2fa1e55628
Note: this patch can get file path from root pseudo file handle, but a general infrastructure is setup for other file system too. Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com> Change-Id: I86cd79ebb741f2f43fdd398bb7498c40687d949b
86 lines
2.8 KiB
C
86 lines
2.8 KiB
C
/****************************************************************************
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* libs/libc/termios/lib_ttynamer.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 <fcntl.h>
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#include <string.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_r
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*
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* Description:
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* The ttyname_r() function shall store the null-terminated pathname of
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* the terminal associated with the file descriptor fildes in the
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* character array referenced by name. The array is namesize characters
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* long and should have space for the name and the terminating null
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* character. The maximum length of the terminal name shall be
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* {TTY_NAME_MAX}.
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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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* buf - Caller provided buffer to hold tty name.
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* buflen - The size of the caller-provided buffer.
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*
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* Returned Value:
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* If successful, the ttyname_r() function shall return zero.
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* Otherwise, an error number shall be returned to indicate the error.
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*
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****************************************************************************/
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int ttyname_r(int fd, FAR char *buf, size_t buflen)
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{
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if (!isatty(fd))
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{
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return ENOTTY;
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}
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if (buflen >= TTY_NAME_MAX)
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{
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return fcntl(fd, F_GETPATH, buf) < 0 ? get_errno() : 0;
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}
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else
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{
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char name[TTY_NAME_MAX];
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if (fcntl(fd, F_GETPATH, name) < 0)
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{
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return get_errno();
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}
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if (strlen(name) >= buflen)
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{
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return ERANGE;
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}
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strcpy(buf, name);
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return OK;
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}
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}
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