c798076084
Sebastien Lorquet has submitted the ICL and we can migrate the licenses to Apache. Gregory Nutt has submitted the SGA and we can migrate the licenses to Apache. Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
87 lines
2.7 KiB
C
87 lines
2.7 KiB
C
/****************************************************************************
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* drivers/serial/tcdrain.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 <nuttx/config.h>
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#include <sys/ioctl.h>
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#include <termios.h>
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#include <errno.h>
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#include <nuttx/cancelpt.h>
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#include <nuttx/serial/tioctl.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: tcdrain
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*
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* Description:
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* Function for draining the output buffer of a terminal/serial device
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*
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* Input Parameters:
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* fd - The 'fd' argument is an open file descriptor associated with a
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* terminal.
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*
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* Returned Value:
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* Upon successful completion, 0 is returned. Otherwise, -1 is returned and
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* errno is set to indicate the error.
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*
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****************************************************************************/
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int tcdrain(int fd)
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{
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int ret;
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/* tcdrain is a cancellation point */
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if (enter_cancellation_point())
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{
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#ifdef CONFIG_CANCELLATION_POINTS
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/* If there is a pending cancellation, then do not perform
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* the wait. Exit now with ECANCELED.
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*/
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set_errno(ECANCELED);
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leave_cancellation_point();
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return ERROR;
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#endif
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}
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/* Perform the TCDRM IOCTL command. It is safe to use the file descriptor
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* in this context because we are executing on the calling application's
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* thread.
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*
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* NOTE: ioctl() will set the errno variable and return ERROR if any error
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* occurs.
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*/
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ret = ioctl(fd, TCDRN, (unsigned long)0);
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leave_cancellation_point();
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return ret;
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}
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