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Add the basic character devices to kernel.

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This commit is contained in:
Andreas Kling 2018-10-16 14:33:16 +02:00
parent 12e515735b
commit aec8ab0a60
13 changed files with 52 additions and 58 deletions
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5
VirtualFileSystem/FullDevice.cpp
View file

@ -2,8 +2,7 @@
#include "Limits.h"
#include "sys-errno.h"
#include <AK/StdLib.h>
#include <cstring>
#include <cstdio>
#include <AK/kstdio.h>
FullDevice::FullDevice()
{
@ -15,7 +14,7 @@ FullDevice::~FullDevice()
Unix::ssize_t FullDevice::read(byte* buffer, Unix::size_t bufferSize)
{
printf("read from full device\n");
kprintf("FullDevice: read from full\n");
Unix::size_t count = min(GoodBufferSize, bufferSize);
memset(buffer, 0, count);
return count;

9
VirtualFileSystem/Limits.h
View file

@ -1,9 +1,14 @@
#pragma once
#include <limits>
#include "UnixTypes.h"
#ifdef SERENITY_KERNEL
inline static const Unix::off_t maxFileOffset = 9223372036854775807LL;
#else
#include <limits>
inline static const Unix::off_t maxFileOffset = std::numeric_limits<Unix::off_t>::max();
#endif
static const Unix::size_t GoodBufferSize = 4096;
inline static const Unix::off_t maxFileOffset = std::numeric_limits<Unix::off_t>::max();

5
VirtualFileSystem/NullDevice.cpp
View file

@ -1,8 +1,7 @@
#include "NullDevice.h"
#include "Limits.h"
#include <AK/StdLib.h>
#include <cstring>
#include <cstdio>
#include <AK/kstdio.h>
NullDevice::NullDevice()
{
@ -14,7 +13,7 @@ NullDevice::~NullDevice()
Unix::ssize_t NullDevice::read(byte*, Unix::size_t)
{
printf("read from null\n");
kprintf("NullDevice: read from null\n");
return 0;
}

4
VirtualFileSystem/RandomDevice.cpp
View file

@ -1,8 +1,6 @@
#include "RandomDevice.h"
#include "Limits.h"
#include <AK/StdLib.h>
#include <cstring>
#include <cstdio>
RandomDevice::RandomDevice()
{
@ -23,10 +21,12 @@ static int myrand()
return((unsigned)(next/((MY_RAND_MAX + 1) * 2)) % (MY_RAND_MAX + 1));
}
#if 0
static void mysrand(unsigned seed)
{
next = seed;
}
#endif
Unix::ssize_t RandomDevice::read(byte* buffer, Unix::size_t bufferSize)
{

5
VirtualFileSystem/ZeroDevice.cpp
View file

@ -1,8 +1,7 @@
#include "ZeroDevice.h"
#include "Limits.h"
#include <AK/StdLib.h>
#include <cstring>
#include <cstdio>
#include <AK/kstdio.h>
ZeroDevice::ZeroDevice()
{
@ -14,7 +13,7 @@ ZeroDevice::~ZeroDevice()
Unix::ssize_t ZeroDevice::read(byte* buffer, Unix::size_t bufferSize)
{
printf("read from zero device\n");
kprintf("ZeroDevice: read from zero\n");
Unix::size_t count = min(GoodBufferSize, bufferSize);
memset(buffer, 0, count);
return count;