| Elliott Hughes | c7e9b23 | 2013-10-16 22:27:54 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 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 | |
| 31 | #if __LP64__ |
| 32 | extern "C" void __rt_sigreturn(void); |
| 33 | extern "C" int __rt_sigaction(int, const struct __kernel_sigaction*, struct __kernel_sigaction*, size_t); |
| 34 | #else |
| 35 | extern "C" int __sigaction(int, const struct sigaction*, struct sigaction*); |
| 36 | #endif |
| 37 | |
| 38 | int sigaction(int signal, const struct sigaction* bionic_new_action, struct sigaction* bionic_old_action) { |
| 39 | #if __LP64__ |
| 40 | __kernel_sigaction kernel_new_action; |
| 41 | if (bionic_new_action != NULL) { |
| 42 | kernel_new_action.sa_flags = bionic_new_action->sa_flags; |
| 43 | kernel_new_action.sa_handler = bionic_new_action->sa_handler; |
| 44 | kernel_new_action.sa_mask = bionic_new_action->sa_mask; |
| 45 | kernel_new_action.sa_restorer = bionic_new_action->sa_restorer; |
| 46 | |
| 47 | if (!(kernel_new_action.sa_flags & SA_RESTORER)) { |
| 48 | kernel_new_action.sa_flags |= SA_RESTORER; |
| 49 | kernel_new_action.sa_restorer = &__rt_sigreturn; |
| 50 | } |
| 51 | } |
| 52 | |
| 53 | __kernel_sigaction kernel_old_action; |
| 54 | int result = __rt_sigaction(signal, |
| 55 | (bionic_new_action != NULL) ? &kernel_new_action : NULL, |
| 56 | (bionic_old_action != NULL) ? &kernel_old_action : NULL, |
| 57 | sizeof(sigset_t)); |
| 58 | |
| 59 | if (bionic_old_action != NULL) { |
| 60 | bionic_old_action->sa_flags = kernel_old_action.sa_flags; |
| 61 | bionic_old_action->sa_handler = kernel_old_action.sa_handler; |
| 62 | bionic_old_action->sa_mask = kernel_old_action.sa_mask; |
| 63 | bionic_old_action->sa_restorer = kernel_old_action.sa_restorer; |
| 64 | |
| 65 | if (bionic_old_action->sa_restorer == &__rt_sigreturn) { |
| 66 | bionic_old_action->sa_flags &= ~SA_RESTORER; |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | return result; |
| 71 | #else |
| 72 | // The 32-bit ABI is broken. struct sigaction includes a too-small sigset_t. |
| 73 | // TODO: if we also had correct struct sigaction definitions available, we could copy in and out. |
| 74 | return __sigaction(signal, bionic_new_action, bionic_old_action); |
| 75 | #endif |
| 76 | } |