| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| #ifndef WTF_RandomNumberSeed_h |
| #define WTF_RandomNumberSeed_h |
| |
| #include "RandomNumber.h" |
| #include <stdlib.h> |
| #include <time.h> |
| |
| #if HAVE(SYS_TIME_H) |
| #include <sys/time.h> |
| #endif |
| |
| #if OS(UNIX) |
| #include <sys/types.h> |
| #include <unistd.h> |
| #endif |
| |
| namespace WTF { |
| |
| inline void initializeRandomNumberGenerator() |
| { |
| #if OS(DARWIN) |
| // On Darwin we use arc4random which initialises itself. |
| #elif COMPILER(MSVC) && defined(_CRT_RAND_S) |
| // On Windows we use rand_s which initialises itself |
| #elif OS(UNIX) |
| // srandomdev is not guaranteed to exist on linux so we use this poor seed, this should be improved |
| timeval time; |
| gettimeofday(&time, 0); |
| srandom(static_cast<unsigned>(time.tv_usec * getpid())); |
| #else |
| srand(static_cast<unsigned>(time(0))); |
| #endif |
| |
| } |
| |
| } |
| |
| #endif |
