TeamDebugger: Implement post syscall event handling.

We now watch for file write syscalls in the target team. If they
constitute a write to either stdout or stderr, we attempt to capture the
output, and notify interested listeners accordingly.

src/apps/debugger/Jamfile

@@ -4,6 +4,10 @@ CCFLAGS +=  -Werror ;
 C++FLAGS += -Werror ;
 
 UseHeaders [ FDirName $(HAIKU_TOP) headers compatibility bsd ] : true ;
+
+# for syscall_numbers.h
+UseHeaders [ FDirName $(HAIKU_COMMON_DEBUG_OBJECT_DIR) system kernel ] ;
+
 UsePrivateHeaders app debug interface kernel shared libroot ;
 UsePrivateSystemHeaders ;
 
@@ -58,6 +62,11 @@ SourceHdrs
 	: [ FDirName $(SUBDIR) dwarf ]
 ;
 
+# since syscall_numbers.h is generated on the fly, we need to explicitly
+# let Jam know about the dependency.
+Includes [ FGristFiles TeamDebugger.cpp ]
+	: <syscalls>syscall_numbers.h ;
+
 Application Debugger :
 	Debugger.cpp
 

src/apps/debugger/controllers/TeamDebugger.cpp

@@ -18,6 +18,7 @@
 #include <AutoLocker.h>
 
 #include "debug_utils.h"
+#include "syscall_numbers.h"
 
 #include "BreakpointManager.h"
 #include "BreakpointSetting.h"
@@ -1261,8 +1262,16 @@ TeamDebugger::_HandleDebuggerMessage(DebugEvent* event)
 			handled = _HandleImageDeleted(imageEvent);
 			break;
 		}
-		case B_DEBUGGER_MESSAGE_PRE_SYSCALL:
 		case B_DEBUGGER_MESSAGE_POST_SYSCALL:
+		{
+			PostSyscallEvent* postSyscallEvent
+				= dynamic_cast<PostSyscallEvent*>(event);
+			TRACE_EVENTS("B_DEBUGGER_MESSAGE_POST_SYSCALL: syscall: %"
+				B_PRIu32 "\n", postSyscallEvent->GetSyscallInfo().Syscall());
+			handled = _HandlePostSyscall(postSyscallEvent);
+			break;
+		}
+		case B_DEBUGGER_MESSAGE_PRE_SYSCALL:
 		case B_DEBUGGER_MESSAGE_SIGNAL_RECEIVED:
 		case B_DEBUGGER_MESSAGE_PROFILER_UPDATE:
 		case B_DEBUGGER_MESSAGE_HANDED_OVER:
@@ -1402,6 +1411,37 @@ TeamDebugger::_HandleImageDeleted(ImageDeletedEvent* event)
 }
 
 
+bool
+TeamDebugger::_HandlePostSyscall(PostSyscallEvent* event)
+{
+	const SyscallInfo& info = event->GetSyscallInfo();
+	const uint32* args = info.Arguments();
+
+	switch (info.Syscall()) {
+		case SYSCALL_WRITE:
+		{
+			int32 fd = (int32)args[0];
+			if (fd == 1 || fd == 2) {
+				BString data;
+				ssize_t result = fDebuggerInterface->ReadMemoryString(
+					(target_addr_t)args[3], (size_t)args[4], data);
+				if (result >= 0)
+					fTeam->NotifyConsoleOutputReceived(fd, data);
+			}
+			break;
+		}
+		case SYSCALL_WRITEV:
+		{
+			// TODO: handle
+		}
+		default:
+			break;
+	}
+
+	return false;
+}
+
+
 void
 TeamDebugger::_HandleImageDebugInfoChanged(image_id imageID)
 {

src/apps/debugger/controllers/TeamDebugger.h

@@ -141,6 +141,8 @@ private:
 									ImageCreatedEvent* event);
 			bool				_HandleImageDeleted(
 									ImageDeletedEvent* event);
+			bool				_HandlePostSyscall(
+									PostSyscallEvent* event);
 
 			void				_HandleImageDebugInfoChanged(image_id imageID);
 			void				_HandleImageFileChanged(image_id imageID);