Cory McWilliams
79022e1e1f
git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@3621 ed5197a5-7fde-0310-b194-c3ffbd925b24
89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/* 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;
|
|
}
|