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/*********************************************************
* Copyright (C) 2006 VMware, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation version 2.1 and no later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the Lesser GNU General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
*********************************************************/
/*
* mntinfo.h --
*
* Macros to abstract differences between structures and functions used in
* accessing information about mounted file systems.
*
*/
#ifndef __MNTINFO_H__
#define __MNTINFO_H__
#ifdef sun
# include <sys/mnttab.h>
# include <libgen.h>
# include <limits.h>
#elif defined(__linux__)
# include <mntent.h>
#elif defined(__FreeBSD__)
# include <sys/mount.h>
#endif
#include "posix.h"
/*
*----------------------------------------------------------------------------
*
* DECLARE_MNTINFO, MNTINFO
* OPEN_MNTFILE, GETNEXT_MNTINFO, CLOSE_MNTFILE,
* MNTINFO_NAME, MNTINFO_FSTYPE, MNTINFO_MNTPT --
*
* Cross-platform macros for accessing information about the mounted file
* systems. This is necessary since the interfaces for getmntent(3) are
* slightly different on Linux and Solaris.
*
* DECLARE_MNTINFO() is used to declare the variable used when invoking
* GETNEXT_MNTINFO(). MNTINFO is the type that can be used when passing
* between functions.
*
* OPEN_MNTFILE() and CLOSE_MNTFILE() must be called before and after
* a series of GETNEXT_MNTINFO() calls, respectively. GETNEXT_MNTINFO() is
* called successively to retrieve information about the next mounted file
* system.
*
* MNTINFO_NAME, MNTINFO_FSTYPE, and MNTINFO_MNTPT retrieve the name, file
* system type, and mount point of the provided MNTINFO, respectively.
*
* MNTFILE is a string with the name of the file containing mount
* information.
*
* Results:
* OPEN_MNTFILE: MNTHANDLE on success, NULL on failure
* GETNEXT_MNTINFO: on success, TRUE and mnt is filled with file system's
* information; FALSE when no mounts left or on failure
* CLOSE_MNTFILE: TRUE on success, FALSE on failure
*
* MNTINFO_NAME: mount's name on success, NULL on failure
* MNTINFO_FSTYPE: mount's file system type on success, NULL on failure
* MNTINFO_MNTPT: mount's mount point on success, NULL on failure
*
* Side effects:
* None.
*
*----------------------------------------------------------------------------
*/
#ifdef sun
# define MNTFILE MNTTAB
# define MNTHANDLE FILE *
# define MNTINFO struct mnttab
# define DECLARE_MNTINFO(name) struct mnttab __ ## name; \
struct mnttab *name = &__ ## name
# define OPEN_MNTFILE(mode) Posix_Fopen(MNTFILE, mode)
# define GETNEXT_MNTINFO(fp, mnt) (Posix_Getmntent(fp, mnt) == 0)
# define CLOSE_MNTFILE(fp) (fclose(fp) == 0)
# define MNTINFO_NAME(mnt) mnt->mnt_special
# define MNTINFO_FSTYPE(mnt) mnt->mnt_fstype
# define MNTINFO_MNTPT(mnt) mnt->mnt_mountp
# define MNTINFO_MNT_IS_RO(mnt) (hasmntopt((mnt), "rw") == NULL)
#elif defined(__linux__)
# define MNTFILE MOUNTED
# define MNTHANDLE FILE *
# define MNTINFO struct mntent
# define DECLARE_MNTINFO(name) struct mntent *name
# define OPEN_MNTFILE(mode) Posix_Setmntent(MNTFILE, mode)
# define GETNEXT_MNTINFO(fp, mnt) ((mnt = Posix_Getmntent(fp)) != NULL)
# define CLOSE_MNTFILE(fp) (endmntent(fp) == 1)
# define MNTINFO_NAME(mnt) mnt->mnt_fsname
# define MNTINFO_FSTYPE(mnt) mnt->mnt_type
# define MNTINFO_MNTPT(mnt) mnt->mnt_dir
# define MNTINFO_MNT_IS_RO(mnt) (hasmntopt((mnt), "rw") == NULL)
#elif defined(__FreeBSD__) || defined(__APPLE__)
struct mntHandle {
struct statfs *mountPoints; // array of mountpoints per getmntinfo(3)
int numMountPoints; // number of elements in mntArray
int mountIndex; // current location within mountPoints array
};
# define MNTFILE _PATH_FSTAB
# define MNTHANDLE struct mntHandle *
# define MNTINFO struct statfs
# define DECLARE_MNTINFO(name) struct statfs __ ## name; \
struct statfs *name = &__ ## name
# define OPEN_MNTFILE(mode) \
({ \
MNTHANDLE mntHandle; \
mntHandle = malloc(sizeof *mntHandle); \
if (mntHandle != NULL) { \
mntHandle->numMountPoints = getmntinfo(&mntHandle->mountPoints, \
MNT_NOWAIT); \
mntHandle->mountIndex = 0; \
} \
mntHandle; \
})
# define GETNEXT_MNTINFO(mntHandle, mnt) \
({ \
/* Avoid multiple evaluations/expansions. */ \
MNTHANDLE thisHandle = (mntHandle); \
MNTINFO *thisMnt = (mnt); \
Bool boolVal = FALSE; \
ASSERT(thisHandle); \
if (thisHandle->mountIndex < thisHandle->numMountPoints) { \
memcpy(thisMnt, \
&thisHandle->mountPoints[thisHandle->mountIndex], \
sizeof *thisMnt); \
++thisHandle->mountIndex; \
boolVal = TRUE; \
} \
boolVal; \
})
# define CLOSE_MNTFILE(mntHandle) \
({ \
free(mntHandle); \
TRUE; \
})
# define MNTINFO_NAME(mnt) mnt->f_mntfromname
# define MNTINFO_FSTYPE(mnt) mnt->f_fstypename
# define MNTINFO_MNTPT(mnt) mnt->f_mntonname
# define MNTINFO_MNT_IS_RO(mnt) ((mnt)->f_flags & MNT_RDONLY)
#else
# error "Define mount information macros for your OS type"
#endif
#endif /* __MNTINFO_H__ */
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