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  • Committer: Package Import Robot
  • Author(s): Sylvestre Ledru
  • Date: 2013-05-02 13:11:51 UTC
  • Revision ID: package-import@ubuntu.com-20130502131151-q8dvteqr1ef2x7xz
Tags: upstream-1.4.1~20130504~adb56cb
Import upstream version 1.4.1~20130504~adb56cb

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system/lib/libcxx/random.cpp
 
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//===-------------------------- random.cpp --------------------------------===//
 
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//
 
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//                     The LLVM Compiler Infrastructure
 
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//
 
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// This file is dual licensed under the MIT and the University of Illinois Open
 
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// Source Licenses. See LICENSE.TXT for details.
 
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//
 
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//===----------------------------------------------------------------------===//
 
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#include "random"
 
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#include "system_error"
 
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#ifdef __sun__
 
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#define rename solaris_headers_are_broken
 
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#endif
 
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#include <fcntl.h>
 
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#include <unistd.h>
 
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#include <errno.h>
 
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_LIBCPP_BEGIN_NAMESPACE_STD
 
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random_device::random_device(const string& __token)
 
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    : __f_(open(__token.c_str(), O_RDONLY))
 
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{
 
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    if (__f_ <= 0)
 
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        __throw_system_error(errno, ("random_device failed to open " + __token).c_str());
 
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}
 
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random_device::~random_device()
 
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{
 
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    close(__f_);
 
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}
 
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unsigned
 
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random_device::operator()()
 
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{
 
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    unsigned r;
 
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    read(__f_, &r, sizeof(r));
 
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    return r;
 
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}
 
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double
 
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random_device::entropy() const _NOEXCEPT
 
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{
 
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    return 0;
 
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}
 
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_LIBCPP_END_NAMESPACE_STD