1 /* 2 * Copyright (C) 2016 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 /** 32 * @file bits/ioctl.h 33 * @brief The ioctl() function. 34 */ 35 36 #include <sys/cdefs.h> 37 38 __BEGIN_DECLS 39 40 /** 41 * [ioctl(2)](http://man7.org/linux/man-pages/man2/ioctl.2.html) operates on device files. 42 */ 43 int ioctl(int __fd, int __request, ...); 44 45 /* 46 * Work around unsigned -> signed conversion warnings: many common ioctl 47 * constants are unsigned. 48 * 49 * Since this workaround introduces an overload to ioctl, it's possible that it 50 * will break existing code that takes the address of ioctl. If such a breakage 51 * occurs, you can work around it by either: 52 * - specifying a concrete, correct type for ioctl (whether it be through a cast 53 * in `(int (*)(int, int, ...))ioctl`, creating a temporary variable with the 54 * type of the ioctl you prefer, ...), or 55 * - defining BIONIC_IOCTL_NO_SIGNEDNESS_OVERLOAD, which will make the 56 * overloading go away. 57 */ 58 #if !defined(BIONIC_IOCTL_NO_SIGNEDNESS_OVERLOAD) 59 /* enable_if(1) just exists to break overloading ties. */ 60 int ioctl(int __fd, unsigned __request, ...) __overloadable __enable_if(1, "") __RENAME(ioctl); 61 #endif 62 63 __END_DECLS 64
