/* Support functionality for using signals.
- Copyright (C) 2016-2017 Free Software Foundation, Inc.
+ Copyright (C) 2016-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
+ <https://www.gnu.org/licenses/>. */
#ifndef SUPPORT_SIGNAL_H
#define SUPPORT_SIGNAL_H
void xpthread_sigmask (int how, const sigset_t *set, sigset_t *oldset);
+/* Allocate and activate an alternate signal stack. This stack will
+ have SIZE + MINSIGSTKSZ bytes of space, rounded up to a whole
+ number of pages. There will be large (at least 1 MiB) inaccessible
+ guard bands on either side of it. The return value is a cookie
+ that can be passed to xfree_sigstack to deactivate and deallocate
+ the stack again. It is not necessary to call sigaltstack after
+ calling this function. Terminates the process on error. */
+void *xalloc_sigstack (size_t size);
+
+/* Deactivate and deallocate a signal stack created by xalloc_sigstack. */
+void xfree_sigstack (void *stack);
+
+/* Extract the actual address and size of the alternate signal stack from
+ the cookie returned by xalloc_sigstack. */
+void xget_sigstack_location (const void *stack, unsigned char **addrp,
+ size_t *sizep);
+
__END_DECLS
#endif /* SUPPORT_SIGNAL_H */