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Kernel: Add a systrace() syscall and implement /bin/strace using it.

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Calling systrace(pid) gives you a file descriptor with a stream of the
syscalls made by a peer process. The process must be owned by the same
UID who calls systrace(). :^)
This commit is contained in:
Andreas Kling 2019-04-22 18:44:45 +02:00
parent 6693cfb26a
commit 5c68929aa1
12 changed files with 188 additions and 1 deletions
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7
Kernel/FileSystem/FileDescriptor.h
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@ -14,6 +14,7 @@
class TTY;
class MasterPTY;
class Process;
class ProcessTracer;
class Region;
class CharacterDevice;
@ -24,6 +25,7 @@ public:
static Retained<FileDescriptor> create(RetainPtr<Inode>&&);
static Retained<FileDescriptor> create(RetainPtr<Device>&&);
static Retained<FileDescriptor> create(RetainPtr<SharedMemory>&&);
static Retained<FileDescriptor> create(RetainPtr<ProcessTracer>&&);
static Retained<FileDescriptor> create_pipe_writer(FIFO&);
static Retained<FileDescriptor> create_pipe_reader(FIFO&);
~FileDescriptor();
@ -101,11 +103,15 @@ public:
KResult truncate(off_t);
ProcessTracer* tracer() { return m_tracer.ptr(); }
const ProcessTracer* tracer() const { return m_tracer.ptr(); }
private:
friend class VFS;
FileDescriptor(RetainPtr<Socket>&&, SocketRole);
explicit FileDescriptor(RetainPtr<Inode>&&);
explicit FileDescriptor(RetainPtr<Device>&&);
explicit FileDescriptor(RetainPtr<ProcessTracer>&&);
explicit FileDescriptor(RetainPtr<SharedMemory>&&);
FileDescriptor(FIFO&, FIFO::Direction);
@ -126,6 +132,7 @@ private:
FIFO::Direction m_fifo_direction { FIFO::Neither };
RetainPtr<SharedMemory> m_shared_memory;
RetainPtr<ProcessTracer> m_tracer;
bool m_closed { false };
};