107 lines
2.9 KiB
C
107 lines
2.9 KiB
C
/****************************************************************************
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* libs/libc/uuid/lib_uuid_create.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <sys/random.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <uuid.h>
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static int uuid_getrandom(FAR void *buf, size_t size, int flags)
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{
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FAR char *tmp = buf;
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while (size > 0)
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{
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ssize_t ret = getrandom(tmp, size, flags);
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if (ret < 0)
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{
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if (get_errno() == EINTR)
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{
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continue;
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}
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return ret;
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}
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tmp += ret;
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size -= ret;
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}
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return 0;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* uuid_create_nil
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*
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* Description:
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* Create an UUID.
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*
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* See also:
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* http://www.opengroup.org/onlinepubs/009629399/uuid_create.htm
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*
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****************************************************************************/
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void uuid_create(FAR uuid_t *u, FAR uint32_t *status)
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{
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int ret;
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ret = uuid_getrandom(u, sizeof(uuid_t), 0);
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if (ret < 0)
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{
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ret = uuid_getrandom(u, sizeof(uuid_t), GRND_RANDOM);
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}
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if (ret < 0)
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{
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FAR unsigned long *beg = (FAR unsigned long *)u;
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FAR unsigned long *end = (FAR unsigned long *)(u + 1);
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while (beg < end)
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{
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*beg++ = rand();
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}
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}
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u->clock_seq_hi_and_reserved &= ~(1 << 6);
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u->clock_seq_hi_and_reserved |= (1 << 7);
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u->time_hi_and_version &= ~(1 << 12);
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u->time_hi_and_version &= ~(1 << 13);
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u->time_hi_and_version |= (1 << 14);
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u->time_hi_and_version &= ~(1 << 15);
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if (status)
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{
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*status = uuid_s_ok;
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}
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}
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