1# serial 18
2
3dnl From Jim Meyering.
4dnl A wrapper around AC_FUNC_GETGROUPS.
5
6# Copyright (C) 1996-1997, 1999-2004, 2008-2014 Free Software Foundation, Inc.
7#
8# This file is free software; the Free Software Foundation
9# gives unlimited permission to copy and/or distribute it,
10# with or without modifications, as long as this notice is preserved.
11
12m4_version_prereq([2.70], [] ,[
13
14# This is taken from the following Autoconf patch:
15# http://git.savannah.gnu.org/gitweb/?p=autoconf.git;a=commitdiff;h=7fbb553727ed7e0e689a17594b58559ecf3ea6e9
16AC_DEFUN([AC_FUNC_GETGROUPS],
17[
18  AC_REQUIRE([AC_TYPE_GETGROUPS])dnl
19  AC_REQUIRE([AC_TYPE_SIZE_T])dnl
20  AC_REQUIRE([AC_CANONICAL_HOST])dnl for cross-compiles
21  AC_CHECK_FUNC([getgroups])
22
23  # If we don't yet have getgroups, see if it's in -lbsd.
24  # This is reported to be necessary on an ITOS 3000WS running SEIUX 3.1.
25  ac_save_LIBS=$LIBS
26  if test $ac_cv_func_getgroups = no; then
27    AC_CHECK_LIB(bsd, getgroups, [GETGROUPS_LIB=-lbsd])
28  fi
29
30  # Run the program to test the functionality of the system-supplied
31  # getgroups function only if there is such a function.
32  if test $ac_cv_func_getgroups = yes; then
33    AC_CACHE_CHECK([for working getgroups], [ac_cv_func_getgroups_works],
34      [AC_RUN_IFELSE(
35         [AC_LANG_PROGRAM(
36            [AC_INCLUDES_DEFAULT],
37            [[/* On Ultrix 4.3, getgroups (0, 0) always fails.  */
38              return getgroups (0, 0) == -1;]])
39         ],
40         [ac_cv_func_getgroups_works=yes],
41         [ac_cv_func_getgroups_works=no],
42         [case "$host_os" in # ((
43                    # Guess yes on glibc systems.
44            *-gnu*) ac_cv_func_getgroups_works="guessing yes" ;;
45                    # If we don't know, assume the worst.
46            *)      ac_cv_func_getgroups_works="guessing no" ;;
47          esac
48         ])
49      ])
50  else
51    ac_cv_func_getgroups_works=no
52  fi
53  case "$ac_cv_func_getgroups_works" in
54    *yes)
55      AC_DEFINE([HAVE_GETGROUPS], [1],
56        [Define to 1 if your system has a working `getgroups' function.])
57      ;;
58  esac
59  LIBS=$ac_save_LIBS
60])# AC_FUNC_GETGROUPS
61
62])
63
64AC_DEFUN([gl_FUNC_GETGROUPS],
65[
66  AC_REQUIRE([AC_TYPE_GETGROUPS])
67  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
68  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
69
70  AC_FUNC_GETGROUPS
71  if test $ac_cv_func_getgroups != yes; then
72    HAVE_GETGROUPS=0
73  else
74    if test "$ac_cv_type_getgroups" != gid_t \
75       || { case "$ac_cv_func_getgroups_works" in
76              *yes) false;;
77              *) true;;
78            esac
79          }; then
80      REPLACE_GETGROUPS=1
81      AC_DEFINE([GETGROUPS_ZERO_BUG], [1], [Define this to 1 if
82        getgroups(0,NULL) does not return the number of groups.])
83    else
84      dnl Detect FreeBSD bug; POSIX requires getgroups(-1,ptr) to fail.
85      AC_CACHE_CHECK([whether getgroups handles negative values],
86        [gl_cv_func_getgroups_works],
87        [AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
88          [[int size = getgroups (0, 0);
89            gid_t *list = malloc (size * sizeof *list);
90            return getgroups (-1, list) != -1;]])],
91          [gl_cv_func_getgroups_works=yes],
92          [gl_cv_func_getgroups_works=no],
93          [case "$host_os" in
94                     # Guess yes on glibc systems.
95             *-gnu*) gl_cv_func_getgroups_works="guessing yes" ;;
96                     # If we don't know, assume the worst.
97             *)      gl_cv_func_getgroups_works="guessing no" ;;
98           esac
99          ])])
100      case "$gl_cv_func_getgroups_works" in
101        *yes) ;;
102        *) REPLACE_GETGROUPS=1 ;;
103      esac
104    fi
105  fi
106  test -n "$GETGROUPS_LIB" && LIBS="$GETGROUPS_LIB $LIBS"
107])
108