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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
@@ -30,6 +30,8 @@
#include <sys/stat.h>
#include <errno.h>
+#include <grp.h>
+#include <pwd.h>
#include <string.h>
#include <unistd.h>
@@ -63,6 +65,62 @@
return 1;
}
+static int
+lua_chown(lua_State *L)
+{
+ int n;
+ const char *path;
+ uid_t owner = (uid_t) -1;
+ gid_t group = (gid_t) -1;
+
+ n = lua_gettop(L);
+ luaL_argcheck(L, n > 1, n,
+ "chown takes at least two arguments");
+ path = luaL_checkstring(L, 1);
+ if (lua_isinteger(L, 2))
+ owner = (uid_t) lua_tointeger(L, 2);
+ else if (lua_isstring(L, 2)) {
+ struct passwd *p = getpwnam(lua_tostring(L, 2));
+ if (p != NULL)
+ owner = p->pw_uid;
+ else
+ return (luaL_argerror(L, 2,
+ lua_pushfstring(L, "unknown user %s",
+ lua_tostring(L, 2))));
+ } else if (!lua_isnoneornil(L, 2)) {
+ const char *type = luaL_typename(L, 2);
+ return (luaL_argerror(L, 2,
+ lua_pushfstring(L, "integer or string expected, got %s",
+ type)));
+ }
+
+ if (lua_isinteger(L, 3))
+ group = (gid_t) lua_tointeger(L, 3);
+ else if (lua_isstring(L, 3)) {
+ struct group *g = getgrnam(lua_tostring(L, 3));
+ if (g != NULL)
+ group = g->gr_gid;
+ else
+ return (luaL_argerror(L, 3,
+ lua_pushfstring(L, "unknown user %s",
+ lua_tostring(L, 3))));
+ } else if (!lua_isnoneornil(L, 3)) {
+ const char *type = luaL_typename(L, 3);
+ return (luaL_argerror(L, 3,
+ lua_pushfstring(L, "integer or string expected, got %s",
+ type)));
+ }
+
+ if (chown(path, owner, group) == -1) {
+ lua_pushnil(L);
+ lua_pushstring(L, strerror(errno));
+ lua_pushinteger(L, errno);
+ return (3);
+ }
+ lua_pushinteger(L, 0);
+ return (1);
+}
+
static int
lua_getpid(lua_State *L)
{
@@ -82,6 +140,7 @@
static const struct luaL_Reg unistdlib[] = {
REG_SIMPLE(getpid),
+ REG_SIMPLE(chown),
{ NULL, NULL },
};
#undef REG_SIMPLE

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