ladybird/Kernel/ProcessTracer.h
Andreas Kling 1b2ef8582c Kernel: Make File's can_read/can_write take a const FileDescription&
Asking a File if we could possibly read or write it will never mutate
the asking FileDescription&, so it should be const.
2019-11-04 14:03:14 +01:00

42 lines
1.2 KiB
C++

#pragma once
#include <AK/CircularQueue.h>
#include <Kernel/FileSystem/File.h>
#include <Kernel/UnixTypes.h>
class ProcessTracer : public File {
public:
static NonnullRefPtr<ProcessTracer> create(pid_t pid) { return adopt(*new ProcessTracer(pid)); }
virtual ~ProcessTracer() override;
bool is_dead() const { return m_dead; }
void set_dead() { m_dead = true; }
virtual bool can_read(const FileDescription&) const override { return !m_calls.is_empty() || m_dead; }
virtual int read(FileDescription&, u8*, int) override;
virtual bool can_write(const FileDescription&) const override { return true; }
virtual int write(FileDescription&, const u8*, int) override { return -EIO; }
virtual String absolute_path(const FileDescription&) const override;
void did_syscall(u32 function, u32 arg1, u32 arg2, u32 arg3, u32 result);
pid_t pid() const { return m_pid; }
private:
virtual const char* class_name() const override { return "ProcessTracer"; }
explicit ProcessTracer(pid_t);
struct CallData {
u32 function;
u32 arg1;
u32 arg2;
u32 arg3;
u32 result;
};
pid_t m_pid;
bool m_dead { false };
CircularQueue<CallData, 200> m_calls;
};