diff --git a/Makefile b/Makefile
index 20029ee..0f7d50c 100644
--- a/Makefile
+++ b/Makefile
@@ -12,7 +12,7 @@ release:
 	GOOS=windows GOARCH=386 go build -o tun2socks_windows_32.exe cmd/main.go
 
 shared:
-	go build -buildmode=c-shared -o libtun2socks.so ./cmd
+	go build -buildmode=c-shared -o libtun2socks.so ./cmd/main.go
 
 static:
-	go build -buildmode=c-archive -o libtun2socks.a ./cmd
+	go build -buildmode=c-archive -o libtun2socks.a ./cmd/main.go
diff --git a/cmd/main.c b/cmd/shared/main.c
similarity index 53%
rename from cmd/main.c
rename to cmd/shared/main.c
index c49c4da..651bd00 100644
--- a/cmd/main.c
+++ b/cmd/shared/main.c
@@ -1,11 +1,18 @@
 #include <stdio.h>
+#include <stdint.h>
+#include <string.h>
 #include "libtun2socks.h"
 
 // osx:   gcc -o tun2socks main.c libtun2socks.a -framework CoreFoundation -framework Security -lpthread
 // linux: gcc -o tun2socks main.c libtun2socks.a -pthread
 // linux: gcc -o tun2socks main.c ./libtun2socks.so
-int main() {
-  GoString configFile = {(char*)"/home/yy/dev/go/src/github.com/FlowerWrong/tun2socks/config.example.ini", 71};
+int main(int argc, char *argv[]) {
+  if (argc != 2) {
+    printf("Usage: sudo ./tun2socks config.ini\n");
+    return 0;
+  }
+  char * configPath = argv[1];
+  GoString configFile = {configPath, (int64_t)strlen(configPath)};
   RunTun2socks(configFile);
   return 0;
 }