From: Mikko Rasa <tdb@tdb.fi>
Date: Wed, 16 Mar 2022 10:10:40 +0000 (+0200)
Subject: Add utilities to interface with an attached debugger
X-Git-Url: http://git.tdb.fi/?p=libs%2Fcore.git;a=commitdiff_plain;h=b5c1bea5084768c7382c376383032c1a6ea16803

Add utilities to interface with an attached debugger
---

diff --git a/source/debug/debugapi.cpp b/source/debug/debugapi.cpp
new file mode 100644
index 0000000..8fafdd9
--- /dev/null
+++ b/source/debug/debugapi.cpp
@@ -0,0 +1,59 @@
+#ifndef _WIN32
+#include <signal.h>
+#endif
+#include <msp/fs/utils.h>
+#include <msp/io/file.h>
+#include <msp/strings/format.h>
+#include <msp/strings/utils.h>
+#include "debugapi.h"
+
+using namespace std;
+
+namespace Msp {
+namespace Debug {
+
+DebuggerType check_debugger(bool force_recheck)
+{
+	static DebuggerType debugger = NONE;
+	static bool checked = false;
+
+	if(!checked || force_recheck)
+	{
+		checked = true;
+
+#ifndef _WIN32
+		unsigned tracer_pid = 0;
+		IO::BufferedFile status("/proc/self/status");
+		string line;
+		while(status.getline(line))
+			if(!line.compare(0, 10, "TracerPid:"))
+			{
+				tracer_pid = lexical_cast<unsigned>(strip(line.substr(10)));
+				break;
+			}
+
+		if(tracer_pid)
+		{
+			FS::Path tracer_cmd = FS::readlink(format("/proc/%d/exe", tracer_pid));
+			if(FS::basename(tracer_cmd)=="gdb")
+				debugger = GDB;
+			else
+				debugger = UNKNOWN;
+		}
+#endif
+	}
+
+	return debugger;
+}
+
+void debug_break()
+{
+#ifdef _WIN32
+	__debugbreak();
+#else
+	raise(SIGTRAP);
+#endif
+}
+
+} // namespace Debug
+} // namespace Msp
diff --git a/source/debug/debugapi.h b/source/debug/debugapi.h
new file mode 100644
index 0000000..80dcc4c
--- /dev/null
+++ b/source/debug/debugapi.h
@@ -0,0 +1,20 @@
+#ifndef MSP_DEBUG_DEBUGAPI_H_
+#define MSP_DEBUG_DEBUGAPI_H_
+
+namespace Msp {
+namespace Debug {
+
+enum DebuggerType
+{
+	NONE,
+	GDB,
+	UNKNOWN,
+};
+
+DebuggerType check_debugger(bool = false);
+void debug_break();
+
+} // namespace Debug
+} // namespace Msp
+
+#endif