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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2007-02-17 23:21:28 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2007-02-17 23:21:28 +0000 |
commit | e3940eb2080711edac189cca3f642ee89dc215f2 (patch) | |
tree | 1c390958fae49e34dce698b175487e6d4681e540 /nuttx/examples/ostest/dev_null.c | |
parent | 2223612deb2cc6322992f8595b6d6f86fcb53ae1 (diff) | |
download | px4-nuttx-e3940eb2080711edac189cca3f642ee89dc215f2.tar.gz px4-nuttx-e3940eb2080711edac189cca3f642ee89dc215f2.tar.bz2 px4-nuttx-e3940eb2080711edac189cca3f642ee89dc215f2.zip |
NuttX RTOS
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/examples/ostest/dev_null.c')
-rw-r--r-- | nuttx/examples/ostest/dev_null.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/nuttx/examples/ostest/dev_null.c b/nuttx/examples/ostest/dev_null.c new file mode 100644 index 000000000..11d6056c8 --- /dev/null +++ b/nuttx/examples/ostest/dev_null.c @@ -0,0 +1,91 @@ +/************************************************************ + * dev_null.c + * + * Copyright (C) 2007 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name Gregory Nutt nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ************************************************************/ + +/************************************************************ + * Compilation Switches + ************************************************************/ + +/************************************************************ + * Included Files + ************************************************************/ + +#include <nuttx/config.h> +#include <stdio.h> +#include <nuttx/os_external.h> +#include "ostest.h" + +/************************************************************ + * Private Data + ************************************************************/ + +static char buffer[1024]; + +/************************************************************ + * Public Functions + ************************************************************/ + +int dev_null(void) +{ + int nbytes; + int fd; + + fd = open("/dev/null", O_RDWR); + if (fd < 0) + { + fprintf(stderr, "%s: Failed to open /dev/null\n", __FUNCTION__); + return -1; + } + + nbytes = read(fd, buffer, 1024); + if (nbytes < 0) + { + fprintf(stderr, "%s: Failed to read from /dev/null\n", __FUNCTION__); + close(fd); + return -1; + } + printf("%s: Read %d bytes from /dev/null\n", __FUNCTION__, nbytes); + + nbytes = write(fd, buffer, 1024); + if (nbytes < 0) + { + fprintf(stderr, "%s: Failed to write to /dev/null\n", __FUNCTION__); + close(fd); + return -1; + } + printf("%s: Wrote %d bytes to /dev/null\n", __FUNCTION__, nbytes); + + close(fd); + return 0; +} |