| /* |
| * ismounted.c --- Check to see if the filesystem was mounted |
| * |
| * Copyright (C) 1995 Theodore Ts'o. |
| * |
| * %Begin-Header% |
| * This file may be redistributed under the terms of the GNU Public |
| * License. |
| * %End-Header% |
| */ |
| |
| #include <stdio.h> |
| #if HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| #if HAVE_STDLIB_H |
| #include <stdlib.h> |
| #endif |
| #include <fcntl.h> |
| #ifdef HAVE_LINUX_FS_H |
| #include <linux/fs.h> |
| #endif |
| #ifdef HAVE_LINUX_FD_H |
| #include <linux/fd.h> |
| #endif |
| #ifdef HAVE_MNTENT_H |
| #include <mntent.h> |
| #endif |
| #ifdef HAVE_GETMNTINFO |
| #include <paths.h> |
| #include <sys/param.h> |
| #include <sys/mount.h> |
| #endif /* HAVE_GETMNTINFO */ |
| |
| #include <linux/ext2_fs.h> |
| #include "ext2fs.h" |
| |
| #ifdef HAVE_MNTENT_H |
| /* |
| * XXX we only check to see if the mount is readonly when it's the |
| * root filesystem. |
| */ |
| static errcode_t check_mntent(const char *file, int *mount_flags) |
| { |
| FILE * f; |
| struct mntent * mnt; |
| int fd; |
| |
| *mount_flags = 0; |
| if ((f = setmntent (MOUNTED, "r")) == NULL) |
| return errno; |
| while ((mnt = getmntent (f)) != NULL) |
| if (strcmp(file, mnt->mnt_fsname) == 0) |
| break; |
| endmntent (f); |
| if (mnt == 0) |
| return 0; |
| *mount_flags = EXT2_MF_MOUNTED; |
| |
| if (!strcmp(mnt->mnt_dir, "/")) { |
| *mount_flags |= EXT2_MF_ISROOT; |
| fd = open(MOUNTED, O_RDWR); |
| if (fd < 0) { |
| if (errno == EROFS) |
| *mount_flags |= EXT2_MF_READONLY; |
| } else |
| close(fd); |
| } |
| return 0; |
| } |
| #endif |
| |
| #ifdef HAVE_GETMNTINFO |
| static errcode_t check_getmntinfo(const char *file, int *mount_flags) |
| { |
| 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 = EXT2_MF_MOUNTED; |
| break; |
| } |
| ++mp; |
| } |
| return 0; |
| } |
| #endif /* HAVE_GETMNTINFO */ |
| |
| /* |
| * Is_mounted is set to 1 if the device is mounted, 0 otherwise |
| */ |
| #ifdef __TURBOC__ |
| #pragma argsused |
| #endif |
| errcode_t ext2fs_check_if_mounted(const char *file, int *mount_flags) |
| { |
| #ifdef HAVE_MNTENT_H |
| return check_mntent(file, mount_flags); |
| #else |
| #ifdef HAVE_GETMNTINFO |
| return check_getmntinfo(file, mount_flags); |
| #else |
| *mount_flags = 0; |
| return 0; |
| #endif /* HAVE_GETMNTINFO */ |
| #endif /* HAVE_MNTENT_H */ |
| } |