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[Bug-gnulib] c-stack merge from coreutils
From: |
Paul Eggert |
Subject: |
[Bug-gnulib] c-stack merge from coreutils |
Date: |
16 Aug 2003 17:12:46 -0700 |
User-agent: |
Gnus/5.09 (Gnus v5.9.0) Emacs/21.3 |
I installed these changes from coreutils:
2003-08-16 Jim Meyering <address@hidden>
* c-stack.m4 (AC_SYS_XSI_STACK_OVERFLOW_HEURISTIC): Limit stack size
to 1MB, so as not to render systems with no stack size limit (e.g.,
linux-2.2.x) unusable. Suggestion and code from Bruno Haible.
Include <unistd.h>. On some systems,
it is required for the definition of _SC_PAGESIZE.
Index: m4/c-stack.m4
===================================================================
RCS file: /cvsroot/gnulib/gnulib/m4/c-stack.m4,v
retrieving revision 1.2
diff -p -u -r1.2 c-stack.m4
--- m4/c-stack.m4 31 Dec 2002 13:43:06 -0000 1.2
+++ m4/c-stack.m4 17 Aug 2003 00:07:57 -0000
@@ -1,6 +1,6 @@
# Check prerequisites for compiling lib/c-stack.c.
-# Copyright (C) 2002 Free Software Foundation, Inc.
+# Copyright (C) 2002, 2003 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
@@ -22,13 +22,20 @@
AC_DEFUN([AC_SYS_XSI_STACK_OVERFLOW_HEURISTIC],
[# for STACK_DIRECTION
AC_REQUIRE([AC_FUNC_ALLOCA])
+ AC_CHECK_FUNCS(setrlimit)
AC_CACHE_CHECK([for working C stack overflow detection],
ac_cv_sys_xsi_stack_overflow_heuristic,
[AC_TRY_RUN(
[
+ #include <unistd.h>
#include <signal.h>
#include <ucontext.h>
+ #if HAVE_SETRLIMIT
+ # include <sys/types.h>
+ # include <sys/time.h>
+ # include <sys/resource.h>
+ #endif
static union
{
@@ -101,6 +108,16 @@ AC_DEFUN([AC_SYS_XSI_STACK_OVERFLOW_HEUR
int
main (void)
{
+ #if 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
+
c_stack_action ();
return recurse ("\1");
}
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