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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2008-02-01 22:19:20 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2008-02-01 22:19:20 +0000 |
commit | 51f96a502ea130e3d83eff679b560608a8246a75 (patch) | |
tree | e369db19378fc1244ded2d76e0c5e86765305eeb /nuttx/drivers/dev_zero.c | |
parent | 5551ed84bf3a90972b46c67808d8ed24e6ca07d8 (diff) | |
download | px4-nuttx-51f96a502ea130e3d83eff679b560608a8246a75.tar.gz px4-nuttx-51f96a502ea130e3d83eff679b560608a8246a75.tar.bz2 px4-nuttx-51f96a502ea130e3d83eff679b560608a8246a75.zip |
Added lseek()
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@612 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/drivers/dev_zero.c')
-rw-r--r-- | nuttx/drivers/dev_zero.c | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/nuttx/drivers/dev_zero.c b/nuttx/drivers/dev_zero.c new file mode 100644 index 000000000..7116758b4 --- /dev/null +++ b/nuttx/drivers/dev_zero.c @@ -0,0 +1,94 @@ +/**************************************************************************** + * drivers/dev_null.c + * + * Copyright (C) 2008 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 NuttX 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 <sys/types.h> +#include <string.h> +#include <errno.h> +#include <nuttx/fs.h> + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +static ssize_t devzero_read(struct file *, char *, size_t); +static ssize_t devzero_write(struct file *, const char *, size_t); + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +static struct file_operations devzero_fops = +{ + 0, /* open */ + 0, /* close */ + devzero_read, /* read */ + devzero_write, /* write */ + 0, /* seek */ + 0 /* ioctl */ +}; + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +static ssize_t devzero_read(struct file *filp, char *buffer, size_t len) +{ + return 0; /* Return EOF */ +} + +static ssize_t devzero_write(struct file *filp, const char *buffer, size_t len) +{ + memset(buffer, 0, len); + return len; +} + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +void devzero_register(void) +{ + (void)register_driver("/dev/zero", &devzero_fops, 0666, NULL); +} |