819ebe7356
Add flockfile(), ftrylockfile() and funlockfile() functions [1].
[1] POSIX.1-2008 / System Interfaces / flockfile
https://pubs.opengroup.org/onlinepubs/9699919799.2008edition/functions/flockfile.html
Signed-off-by: Miguel Herranz <miguel@midokura.com>
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
57 lines
1.9 KiB
C
57 lines
1.9 KiB
C
/****************************************************************************
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* libs/libc/stdio/lib_vfprintf.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 <stdio.h>
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#include "libc.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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int vfprintf(FAR FILE *stream, FAR const IPTR char *fmt, va_list ap)
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{
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struct lib_stdoutstream_s stdoutstream;
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int n = ERROR;
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/* Wrap the stream in a stream object and let lib_vsprintf
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* do the work.
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*/
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lib_stdoutstream(&stdoutstream, stream);
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/* Hold the stream semaphore throughout the lib_vsprintf
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* call so that this thread can get its entire message out
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* before being pre-empted by the next thread.
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*/
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flockfile(stream);
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n = lib_vsprintf(&stdoutstream.public, fmt, ap);
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funlockfile(stream);
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return n;
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}
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