diff --git a/.gitmodules b/.gitmodules
index b358abe..85ae4dc 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "proto"]
 	path = proto
 	url = https://git.sch9.ru/new_gate/contracts
+[submodule "languages"]
+	path = languages
+	url = https://git.sch9.ru/new_gate/languages
diff --git a/languages b/languages
new file mode 160000
index 0000000..8a7e22c
--- /dev/null
+++ b/languages
@@ -0,0 +1 @@
+Subproject commit 8a7e22c121766e865752f492af978f7225b2a95a
diff --git a/main.go b/main.go
index cfba019..237f0a2 100644
--- a/main.go
+++ b/main.go
@@ -2,7 +2,6 @@ package main
 
 import (
     runner "git.sch9.ru/new_gate/ms-runner/runner"
-    "fmt"
 )
 
 func main() {
@@ -10,8 +9,4 @@ func main() {
     if(err != nil) {
         panic(err)
     }
-    fmt.Println(runnerService)
-    runnerService.Build([]string{},"");
-    //limits := runner.Limits{Core: 3,Memory: 10000000, Time: 1000}
-    //runner.IsolatedRun([]string{"/bin/echo", "123"}, limits)
 }
diff --git a/runner/runner.go b/runner/runner.go
index aecea30..daf957d 100644
--- a/runner/runner.go
+++ b/runner/runner.go
@@ -1,7 +1,6 @@
 package runner
 
 import (
-    "bytes"
     "io"
     "fmt"
     "log"
@@ -11,6 +10,7 @@ import (
     cgroups "github.com/containerd/cgroups"
     rand "math/rand"
     "time"
+    "git.sch9.ru/new_gate/ms-runner/languages"
 )
 
 const runIdLength = 20
@@ -43,7 +43,6 @@ func int32ToString(n int32) string {
 }
 
 func copyFile(src string,dst string) error {
-    log.Println(src,dst)
     srcFile,err := os.Open(src)
     if(err!=nil) {return err}
     defer srcFile.Close()
@@ -115,15 +114,15 @@ func NewRunnerService() (*RunnerService, error) {
     return &runnerService,nil
 }
 
-func (runnerService RunnerService) Build(buildCmd []string, filename string) {
+func (runnerService RunnerService) Build(languageId int32, filename string) {
     core := <-runnerService.CoreFreed
     runId := genRunId()
     err := os.Mkdir("runs/" + runId, 0777)
     if(err!=nil) { log.Fatal(err) }
     os.Chmod("runs/" + runId, 0777)
-    copyFile("starter/shared/main.c","runs/"+runId+"/main.c")//FIXME add source and file extension
-    runnerService.IsolatedRun([]string{"/usr/bin/gcc","/shared/main.c","-o","/shared/executable","-save-temps=obj"},"../runs/"+runId,Limits{Processes: 10,Core:core,Memory:BuildMemory,Time:BuildTime});
-    copyFile("runs/"+runId+"/executable","destination")//FIXME add destination
+    copyFile(filename,"runs/"+runId+"/src")
+    runnerService.IsolatedRun(languages.Languages[languageId].CompileCmd,"../runs/"+runId,Limits{Processes: 10,Core:core,Memory:BuildMemory,Time:BuildTime});
+    copyFile("runs/"+runId+"/executable","executable")
     os.RemoveAll("runs/" + runId)
     go func() {
         runnerService.CoreFreed <- core
@@ -133,17 +132,10 @@ func (runnerService RunnerService) Build(buildCmd []string, filename string) {
 func (runnerService RunnerService) IsolatedRun(command []string, sharedFolder string, limits Limits) {
     args := []string{int32ToString(limits.Processes),int32ToString(limits.Core), int32ToString(limits.Memory), int32ToString(limits.Time), sharedFolder}
     args = append(args, command...)
-    log.Println(limits.Processes)
-    log.Println(string(limits.Processes))
-    log.Println(args)
+    log.Println("running isolated process with command:",args)
     cmd := exec.Command("starter/starter", args...)
-    var stdBuffer bytes.Buffer
-    mw := io.MultiWriter(os.Stdout, &stdBuffer)
-    cmd.Stdout = mw
     err := cmd.Run();
     if err != nil {
-        log.Println(123)
         log.Println(err)
     }
-    //cmd.Wait()
 }
diff --git a/starter/ns_exec.c b/starter/ns_exec.c
index 3e673bd..8503837 100644
--- a/starter/ns_exec.c
+++ b/starter/ns_exec.c
@@ -11,16 +11,10 @@ static void procfs_prepare()
 #define hostname "runner"
 
