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/*
* Copyright (C) 2020 The Android Open Source Project
*
* 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.
*/
#include "Utils.h"
#include <android-base/file.h>
#include <string.h>
using android::base::ErrnoError;
using android::base::Result;
namespace android {
void zeroMemory(uint8_t* data, size_t size) {
memset(data, 0, size);
}
Result<void> setNonBlocking(android::base::borrowed_fd fd) {
int flags = TEMP_FAILURE_RETRY(fcntl(fd.get(), F_GETFL));
if (flags == -1) {
return ErrnoError() << "Could not get flags for fd";
}
if (int ret = TEMP_FAILURE_RETRY(fcntl(fd.get(), F_SETFL, flags | O_NONBLOCK)); ret == -1) {
return ErrnoError() << "Could not set non-blocking flag for fd";
}
return {};
}
status_t getRandomBytes(uint8_t* data, size_t size) {
int ret = TEMP_FAILURE_RETRY(open("/dev/urandom", O_RDONLY | O_CLOEXEC | O_NOFOLLOW));
if (ret == -1) {
return -errno;
}
base::unique_fd fd(ret);
if (!base::ReadFully(fd, data, size)) {
return -errno;
}
return OK;
}
} // namespace android
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