random_adaptors.h revision 255379
1/*- 2 * Copyright (c) 2013 Arthur Mesh <arthurmesh@gmail.com> 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 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 * $FreeBSD: head/sys/dev/random/random_adaptors.h 255379 2013-09-07 22:07:36Z markm $ 27 */ 28 29#ifndef __RANDOM_ADAPTORS_H__ 30#define __RANDOM_ADAPTORS_H__ 31 32#include <sys/eventhandler.h> 33 34struct random_adaptors { 35 LIST_ENTRY(random_adaptors) entries; /* list of providers */ 36 const char *name; /* name of random adaptor */ 37 struct random_adaptor *rsp; 38}; 39 40struct random_adaptor *random_adaptor_get(const char *); 41int random_adaptor_register(const char *, struct random_adaptor *); 42void random_adaptor_choose(struct random_adaptor **); 43 44extern struct random_adaptor *random_adaptor; 45 46/* 47 * random_adaptor's should be registered prior to 48 * random module (SI_SUB_DRIVERS/SI_ORDER_MIDDLE) 49 */ 50#define RANDOM_ADAPTOR_MODULE(name, modevent, ver) \ 51 static moduledata_t name##_mod = { \ 52 #name, \ 53 modevent, \ 54 0 \ 55 }; \ 56 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, \ 57 SI_ORDER_SECOND); \ 58 MODULE_VERSION(name, ver); \ 59 MODULE_DEPEND(name, random, 1, 1, 1); 60 61typedef void (*random_adaptor_attach_hook)(void *, struct random_adaptor *); 62EVENTHANDLER_DECLARE(random_adaptor_attach, random_adaptor_attach_hook); 63 64/* kern.random sysctls */ 65#ifdef SYSCTL_DECL /* from sysctl.h */ 66SYSCTL_DECL(_kern_random); 67#endif /* SYSCTL_DECL */ 68 69#endif /* __RANDOM_ADAPTORS_H__ */ 70