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