path: root/m4/ls-mntd-fs.m4

#serial 19
# How to list mounted file systems.

# Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software
# Foundation, Inc.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any 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
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

dnl From Jim Meyering.
dnl
dnl This is not pretty.  I've just taken the autoconf code and wrapped
dnl it in an AC_DEFUN and made some other fixes.
dnl

# Replace Autoconf's AC_FUNC_GETMNTENT to work around a bug in Autoconf
# through Autoconf 2.59.  We can remove this once we assume Autoconf 2.60
# or later.
AC_DEFUN([AC_FUNC_GETMNTENT],
[# getmntent is in the standard C library on UNICOS, in -lsun on Irix 4,
# -lseq on Dynix/PTX, -lgen on Unixware.
AC_SEARCH_LIBS(getmntent, [sun seq gen], [AC_CHECK_FUNCS(getmntent)])
])

# gl_LIST_MOUNTED_FILE_SYSTEMS([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
AC_DEFUN([gl_LIST_MOUNTED_FILE_SYSTEMS],
  [
AC_CHECK_FUNCS(listmntent getmntinfo)
AC_CHECK_HEADERS_ONCE(sys/param.h)

# We must include grp.h before ucred.h on OSF V4.0, since ucred.h uses
# NGROUPS (as the array dimension for a struct member) without a definition.
AC_CHECK_HEADERS(sys/ucred.h, [], [], [#include <grp.h>])

AC_CHECK_HEADERS(sys/mount.h, [], [],
  [AC_INCLUDES_DEFAULT
   [#if HAVE_SYS_PARAM_H
     #include <sys/param.h>
    #endif]])

AC_CHECK_HEADERS(mntent.h sys/fs_types.h)
    getfsstat_includes="\
$ac_includes_default
#if HAVE_SYS_PARAM_H
# include <sys/param.h> /* needed by powerpc-apple-darwin1.3.7 */
#endif
#if HAVE_SYS_UCRED_H
# include <grp.h> /* needed for definition of NGROUPS */
# include <sys/ucred.h> /* needed by powerpc-apple-darwin1.3.7 */
#endif
#if HAVE_SYS_MOUNT_H
# include <sys/mount.h>
#endif
#if HAVE_SYS_FS_TYPES_H
# include <sys/fs_types.h> /* needed by powerpc-apple-darwin1.3.7 */
#endif
"
AC_CHECK_MEMBERS([struct fsstat.f_fstypename],,,[$getfsstat_includes])

# Determine how to get the list of mounted file systems.
ac_list_mounted_fs=

# If the getmntent function is available but not in the standard library,
# make sure LIBS contains the appropriate -l option.
AC_FUNC_GETMNTENT

# This test must precede the ones for getmntent because Unicos-9 is
# reported to have the getmntent function, but its support is incompatible
# with other getmntent implementations.

# NOTE: Normally, I wouldn't use a check for system type as I've done for
# `CRAY' below since that goes against the whole autoconf philosophy.  But
# I think there is too great a chance that some non-Cray system has a
# function named listmntent to risk the false positive.

if test -z "$ac_list_mounted_fs"; then
  # Cray UNICOS 9
  AC_MSG_CHECKING([for listmntent of Cray/Unicos-9])
  AC_CACHE_VAL(fu_cv_sys_mounted_cray_listmntent,
    [fu_cv_sys_mounted_cray_listmntent=no
      AC_EGREP_CPP(yes,
        [#ifdef _CRAY
yes
#endif
        ], [test $ac_cv_func_listmntent = yes \
	    && fu_cv_sys_mounted_cray_listmntent=yes]
      )
    ]
  )
  AC_MSG_RESULT($fu_cv_sys_mounted_cray_listmntent)
  if test $fu_cv_sys_mounted_cray_listmntent = yes; then
    ac_list_mounted_fs=found
    AC_DEFINE(MOUNTED_LISTMNTENT, 1,
      [Define if there is a function named listmntent that can be used to
       list all mounted file systems.  (UNICOS)])
  fi
fi

if test -z "$ac_list_mounted_fs"; then
  # AIX.
  AC_MSG_CHECKING([for mntctl function and struct vmount])
  AC_CACHE_VAL(fu_cv_sys_mounted_vmount,
  [AC_TRY_CPP([#include <fshelp.h>],
    fu_cv_sys_mounted_vmount=yes,
    fu_cv_sys_mounted_vmount=no)])
  AC_MSG_RESULT($fu_cv_sys_mounted_vmount)
  if test $fu_cv_sys_mounted_vmount = yes; then
    ac_list_mounted_fs=found
    AC_DEFINE(MOUNTED_VMOUNT, 1,
	[Define if there is a function named mntctl that can be used to read
         the list of mounted file systems, and there is a system header file
         that declares `struct vmount.'  (AIX)])
  fi
fi

