1 /* 2 * Copyright (C) 2018 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 #pragma once 30 31 #include <limits.h> 32 #include <sys/cdefs.h> 33 #include <sys/types.h> 34 35 /* For 64-bit, the kernel's struct sigaction doesn't match the POSIX one, 36 * so we need to expose our own and translate behind the scenes. 37 * For 32-bit, we're stuck with the definitions we already shipped, 38 * even though they contain a sigset_t that's too small. See sigaction64. 39 */ 40 #define sigaction __kernel_sigaction 41 #include <linux/signal.h> 42 #undef sigaction 43 44 /* The arm and x86 kernel header files don't define _NSIG. */ 45 #ifndef _KERNEL__NSIG 46 #define _KERNEL__NSIG 64 47 #endif 48 49 /* Userspace's NSIG is the kernel's _NSIG + 1. */ 50 #define _NSIG (_KERNEL__NSIG + 1) 51 #define NSIG _NSIG 52 53 typedef int sig_atomic_t; 54 55 typedef __sighandler_t sig_t; /* BSD compatibility. */ 56 typedef __sighandler_t sighandler_t; /* glibc compatibility. */ 57 58 /* sigset_t is already large enough on LP64, but LP32's sigset_t 59 * is just `unsigned long`. 60 */ 61 #if defined(__LP64__) 62 typedef sigset_t sigset64_t; 63 #else 64 typedef struct { unsigned long __bits[_KERNEL__NSIG/LONG_BIT]; } sigset64_t; 65 #endif 66 67 #if defined(__LP64__) 68 69 #define __SIGACTION_BODY \ 70 int sa_flags; \ 71 union { \ 72 sighandler_t sa_handler; \ 73 void (*sa_sigaction)(int, struct siginfo*, void*); \ 74 }; \ 75 sigset_t sa_mask; \ 76 void (*sa_restorer)(void); \ 77 78 struct sigaction { __SIGACTION_BODY }; 79 struct sigaction64 { __SIGACTION_BODY }; 80 81 #undef __SIGACTION_BODY 82 83 #else 84 85 #undef sa_handler 86 #undef sa_sigaction 87 88 struct sigaction { 89 union { 90 sighandler_t sa_handler; 91 void (*sa_sigaction)(int, struct siginfo*, void*); 92 }; 93 sigset_t sa_mask; 94 int sa_flags; 95 void (*sa_restorer)(void); 96 }; 97 98 /* This matches the kernel's internal structure. */ 99 struct sigaction64 { 100 union { 101 sighandler_t sa_handler; 102 void (*sa_sigaction)(int, struct siginfo*, void*); 103 }; 104 int sa_flags; 105 void (*sa_restorer)(void); 106 sigset64_t sa_mask; 107 }; 108 109 #endif 110