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#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "WAVM/Inline/BasicTypes.h"
#include "WAVM/Inline/Errors.h"
#include "WAVM/Platform/Random.h"
using namespace WAVM;
using namespace WAVM::Platform;
static void readDevRandom(U8* outRandomBytes, Uptr numBytes)
{
static I32 randomFD = open("/dev/urandom", O_RDONLY);
if(randomFD < 0) { Errors::fatalf("Failed to open /dev/urandom: %s", strerror(errno)); }
while(numBytes > 0)
{
I32 result = read(randomFD, outRandomBytes, numBytes);
if(result >= 0)
{
outRandomBytes += result;
numBytes -= result;
}
else if(errno != EINTR)
{
Errors::fatalf("Failed to read from /dev/urandom: %s", strerror(errno));
}
}
}
#if 0 // __linux__
#include <sys/random.h>
void Platform::getCryptographicRNG(U8* outRandomBytes, Uptr numBytes)
{
while(numBytes > 0)
{
ssize_t result = getrandom(outRandomBytes, numBytes, 0);
if(result >= 0)
{
outRandomBytes += result;
numBytes -= result;
}
else if(errno == ENOSYS)
{
readDevRandom(outRandomBytes, numBytes);
break;
}
else if(errno != EINTR)
{
Errors::fatalf("getrandom failed: %s", strerror(errno));
}
};
}
#else
void Platform::getCryptographicRNG(U8* outRandomBytes, Uptr numBytes)
{
readDevRandom(outRandomBytes, numBytes);
}
#endif
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