LogStream: Prefix userspace dbg() output with "ProcessName(PID): "

Using the new get_process_name() syscall, we can automatically prefix
all userspace debug logging.

Hopefully this is more helpful than annoying. We'll find out! :^)

AK/LogStream.cpp

@@ -49,4 +49,25 @@ const LogStream& operator<<(const LogStream& stream, const TStyle& style)
     return stream;
 }
 
+#ifdef USERLAND
+static TriState got_process_name = TriState::Unknown;
+static char process_name_buffer[256];
+#endif
+
+DebugLogStream dbg()
+{
+    DebugLogStream stream;
+#ifdef USERLAND
+    if (got_process_name == TriState::Unknown) {
+        if (get_process_name(process_name_buffer, sizeof(process_name_buffer)) == 0)
+            got_process_name = TriState::True;
+        else
+            got_process_name = TriState::False;
+    }
+    if (got_process_name == TriState::True)
+        stream << TStyle(TStyle::Color::Brown, TStyle::Attribute::Bold) << process_name_buffer << '(' << getpid() << ")" << TStyle(TStyle::None) << ": ";
+#endif
+    return stream;
+}
+
 }

AK/LogStream.h

@@ -3,8 +3,10 @@
 #include <AK/kstdio.h>
 
 #ifdef USERLAND
-#include <AK/ScopedValueRollback.h>
-#include <errno.h>
+#    include <AK/ScopedValueRollback.h>
+#    include <AK/StringView.h>
+#    include <errno.h>
+#    include <unistd.h>
 #endif
 
 namespace AK {
@@ -14,8 +16,7 @@ class StringView;
 
 class TStyle {
 public:
-    enum NoneTag { DummyValue };
-    static NoneTag None;
+    enum NoneTag { None };
 
     enum Color {
         Black = 0,
@@ -98,11 +99,6 @@ public:
     }
 };
 
-inline DebugLogStream dbg()
-{
-    return {};
-}
-
 inline const LogStream& operator<<(const LogStream& stream, const char* value)
 {
     int length = 0;
@@ -131,6 +127,8 @@ inline const LogStream& operator<<(const LogStream& stream, bool value)
     return stream << (value ? "true" : "false");
 }
 
+DebugLogStream dbg();
+
 }
 
 using AK::dbg;