93 lines
2.1 KiB
C
93 lines
2.1 KiB
C
/**
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* @file kernel/vfs/zero.c
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* @brief /dev/null and /dev/zero provider.
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*
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* @copyright
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* This file is part of ToaruOS and is released under the terms
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* of the NCSA / University of Illinois License - see LICENSE.md
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* Copyright (C) 2014-2018 K. Lange
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*/
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#include <stdint.h>
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#include <stddef.h>
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#include <errno.h>
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#include <kernel/vfs.h>
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#include <kernel/string.h>
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static ssize_t read_null(fs_node_t *node, off_t offset, size_t size, uint8_t *buffer) {
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return 0;
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}
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static ssize_t write_null(fs_node_t *node, off_t offset, size_t size, uint8_t *buffer) {
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return size;
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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 ssize_t read_zero(fs_node_t *node, off_t offset, size_t size, uint8_t *buffer) {
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memset(buffer, 0x00, size);
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return size;
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}
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static ssize_t write_zero(fs_node_t *node, off_t offset, size_t size, uint8_t *buffer) {
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return size;
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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->mask = 0666;
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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->mask = 0666;
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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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void 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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}
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