52 lines
1.8 KiB
C
52 lines
1.8 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* inbyte.c -- inbyte function for remoteproc
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*
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* Copyright (c) 2018-2019 Dimitar Dimitrov <dimitar@dinux.eu>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <errno.h>
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#include <_ansi.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "glue.h"
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extern ssize_t _read(int fd, void *b, size_t count);
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int
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inbyte (void)
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{
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ssize_t n;
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char c;
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/* PRU has no interrupts, so it is inherently thread-safe. */
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n = _read(STDIN_FILENO, &c, 1);
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if (n < 0)
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return n;
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else if (n == 0)
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return -ENODATA;
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else
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return 1;
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}
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