1 /* 2 * This file and its contents are supplied under the terms of the 3 * Common Development and Distribution License ("CDDL"), version 1.0. 4 * You may only use this file in accordance with the terms of version 5 * 1.0 of the CDDL. 6 * 7 * A full copy of the text of the CDDL should have accompanied this 8 * source. A copy of the CDDL is also available via the Internet at 9 * http://www.illumos.org/license/CDDL. 10 */ 11 12 /* 13 * Copyright (c) 2018, Joyent, Inc. 14 */ 15 16 /* 17 * getentropy(3C) is an OpenBSD compatible wrapper around getrandom(2). 18 */ 19 20 #include <errno.h> 21 #include <sys/random.h> 22 23 int getentropy(void * buf,size_t buflen)24getentropy(void *buf, size_t buflen) 25 { 26 ssize_t ret; 27 28 if (buflen > 256) { 29 errno = EIO; 30 return (-1); 31 } 32 33 ret = getrandom(buf, buflen, 0); 34 if (ret == -1 || ret != buflen) { 35 if (errno != EFAULT) 36 errno = EIO; 37 return (-1); 38 } 39 40 return (0); 41 } 42