mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-01 17:30:07 +00:00
51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
/* Hurdish implementation of getrandom
|
|
Copyright (C) 2016-2020 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <sys/random.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <not-cancel.h>
|
|
|
|
/* Write up to LENGTH bytes of randomness starting at BUFFER.
|
|
Return the number of bytes written, or -1 on error. */
|
|
ssize_t
|
|
__getrandom (void *buffer, size_t length, unsigned int flags)
|
|
{
|
|
const char *random_source = "/dev/urandom";
|
|
int open_flags = O_RDONLY | O_CLOEXEC;
|
|
size_t amount_read;
|
|
int fd;
|
|
|
|
if (flags & GRND_RANDOM)
|
|
random_source = "/dev/random";
|
|
|
|
if (flags & GRND_NONBLOCK)
|
|
open_flags |= O_NONBLOCK;
|
|
|
|
fd = __open_nocancel(random_source, open_flags);
|
|
if (fd == -1)
|
|
return -1;
|
|
|
|
amount_read = __read_nocancel(fd, buffer, length);
|
|
__close_nocancel_nostatus(fd);
|
|
return amount_read;
|
|
}
|
|
|
|
libc_hidden_def (__getrandom)
|
|
weak_alias (__getrandom, getrandom)
|