98 lines
3.9 KiB
C
98 lines
3.9 KiB
C
/****************************************************************************
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* libs/libc/termios/lib_tcsetattr.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/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: tcsetattr
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*
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* Description:
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* The tcsetattr() function sets the parameters associated with the
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* terminal referred to by the open file descriptor 'fd' from the termios
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* structure referenced by 'termiop' as follows:
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*
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* If 'options' is TCSANOW, the change will occur immediately.
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*
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* If 'options' is TCSADRAIN, the change will occur after all output
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* written to 'fd' is transmitted. This function should be used when
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* changing parameters that affect output.
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*
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* If 'options' is TCSAFLUSH, the change will occur after all
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* output written to 'fd' is transmitted, and all input so far received but
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* not read will be discarded before the change is made.
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*
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* The tcsetattr() function will return successfully if it was able to
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* perform any of the requested actions, even if some of the requested
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* actions could not be performed. It will set all the attributes that
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* implementation supports as requested and leave all the attributes not
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* supported by the implementation unchanged. If no part of the request
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* can be honoured, it will return -1 and set errno to EINVAL.
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*
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* The effect of tcsetattr() is undefined if the value of the termios
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* structure pointed to by 'termiop' was not derived from the result of
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* a call to tcgetattr() on 'fd'; an application should modify only fields
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* and flags defined by this specification between the call to tcgetattr()
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* and tcsetattr(), leaving all other fields and flags unmodified.
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*
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* Returned Value:
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*
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* Upon successful completion, 0 is returned. Otherwise, -1 is returned
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* and errno is set to indicate the error. The following errors may be
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* reported:
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*
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* - EBADF: The 'fd' argument is not a valid file descriptor.
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* - EINTR: A signal interrupted tcsetattr().
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* - EINVAL: The 'options' argument is not a supported value, or
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* an attempt was made to change an attribute represented in the
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* termios structure to an unsupported value.
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* - ENOTTY: The file associated with 'fd' is not a terminal.
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*
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****************************************************************************/
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int tcsetattr(int fd, int options, FAR const struct termios *termiosp)
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{
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if (options != TCSANOW)
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{
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tcdrain(fd);
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}
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if (options == TCSAFLUSH)
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{
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tcflush(fd, TCIFLUSH);
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}
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return ioctl(fd, TCSETS, (unsigned long)(uintptr_t)termiosp);
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}
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