1 /* $OpenBSD: arc4random.h,v 1.4 2015/01/15 06:57:18 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 1996, David Mazieres <dm@uun.org> 5 * Copyright (c) 2008, Damien Miller <djm@openbsd.org> 6 * Copyright (c) 2013, Markus Friedl <markus@openbsd.org> 7 * Copyright (c) 2014, Theo de Raadt <deraadt@openbsd.org> 8 * 9 * Permission to use, copy, modify, and distribute this software for any 10 * purpose with or without fee is hereby granted, provided that the above 11 * copyright notice and this permission notice appear in all copies. 12 * 13 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 14 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 15 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 16 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 17 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 18 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 19 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 20 * 21 * $FreeBSD$ 22 */ 23 24 /* 25 * Stub functions for portability. 26 */ 27 #include <sys/mman.h> 28 29 #include <signal.h> 30 31 static pthread_mutex_t arc4random_mtx = PTHREAD_MUTEX_INITIALIZER; 32 #define _ARC4_LOCK() \ 33 do { \ 34 if (__isthreaded) \ 35 _pthread_mutex_lock(&arc4random_mtx); \ 36 } while (0) 37 38 #define _ARC4_UNLOCK() \ 39 do { \ 40 if (__isthreaded) \ 41 _pthread_mutex_unlock(&arc4random_mtx); \ 42 } while (0) 43 44 static inline void 45 _getentropy_fail(void) 46 { 47 raise(SIGKILL); 48 } 49 50 static inline int 51 _rs_allocate(struct _rs **rsp, struct _rsx **rsxp) 52 { 53 struct { 54 struct _rs rs; 55 struct _rsx rsx; 56 } *p; 57 58 if ((p = mmap(NULL, sizeof(*p), PROT_READ|PROT_WRITE, 59 MAP_ANON|MAP_PRIVATE, -1, 0)) == MAP_FAILED) 60 return (-1); 61 if (minherit(p, sizeof(*p), INHERIT_ZERO) == -1) { 62 munmap(p, sizeof(*p)); 63 return (-1); 64 } 65 66 *rsp = &p->rs; 67 *rsxp = &p->rsx; 68 return (0); 69 } 70 71 static inline void 72 _rs_forkdetect(void) 73 { 74 } 75