1 /* 2 * Copyright (c) 2000-2024 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 29 #ifndef _NET_SYSCTL_H_ 30 #define _NET_SYSCTL_H_ 31 32 #include <sys/cdefs.h> 33 #include <sys/sysctl.h> 34 /* 35 * Helper utilities for the sysctl procedures used 36 * by bsd networking. 37 */ 38 39 /* 40 * DECLARE_SYSCTL_HANDLER_ARG_ARRAY 41 * 42 * Helper macro to be invoked from a sysctl handler function. 43 * 44 * The macro compares the `arg2' sysctl handler argument 45 * with the `expected_array_size' macro parameter. 46 * 47 * If `arg2' is equal to `expected_array_size', the macro will 48 * define two local variables, the names of which are controlled 49 * by macro parameters: 50 * 51 * element_type *`array_var'; 52 * unsigned int `len_var'; 53 * 54 * The `array_var' local variable will be sized in accordance 55 * to the parameters. It does not use `__sized_by` annotation, 56 * to allow the body of the handler function to change the values, 57 * if needed. 58 * 59 * If `arg2' is not equal to `expected_array_size', the macro 60 * will return from the sysctl handler function with the 61 * EINVAL code. 62 */ 63 #define DECLARE_SYSCTL_HANDLER_ARG_ARRAY(element_type, \ 64 expected_array_size, \ 65 array_var, \ 66 len_var) \ 67 unsigned int len_var = (unsigned int)arg2; \ 68 if (len_var != (expected_array_size)) { \ 69 return EINVAL; \ 70 } \ 71 element_type * array_var = __unsafe_forge_bidi_indexable( \ 72 element_type *, arg1, len_var * sizeof(element_type)) 73 74 75 #endif /* _NET_SYSCTL_H_ */ 76