xiaoxiang781216 commented on a change in pull request #5837: URL: https://github.com/apache/incubator-nuttx/pull/5837#discussion_r834590574
########## File path: libs/libc/misc/lib_getrandom.c ########## @@ -0,0 +1,91 @@ +/**************************************************************************** + * libs/libc/misc/lib_getrandom.c + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. The + * ASF licenses this file to you 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. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <sys/random.h> +#include <fcntl.h> +#include <unistd.h> + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: getrandom + * + * Description: + * Fill a buffer of arbitrary length with randomness. This is the + * preferred interface for getting random numbers. The traditional + * /dev/random approach is susceptible for things like the attacker + * exhausting file descriptors on purpose. + * + * Note that this function cannot fail, other than by asserting. + * + * Input Parameters: + * bytes - Buffer for returned random bytes + * nbytes - Number of bytes requested. + * flags - Bit mask that can contain zero or more of the ORed values + * together. + * + * Returned Value: + * On success, getrandom() returns the number of bytes that were copied + * to the buffer buf. This may be less than the number of bytes + * requested via buflen if either GRND_RANDOM was specified in flags and + * insufficient entropy was present in the random source or the system + * call was interrupted by a signal. Review comment: Done. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@nuttx.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
