diff options
Diffstat (limited to 'nuttx/drivers/dev_null.c')
-rw-r--r-- | nuttx/drivers/dev_null.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/nuttx/drivers/dev_null.c b/nuttx/drivers/dev_null.c new file mode 100644 index 000000000..f4211b513 --- /dev/null +++ b/nuttx/drivers/dev_null.c @@ -0,0 +1,89 @@ +/************************************************************ + * 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 <sys/types.h> +#include <string.h> +#include <errno.h> +#include <nuttx/fs.h> + +/************************************************************ + * Private Function Prototypes + ************************************************************/ + +static ssize_t devnull_read(struct file *, char *, size_t); +static ssize_t devnull_write(struct file *, const char *, size_t); + +/************************************************************ + * Private Data + ************************************************************/ + +static struct file_operations devnull_fops = +{ + .read = devnull_read, + .write = devnull_write, +}; + +/************************************************************ + * Private Functions + ************************************************************/ + +static ssize_t devnull_read(struct file *filp, char *buffer, size_t len) +{ + return 0; /* Return EOF */ +} + +static ssize_t devnull_write(struct file *filp, const char *buffer, size_t len) +{ + return len; /* Say that everything was written */ +} + +/************************************************************ + * Public Functions + ************************************************************/ + +void devnull_register(void) +{ + (void)register_inode("/dev/null", &devnull_fops, 0666, NULL); +} |