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92 lines
3.1 KiB
92 lines
3.1 KiB
/**************************************************************************** |
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* examples/ostest/dev_null.c |
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* |
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* Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org> |
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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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* |
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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 |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* 3. Neither the name NuttX nor the names of its contributors may be |
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* used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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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 <unistd.h> |
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#include <fcntl.h> |
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#include "ostest.h" |
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/**************************************************************************** |
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* Private Data |
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****************************************************************************/ |
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#if CONFIG_NFILE_DESCRIPTORS > 0 |
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static FAR char buffer[1024]; |
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/**************************************************************************** |
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* Public Functions |
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****************************************************************************/ |
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int dev_null(void) |
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{ |
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int nbytes; |
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int fd; |
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fd = open("/dev/null", O_RDWR); |
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if (fd < 0) |
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{ |
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printf("dev_null: ERROR Failed to open /dev/null\n"); |
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return -1; |
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} |
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nbytes = read(fd, buffer, 1024); |
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if (nbytes < 0) |
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{ |
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printf("dev_null: ERROR Failed to read from /dev/null\n"); |
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close(fd); |
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return -1; |
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} |
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printf("dev_null: Read %d bytes from /dev/null\n", nbytes); |
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nbytes = write(fd, buffer, 1024); |
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if (nbytes < 0) |
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{ |
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printf("dev_null: ERROR Failed to write to /dev/null\n"); |
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close(fd); |
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return -1; |
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} |
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printf("dev_null: Wrote %d bytes to /dev/null\n", nbytes); |
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close(fd); |
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return 0; |
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} |
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#endif /*CONFIG_NFILE_DESCRIPTORS */
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