Log maxfiles to file and stderr on *NIX

rpcs3/rpcs3qt/gui_application.cpp

@@ -35,6 +35,7 @@
 #include <QDirIterator>
 #include <QFileInfo>
 #include <QSound>
+#include <QMessageBox>
 
 #include <clocale>
 
@@ -105,6 +106,17 @@ bool gui_application::Init()
 		welcome->exec();
 	}
 
+	// Check maxfiles
+	if (utils::get_maxfiles() < 4096)
+	{
+		QMessageBox::warning(nullptr,
+							 tr("Warning"),
+							 tr("The current limit of maximum file descriptors is too low.\n"
+								"Some games will crash.\n"
+								"\n"
+								"Please increase the limit before running RPCS3."));
+	}
+
 	if (m_main_window && !m_main_window->Init(m_with_cli_boot))
 	{
 		return false;