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Expose the kernel log buffer through /proc/dmesg.

Also add a /bin/dmesg program for convenience.
This commit is contained in:
Andreas Kling 2019-01-28 22:40:55 +01:00
parent 442351a5f8
commit 7455f5ea42
8 changed files with 77 additions and 0 deletions

View file

@ -52,6 +52,7 @@ void Console::put_char(char ch)
//if (ch != 27)
IO::out8(0xe9, ch);
#endif
m_logbuffer.enqueue(ch);
if (m_implementation)
m_implementation->on_sysconsole_receive(ch);
}

View file

@ -1,5 +1,6 @@
#pragma once
#include <AK/CircularQueue.h>
#include <AK/Compiler.h>
#include <AK/Vector.h>
#include <Kernel/CharacterDevice.h>
@ -29,7 +30,10 @@ public:
void put_char(char);
const CircularQueue<char, 16384>& logbuffer() const { return m_logbuffer; }
private:
ConsoleImplementation* m_implementation { nullptr };
CircularQueue<char, 16384> m_logbuffer;
};

View file

@ -6,6 +6,7 @@
#include "StdLib.h"
#include "i386.h"
#include "KSyms.h"
#include "Console.h"
#include <AK/StringBuilder.h>
static ProcFS* s_the;
@ -198,6 +199,15 @@ ByteBuffer procfs$mm(SynthFSInode&)
return builder.to_byte_buffer();
}
ByteBuffer procfs$dmesg(SynthFSInode&)
{
InterruptDisabler disabler;
StringBuilder builder;
for (char ch : Console::the().logbuffer())
builder.append(ch);
return builder.to_byte_buffer();
}
ByteBuffer procfs$mounts(SynthFSInode&)
{
InterruptDisabler disabler;
@ -386,6 +396,7 @@ bool ProcFS::initialize()
add_file(create_generated_file("summary", procfs$summary));
add_file(create_generated_file("cpuinfo", procfs$cpuinfo));
add_file(create_generated_file("inodes", procfs$inodes));
add_file(create_generated_file("dmesg", procfs$dmesg));
m_sys_dir = add_file(create_directory("sys"));
return true;
}

View file

@ -49,6 +49,7 @@ cp -v ../Userland/guitest mnt/bin/guitest
cp -v ../Userland/guitest2 mnt/bin/guitest2
cp -v ../Userland/sysctl mnt/bin/sysctl
cp -v ../Terminal/Terminal mnt/bin/Terminal
cp -v ../Userland/dmesg mnt/bin/dmesg
sh sync-local.sh
cp -v kernel.map mnt/
ln -s dir_a mnt/dir_cur