mirror of https://github.com/vitalif/e2fsprogs
126 lines
2.5 KiB
C
126 lines
2.5 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 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 <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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#if HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef 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_FS_H
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#include <linux/fs.h>
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#endif
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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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#ifdef HAVE_GETMNTINFO
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#include <paths.h>
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#include <sys/param.h>
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#include <sys/mount.h>
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#endif /* HAVE_GETMNTINFO */
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#include <linux/ext2_fs.h>
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#include "ext2fs.h"
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#ifdef HAVE_MNTENT_H
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/*
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* XXX we only check to see if the mount is readonly when it's the
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* root filesystem.
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*/
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static errcode_t check_mntent(const char *file, int *mount_flags)
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{
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FILE * f;
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struct mntent * mnt;
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int fd;
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*mount_flags = 0;
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if ((f = setmntent (MOUNTED, "r")) == NULL)
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return errno;
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while ((mnt = getmntent (f)) != NULL)
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if (strcmp(file, mnt->mnt_fsname) == 0)
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break;
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endmntent (f);
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if (mnt == 0)
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return 0;
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*mount_flags = EXT2_MF_MOUNTED;
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if (!strcmp(mnt->mnt_dir, "/")) {
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*mount_flags |= EXT2_MF_ISROOT;
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fd = open(MOUNTED, O_RDWR);
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if (fd < 0) {
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if (errno == EROFS)
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*mount_flags |= EXT2_MF_READONLY;
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} else
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close(fd);
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}
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return 0;
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}
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#endif
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#ifdef HAVE_GETMNTINFO
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static errcode_t check_getmntinfo(const char *file, int *mount_flags)
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{
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struct statfs *mp;
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int len, n;
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const char *s1;
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char *s2;
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n = getmntinfo(&mp, MNT_NOWAIT);
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if (n == 0)
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return errno;
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len = sizeof(_PATH_DEV) - 1;
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s1 = file;
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if (strncmp(_PATH_DEV, s1, len) == 0)
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s1 += len;
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*mount_flags = 0;
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while (--n >= 0) {
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s2 = mp->f_mntfromname;
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if (strncmp(_PATH_DEV, s2, len) == 0) {
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s2 += len - 1;
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*s2 = 'r';
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}
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if (strcmp(s1, s2) == 0 || strcmp(s1, &s2[1]) == 0) {
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*mount_flags = EXT2_MF_MOUNTED;
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break;
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}
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++mp;
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}
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return 0;
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}
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#endif /* HAVE_GETMNTINFO */
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/*
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* Is_mounted is set to 1 if the device is mounted, 0 otherwise
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*/
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errcode_t ext2fs_check_if_mounted(const char *file, int *mount_flags)
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{
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#ifdef HAVE_MNTENT_H
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return check_mntent(file, mount_flags);
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#else
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#ifdef HAVE_GETMNTINFO
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return check_getmntinfo(file, mount_flags);
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#else
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*mount_flags = 0;
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return 0;
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#endif /* HAVE_GETMNTINFO */
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#endif /* HAVE_MNTENT_H */
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}
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