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

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(). :^)

1 files changed, 7 insertions, 0 deletions

diff --git a/Kernel/Process.h b/Kernel/Process.h
index 90b0fc9108..9ade3ef64b 100644
--- a/Kernel/Process.h
+++ b/Kernel/Process.h
@@ -18,6 +18,7 @@ class FileDescriptor;
 class PageDirectory;
 class Region;
 class VMObject;
+class ProcessTracer;
 
 void kgettimeofday(timeval&);
 
@@ -175,6 +176,7 @@ public:
     int sys$restore_signal_mask(dword mask);
     int sys$create_thread(int(*)(void*), void*);
     int sys$rename(const char* oldpath, const char* newpath);
+    int sys$systrace(pid_t);
 
     int sys$create_shared_buffer(pid_t peer_pid, int, void** buffer);
     void* sys$get_shared_buffer(int shared_buffer_id);
@@ -194,6 +196,9 @@ public:
     const Vector<Retained<Region>>& regions() const { return m_regions; }
     void dump_regions();
 
+    ProcessTracer* tracer() { return m_tracer.ptr(); }
+    ProcessTracer& ensure_tracer();
+
     dword m_ticks_in_user { 0 };
     dword m_ticks_in_kernel { 0 };
 
@@ -318,6 +323,8 @@ private:
 
     unsigned m_syscall_count { 0 };
 
+    RetainPtr<ProcessTracer> m_tracer;
+
     Lock m_big_lock;
 };