/* * Copyright (C) 2018 The Android Open Source Project * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #pragma once #include #include #include #include __BEGIN_DECLS /** * The highest kernel-supported signal number, plus one. * * In theory this is useful for declaring an array with an entry for each signal. * In practice, that's less useful than it seems because of the real-time * signals and the reserved signals, * and the sig2str() and str2sig() functions cover the most common use case * of translating between signal numbers and signal names. * * Note also that although sigset_t and sigset64_t are the same type on LP64, * on ILP32 only sigset64_t is large enough to refer to the upper 32 signals. * NSIG does _not_ tell you anything about what can be used with sigset_t. * * See the * (32-bit ABI bugs)[https://android.googlesource.com/platform/bionic/+/main/docs/32-bit-abi.md#is-too-small-for-real_time-signals] * documentation. */ #define NSIG 65 /** A traditional alternative name for NSIG. */ #define _NSIG 65 /* * We rewrite the kernel's _NSIG to _KERNEL__NSIG * (because the kernel values are off by one from the userspace values), * but the kernel headers define SIGRTMAX in terms of * _KERNEL__NSIG (or _NSIG, in the original kernel source), * so we need to provide a definition here. * (Ideally our uapi header rewriter would just hard-code _KERNEL__NSIG to 64.) */ #ifndef _KERNEL__NSIG #define _KERNEL__NSIG 64 #endif typedef int sig_atomic_t; typedef __sighandler_t sig_t; /* BSD compatibility. */ typedef __sighandler_t sighandler_t; /* glibc compatibility. */ #if defined(__LP64__) /** * The kernel LP64 sigset_t is large enough to support all signals; * this typedef is just for source compatibility with code that uses * real-time signals on ILP32. * * See the * (32-bit ABI bugs)[https://android.googlesource.com/platform/bionic/+/main/docs/32-bit-abi.md#is-too-small-for-real_time-signals] * documentation. */ typedef sigset_t sigset64_t; #else /** * The ILP32 sigset_t is only 32 bits, so we need a 64-bit sigset64_t * and associated functions to be able to support the real-time signals. * * See the * (32-bit ABI bugs)[https://android.googlesource.com/platform/bionic/+/main/docs/32-bit-abi.md#is-too-small-for-real_time-signals] * documentation. */ typedef struct { unsigned long __bits[64/(8*sizeof(long))]; } sigset64_t; #endif /* The kernel's struct sigaction doesn't match the POSIX one, * so we define struct sigaction ourselves. */ #if defined(__LP64__) #define __SIGACTION_BODY \ int sa_flags; \ union { \ sighandler_t sa_handler; \ void (*sa_sigaction)(int, struct siginfo*, void*); \ }; \ sigset_t sa_mask; \ void (*sa_restorer)(void); \ /** * Used with sigaction(). * * On LP64, this supports all signals including real-time signals. * On ILP32, this only supports the first 32 signals. * * See the * (32-bit ABI bugs)[https://android.googlesource.com/platform/bionic/+/main/docs/32-bit-abi.md#is-too-small-for-real_time-signals] * documentation. */ struct sigaction { __SIGACTION_BODY }; /** * Used with sigaction64(). * * On LP64, a synonym for struct sigaction for source compatibility with ILP32. * On ILP32, this is needed to support all signals including real-time signals * because struct sigaction only supports the first 32 signals. * * See the * (32-bit ABI bugs)[https://android.googlesource.com/platform/bionic/+/main/docs/32-bit-abi.md#is-too-small-for-real_time-signals] * documentation. */ struct sigaction64 { __SIGACTION_BODY }; #undef __SIGACTION_BODY #else /* The arm32 kernel headers pollute the namespace with these, * but our header scrubber doesn't know how to remove #defines. */ #undef sa_handler #undef sa_sigaction /** * Used with sigaction(). * * On LP64, this supports all signals including real-time signals. * On ILP32, this only supports the first 32 signals. * * See the * (32-bit ABI bugs)[https://android.googlesource.com/platform/bionic/+/main/docs/32-bit-abi.md#is-too-small-for-real_time-signals] * documentation. */ struct sigaction { union { sighandler_t sa_handler; void (*sa_sigaction)(int, struct siginfo*, void*); }; sigset_t sa_mask; int sa_flags; void (*sa_restorer)(void); }; /** * Used with sigaction64(). * * On LP64, a synonym for struct sigaction for source compatibility with ILP32. * On ILP32, this is needed to support all signals including real-time signals * because struct sigaction only supports the first 32 signals. * * See the * (32-bit ABI bugs)[https://android.googlesource.com/platform/bionic/+/main/docs/32-bit-abi.md#is-too-small-for-real_time-signals] * documentation. */ struct sigaction64 { union { sighandler_t sa_handler; void (*sa_sigaction)(int, struct siginfo*, void*); }; int sa_flags; void (*sa_restorer)(void); sigset64_t sa_mask; }; #endif __END_DECLS