blob: 52820f2809f9e1829b305495c87b9d6b01a0d2a9 [file] [log] [blame]
Greg Hackmann5375bf62016-02-29 12:35:33 -08001/*
2 * Copyright (C) 2016 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <signal.h>
30#include <string.h>
31
Elliott Hughes4b1c6e72018-01-24 18:54:38 -080032#include "private/kernel_sigset_t.h"
33
Greg Hackmann5375bf62016-02-29 12:35:33 -080034sighandler_t sigset(int sig, sighandler_t disp) {
35 struct sigaction new_sa;
36 if (disp != SIG_HOLD) {
37 memset(&new_sa, 0, sizeof(new_sa));
38 new_sa.sa_handler = disp;
39 sigemptyset(&new_sa.sa_mask);
40 }
41
42 struct sigaction old_sa;
Elliott Hughes4b1c6e72018-01-24 18:54:38 -080043 if (sigaction(sig, (disp == SIG_HOLD) ? nullptr : &new_sa, &old_sa) == -1) {
Greg Hackmann5375bf62016-02-29 12:35:33 -080044 return SIG_ERR;
45 }
46
Elliott Hughes4b1c6e72018-01-24 18:54:38 -080047 kernel_sigset_t new_mask{sig};
48 kernel_sigset_t old_mask;
49 if (__rt_sigprocmask(disp == SIG_HOLD ? SIG_BLOCK : SIG_UNBLOCK, &new_mask, &old_mask,
50 sizeof(new_mask)) == -1) {
Greg Hackmann5375bf62016-02-29 12:35:33 -080051 return SIG_ERR;
52 }
53
Elliott Hughes4b1c6e72018-01-24 18:54:38 -080054 return old_mask.is_set(sig) ? SIG_HOLD : old_sa.sa_handler;
Greg Hackmann5375bf62016-02-29 12:35:33 -080055}