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Devices: Add /dev/uptime

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This file contains how many milliseconds have passed since boot at the time of reading it :)
This commit is contained in:
apio 2022-10-19 21:11:12 +02:00
parent 1938a059a2
commit 47bdfecedb
3 changed files with 35 additions and 0 deletions
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9
kernel/include/fs/devices/Uptime.h Normal file
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@ -0,0 +1,9 @@
#pragma once
#include "fs/VFS.h"
namespace UptimeDevice
{
VFS::Node* create_new(const char* devname);
ssize_t read(VFS::Node* node, size_t offset, size_t size, char* buffer);
}

2
kernel/src/fs/devices/DeviceFS.cpp
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@ -3,6 +3,7 @@
#include "fs/devices/Keyboard.h"
#include "fs/devices/Random.h"
#include "fs/devices/Serial.h"
#include "fs/devices/Uptime.h"
#include "fs/devices/Version.h"
#include "std/stdlib.h"
#include "std/string.h"
@ -29,6 +30,7 @@ VFS::Node* DeviceFS::get()
devfs_files[devfs_file_count++] = SerialDevice::create_new("serial");
devfs_files[devfs_file_count++] = RandomDevice::create_new("random");
devfs_files[devfs_file_count++] = KeyboardDevice::create_new("kbd");
devfs_files[devfs_file_count++] = UptimeDevice::create_new("uptime");
return devfs_root;
}

24
kernel/src/fs/devices/Uptime.cpp Normal file
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@ -0,0 +1,24 @@
#include "fs/devices/Uptime.h"
#include "std/stdio.h"
#include "std/stdlib.h"
#include "std/string.h"
#include "thread/PIT.h"
VFS::Node* UptimeDevice::create_new(const char* devname)
{
VFS::Node* dev = new VFS::Node;
dev->read_func = UptimeDevice::read;
dev->inode = 0;
dev->length = 0;
dev->type = VFS_DEVICE;
dev->flags = 0;
strncpy(dev->name, devname, sizeof(dev->name));
return dev;
}
ssize_t UptimeDevice::read(VFS::Node* node, size_t, size_t size, char* buffer)
{
if (!node) return -1;
snprintf(buffer, size + 1, "%ld", PIT::ms_since_boot); // FIXME: Support offseting this read
return (ssize_t)size;
}