67 lines
2.3 KiB
C
67 lines
2.3 KiB
C
/****************************************************************************
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* apps/canutils/canlib/canlib_getloopback.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/ioctl.h>
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#include <debug.h>
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#include <errno.h>
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#include <nuttx/can/can.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: canlib_getloopback
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*
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* Description:
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* Wrapper for CANIOC_GET_CONNMODES.
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*
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* Input Parameter:
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* fd - file descriptor of an opened can device
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* loopback - pointer to a buffer to store the current loopback mode state.
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*
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* Returned Value:
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* Zero (OK) is returned on success. Otherwise -1 (ERROR)
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* is returned with the errno variable set to indicate the
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* nature of the error.
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*
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****************************************************************************/
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int canlib_getloopback(int fd, FAR bool *loopback)
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{
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int ret;
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struct canioc_connmodes_s connmodes;
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ret = ioctl(fd, CANIOC_GET_CONNMODES, (unsigned long)&connmodes);
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if (ret != OK)
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{
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canerr("CANIOC_GET_CONNMODES failed, errno=%d\n", errno);
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return ret;
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}
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*loopback = connmodes.bm_loopback;
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return ret;
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}
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