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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; }