Use REPLACE_ISFINITE instead of HAVE_DECL_ISFINITE.

[gnulib.git] / lib / c-stack.c

diff --git a/lib/c-stack.c b/lib/c-stack.c
index e42d5f5..9bf19ff 100644 (file)
--- a/lib/c-stack.c
+++ b/lib/c-stack.c
@@ -1,11 +1,11 @@
 /* Stack overflow handling.
 
-   Copyright (C) 2002, 2004 Free Software Foundation, Inc.
+   Copyright (C) 2002, 2004, 2006 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
+   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
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -13,8 +13,7 @@
    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, write to the Free Software Foundation,
-   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 /* Written by Paul Eggert.  */
 
@@ -34,9 +33,7 @@
 
    No attempt has been made to deal with multithreaded applications.  */
 
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
 
 #ifndef __attribute__
 # if __GNUC__ < 3 || __STRICT_ANSI__
@@ -77,9 +74,7 @@ typedef struct sigaltstack stack_t;
 # include <ucontext.h>
 #endif
 
-#if HAVE_UNISTD_H
-# include <unistd.h>
-#endif
+#include <unistd.h>
 #ifndef STDERR_FILENO
 # define STDERR_FILENO 2
 #endif
@@ -91,6 +86,13 @@ typedef struct sigaltstack stack_t;
 #include "c-stack.h"
 #include "exitfail.h"
 
+#if (HAVE_STRUCT_SIGACTION_SA_SIGACTION && defined SA_NODEFER \
+     && defined SA_ONSTACK && defined SA_RESETHAND && defined SA_SIGINFO)
+# define SIGACTION_WORKS 1
+#else
+# define SIGACTION_WORKS 0
+#endif
+
 extern char *program_name;
 
 /* The user-specified action to take when a SEGV-related program error
@@ -153,7 +155,7 @@ static union
   void *p;
 } alternate_signal_stack;
 
-# if defined SA_ONSTACK && defined SA_SIGINFO && defined _SC_PAGESIZE
+# if SIGACTION_WORKS
 
 /* Handle a segmentation violation and exit.  This function is
    async-signal-safe.  */
@@ -238,9 +240,7 @@ c_stack_action (void (*action) (int))
   stack_overflow_message = _("stack overflow");
 
   {
-# if ! (defined SA_ONSTACK && defined SA_SIGINFO && defined _SC_PAGESIZE)
-    return signal (SIGSEGV, die) == SIG_ERR ? -1 : 0;
-# else
+# if SIGACTION_WORKS
     struct sigaction act;
     sigemptyset (&act.sa_mask);
 
@@ -252,6 +252,8 @@ c_stack_action (void (*action) (int))
     act.sa_sigaction = segv_handler;
 
     return sigaction (SIGSEGV, &act, 0);
+# else
+    return signal (SIGSEGV, die) == SIG_ERR ? -1 : 0;
 # endif
   }
 }
@@ -299,6 +301,6 @@ main (int argc __attribute__ ((unused)), char **argv)
 \f
 /*
 Local Variables:
-compile-command: "gcc -DDEBUG -DHAVE_CONFIG_H -I.. -g -O -Wall -W c-stack.c"
+compile-command: "gcc -DDEBUG -g -O -Wall -W c-stack.c"
 End:
 */