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Diffstat (limited to '')
| -rw-r--r-- | m4/getgroups.m4 | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/m4/getgroups.m4 b/m4/getgroups.m4 new file mode 100644 index 0000000..d7a71f5 --- /dev/null +++ b/m4/getgroups.m4 @@ -0,0 +1,110 @@ +# serial 24 + +dnl From Jim Meyering. +dnl A wrapper around AC_FUNC_GETGROUPS. + +# Copyright (C) 1996-1997, 1999-2004, 2008-2022 Free Software Foundation, Inc. +# +# This file is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This is taken from the following Autoconf patch: +# https://git.savannah.gnu.org/gitweb/?p=autoconf.git;a=commitdiff;h=7fbb553727ed7e0e689a17594b58559ecf3ea6e9 +AC_DEFUN([AC_FUNC_GETGROUPS], +[ + AC_REQUIRE([AC_TYPE_GETGROUPS])dnl + AC_REQUIRE([AC_TYPE_SIZE_T])dnl + AC_REQUIRE([AC_CANONICAL_HOST])dnl for cross-compiles + AC_CHECK_FUNC([getgroups]) + + # If we don't yet have getgroups, see if it's in -lbsd. + # This is reported to be necessary on an ITOS 3000WS running SEIUX 3.1. + ac_save_LIBS=$LIBS + if test $ac_cv_func_getgroups = no; then + AC_CHECK_LIB(bsd, getgroups, [GETGROUPS_LIB=-lbsd]) + fi + + # Run the program to test the functionality of the system-supplied + # getgroups function only if there is such a function. + if test $ac_cv_func_getgroups = yes; then + AC_CACHE_CHECK([for working getgroups], [ac_cv_func_getgroups_works], + [AC_RUN_IFELSE( + [AC_LANG_PROGRAM( + [AC_INCLUDES_DEFAULT], + [[/* On NeXTstep 3.2, getgroups (0, 0) always fails. */ + return getgroups (0, 0) == -1;]]) + ], + [ac_cv_func_getgroups_works=yes], + [ac_cv_func_getgroups_works=no], + [case "$host_os" in # (( + # Guess yes on glibc systems. + *-gnu* | gnu*) ac_cv_func_getgroups_works="guessing yes" ;; + # Guess yes on musl systems. + *-musl*) ac_cv_func_getgroups_works="guessing yes" ;; + # If we don't know, obey --enable-cross-guesses. + *) ac_cv_func_getgroups_works="$gl_cross_guess_normal" ;; + esac + ]) + ]) + else + ac_cv_func_getgroups_works=no + fi + case "$ac_cv_func_getgroups_works" in + *yes) + AC_DEFINE([HAVE_GETGROUPS], [1], + [Define to 1 if your system has a working `getgroups' function.]) + ;; + esac + LIBS=$ac_save_LIBS +])# AC_FUNC_GETGROUPS + +AC_DEFUN([gl_FUNC_GETGROUPS], +[ + AC_REQUIRE([AC_TYPE_GETGROUPS]) + AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + + AC_FUNC_GETGROUPS + if test $ac_cv_func_getgroups != yes; then + HAVE_GETGROUPS=0 + else + if test "$ac_cv_type_getgroups" != gid_t \ + || { case "$ac_cv_func_getgroups_works" in + *yes) false;; + *) true;; + esac + }; then + REPLACE_GETGROUPS=1 + AC_DEFINE([GETGROUPS_ZERO_BUG], [1], [Define this to 1 if + getgroups(0,NULL) does not return the number of groups.]) + else + dnl Detect Mac OS X and FreeBSD bug; POSIX requires getgroups(-1,ptr) + dnl to fail. + AC_CACHE_CHECK([whether getgroups handles negative values], + [gl_cv_func_getgroups_works], + [AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT], + [[int size = getgroups (0, 0); + gid_t *list = malloc (size * sizeof *list); + int result = getgroups (-1, list) != -1; + free (list); + return result;]])], + [gl_cv_func_getgroups_works=yes], + [gl_cv_func_getgroups_works=no], + [case "$host_os" in + # Guess yes on glibc systems. + *-gnu* | gnu*) gl_cv_func_getgroups_works="guessing yes" ;; + # Guess yes on musl systems. + *-musl*) gl_cv_func_getgroups_works="guessing yes" ;; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_getgroups_works="$gl_cross_guess_normal" ;; + esac + ])]) + case "$gl_cv_func_getgroups_works" in + *yes) ;; + *) REPLACE_GETGROUPS=1 ;; + esac + fi + fi + test -n "$GETGROUPS_LIB" && LIBS="$GETGROUPS_LIB $LIBS" +]) |