if test $ac_cv_func_getmntent = yes; then

  # This system has the getmntent function.
  # Determine whether it's the one-argument variant or the two-argument one.

  if test -z "$ac_list_mounted_fs"; then
    # 4.3BSD, SunOS, HP-UX, Dynix, Irix
    AC_MSG_CHECKING([for one-argument getmntent function])
    AC_CACHE_VAL(fu_cv_sys_mounted_getmntent1,
		 [AC_TRY_COMPILE([
/* SunOS 4.1.x /usr/include/mntent.h needs this for FILE */
#include <stdio.h>

#include <mntent.h>
#if !defined MOUNTED
# if defined _PATH_MOUNTED	/* GNU libc  */
#  define MOUNTED _PATH_MOUNTED
# endif
# if defined MNT_MNTTAB	/* HP-UX.  */
#  define MOUNTED MNT_MNTTAB
# endif
# if defined MNTTABNAME	/* Dynix.  */
#  define MOUNTED MNTTABNAME
# endif
#endif
],
                    [ struct mntent *mnt = 0; char *table = MOUNTED; ],
		    fu_cv_sys_mounted_getmntent1=yes,
		    fu_cv_sys_mounted_getmntent1=no)])
    AC_MSG_RESULT($fu_cv_sys_mounted_getmntent1)
    if test $fu_cv_sys_mounted_getmntent1 = yes; then
      ac_list_mounted_fs=found
      AC_DEFINE(MOUNTED_GETMNTENT1, 1,
        [Define if there is a function named getmntent for reading the list
         of mounted file systems, and that function takes a single argument.
         (4.3BSD, SunOS, HP-UX, Dynix, Irix)])
    fi
  fi

  if test -z "$ac_list_mounted_fs"; then
    # SVR4
    AC_MSG_CHECKING([for two-argument getmntent function])
    AC_CACHE_VAL(fu_cv_sys_mounted_getmntent2,
    [AC_EGREP_HEADER(getmntent, sys/mnttab.h,
      fu_cv_sys_mounted_getmntent2=yes,
      fu_cv_sys_mounted_getmntent2=no)])
    AC_MSG_RESULT($fu_cv_sys_mounted_getmntent2)
    if test $fu_cv_sys_mounted_getmntent2 = yes; then
      ac_list_mounted_fs=found
      AC_DEFINE(MOUNTED_GETMNTENT2, 1,
        [Define if there is a function named getmntent for reading the list of
         mounted file systems, and that function takes two arguments.  (SVR4)])
    fi
  fi

fi

if test -z "$ac_list_mounted_fs"; then
  # DEC Alpha running OSF/1, and Apple Darwin 1.3.
  # powerpc-apple-darwin1.3.7 needs sys/param.h sys/ucred.h sys/fs_types.h

  AC_MSG_CHECKING([for getfsstat function])
  AC_CACHE_VAL(fu_cv_sys_mounted_getfsstat,
  [AC_TRY_LINK([
#include <sys/types.h>
#if HAVE_STRUCT_FSSTAT_F_FSTYPENAME
# define FS_TYPE(Ent) ((Ent).f_fstypename)
#else
# define FS_TYPE(Ent) mnt_names[(Ent).f_type]
#endif
]$getfsstat_includes
,
  [struct statfs *stats;
   int numsys = getfsstat ((struct statfs *)0, 0L, MNT_WAIT);
   char *t = FS_TYPE (*stats); ],
    fu_cv_sys_mounted_getfsstat=yes,
    fu_cv_sys_mounted_getfsstat=no)])
  AC_MSG_RESULT($fu_cv_sys_mounted_getfsstat)
  if test $fu_cv_sys_mounted_getfsstat = yes; then
    ac_list_mounted_fs=found
    AC_DEFINE(MOUNTED_GETFSSTAT, 1,
	      [Define if there is a function named getfsstat for reading the
               list of mounted file systems.  (DEC Alpha running OSF/1)])
  fi
fi