 #define put_old "oldfs"
-//#define shared_folder "../shared"
-//#define shared_mountpoint "shared"
 void mnt_prepare(char* rootfs, char* shared_mountpoint) {
-    //char* shared_folder = malloc(strlen(shared_mountpoint)+4);
-    //strcpy(shared_folder,"../");
-    //strcat(shared_folder,shared_mountpoint);
     char* shared_folder=NULL;
     asprintf(&shared_folder,"../%s",shared_mountpoint);
     if (mount(rootfs,rootfs,"ext4",MS_BIND,""))                                     die("failed to mount %s: %m", rootfs);
-    //if (mount(shared_mountpoint,shared_mountpoint,"ext4",MS_BIND,""))             die("failed to mount %s: %m",shared_mountpoint);
     if (chdir(rootfs))                                                              die("falied to cd:%m");
     //if (mount("/sys","sys","sysfs",0,""))                                         die("failed to mount sysfs: %m");
     //if (mount("/dev","dev","udev",0,""))                                          die("failed to mount: %m");
@@ -58,15 +52,15 @@ static int nsrun(void* arg) {
     await_setup(params->fd[0]);
     char cwd[PATH_MAX];
     if(getcwd(cwd,sizeof(cwd))==NULL) die("getcwd error: %m");
-    if(chdir(params->shared_folder)) die("failed to chdir: %m");
+    if(chdir(params->shared_folder)) die("failed to chdir to shared folder: %m")
     int out_fd=open("out",O_WRONLY|O_CREAT,0666);
-    if(out_fd==-1) die("unable to open output file:%m");
+    if(out_fd==-1) die("unable to open output file:%m")
     else dup2(out_fd,STDOUT_FILENO);
     int in_fd=open("in",O_RDONLY|O_CREAT,0666);
-    if(in_fd==-1) die("unable to open input file:%m");
+    if(in_fd==-1) die("unable to open input file:%m")
     else dup2(in_fd,STDIN_FILENO);
     int err_fd=open("err",O_WRONLY|O_CREAT,0666);
-    if(err_fd==-1) die("unable to open error file:%m");
+    if(err_fd==-1) die("unable to open error file:%m")
     else dup2(err_fd,STDERR_FILENO);
     if(chdir(cwd)) die("failed to chdir: %m");
     mnt_prepare("minrootfs",params->shared_folder);
diff --git a/starter/starter.c b/starter/starter.c
index ee618c8..d1ece92 100644
--- a/starter/starter.c
+++ b/starter/starter.c
@@ -141,7 +141,7 @@ int main(int argc,char** argv) {
     if (waitpid(nsrun_pid, NULL, 0) == -1) die("Failed to wait pid %d: %m\n", nsrun_pid);
     kill(kill_pid,SIGKILL);//kill killer
     int time = getmstime()-time_start;
-    chdir(params.shared_folder);
+    if(chdir(params.shared_folder)) die("Failed to chdir to shared folder:%m");
     if(time>=limits.time) {
         write_file("time", "-1");
     }
diff --git a/starter/util.h b/starter/util.h
index 7463939..835656c 100644
--- a/starter/util.h
+++ b/starter/util.h
@@ -1,10 +1,12 @@
+#define die(...) {fprintf(stderr,"file %s,line %d\n",__FILE__,__LINE__);die_func(__VA_ARGS__);}
 void remove_cgroup();
 
-static void die(const char *fmt, ...)
+static void die_func(const char *fmt, ...)
 {
     va_list params;
     va_start(params, fmt);
     vfprintf(stderr, fmt, params);
+    puts("\n");
     va_end(params);
     remove_cgroup();
     exit(1);