diff options
Diffstat (limited to 'libsigsegv/m4/sigaltstack.m4')
| -rw-r--r-- | libsigsegv/m4/sigaltstack.m4 | 198 |
1 files changed, 0 insertions, 198 deletions
diff --git a/libsigsegv/m4/sigaltstack.m4 b/libsigsegv/m4/sigaltstack.m4 deleted file mode 100644 index 4f7d5d67..00000000 --- a/libsigsegv/m4/sigaltstack.m4 +++ /dev/null @@ -1,198 +0,0 @@ -# sigaltstack.m4 serial 10 (libsigsegv-2.7) -dnl Copyright (C) 2002-2006, 2008 Bruno Haible <bruno@clisp.org> -dnl Copyright (C) 2008 Eric Blake <ebb9@byu.net> -dnl This file is free software, distributed under the terms of the GNU -dnl General Public License. As a special exception to the GNU General -dnl Public License, this file may be distributed as part of a program -dnl that contains a configuration script generated by Autoconf, under -dnl the same distribution terms as the rest of that program. - -AC_DEFUN([SV_SIGALTSTACK], -[ - AC_REQUIRE([AC_PROG_CC]) - AC_REQUIRE([AC_CANONICAL_HOST]) - - AC_CHECK_FUNCS(sigaltstack) - - if test "$ac_cv_func_sigaltstack" = yes; then - AC_CHECK_TYPE(stack_t, , - [AC_DEFINE(stack_t, [struct sigaltstack], - [Define to 'struct sigaltstack' if that's the type of the argument to sigaltstack]) - ], - [ -#include <signal.h> -#if HAVE_SYS_SIGNAL_H -# include <sys/signal.h> -#endif - ]) - fi - - AC_CACHE_CHECK([for working sigaltstack], sv_cv_sigaltstack, [ - if test "$ac_cv_func_sigaltstack" = yes; then - case "$host_os" in - macos* | darwin[[6-9]]* | darwin[[1-9]][[0-9]]*) - # On MacOS X 10.2 or newer, just assume that if it compiles, it will - # work. If we were to perform the real test, 1 Crash Report dialog - # window would pop up. - AC_LINK_IFELSE([ - AC_LANG_PROGRAM([[#include <signal.h>]], - [[int x = SA_ONSTACK; stack_t ss; sigaltstack ((stack_t*)0, &ss);]])], - [sv_cv_sigaltstack="guessing yes"], - [sv_cv_sigaltstack=no]) - ;; - *) - AC_RUN_IFELSE([ - AC_LANG_SOURCE([[ -#include <stdlib.h> -#include <signal.h> -#if HAVE_SYS_SIGNAL_H -# include <sys/signal.h> -#endif -#if HAVE_SETRLIMIT -# include <sys/types.h> -# include <sys/time.h> -# include <sys/resource.h> -#endif -#ifndef SIGSTKSZ -# define SIGSTKSZ 16384 -#endif -void stackoverflow_handler (int sig) -{ - /* If we get here, the stack overflow was caught. */ - exit (0); -} -volatile int * recurse_1 (volatile int n, volatile int *p) -{ - if (n >= 0) - *recurse_1 (n + 1, p) += n; - return p; -} -int recurse (volatile int n) -{ - int sum = 0; - return *recurse_1 (n, &sum); -} -int main () -{ - char mystack[2 * SIGSTKSZ]; - stack_t altstack; - struct sigaction action; -#if defined HAVE_SETRLIMIT && defined RLIMIT_STACK - /* Before starting the endless recursion, try to be friendly to the user's - machine. On some Linux 2.2.x systems, there is no stack limit for user - processes at all. We don't want to kill such systems. */ - struct rlimit rl; - rl.rlim_cur = rl.rlim_max = 0x100000; /* 1 MB */ - setrlimit (RLIMIT_STACK, &rl); -#endif - /* Install the alternate stack. Use the midpoint of mystack, to guard - against a buggy interpretation of ss_sp on IRIX. */ - altstack.ss_sp = mystack + SIGSTKSZ; - altstack.ss_size = SIGSTKSZ; - altstack.ss_flags = 0; /* no SS_DISABLE */ - if (sigaltstack (&altstack, NULL) < 0) - exit (1); - /* Install the SIGSEGV handler. */ - sigemptyset (&action.sa_mask); - action.sa_handler = &stackoverflow_handler; - action.sa_flags = SA_ONSTACK; - sigaction (SIGSEGV, &action, (struct sigaction *) NULL); - sigaction (SIGBUS, &action, (struct sigaction *) NULL); - /* Provoke a stack overflow. */ - recurse (0); - exit (2); -}]])], - [sv_cv_sigaltstack=yes], - [sv_cv_sigaltstack=no], - [ - dnl FIXME: Put in some more known values here. - case "$host_os" in - *) - AC_LINK_IFELSE([ - AC_LANG_PROGRAM([[#include <signal.h>]], - [[int x = SA_ONSTACK; stack_t ss; sigaltstack ((stack_t*)0, &ss);]])], - [sv_cv_sigaltstack="guessing yes"], - [sv_cv_sigaltstack=no]) - ;; - esac - ]) - ;; - esac - else - sv_cv_sigaltstack=no - fi - ]) - if test "$sv_cv_sigaltstack" != no; then - AC_DEFINE(HAVE_WORKING_SIGALTSTACK, 1, - [Define if you have the sigaltstack() function and it works.]) - - dnl The ss_sp field of a stack_t is, according to POSIX, the lowest address - dnl of the memory block designated as an alternate stack. But IRIX 5.3 - dnl interprets it as the highest address! - AC_CACHE_CHECK([for correct stack_t interpretation], - [sv_cv_sigaltstack_low_base], [ - AC_RUN_IFELSE([ - AC_LANG_SOURCE([[ -#include <stdlib.h> -#include <signal.h> -#if HAVE_SYS_SIGNAL_H -# include <sys/signal.h> -#endif -#ifndef SIGSTKSZ -# define SIGSTKSZ 16384 -#endif -volatile char *stack_lower_bound; -volatile char *stack_upper_bound; -static void check_stack_location (volatile char *addr) -{ - if (addr >= stack_lower_bound && addr <= stack_upper_bound) - exit (0); - else - exit (1); -} -static void stackoverflow_handler (int sig) -{ - char dummy; - check_stack_location (&dummy); -} -int main () -{ - char mystack[2 * SIGSTKSZ]; - stack_t altstack; - struct sigaction action; - /* Install the alternate stack. */ - altstack.ss_sp = mystack + SIGSTKSZ; - altstack.ss_size = SIGSTKSZ; - stack_lower_bound = (char *) altstack.ss_sp; - stack_upper_bound = (char *) altstack.ss_sp + altstack.ss_size - 1; - altstack.ss_flags = 0; /* no SS_DISABLE */ - if (sigaltstack (&altstack, NULL) < 0) - exit (2); - /* Install the SIGSEGV handler. */ - sigemptyset (&action.sa_mask); - action.sa_handler = &stackoverflow_handler; - action.sa_flags = SA_ONSTACK; - if (sigaction (SIGSEGV, &action, (struct sigaction *) NULL) < 0) - exit(3); - /* Provoke a SIGSEGV. */ - raise (SIGSEGV); - exit (3); -}]])], - [sv_cv_sigaltstack_low_base=yes], - [sv_cv_sigaltstack_low_base=no], - [ - dnl FIXME: Put in some more known values here. - case "$host_os" in - irix5*) sv_cv_sigaltstack_low_base="no" ;; - *) sv_cv_sigaltstack_low_base="guessing yes" ;; - esac - ]) - ]) - if test "$sv_cv_sigaltstack_low_base" = no; then - AC_DEFINE([SIGALTSTACK_SS_REVERSED], [1], - [Define if sigaltstack() interprets the stack_t.ss_sp field incorrectly, - as the highest address of the alternate stack range rather than as the - lowest address.]) - fi - fi -]) |