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Merge topic 'reduce-entropy-consumption' 

f23f18ab cmSystemTools: Avoid excess entropy consumption by RandomSeed (#15976)
b13a74b3 cmSystemTools: Remove unused include <fcntl.h>
This commit is contained in:
Brad King 2016-02-19 09:47:41 -05:00 committed by CMake Topic Stage
parent c387325d4a f23f18ab68
commit 39a80a1feb
1 changed files with 5 additions and 4 deletions
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9
Source/cmSystemTools.cxx
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@ -60,8 +60,7 @@
#endif
#if defined(CMAKE_BUILD_WITH_CMAKE)
# include <fcntl.h>
# include "cmCryptoHash.h"
# include "cmCryptoHash.h"
#endif
#if defined(CMAKE_USE_ELF_PARSER)
@ -2184,8 +2183,10 @@ unsigned int cmSystemTools::RandomSeed()
} seed;
// Try using a real random source.
cmsys::ifstream fin("/dev/urandom");
if(fin && fin.read(seed.bytes, sizeof(seed)) &&
cmsys::ifstream fin;
fin.rdbuf()->pubsetbuf(0, 0); // Unbuffered read.
fin.open("/dev/urandom");
if(fin.good() && fin.read(seed.bytes, sizeof(seed)) &&
fin.gcount() == sizeof(seed))
{
return seed.integer;