Halt perfparser when PERFPARSER_DEBUG_WAIT is set

This gives a developer the chance to attach a debugger.

Change-Id: I80ca1246e06727f511a326ab87a7fc32c8462fd2
Reviewed-by: Milian Wolff <milian.wolff@kdab.com>

1 files changed, 14 insertions, 1 deletions

diff --git a/app/main.cpp b/app/main.cpp
index 5eba3db..4d216e5 100644
--- a/app/main.cpp
+++ b/app/main.cpp
@@ -39,7 +39,10 @@
 #include <QtEndian>
 
 #include <cstring>
-#include <limits>
+
+#ifdef Q_OS_LINUX
+#include <signal.h>
+#endif
 
 #ifdef Q_OS_WIN
 #include <io.h>
@@ -79,6 +82,16 @@ int main(int argc, char *argv[])
     app.setApplicationName(QLatin1String("perfparser"));
     app.setApplicationVersion(QLatin1String("4.9"));
 
+    if (qEnvironmentVariableIsSet("PERFPARSER_DEBUG_WAIT")) {
+#ifdef Q_OS_LINUX
+        qWarning("PERFPARSER_DEBUG_WAIT is set, halting perfparser.");
+        qWarning("Continue with \"kill -SIGCONT %lld\" or by attaching a debugger.", app.applicationPid());
+        kill(app.applicationPid(), SIGSTOP);
+#else
+        qWarning("PERFPARSER_DEBUG_WAIT is set, but this only works on linux. Ignoring.");
+#endif
+    }
+
     QCommandLineParser parser;
     parser.setApplicationDescription(QLatin1String("Perf data parser and unwinder."));
     parser.addHelpOption();