bf733f7213
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com> Change-Id: I82a60ded48ea3437bd5f2b4fe328294d7077b040
86 lines
2.8 KiB
C
86 lines
2.8 KiB
C
/****************************************************************************
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* libs/libc/stdlib/lib_ptsnamer.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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#include <stdio.h>
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#include <assert.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: ptsname_r
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*
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* Description:
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* The ptsname_r() function is the reentrant equivalent of ptsname().
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* It returns the name of the slave pseudoterminal device as a null-
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* terminated string in the buffer pointed to by buf. The buflen
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* argument specifies the number of bytes available in buf.
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*
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* Returned Value:
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* On success, ptsname_r() returns 0. On failure, a nonzero value is
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* returned and errno is set to indicate the error.
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*
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* EINVAL (ptsname_r() only) buf is NULL.
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* ENOTTY fd does not refer to a pseudoterminal master device.
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* ERANGE (ptsname_r() only) buf is too small.
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*
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****************************************************************************/
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int ptsname_r(int fd, FAR char *buf, size_t buflen)
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{
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int ptyno;
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int ret;
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DEBUGASSERT(buf != NULL);
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/* Get the slave PTY number */
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ret = ioctl(fd, TIOCGPTN, (unsigned long)((uintptr_t)&ptyno));
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if (ret < 0)
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{
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return ret;
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}
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/* Create the device name. This current does not handler EINVAL or ERANGE
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* error detection.
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*/
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#ifdef CONFIG_PSEUDOTERM_SUSV1
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snprintf(buf, buflen, "/dev/pts/%d", ptyno);
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#else
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snprintf(buf, buflen, "/dev/ttyp%d", ptyno);
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#endif
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return OK;
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}
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#endif /* CONFIG_PSEUDOTERM */
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