code.delx.au - gnu-emacs/blob - m4/acl.m4

   1 # acl.m4 - check for access control list (ACL) primitives
   2 # serial 22
   3
   4 # Copyright (C) 2002, 2004-2016 Free Software Foundation, Inc.
   5 # This file is free software; the Free Software Foundation
   6 # gives unlimited permission to copy and/or distribute it,
   7 # with or without modifications, as long as this notice is preserved.
   8
   9 # Written by Paul Eggert and Jim Meyering.
  10
  11 AC_DEFUN([gl_FUNC_ACL_ARG],
  12 [
  13   gl_need_lib_has_acl=
  14   AC_ARG_ENABLE([acl],
  15     AS_HELP_STRING([--disable-acl], [do not support ACLs]),
  16     , [enable_acl=auto])
  17 ])
  18
  19
  20 AC_DEFUN([gl_FUNC_ACL],
  21 [
  22   AC_REQUIRE([gl_FUNC_ACL_ARG])
  23   AC_CHECK_FUNCS_ONCE([fchmod])
  24   LIB_ACL=
  25   use_acl=0
  26   if test "$enable_acl" != no; then
  27     dnl On all platforms, the ACL related API is declared in <sys/acl.h>.
  28     AC_CHECK_HEADERS([sys/acl.h])
  29     if test $ac_cv_header_sys_acl_h = yes; then
  30       ac_save_LIBS=$LIBS
  31
  32       dnl Test for POSIX-draft-like API (GNU/Linux, FreeBSD, Mac OS X,
  33       dnl IRIX, Tru64).  -lacl is needed on GNU/Linux, -lpacl on OSF/1.
  34       if test $use_acl = 0; then
  35         AC_SEARCH_LIBS([acl_get_file], [acl pacl],
  36           [if test "$ac_cv_search_acl_get_file" != "none required"; then
  37              LIB_ACL=$ac_cv_search_acl_get_file
  38            fi
  39            AC_CHECK_FUNCS(
  40              [acl_get_file acl_get_fd acl_set_file acl_set_fd \
  41               acl_free acl_from_mode acl_from_text \
  42               acl_delete_def_file acl_extended_file \
  43               acl_delete_fd_np acl_delete_file_np \
  44               acl_copy_ext_native acl_create_entry_np \
  45               acl_to_short_text acl_free_text])
  46            # If the acl_get_file bug is detected, don't enable the ACL support.
  47            gl_ACL_GET_FILE([use_acl=1], [])
  48            if test $use_acl = 1; then
  49              dnl On GNU/Linux, an additional API is declared in <acl/libacl.h>.
  50              AC_CHECK_HEADERS([acl/libacl.h])
  51              AC_REPLACE_FUNCS([acl_entries])
  52              AC_CACHE_CHECK([for ACL_FIRST_ENTRY],
  53                [gl_cv_acl_ACL_FIRST_ENTRY],
  54                [AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
  55 [[#include <sys/types.h>
  56 #include <sys/acl.h>
  57 int type = ACL_FIRST_ENTRY;]])],
  58                   [gl_cv_acl_ACL_FIRST_ENTRY=yes],
  59                   [gl_cv_acl_ACL_FIRST_ENTRY=no])])
  60              if test $gl_cv_acl_ACL_FIRST_ENTRY = yes; then
  61                AC_DEFINE([HAVE_ACL_FIRST_ENTRY], [1],
  62                  [Define to 1 if the constant ACL_FIRST_ENTRY exists.])
  63              fi
  64              dnl On Mac OS X, other types of ACLs are supported.
  65              AC_CACHE_CHECK([for ACL_TYPE_EXTENDED],
  66                [gl_cv_acl_ACL_TYPE_EXTENDED],
  67                [AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
  68 [[#include <sys/types.h>
  69 #include <sys/acl.h>
  70 int type = ACL_TYPE_EXTENDED;]])],
  71                   [gl_cv_acl_ACL_TYPE_EXTENDED=yes],
  72                   [gl_cv_acl_ACL_TYPE_EXTENDED=no])])
  73              if test $gl_cv_acl_ACL_TYPE_EXTENDED = yes; then
  74                AC_DEFINE([HAVE_ACL_TYPE_EXTENDED], [1],
  75                  [Define to 1 if the ACL type ACL_TYPE_EXTENDED exists.])
  76              fi
  77            else
  78              LIB_ACL=
  79            fi
  80           ])
  81       fi
  82
  83       dnl Test for Solaris API (Solaris, Cygwin).
  84       if test $use_acl = 0; then
  85         AC_CHECK_FUNCS([facl])
  86         if test $ac_cv_func_facl = yes; then
  87           AC_SEARCH_LIBS([acl_trivial], [sec],
  88             [if test "$ac_cv_search_acl_trivial" != "none required"; then
  89                LIB_ACL=$ac_cv_search_acl_trivial
  90              fi
  91             ])
  92           AC_CHECK_FUNCS([acl_trivial])
  93           use_acl=1
  94         fi
  95       fi
  96
  97       dnl Test for HP-UX API.
  98       if test $use_acl = 0; then
  99         AC_CHECK_FUNCS([getacl])
 100         if test $ac_cv_func_getacl = yes; then
 101           use_acl=1
 102         fi
 103         dnl Test for HP-UX 11.11 API.
