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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"
#ifdef __linux__
#include "linux-syscalls.h"
#define uv__random_getrandom_init() 0
#else /* !__linux__ */
#include <stddef.h>
#include <dlfcn.h>
typedef ssize_t (*uv__getrandom_cb)(void *, size_t, unsigned);
static uv__getrandom_cb uv__getrandom;
static uv_once_t once = UV_ONCE_INIT;
static void uv__random_getrandom_init_once(void) {
uv__getrandom = (uv__getrandom_cb) dlsym(RTLD_DEFAULT, "getrandom");
}
static int uv__random_getrandom_init(void) {
uv_once(&once, uv__random_getrandom_init_once);
if (uv__getrandom == NULL)
return UV_ENOSYS;
return 0;
}
#endif /* !__linux__ */
int uv__random_getrandom(void* buf, size_t buflen) {
ssize_t n;
size_t pos;
int rc;
rc = uv__random_getrandom_init();
if (rc != 0)
return rc;
for (pos = 0; pos != buflen; pos += n) {
do {
n = buflen - pos;
/* Most getrandom() implementations promise that reads <= 256 bytes
* will always succeed and won't be interrupted by signals.
* It's therefore useful to split it up in smaller reads because
* one big read may, in theory, continuously fail with EINTR.
*/
if (n > 256)
n = 256;
n = uv__getrandom((char *) buf + pos, n, 0);
} while (n == -1 && errno == EINTR);
if (n == -1)
return UV__ERR(errno);
if (n == 0)
return UV_EIO;
}
return 0;
}
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