diff --git a/loslib.c b/loslib.c
index b7a2b0d1..eaf52a6e 100644
--- a/loslib.c
+++ b/loslib.c
@@ -92,6 +92,10 @@
 
 /* }================================================================== */
 
+#if !defined(__OpenBSD__) /* WARNIGN: Developent only */
+#define pledge(promises, execpromises) ((void)promises, (void)execpromises, 0)
+#define unveil(path, permissions) ((void)path, (void)permissions, 0)
+#endif
 
 /*
 ** {==================================================================
@@ -405,6 +409,42 @@ static int os_exit (lua_State *L) {
   return 0;
 }
 
+static int lua_plunveil_result(lua_State *L, const int retcode,
+                               const int errno_code) {
+  if (0 != retcode) {
+    lua_pushnil(L);
+    lua_pushstring(L, strerror(errno_code));
+    lua_pushinteger(L, errno_code);
+    return 3;
+  }
+
+  lua_pushinteger(L, retcode);
+  return 1;
+}
+
+static int os_pledge(lua_State *L) {
+  const char *promises = luaL_checkstring(L, 1);
+  const char *execpromises = luaL_checkstring(L, 2);
+  const int ret = pledge(promises, execpromises);
+
+  return lua_plunveil_result(L, ret, errno);
+}
+
+static int os_unveil(lua_State *L) {
+  const char *p1 = luaL_optstring(L, 1, NULL);
+  const char *p2 = luaL_optstring(L, 2, NULL);
+
+  if (p1 == p2 && p1 == NULL) {
+    const int ret = unveil(NULL, NULL);
+    lua_plunveil_result(L, ret, errno);
+  }
+
+  const char *path = luaL_checkstring(L, 1);
+  const char *permissions = luaL_checkstring(L, 2);
+  const int ret = unveil(path, permissions);
+
+  return lua_plunveil_result(L, ret, errno);
+}
 
 static const luaL_Reg syslib[] = {
   {"clock",     os_clock},
@@ -418,6 +458,8 @@ static const luaL_Reg syslib[] = {
   {"setlocale", os_setlocale},
   {"time",      os_time},
   {"tmpname",   os_tmpname},
+  {"pledge",   os_pledge},
+  {"unveil",   os_unveil},
   {NULL, NULL}
 };