58 lines
2.2 KiB
C
58 lines
2.2 KiB
C
/****************************************************************************
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* libs/libc/termios/lib_isatty.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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/* Source:
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* https://github.com/raggi/apue.2e/blob/master/termios/isatty.c
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* based on Advanced Programming in the UNIX Environment
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*/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <termios.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: isatty
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*
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* Description:
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* Return a non-zero (true) value if the file descriptor, fd, corresponds
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* to a TTYY.
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*
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* NOTE: NuttX, of course, does not have true TTYs in the sense that this
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* function is intended. In this implementation, the function simply
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* returns true if the file descriptor is associated with a driver that
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* responds wo tcgetattr() without an error -- that it, the driver supports
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* the NuttX TCGETS ioctl command.
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*
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* Of course, that can only be true if CONFIG_SERIAL_TERMIOS=y.
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*
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****************************************************************************/
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int isatty(int fd)
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{
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struct termios ts;
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return (tcgetattr(fd, &ts) >= 0);
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}
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