1 /*
2  * Copyright (C) 2013 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #ifndef LIBC_PRIVATE_KERNEL_SIGSET_T_H_
18 #define LIBC_PRIVATE_KERNEL_SIGSET_T_H_
19 
20 #include <signal.h>
21 
22 // Our sigset_t is wrong for ARM and x86. It's 32-bit but the kernel expects 64 bits.
23 // This means we can't support real-time signals correctly until we can change the ABI.
24 // In the meantime, we can use this union to pass an appropriately-sized block of memory
25 // to the kernel, at the cost of not being able to refer to real-time signals.
26 union kernel_sigset_t {
kernel_sigset_t()27   kernel_sigset_t() {
28     clear();
29   }
30 
kernel_sigset_t(const sigset_t * value)31   kernel_sigset_t(const sigset_t* value) {
32     clear();
33     set(value);
34   }
35 
clear()36   void clear() {
37     __builtin_memset(this, 0, sizeof(*this));
38   }
39 
set(const sigset_t * value)40   void set(const sigset_t* value) {
41     bionic = *value;
42   }
43 
get()44   sigset_t* get() {
45     return &bionic;
46   }
47 
48   sigset_t bionic;
49 #ifndef __mips__
50   uint32_t kernel[2];
51 #endif
52 };
53 
54 #endif
55