55 lines
1.5 KiB
C++
55 lines
1.5 KiB
C++
/******************************************************************************
|
|
*
|
|
* Copyright 2016 Google, Inc.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at:
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*
|
|
******************************************************************************/
|
|
|
|
#define LOG_TAG "bt_osi_rand"
|
|
|
|
#include <base/logging.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
|
|
#include "check.h"
|
|
#include "osi/include/log.h"
|
|
#include "osi/include/osi.h"
|
|
|
|
#define RANDOM_PATH "/dev/urandom"
|
|
|
|
int osi_rand(void) {
|
|
int rand;
|
|
int rand_fd = open(RANDOM_PATH, O_RDONLY);
|
|
|
|
if (rand_fd == INVALID_FD) {
|
|
LOG_ERROR("%s can't open rand fd %s: %s ", __func__, RANDOM_PATH,
|
|
strerror(errno));
|
|
CHECK(rand_fd != INVALID_FD);
|
|
}
|
|
|
|
ssize_t read_bytes = read(rand_fd, &rand, sizeof(rand));
|
|
close(rand_fd);
|
|
|
|
CHECK(read_bytes == sizeof(rand));
|
|
|
|
if (rand < 0) rand = -rand;
|
|
|
|
return rand;
|
|
}
|