gfio: add gerror.c for reporting errors

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/gerror.c b/gerror.c
new file mode 100644
index 0000000..82e0dd2
--- /dev/null
+++ b/gerror.c
@@ -0,0 +1,60 @@
+#include <locale.h>
+#include <malloc.h>
+#include <string.h>
+#include <stdarg.h>
+
+#include <gtk/gtk.h>
+
+#include "gfio.h"
+#include "gerror.h"
+
+static void on_info_bar_response(GtkWidget *widget, gint response,
+                                 gpointer data)
+{
+	struct gui *ui = (struct gui *) data;
+
+	if (response == GTK_RESPONSE_OK) {
+		gtk_widget_destroy(widget);
+		ui->error_info_bar = NULL;
+	}
+}
+
+static void report_error(struct gui_entry *ge, GError *error)
+{
+	struct gui *ui = ge->ui;
+
+	if (ui->error_info_bar == NULL) {
+		ui->error_info_bar = gtk_info_bar_new_with_buttons(GTK_STOCK_OK,
+		                                               GTK_RESPONSE_OK,
+		                                               NULL);
+		g_signal_connect(ui->error_info_bar, "response", G_CALLBACK(on_info_bar_response), ui);
+		gtk_info_bar_set_message_type(GTK_INFO_BAR(ui->error_info_bar),
+		                              GTK_MESSAGE_ERROR);
+		
+		ui->error_label = gtk_label_new(error->message);
+		GtkWidget *container = gtk_info_bar_get_content_area(GTK_INFO_BAR(ui->error_info_bar));
+		gtk_container_add(GTK_CONTAINER(container), ui->error_label);
+		
+		gtk_box_pack_start(GTK_BOX(ui->vbox), ui->error_info_bar, FALSE, FALSE, 0);
+		gtk_widget_show_all(ui->vbox);
+	} else {
+		char buffer[256];
+		snprintf(buffer, sizeof(buffer), "Failed to open file.");
+		gtk_label_set(GTK_LABEL(ui->error_label), buffer);
+	}
+}
+
+void gfio_report_error(struct gui_entry *ge, const char *format, ...)
+{
+	va_list args;
+	GError *error;
+
+	va_start(args, format);
+	error = g_error_new_valist(g_quark_from_string("fio"), 1, format, args);
+	va_end(args);
+
+	report_error(ge, error);
+	g_error_free(error);
+}
+
+