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Viewing changes to lib/ismounted.c

  • Committer: Bazaar Package Importer
  • Author(s): Daniel Baumann
  • Date: 2011-07-10 17:10:21 UTC
  • mto: This revision was merged to the branch mainline in revision 9.
  • Revision ID: james.westby@ubuntu.com-20110710171021-xkbtr81jprb97iec
Tags: upstream-2.1.0~rc1
Import upstream version 2.1.0~rc1

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lib/ismounted.c
 
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/* check_mount() checks whether DEVICE is a mounted file system.
 
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   Returns 0 if the DEVICE is *not* mounted (which we consider a
 
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   successful outcome), and -1 if DEVICE is mounted or if the mount
 
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   status cannot be determined.
 
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   Derived from e2fsprogs/lib/ext2fs/ismounted.c
 
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   Copyright (C) 1995,1996,1997,1998,1999,2000 Theodore Ts'o,
 
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   LGPL v2
 
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*/
 
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#ifdef HAVE_CONFIG_H
 
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#include "config.h"
 
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#endif  /* HAVE_CONFIG_H */
 
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#include <stdio.h>
 
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#if HAVE_STDLIB_H
 
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#include <stdlib.h>
 
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#endif  /* HAVE_STDLIB_H */
 
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#if HAVE_STRING_H
 
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#include <string.h>
 
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#endif  /* HAVE_STRING_H */
 
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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 <sys/stat.h>
 
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#define MOUNTS                  "/etc/mtab"
 
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#define LINE_BUFFER_SIZE        256  /* Line buffer size for reading mtab */
 
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int check_mount(const char *device)
 
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{
 
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        struct mntent *mnt;
 
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        struct stat st_buf;
 
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        FILE *f;
 
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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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        f = setmntent(MOUNTS, "r");
 
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        if (f == NULL) {
 
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                fprintf(stderr, "Error: cannot open %s!", MOUNTS);
 
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                return -1;
 
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        }
 
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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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                        file_rdev = st_buf.st_rdev;
 
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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 ((mnt = getmntent(f)) != NULL) {
 
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                if (mnt->mnt_fsname[0] != '/')
 
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                        continue;
 
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                if (strcmp(device, mnt->mnt_fsname) == 0)
 
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                        break;
 
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                if (stat(mnt->mnt_fsname, &st_buf) == 0) {
 
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                        if (S_ISBLK(st_buf.st_mode)) {
 
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                                if (file_rdev && (file_rdev == st_buf.st_rdev))
 
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                                        break;
 
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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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        endmntent(f);
 
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        return (mnt == NULL) ? 0 : -1;
 
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}