 104         AC_CHECK_HEADERS([aclv.h], [], [], [#include <sys/types.h>])
 105       fi
 106
 107       dnl Test for AIX API (AIX 5.3 or newer).
 108       if test $use_acl = 0; then
 109         AC_CHECK_FUNCS([aclx_get])
 110         if test $ac_cv_func_aclx_get = yes; then
 111           use_acl=1
 112         fi
 113       fi
 114
 115       dnl Test for older AIX API.
 116       if test $use_acl = 0 || test "$ac_cv_func_aclx_get" = yes; then
 117         AC_CHECK_FUNCS([statacl])
 118         if test $ac_cv_func_statacl = yes; then
 119           use_acl=1
 120         fi
 121       fi
 122
 123       dnl Test for NonStop Kernel API.
 124       if test $use_acl = 0; then
 125         AC_CHECK_FUNCS([aclsort])
 126         if test $ac_cv_func_aclsort = yes; then
 127           use_acl=1
 128         fi
 129       fi
 130
 131       LIBS=$ac_save_LIBS
 132     fi
 133
 134     if test "$enable_acl$use_acl" = yes0; then
 135       AC_MSG_ERROR([ACLs enabled but support not detected])
 136     elif test "$enable_acl$use_acl" = auto0; then
 137       AC_MSG_WARN([libacl development library was not found or not usable.])
 138       AC_MSG_WARN([AC_PACKAGE_NAME will be built without ACL support.])
 139     fi
 140   fi
 141   test $gl_need_lib_has_acl && LIB_HAS_ACL=$LIB_ACL
 142   AC_SUBST([LIB_ACL])
 143   AC_DEFINE_UNQUOTED([USE_ACL], [$use_acl],
 144     [Define to nonzero if you want access control list support.])
 145   USE_ACL=$use_acl
 146   AC_SUBST([USE_ACL])
 147 ])
 148
 149 # gl_ACL_GET_FILE(IF-WORKS, IF-NOT)
 150 # ---------------------------------
 151 # If 'acl_get_file' works (does not have a particular bug),
 152 # run IF-WORKS, otherwise, IF-NOT.
 153 # When building natively, test for a Darwin 8.7.0 bug, whereby acl_get_file
 154 # returns NULL, but sets errno = ENOENT for an existing file or directory.
 155 # When cross-compiling, assume that this old bug no longer applies.
 156 AC_DEFUN([gl_ACL_GET_FILE],
 157 [
 158   AC_CACHE_CHECK([for working acl_get_file], [gl_cv_func_working_acl_get_file],
 159     [gl_cv_func_working_acl_get_file=no
 160      AC_LINK_IFELSE(
 161        [AC_LANG_PROGRAM(
 162           [[#include <sys/types.h>
 163            #include <sys/acl.h>
 164            #include <errno.h>
 165           ]],
 166           [[acl_t acl = acl_get_file (".", ACL_TYPE_ACCESS);
 167             return acl ? acl_free (acl) != 0 : errno == ENOENT;
 168           ]])],
 169        [if test $cross_compiling = yes; then
 170           gl_cv_func_working_acl_get_file="guessing yes"
 171         elif ./conftest$ac_exeext; then
 172           gl_cv_func_working_acl_get_file=yes
 173         fi])])
 174   AS_IF([test "$gl_cv_func_working_acl_get_file" != no], [$1], [$2])
 175 ])
 176
 177 # On GNU/Linux, testing if a file has an acl can be done with the getxattr
 178 # syscall which doesn't require linking against additional libraries.
 179 AC_DEFUN([gl_FILE_HAS_ACL],
 180 [
 181   AC_REQUIRE([gl_FUNC_ACL_ARG])
 182   if test "$enable_acl" != no; then
 183     AC_CACHE_CHECK([for getxattr with XATTR_NAME_POSIX_ACL macros],
 184       [gl_cv_getxattr_with_posix_acls],
 185       [gl_cv_getxattr_with_posix_acls=no
 186        AC_LINK_IFELSE(
 187          [AC_LANG_PROGRAM(
 188             [[#include <sys/types.h>
 189               #include <sys/xattr.h>
 190               #include <linux/xattr.h>
 191             ]],
 192             [[ssize_t a = getxattr (".", XATTR_NAME_POSIX_ACL_ACCESS, 0, 0);
 193               ssize_t b = getxattr (".", XATTR_NAME_POSIX_ACL_DEFAULT, 0, 0);
 194               return a < 0 || b < 0;
 195             ]])],
 196          [gl_cv_getxattr_with_posix_acls=yes])])
 197   fi
 198   if test "$gl_cv_getxattr_with_posix_acls" = yes; then
 199     LIB_HAS_ACL=
 200     AC_DEFINE([GETXATTR_WITH_POSIX_ACLS], 1,
 201       [Define to 1 if getxattr works with XATTR_NAME_POSIX_ACL_ACCESS
 202        and XATTR_NAME_POSIX_ACL_DEFAULT.])
 203   else
 204     dnl Set gl_need_lib_has_acl to a nonempty value, so that any
 205     dnl later gl_FUNC_ACL call will set LIB_HAS_ACL=$LIB_ACL.
 206     gl_need_lib_has_acl=1
 207     LIB_HAS_ACL=$LIB_ACL
 208   fi
 209   AC_SUBST([LIB_HAS_ACL])
 210 ])