mtab_fp)) != NULL) {
|
|
/* rootfs mount in Linux 2.6 exists always,
|
|
* and it makes sense to always ignore it.
|
|
* Otherwise people can't reference their "real" root! */
|
|
if (ENABLE_FEATURE_SKIP_ROOTFS && strcmp(mountEntry->mnt_fsname, "rootfs") == 0)
|
|
continue;
|
|
|
|
if (strcmp(name, mountEntry->mnt_dir) == 0
|
|
|| strcmp(name, mountEntry->mnt_fsname) == 0
|
|
) { /* String match. */
|
|
break;
|
|
}
|
|
|
|
if (!(subdir_too || block_dev))
|
|
continue;
|
|
|
|
/* Is device's dev_t == name's dev_t? */
|
|
if (stat(mountEntry->mnt_fsname, &s) == 0 && s.st_rdev == devno_of_name)
|
|
break;
|
|
/* Match the directory's mount point. */
|
|
if (stat(mountEntry->mnt_dir, &s) == 0 && s.st_dev == devno_of_name)
|
|
break;
|
|
}
|
|
endmntent(mtab_fp);
|
|
|
|
return mountEntry;
|
|
}
|