| 1 | # serial 18 |
| 2 | |
| 3 | dnl From Jim Meyering. |
| 4 | dnl A wrapper around AC_FUNC_GETGROUPS. |
| 5 | |
| 6 | # Copyright (C) 1996-1997, 1999-2004, 2008-2013 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 | |
| 12 | m4_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 |
| 16 | AC_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 | |
| 64 | AC_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 | ]) |