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diff --git a/libexec/flua/modules/lposix.c b/libexec/flua/modules/lposix.c
--- a/libexec/flua/modules/lposix.c
+++ b/libexec/flua/modules/lposix.c
@@ -165,6 +165,42 @@
}
+static int
+lua_dup2(lua_State *L)
+{
+ int error, oldd, newd, n;
+
+ n = lua_gettop(L);
+ luaL_argcheck(L, n == 2, n > 2 ? 3 : n,
+ "dup2 takes exactly two arguments");
+
+ oldd = luaL_checkinteger(L, 1);
+ if (oldd < 0) {
+ error = EBADF;
+ goto err;
+ }
+
+ newd = luaL_checkinteger(L, 2);
+ if (newd < 0) {
+ error = EBADF;
+ goto err;
+ }
+
+ error = dup2(oldd, newd);
+ if (error >= 0) {
+ lua_pushinteger(L, error);
+ return (1);
+ }
+
+ error = errno;
+err:
+ lua_pushnil(L);
+ lua_pushstring(L, strerror(error));
+ lua_pushinteger(L, error);
+ return (3);
+
+}
+
static int
lua_fnmatch(lua_State *L)
{
@@ -504,6 +540,7 @@
REG_SIMPLE(_exit),
REG_SIMPLE(chown),
REG_DEF(close, lua_pclose),
+ REG_SIMPLE(dup2),
REG_SIMPLE(fork),
REG_SIMPLE(getpid),
REG_SIMPLE(pipe),

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