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Diffstat (limited to 'build-aux/m4/stackovf.m4')
| -rw-r--r-- | build-aux/m4/stackovf.m4 | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/build-aux/m4/stackovf.m4 b/build-aux/m4/stackovf.m4 new file mode 100644 index 00000000..d1812230 --- /dev/null +++ b/build-aux/m4/stackovf.m4 @@ -0,0 +1,91 @@ +# -*- Autoconf -*- +# stackovf.m4 -- how do we deal with stack overflow? +# +# Copyright (C) 2000, 2003, 2006-2007, 2010, 2013 Free Software +# Foundation, Inc. +# +# This file is part of GNU M4. +# +# GNU M4 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 3 of the License, or +# (at your option) any later version. +# +# GNU M4 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, see <http://www.gnu.org/licenses/>. + +# serial 7 + +# M4_SYS_STACKOVF +# --------------- +AC_DEFUN([M4_SYS_STACKOVF], +[AC_PREREQ([2.60])dnl We use the _ONCE variants +AC_REQUIRE([AC_TYPE_SIGNAL])dnl + +AC_CHECK_HEADERS_ONCE([siginfo.h]) +AC_CHECK_FUNCS_ONCE([sigaction sigaltstack sigstack sigvec]) +AC_CHECK_MEMBERS([stack_t.ss_sp], [], [], +[[#include <signal.h> +#if HAVE_SIGINFO_H +# include <siginfo.h> +#endif +]]) + +# Code from Jim Avera <jima@netcom.com>. +# stackovf.c requires: +# 1. Either sigaction with SA_ONSTACK, or sigvec with SV_ONSTACK +# 2. Either sigaltstack or sigstack +# 3. getrlimit, including support for RLIMIT_STACK +AC_CACHE_CHECK([if stack overflow is detectable], [M4_cv_use_stackovf], +[M4_cv_use_stackovf=no +if test "$ac_cv_func_sigaction" = yes || test "$ac_cv_func_sigvec" = yes; then + if test "$ac_cv_func_sigaltstack" = yes || test "$ac_cv_func_sigstack" = yes; then + AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <sys/time.h> +#include <sys/resource.h> +#include <signal.h> +]], [[struct rlimit r; getrlimit (RLIMIT_STACK, &r); +#if (!defined HAVE_SIGACTION || !defined SA_ONSTACK) \ + && (!defined HAVE_SIGVEC || !defined SV_ONSTACK) +choke me /* SA_ONSTACK and/or SV_ONSTACK are not defined */ +#endif +]])], [M4_cv_use_stackovf=yes]) + fi +fi]) + +AM_CONDITIONAL([STACKOVF], [test "$M4_cv_use_stackovf" = yes]) +if test "$M4_cv_use_stackovf" = yes; then + AC_DEFINE([USE_STACKOVF], [1], + [Define to 1 if using stack overflow detection.]) + AC_CHECK_TYPES([rlim_t], [], + [AC_DEFINE([rlim_t], [int], + [Define to int if rlim_t is not defined in sys/resource.h])], + [[#include <sys/resource.h> +]]) + AC_CHECK_TYPES([stack_t], [], + [AC_DEFINE([stack_t], [struct sigaltstack], + [Define to struct sigaltstack if stack_t is not in signal.h])], + [[#include <signal.h> +]]) + AC_CHECK_TYPES([sigcontext], [], [], [[#include <signal.h> +]]) + AC_CHECK_TYPES([siginfo_t], [], [], [[#include <signal.h> +#if HAVE_SIGINFO_H +# include <siginfo.h> +#endif +]]) + AC_CHECK_MEMBERS([struct sigaction.sa_sigaction], [], [], +[[#include <signal.h> +]]) + + AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <signal.h> +]], + [[struct sigaltstack x; x.ss_base = 0;]])], + [AC_DEFINE([ss_sp], [ss_base], + [Define to ss_base if stack_t has ss_base instead of ss_sp.])]) +fi +])# M4_SYS_STACKOVF |