diff --git a/libexec/flua/Makefile b/libexec/flua/Makefile
--- a/libexec/flua/Makefile
+++ b/libexec/flua/Makefile
@@ -18,7 +18,7 @@
 # FreeBSD Extensions
 .PATH: ${.CURDIR}/modules
 SRCS+=	linit_flua.c
-SRCS+=	lfs.c lposix.c
+SRCS+=	lfs.c lposix.c lfbsd.c
 
 CFLAGS+=	-I${SRCTOP}/lib/liblua -I${.CURDIR}/modules -I${LUASRC}
 CFLAGS+=	-DLUA_PROGNAME="\"${PROG}\""
diff --git a/libexec/flua/linit_flua.c b/libexec/flua/linit_flua.c
--- a/libexec/flua/linit_flua.c
+++ b/libexec/flua/linit_flua.c
@@ -35,6 +35,7 @@
 #include "lauxlib.h"
 #include "lfs.h"
 #include "lposix.h"
+#include "lfbsd.h"
 #include "lua_ucl.h"
 
 /*
@@ -60,6 +61,7 @@
   {"posix.sys.stat", luaopen_posix_sys_stat},
   {"posix.unistd", luaopen_posix_unistd},
   {"ucl", luaopen_ucl},
+  {"fbsd", luaopen_fbsd},
   {NULL, NULL}
 };
 
diff --git a/libexec/flua/modules/lfbsd.h b/libexec/flua/modules/lfbsd.h
new file mode 100644
--- /dev/null
+++ b/libexec/flua/modules/lfbsd.h
@@ -0,0 +1,32 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright 2023 Baptiste Daroussin <bapt@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted providing that the following conditions~
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <lua.h>
+
+int luaopen_fbsd(lua_State *L);
diff --git a/libexec/flua/modules/lfbsd.c b/libexec/flua/modules/lfbsd.c
new file mode 100644
--- /dev/null
+++ b/libexec/flua/modules/lfbsd.c
@@ -0,0 +1,134 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright 2023 Baptiste Daroussin <bapt@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted providing that the following conditions~
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/wait.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <spawn.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <lua.h>
+#include "lauxlib.h"
+#include "lfbsd.h"
+
+extern char **environ;
+
+static const char**
+luaL_checkarraystrings(lua_State *L, int arg)
+{
+	const char **ret;
+	lua_Integer n, i;
+	int t;
+	int abs_arg = lua_absindex(L, arg);
+	luaL_checktype(L, abs_arg, LUA_TTABLE);
+	n = lua_rawlen(L, abs_arg);
+	ret = lua_newuserdata(L, (n+1)*sizeof(char*));
+	for (i=0; i<n; i++) {
+		t = lua_rawgeti(L, abs_arg, i+1);
+		if (t == LUA_TNIL)
+			break;
+		luaL_argcheck(L, t == LUA_TSTRING, arg, "expected array of strings");
+		ret[i] = lua_tostring(L, -1);
+		lua_pop(L, 1);
+	}
+	ret[i] = NULL;
+	return ret;
+}
+
+static int
+lua_exec(lua_State *L)
+{
+	int r, pstat;
+	posix_spawn_file_actions_t action;
+	int stdin_pipe[2] = {-1, -1};
+	pid_t pid;
+	const char **argv;
+	int n = lua_gettop(L);
+	luaL_argcheck(L, n == 1, n > 1 ? 2 : n,
+	    "fbsd.exec takes exactly one argument");
+
+	if (pipe(stdin_pipe) < 0) {
+		lua_pushnil(L);
+		lua_pushstring(L, strerror(errno));
+		lua_pushinteger(L, errno);
+		return (3);
+	}
+
+	posix_spawn_file_actions_init(&action);
+	posix_spawn_file_actions_adddup2(&action, stdin_pipe[0], STDIN_FILENO);
+	posix_spawn_file_actions_addclose(&action, stdin_pipe[1]);
+
+	argv = luaL_checkarraystrings(L, 1);
+	if (0 != (r = posix_spawnp(&pid, argv[0], &action, NULL,
+		(char*const*)argv, environ))) {
+		lua_pushnil(L);
+		lua_pushstring(L, strerror(r));
+		lua_pushinteger(L, r);
+		return (3);
+	}
+	while (waitpid(pid, &pstat, 0) == -1) {
+		if (errno != EINTR) {
+			lua_pushnil(L);
+			lua_pushstring(L, strerror(r));
+			lua_pushinteger(L, r);
+			return (3);
+		}
+	}
+
+	if (WEXITSTATUS(pstat) != 0) {
+		lua_pushnil(L);
+		lua_pushstring(L, "Abnormal termination");
+		lua_pushinteger(L, r);
+		return (3);
+	}
+
+	posix_spawn_file_actions_destroy(&action);
+
+	if (stdin_pipe[0] != -1)
+		close(stdin_pipe[0]);
+	if (stdin_pipe[1] != -1)
+		close(stdin_pipe[1]);
+	lua_pushinteger(L, pid);
+	return 1;
+}
+
+#define REG_SIMPLE(n)	{ #n, lua_ ## n }
+static const struct luaL_Reg fbsd_lib[] = {
+	REG_SIMPLE(exec),
+	{ NULL, NULL },
+};
+#undef REG_SIMPLE
+
+int
+luaopen_fbsd(lua_State *L)
+{
+	luaL_newlib(L, fbsd_lib);
+	return (1);
+}