70 lines
2.5 KiB
C
70 lines
2.5 KiB
C
/****************************************************************************
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* libs/libc/termios/lib_ttyname.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 <errno.h>
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#include <limits.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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/****************************************************************************
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* Name: ttyname
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*
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* Description:
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* The ttyname() function shall return a pointer to a string containing
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* a null-terminated pathname of the terminal associated with file
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* descriptor fildes. The application shall not modify the string returned.
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* The returned pointer might be invalidated or the string content might
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* be overwritten by a subsequent call to ttyname(). The returned pointer
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* and the string content might also be invalidated if the calling thread
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* is terminated.
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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
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* a terminal.
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*
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* Returned Value:
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* Upon successful completion, ttyname() shall return a pointer to
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* a string. Otherwise, a null pointer shall be returned and errno
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* set to indicate the error.
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*
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****************************************************************************/
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FAR char *ttyname(int fd)
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{
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static char name[TTY_NAME_MAX];
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int ret;
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ret = ttyname_r(fd, name, TTY_NAME_MAX);
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if (ret != 0)
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{
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set_errno(ret);
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return NULL;
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}
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return name;
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}
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