diff --git a/lib/util.cpp b/lib/util.cpp
index 1c8dce9ccb..1d0fe675ad 100644
--- a/lib/util.cpp
+++ b/lib/util.cpp
@@ -462,13 +462,13 @@ int run_program(
 
 #ifdef _WIN32
 int kill_program(int pid, int exit_code) {
-    int retval = -1;
+    int retval;
 
     HANDLE h = OpenProcess(PROCESS_TERMINATE, false, pid);
-    if (h == NULL && GetLastError() == ERROR_ACCESS_DENIED) return ERR_OPEN;
-    if (h == NULL && GetLastError() == ERROR_INVALID_PARAMETER) return ERR_INVALID_PARAM;
-    if (h == NULL && GetLastError() == ERROR_FILE_NOT_FOUND) return ERR_NOT_FOUND;
-    if (h == NULL) return ERR_IO;
+    if (h == NULL && GetLastError() == ERROR_ACCESS_DENIED) return EPERM;
+    if (h == NULL && GetLastError() == ERROR_INVALID_PARAMETER) return EINVAL;
+    if (h == NULL && GetLastError() == ERROR_FILE_NOT_FOUND) return ESRCH;
+    if (h == NULL) return EIO;
     if (TerminateProcess(h, exit_code)) {
         retval = 0;
     } else {
@@ -482,6 +482,14 @@ void kill_program(HANDLE pid) {
     TerminateProcess(pid, 0);
 }
 #else
+void int kill_program(int pid, int exit_code) {
+    int retval;
+    retval = kill(pid, SIGKILL);
+    if (-1 = retval) {
+        retval = errno;
+    }
+    return retval;
+}
 void kill_program(int pid) {
     kill(pid, SIGKILL);
 }
diff --git a/lib/util.h b/lib/util.h
index a74aad7c06..0db7588374 100644
--- a/lib/util.h
+++ b/lib/util.h
@@ -101,6 +101,7 @@ extern int run_program(
     const char* dir, const char* file, int argc, char *const argv[], double, int&
 );
 extern void kill_program(int);
+extern int kill_program(int, int);
 extern int get_exit_status(int);
 extern bool process_exists(int);
 #endif