77 lines
3.2 KiB
C++
77 lines
3.2 KiB
C++
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/*
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* Copyright (C) 2013 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <signal.h>
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#if __LP64__
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extern "C" void __rt_sigreturn(void);
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extern "C" int __rt_sigaction(int, const struct __kernel_sigaction*, struct __kernel_sigaction*, size_t);
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#else
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extern "C" int __sigaction(int, const struct sigaction*, struct sigaction*);
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#endif
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int sigaction(int signal, const struct sigaction* bionic_new_action, struct sigaction* bionic_old_action) {
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#if __LP64__
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__kernel_sigaction kernel_new_action;
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if (bionic_new_action != NULL) {
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kernel_new_action.sa_flags = bionic_new_action->sa_flags;
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kernel_new_action.sa_handler = bionic_new_action->sa_handler;
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kernel_new_action.sa_mask = bionic_new_action->sa_mask;
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kernel_new_action.sa_restorer = bionic_new_action->sa_restorer;
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if (!(kernel_new_action.sa_flags & SA_RESTORER)) {
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kernel_new_action.sa_flags |= SA_RESTORER;
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kernel_new_action.sa_restorer = &__rt_sigreturn;
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}
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}
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__kernel_sigaction kernel_old_action;
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int result = __rt_sigaction(signal,
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(bionic_new_action != NULL) ? &kernel_new_action : NULL,
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(bionic_old_action != NULL) ? &kernel_old_action : NULL,
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sizeof(sigset_t));
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if (bionic_old_action != NULL) {
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bionic_old_action->sa_flags = kernel_old_action.sa_flags;
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bionic_old_action->sa_handler = kernel_old_action.sa_handler;
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bionic_old_action->sa_mask = kernel_old_action.sa_mask;
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bionic_old_action->sa_restorer = kernel_old_action.sa_restorer;
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if (bionic_old_action->sa_restorer == &__rt_sigreturn) {
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bionic_old_action->sa_flags &= ~SA_RESTORER;
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}
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}
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return result;
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#else
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// The 32-bit ABI is broken. struct sigaction includes a too-small sigset_t.
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// TODO: if we also had correct struct sigaction definitions available, we could copy in and out.
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return __sigaction(signal, bionic_new_action, bionic_old_action);
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#endif
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}
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