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.
26 #include <sys/sendfile.h>
28 /* guess what sucks... */
31 #include <sys/syscall.h>
32 ssize_t splice(int __fdin, __off64_t *__offin, int __fdout,
33 __off64_t *__offout, size_t __len, unsigned int __flags) {
35 return syscall(__NR_splice, __fdin, __offin, __fdout, __offout, __len, __flags);
47 #endif /* __UCLIBC__ */
50 * Translate splice flags to integer
52 static int nixio_splice_flags(lua_State *L) {
53 const int j = lua_gettop(L);
55 for (int i=1; i<=j; i++) {
56 const char *flag = luaL_checkstring(L, i);
57 if (!strcmp(flag, "move")) {
58 flags |= SPLICE_F_MOVE;
59 } else if (!strcmp(flag, "nonblock")) {
60 flags |= SPLICE_F_NONBLOCK;
61 } else if (!strcmp(flag, "more")) {
62 flags |= SPLICE_F_MORE;
64 return luaL_argerror(L, i, "supported values: "
65 "move, nonblock, more");
68 lua_pushinteger(L, flags);
74 * splice(fd_in, fd_out, length, flags)
76 static int nixio_splice(lua_State *L) {
77 int fd_in = nixio__checkfd(L, 1);
78 int fd_out = nixio__checkfd(L, 2);
79 size_t len = luaL_checkinteger(L, 3);
80 int flags = luaL_optinteger(L, 4, 0);
84 spliced = splice(fd_in, NULL, fd_out, NULL, len, flags);
85 } while (spliced == -1 && errno == EINTR);
88 return nixio__perror(L);
91 lua_pushnumber(L, spliced);
95 static int nixio_splice_avail(lua_State *L) {
96 splice(-1, 0, -1, 0, 0, 0);
97 lua_pushboolean(L, errno != ENOSYS);
102 * sendfile(outfd, infd, length)
104 static int nixio_sendfile(lua_State *L) {
105 int sockfd = nixio__checksockfd(L);
106 int infd = nixio__checkfd(L, 2);
107 size_t len = luaL_checkinteger(L, 3);
109 long spliced = sendfile(sockfd, infd, NULL, len);
112 return nixio__perror(L);
115 lua_pushnumber(L, spliced);
120 static const luaL_reg R[] = {
121 {"splice", nixio_splice},
122 {"splice_flags", nixio_splice_flags},
123 {"splice_avail", nixio_splice_avail},
124 {"sendfile", nixio_sendfile},
128 void nixio_open_splice(lua_State *L) {
129 luaL_register(L, NULL, R);