Blame src/unix/random-getentropy.c

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/* Copyright libuv contributors. All rights reserved.
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a copy
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 * of this software and associated documentation files (the "Software"), to
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 * deal in the Software without restriction, including without limitation the
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 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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 * sell copies of the Software, and to permit persons to whom the Software is
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 * furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included in
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 * all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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 * IN THE SOFTWARE.
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 */
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#include "uv.h"
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#include "internal.h"
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#include <stddef.h>
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#include <dlfcn.h>
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typedef int (*uv__getentropy_cb)(void *, size_t);
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static uv__getentropy_cb uv__getentropy;
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static uv_once_t once = UV_ONCE_INIT;
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static void uv__random_getentropy_init(void) {
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  uv__getentropy = (uv__getentropy_cb) dlsym(RTLD_DEFAULT, "getentropy");
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}
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int uv__random_getentropy(void* buf, size_t buflen) {
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  size_t pos;
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  size_t stride;
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  uv_once(&once, uv__random_getentropy_init);
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  if (uv__getentropy == NULL)
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    return UV_ENOSYS;
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  /* getentropy() returns an error for requests > 256 bytes. */
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  for (pos = 0, stride = 256; pos + stride < buflen; pos += stride)
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    if (uv__getentropy((char *) buf + pos, stride))
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      return UV__ERR(errno);
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  if (uv__getentropy((char *) buf + pos, buflen - pos))
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    return UV__ERR(errno);
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  return 0;
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}