61 lines
2.2 KiB
C
61 lines
2.2 KiB
C
/****************************************************************************
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* libs/libc/stdlib/lib_unlockpt.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 <stdlib.h>
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#ifdef CONFIG_PSEUDOTERM
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: unlockpt
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*
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* Description:
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* The unlockpt() function unlocks the slave pseudoterminal device
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* corresponding to the master pseudoterminal referred to by fd.
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* unlockpt() must be called before opening the slave side of a
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* pseudoterminal.
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*
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* Returned Value:
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* When successful, unlockpt() returns 0. Otherwise, it returns -1 and
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* sets errno appropriately.
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*
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* EBADF - The fd argument is not a file descriptor open for writing.
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* EINVAL - The fd argument is not associated with a master
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* pseudoterminal
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*
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****************************************************************************/
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int unlockpt(int fd)
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{
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return ioctl(fd, TIOCSPTLCK, 0);
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}
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#endif /* CONFIG_PSEUDOTERM */
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