| 1 | /* |
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| 2 | * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/) |
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| 3 | * |
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| 4 | * Redistribution and use in source and binary forms, with or without |
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| 5 | * modification, are permitted provided that the following conditions |
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| 6 | * are met: |
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| 7 | * 1. Redistributions of source code must retain the above copyright |
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| 8 | * notice, this list of conditions and the following disclaimer. |
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| 9 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer in the |
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| 11 | * documentation and/or other materials provided with the distribution. |
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| 12 | * |
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| 13 | * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
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| 14 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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| 16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
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| 17 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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| 18 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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| 19 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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| 20 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
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| 21 | * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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| 23 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 24 | */ |
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| 25 | |
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| 26 | #ifndef WTF_RandomNumberSeed_h |
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| 27 | #define WTF_RandomNumberSeed_h |
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| 28 | |
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| 29 | #include <stdlib.h> |
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| 30 | #include <time.h> |
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| 31 | |
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| 32 | #if HAVE(SYS_TIME_H) |
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| 33 | #include <sys/time.h> |
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| 34 | #endif |
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| 35 | |
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| 36 | #if OS(UNIX) |
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| 37 | #include <sys/types.h> |
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| 38 | #include <unistd.h> |
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| 39 | #endif |
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| 40 | |
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| 41 | #if OS(WINCE) |
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| 42 | extern "C" { |
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| 43 | void init_by_array(unsigned long init_key[],int key_length); |
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| 44 | } |
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| 45 | #endif |
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| 46 | |
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| 47 | // Internal JavaScriptCore usage only |
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| 48 | namespace WTF { |
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| 49 | |
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| 50 | inline void initializeRandomNumberGenerator() |
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| 51 | { |
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| 52 | #if OS(DARWIN) |
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| 53 | // On Darwin we use arc4random which initialises itself. |
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| 54 | #elif OS(WINCE) |
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| 55 | // initialize rand() |
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| 56 | srand(static_cast<unsigned>(time(0))); |
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| 57 | |
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| 58 | // use rand() to initialize the real RNG |
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| 59 | unsigned long initializationBuffer[4]; |
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| 60 | initializationBuffer[0] = (rand() << 16) | rand(); |
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| 61 | initializationBuffer[1] = (rand() << 16) | rand(); |
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| 62 | initializationBuffer[2] = (rand() << 16) | rand(); |
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| 63 | initializationBuffer[3] = (rand() << 16) | rand(); |
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| 64 | init_by_array(initializationBuffer, 4); |
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| 65 | #elif COMPILER(MSVC) && defined(_CRT_RAND_S) |
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| 66 | // On Windows we use rand_s which initialises itself |
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| 67 | #elif OS(UNIX) |
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| 68 | // srandomdev is not guaranteed to exist on linux so we use this poor seed, this should be improved |
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| 69 | timeval time; |
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| 70 | gettimeofday(tv: &time, tz: 0); |
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| 71 | srandom(seed: static_cast<unsigned>(time.tv_usec * getpid())); |
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| 72 | #else |
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| 73 | srand(static_cast<unsigned>(time(0))); |
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| 74 | #endif |
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| 75 | } |
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| 76 | |
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| 77 | inline void initializeWeakRandomNumberGenerator() |
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| 78 | { |
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| 79 | #if COMPILER(MSVC) && defined(_CRT_RAND_S) |
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| 80 | // We need to initialise windows rand() explicitly for Math.random |
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| 81 | unsigned seed = 0; |
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| 82 | rand_s(&seed); |
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| 83 | srand(seed); |
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| 84 | #endif |
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| 85 | } |
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| 86 | } |
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| 87 | |
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| 88 | #endif |
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| 89 | |
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