toaruos/kernel/fs/nulldev.c
Kevin Lange eb92cccecd Cleanup
2013-03-15 00:52:09 -07:00

49 lines
1.2 KiB
C

/* vim: tabstop=4 shiftwidth=4 noexpandtab
* Null Device
*/
#include <system.h>
#include <fs.h>
uint32_t read_null(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer);
uint32_t write_null(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer);
void open_null(fs_node_t *node, uint8_t read, uint8_t write);
void close_null(fs_node_t *node);
uint32_t read_null(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
if (size < 1) {
return 0;
}
memset(buffer, 0x00, 1);
return 0;
}
uint32_t write_null(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
return size;
}
void open_null(fs_node_t * node, uint8_t read, uint8_t write) {
return;
}
void close_null(fs_node_t * node) {
return;
}
fs_node_t * null_device_create() {
fs_node_t * fnode = malloc(sizeof(fs_node_t));
memset(fnode, 0x00, sizeof(fs_node_t));
fnode->inode = 0;
strcpy(fnode->name, "null");
fnode->uid = 0;
fnode->gid = 0;
fnode->flags = FS_CHARDEVICE;
fnode->read = read_null;
fnode->write = write_null;
fnode->open = open_null;
fnode->close = close_null;
fnode->readdir = NULL;
fnode->finddir = NULL;
return fnode;
}