if test -z "$ac_list_mounted_fs"; then
  # SVR3
  AC_MSG_CHECKING([for FIXME existence of three headers])
  AC_CACHE_VAL(fu_cv_sys_mounted_fread_fstyp,
    [AC_TRY_CPP([
#include <sys/statfs.h>
#include <sys/fstyp.h>
#include <mnttab.h>],
		fu_cv_sys_mounted_fread_fstyp=yes,
		fu_cv_sys_mounted_fread_fstyp=no)])
  AC_MSG_RESULT($fu_cv_sys_mounted_fread_fstyp)
  if test $fu_cv_sys_mounted_fread_fstyp = yes; then
    ac_list_mounted_fs=found
    AC_DEFINE(MOUNTED_FREAD_FSTYP, 1,
      [Define if (like SVR2) there is no specific function for reading the
       list of mounted file systems, and your system has these header files:
       <sys/fstyp.h> and <sys/statfs.h>.  (SVR3)])
  fi
fi

if test -z "$ac_list_mounted_fs"; then
  # 4.4BSD and DEC OSF/1.
  AC_MSG_CHECKING([for getmntinfo function])
  AC_CACHE_VAL(fu_cv_sys_mounted_getmntinfo,
    [
      test "$ac_cv_func_getmntinfo" = yes \
	  && fu_cv_sys_mounted_getmntinfo=yes \
	  || fu_cv_sys_mounted_getmntinfo=no
    ])
  AC_MSG_RESULT($fu_cv_sys_mounted_getmntinfo)
  if test $fu_cv_sys_mounted_getmntinfo = yes; then
    ac_list_mounted_fs=found
    AC_DEFINE(MOUNTED_GETMNTINFO, 1,
	      [Define if there is a function named getmntinfo for reading the
               list of mounted file systems.  (4.4BSD, Darwin)])
  fi
fi

if test -z "$ac_list_mounted_fs"; then
  # Ultrix
  AC_MSG_CHECKING([for getmnt function])
  AC_CACHE_VAL(fu_cv_sys_mounted_getmnt,
    [AC_TRY_CPP([
#include <sys/fs_types.h>
#include <sys/mount.h>],
		fu_cv_sys_mounted_getmnt=yes,
		fu_cv_sys_mounted_getmnt=no)])
  AC_MSG_RESULT($fu_cv_sys_mounted_getmnt)
  if test $fu_cv_sys_mounted_getmnt = yes; then
    ac_list_mounted_fs=found
    AC_DEFINE(MOUNTED_GETMNT, 1,
      [Define if there is a function named getmnt for reading the list of
       mounted file systems.  (Ultrix)])
  fi
fi

if test -z "$ac_list_mounted_fs"; then
  # BeOS
  AC_CHECK_FUNCS(next_dev fs_stat_dev)
  AC_CHECK_HEADERS(fs_info.h)
  AC_MSG_CHECKING([for BEOS mounted file system support functions])
  if test $ac_cv_header_fs_info_h = yes \
      && test $ac_cv_func_next_dev = yes \
	&& test $ac_cv_func_fs_stat_dev = yes; then
    fu_result=yes
  else
    fu_result=no
  fi
  AC_MSG_RESULT($fu_result)
  if test $fu_result = yes; then
    ac_list_mounted_fs=found
    AC_DEFINE(MOUNTED_FS_STAT_DEV, 1,
      [Define if there are functions named next_dev and fs_stat_dev for
       reading the list of mounted file systems.  (BeOS)])
  fi
fi

if test -z "$ac_list_mounted_fs"; then
  # SVR2
  AC_MSG_CHECKING([whether it is possible to resort to fread on /etc/mnttab])
  AC_CACHE_VAL(fu_cv_sys_mounted_fread,
    [AC_TRY_CPP([#include <mnttab.h>],
		fu_cv_sys_mounted_fread=yes,
		fu_cv_sys_mounted_fread=no)])
  AC_MSG_RESULT($fu_cv_sys_mounted_fread)
  if test $fu_cv_sys_mounted_fread = yes; then
    ac_list_mounted_fs=found
    AC_DEFINE(MOUNTED_FREAD, 1,
	      [Define if there is no specific function for reading the list of
               mounted file systems.  fread will be used to read /etc/mnttab.
               (SVR2) ])
  fi
fi

if test -z "$ac_list_mounted_fs"; then
  AC_MSG_ERROR([could not determine how to read list of mounted file systems])
  # FIXME -- no need to abort building the whole package
  # Can't build mountlist.c or anything that needs its functions
fi

AS_IF([test $ac_list_mounted_fs = found], [$1], [$2])

  ])