| Rom Lemarchand | a4b2dc0 | 2013-01-09 15:46:06 -0800 | [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 <sys/signalfd.h> |
| 30 | |
| 31 | /* Despite the fact that our kernel headers define sigset_t explicitly |
| 32 | * as a 32-bit integer, the kernel system call really expects a 64-bit |
| 33 | * bitmap for the signal set, or more exactly an array of two-32-bit |
| 34 | * values (see $KERNEL/arch/$ARCH/include/asm/signal.h for details). |
| 35 | * |
| 36 | * Unfortunately, we cannot fix the sigset_t definition without breaking |
| 37 | * the C library ABI, so perform a little runtime translation here. |
| 38 | */ |
| 39 | typedef union { |
| 40 | sigset_t bionic; |
| 41 | uint32_t kernel[2]; |
| 42 | } kernel_sigset_t; |
| 43 | |
| 44 | extern "C" int signalfd4(int fd, kernel_sigset_t *mask, size_t sizemask, int flags); |
| 45 | |
| 46 | int signalfd(int fd, const sigset_t *mask, int flags) |
| 47 | { |
| 48 | kernel_sigset_t in_set; |
| 49 | in_set.kernel[0] = in_set.kernel[1] = 0; |
| 50 | |
| 51 | in_set.bionic = *mask; |
| 52 | |
| 53 | return signalfd4(fd, &in_set, sizeof(in_set), flags); |
| 54 | } |