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Diffstat (limited to 'JavaScriptCore/wtf/RandomNumberSeed.h')
-rw-r--r-- | JavaScriptCore/wtf/RandomNumberSeed.h | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/JavaScriptCore/wtf/RandomNumberSeed.h b/JavaScriptCore/wtf/RandomNumberSeed.h new file mode 100644 index 0000000..f994fd9 --- /dev/null +++ b/JavaScriptCore/wtf/RandomNumberSeed.h @@ -0,0 +1,71 @@ +/* + * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/) + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY + * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef WTF_RandomNumberSeed_h +#define WTF_RandomNumberSeed_h + +#include <stdlib.h> +#include <time.h> + +#if HAVE(SYS_TIME_H) +#include <sys/time.h> +#endif + +#if PLATFORM(UNIX) +#include <sys/types.h> +#include <unistd.h> +#endif + +// Internal JavaScriptCore usage only +namespace WTF { + +inline void initializeRandomNumberGenerator() +{ +#if PLATFORM(DARWIN) + // On Darwin we use arc4random which initialises itself. +#elif COMPILER(MSVC) && defined(_CRT_RAND_S) + // On Windows we use rand_s which intialises itself +#elif PLATFORM(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 +} + +inline void initializeWeakRandomNumberGenerator() +{ +#if COMPILER(MSVC) && defined(_CRT_RAND_S) + // We need to initialise windows rand() explicitly for Math.random + unsigned seed = 0; + rand_s(&seed); + srand(seed); +#endif +} +} + +#endif |