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This example will help newcomers to port software from Linux to NuttX in a POSIX compliant fashion using stdio library. It shows how to work with open(), close() and write() functions over /dev/console. Signed-off-by: Vinicius May <vmay.sweden@gmail.com>
101 lines
3.2 KiB
C
101 lines
3.2 KiB
C
/****************************************************************************
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* apps/examples/posix_stdio/posix_stdio.c
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*
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* SPDX-License-Identifier: Apache-2.0
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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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* This is a single POSIX example that works for both Nuttx and Linux distros
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* (with minimal changes). By this example its possible to learn how to use
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* posix style and also works with onpen(), close() and write() functions.
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*
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* For linux, need to change the headers and the output device
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* A) Headers:
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* #include <fcntl.h>
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* #include <unistd.h>
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* #include <stdio.h>
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* #include <string.h>
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*
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* B) output:
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* /dev/tty
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*
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* To compile it on Linux, you can simple use gcc:
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* gcc posix_stdio.c -o posix_stdio
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*
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* To run, just send the following command: ./posix_stdio
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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 <stdint.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <stdio.h>
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/****************************************************************************
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* Pre-processor Definitions
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* *************************************************************************/
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/* define how many times the message will be printed in the console */
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#ifndef PRINT_N_TIMES
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# define PRINT_N_TIMES 10
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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static void print_message(int fd)
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{
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const char *message = "Hello, NuttX users, welcome!!!\n";
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write(fd, message, strlen(message));
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}
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/****************************************************************************
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* hello_nuttx_main
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****************************************************************************/
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int main(int argc, char *argv[])
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{
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int counter;
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int fd = open("/dev/console", O_WRONLY);
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if (fd < 0)
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{
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fprintf(stderr, "Failed to open console\n");
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return 1;
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}
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for (counter = 0; counter < PRINT_N_TIMES; counter++)
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{
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print_message(fd);
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}
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close(fd);
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return 0;
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}
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