| 1 | /* Support functionality for using signals. |
|---|
| 2 | Copyright (C) 2016-2022 Free Software Foundation, Inc. |
|---|
| 3 | This file is part of the GNU C Library. |
|---|
| 4 | |
|---|
| 5 | The GNU C Library is free software; you can redistribute it and/or |
|---|
| 6 | modify it under the terms of the GNU Lesser General Public |
|---|
| 7 | License as published by the Free Software Foundation; either |
|---|
| 8 | version 2.1 of the License, or (at your option) any later version. |
|---|
| 9 | |
|---|
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
|---|
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
|---|
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|---|
| 13 | Lesser General Public License for more details. |
|---|
| 14 | |
|---|
| 15 | You should have received a copy of the GNU Lesser General Public |
|---|
| 16 | License along with the GNU C Library; if not, see |
|---|
| 17 | <https://www.gnu.org/licenses/>. */ |
|---|
| 18 | |
|---|
| 19 | #ifndef SUPPORT_SIGNAL_H |
|---|
| 20 | #define SUPPORT_SIGNAL_H |
|---|
| 21 | |
|---|
| 22 | #include <signal.h> |
|---|
| 23 | #include <sys/cdefs.h> |
|---|
| 24 | |
|---|
| 25 | __BEGIN_DECLS |
|---|
| 26 | |
|---|
| 27 | /* The following functions call the corresponding libc functions and |
|---|
| 28 | terminate the process on error. */ |
|---|
| 29 | |
|---|
| 30 | void xraise (int sig); |
|---|
| 31 | #ifdef _GNU_SOURCE |
|---|
| 32 | sighandler_t xsignal (int sig, sighandler_t handler); |
|---|
| 33 | #endif |
|---|
| 34 | void xsigaction (int sig, const struct sigaction *newact, |
|---|
| 35 | struct sigaction *oldact); |
|---|
| 36 | |
|---|
| 37 | /* The following functions call the corresponding libpthread functions |
|---|
| 38 | and terminate the process on error. */ |
|---|
| 39 | |
|---|
| 40 | void xpthread_sigmask (int how, const sigset_t *set, sigset_t *oldset); |
|---|
| 41 | |
|---|
| 42 | /* Allocate and activate an alternate signal stack. This stack will |
|---|
| 43 | have SIZE + MINSIGSTKSZ bytes of space, rounded up to a whole |
|---|
| 44 | number of pages. There will be large (at least 1 MiB) inaccessible |
|---|
| 45 | guard bands on either side of it. The return value is a cookie |
|---|
| 46 | that can be passed to xfree_sigstack to deactivate and deallocate |
|---|
| 47 | the stack again. It is not necessary to call sigaltstack after |
|---|
| 48 | calling this function. Terminates the process on error. */ |
|---|
| 49 | void *xalloc_sigstack (size_t size); |
|---|
| 50 | |
|---|
| 51 | /* Deactivate and deallocate a signal stack created by xalloc_sigstack. */ |
|---|
| 52 | void xfree_sigstack (void *stack); |
|---|
| 53 | |
|---|
| 54 | /* Extract the actual address and size of the alternate signal stack from |
|---|
| 55 | the cookie returned by xalloc_sigstack. */ |
|---|
| 56 | void xget_sigstack_location (const void *stack, unsigned char **addrp, |
|---|
| 57 | size_t *sizep); |
|---|
| 58 | |
|---|
| 59 | __END_DECLS |
|---|
| 60 | |
|---|
| 61 | #endif /* SUPPORT_SIGNAL_H */ |
|---|
| 62 | |
|---|
