1 files changed, 39 insertions, 0 deletions
diff --git a/libsigsegv/src/leave-sigaltstack.c b/libsigsegv/src/leave-sigaltstack.c
new file mode 100644
index 00000000..39749a55
--- /dev/null
+++ b/libsigsegv/src/leave-sigaltstack.c
@@ -0,0 +1,39 @@
+/* Leaving a signal handler executing on the alternate stack.
+   Copyright (C) 2002-2003  Bruno Haible <bruno@clisp.org>
+
+   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.
+
+   This program 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, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#include <stddef.h>
+#include <signal.h>
+#if HAVE_SYS_SIGNAL_H
+# include <sys/signal.h>
+#endif
+
+/* For MacOSX.  */
+#ifndef SS_ONSTACK
+#define SS_ONSTACK SA_ONSTACK
+#endif
+
+void
+sigsegv_reset_onstack_flag (void)
+{
+  stack_t ss;
+
+  if (sigaltstack (NULL, &ss) >= 0)
+    {
+      ss.ss_flags &= ~SS_ONSTACK;
+      sigaltstack (&ss, NULL);
+    }
+}