99 lines
2.5 KiB
C
99 lines
2.5 KiB
C
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/* vim: tabstop=4 shiftwidth=4 noexpandtab
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* Null Device
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*/
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#include <system.h>
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#include <fs.h>
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#include <module.h>
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static uint32_t read_null(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer);
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static uint32_t write_null(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer);
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static void open_null(fs_node_t *node, unsigned int flags);
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static void close_null(fs_node_t *node);
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static uint32_t read_zero(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer);
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static uint32_t write_zero(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer);
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static void open_zero(fs_node_t *node, unsigned int flags);
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static void close_zero(fs_node_t *node);
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static uint32_t read_null(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
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return 0;
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}
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static uint32_t write_null(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
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return 0;
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}
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static void open_null(fs_node_t * node, unsigned int flags) {
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return;
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}
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static void close_null(fs_node_t * node) {
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return;
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}
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static uint32_t read_zero(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
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memset(buffer, 0x00, size);
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return 1;
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}
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static uint32_t write_zero(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
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return 0;
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}
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static void open_zero(fs_node_t * node, unsigned int flags) {
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return;
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}
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static void close_zero(fs_node_t * node) {
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return;
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}
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static fs_node_t * null_device_create(void) {
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fs_node_t * fnode = malloc(sizeof(fs_node_t));
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memset(fnode, 0x00, sizeof(fs_node_t));
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fnode->inode = 0;
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strcpy(fnode->name, "null");
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fnode->uid = 0;
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fnode->gid = 0;
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fnode->flags = FS_CHARDEVICE;
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fnode->read = read_null;
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fnode->write = write_null;
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fnode->open = open_null;
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fnode->close = close_null;
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fnode->readdir = NULL;
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fnode->finddir = NULL;
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fnode->ioctl = NULL;
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return fnode;
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}
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static fs_node_t * zero_device_create(void) {
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fs_node_t * fnode = malloc(sizeof(fs_node_t));
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memset(fnode, 0x00, sizeof(fs_node_t));
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fnode->inode = 0;
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strcpy(fnode->name, "zero");
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fnode->uid = 0;
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fnode->gid = 0;
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fnode->flags = FS_CHARDEVICE;
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fnode->read = read_zero;
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fnode->write = write_zero;
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fnode->open = open_zero;
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fnode->close = close_zero;
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fnode->readdir = NULL;
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fnode->finddir = NULL;
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fnode->ioctl = NULL;
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return fnode;
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}
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static int zero_initialize(void) {
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vfs_mount("/dev/null", null_device_create());
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vfs_mount("/dev/zero", zero_device_create());
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return 0;
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}
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static int zero_finalize(void) {
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return 0;
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}
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MODULE_DEF(zero, zero_initialize, zero_finalize);
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