2 * Copyright (c) 2008, 2009 Nicira Networks.
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
29 static bool inited = false;
33 if (gettimeofday(&tv, NULL) < 0) {
34 ovs_fatal(errno, "gettimeofday");
36 srand(tv.tv_sec ^ tv.tv_usec);
41 random_bytes(void *p_, size_t n)
60 if (RAND_MAX >= UINT16_MAX) {
65 random_bytes(&x, sizeof x);
73 if (RAND_MAX >= UINT32_MAX) {
76 } else if (RAND_MAX == INT32_MAX) {
78 return rand() | ((rand() & 1u) << 31);
81 random_bytes(&x, sizeof x);
89 return random_uint32() % max;