58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
/****************************************************************************
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* libs/libc/lib_eventfd.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/eventfd.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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int eventfd_read(int fd, FAR eventfd_t *value)
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{
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return read(fd, value, sizeof (eventfd_t)) != sizeof (eventfd_t) ? -1 : 0;
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}
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int eventfd_write(int fd, eventfd_t value)
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{
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return write(fd, &value,
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sizeof (eventfd_t)) != sizeof (eventfd_t) ? -1 : 0;
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}
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int eventfd_get_minor(int fd)
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{
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int ret;
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int minor;
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ret = ioctl(fd, EFD_FIOC_MINOR, &minor);
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if (ret < 0)
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{
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return ret;
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}
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return minor;
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}
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