diff --git a/src/engine/linux/debug.cpp b/src/engine/linux/debug.cpp
index 009299a61..78bbeabf2 100644
--- a/src/engine/linux/debug.cpp
+++ b/src/engine/linux/debug.cpp
@@ -19,7 +19,7 @@ namespace Debug
 
 void debugOutput(const char* message)
 {
-	puts(message);
+	printf("%s", message);
 }
 
 
diff --git a/src/engine/linux/fibers.cpp b/src/engine/linux/fibers.cpp
index 71a5f6908..7618f5178 100644
--- a/src/engine/linux/fibers.cpp
+++ b/src/engine/linux/fibers.cpp
@@ -1,5 +1,6 @@
 #include "engine/fibers.h"
 #include "engine/lumix.h"
+#include "engine/profiler.h"
 #include <ucontext.h>
 #include <stdlib.h>
 #include <string.h>
@@ -48,6 +49,7 @@ void destroy(Handle fiber)
 
 void switchTo(Handle* prev, Handle fiber)
 {
+	Profiler::beforeFiberSwitch();
 	swapcontext(prev, &fiber); 
 }
 
diff --git a/src/engine/linux/os.cpp b/src/engine/linux/os.cpp
index e0888537d..a3109c30c 100644
--- a/src/engine/linux/os.cpp
+++ b/src/engine/linux/os.cpp
@@ -278,7 +278,7 @@ static void processEvents()
 
 void destroyWindow(WindowHandle window)
 {
-	ASSERT(false);
+	//ASSERT(false);
     // TODO
 }
 
@@ -661,9 +661,22 @@ void unclipCursor()
 
 bool copyFile(const char* from, const char* to)
 {
-	////ASSERT(false);
-    // TODO
-	return {};
+    const int source = open(from, O_RDONLY, 0);
+	if (source < 0) return false;
+    const int dest = open(to, O_WRONLY | O_CREAT, 0644);
+	if (dest < 1) {
+		close(source);
+		return false;
+	}
+
+	char buf[BUFSIZ];
+    size_t size;
+    while ((size = read(source, buf, BUFSIZ)) > 0) {
+        write(dest, buf, size);
+    }
+
+    close(source);
+    close(dest);
 }