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/* Support functionality for using signals.
Copyright (C) 2016-2021 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
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef SUPPORT_SIGNAL_H
#define SUPPORT_SIGNAL_H
#include <signal.h>
#include <sys/cdefs.h>
__BEGIN_DECLS
/* The following functions call the corresponding libc functions and
terminate the process on error. */
void xraise (int sig);
sighandler_t xsignal (int sig, sighandler_t handler);
void xsigaction (int sig, const struct sigaction *newact,
struct sigaction *oldact);
/* The following functions call the corresponding libpthread functions
and terminate the process on error. */
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 */
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