2 * nixio - Linux I/O library for lua
4 * Copyright (C) 2009 Steven Barth <steven@midlink.org>
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
24 /* guess what sucks... */
27 #include <sys/syscall.h>
28 ssize_t splice(int __fdin, __off64_t *__offin, int __fdout,
29 __off64_t *__offout, size_t __len, unsigned int __flags) {
30 return syscall(__NR_splice, __fdin, __offin, __fdout, __offout, __len, __flags);
36 * Checks whether a flag is set in the table and translates it into a bitmap
38 static void nixio_splice_flags__w(lua_State *L, int *m, int f, const char *t) {
41 if (lua_toboolean(L, -1)) {
48 * Translate integer to poll flags and vice versa
50 static int nixio_splice_flags(lua_State *L) {
53 luaL_checktype(L, 1, LUA_TTABLE);
55 nixio_splice_flags__w(L, &flags, SPLICE_F_MOVE, "move");
56 nixio_splice_flags__w(L, &flags, SPLICE_F_NONBLOCK, "nonblock");
57 nixio_splice_flags__w(L, &flags, SPLICE_F_MORE, "more");
58 lua_pushinteger(L, flags);
63 static int nixio_splice(lua_State *L) {
64 int fd_in = nixio__checkfd(L, 1);
65 int fd_out = nixio__checkfd(L, 2);
66 size_t len = luaL_checkinteger(L, 3);
67 int flags = luaL_optinteger(L, 4, 0);
70 long spliced = splice(fd_in, NULL, fd_out, NULL, len, flags);
73 return nixio__perror(L);
76 lua_pushnumber(L, spliced);
83 static const luaL_reg R[] = {
84 {"splice", nixio_splice},
85 {"splice_flags", nixio_splice_flags},
89 void nixio_open_splice(lua_State *L) {
90 luaL_register(L, NULL, R);