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.
28 #include <sys/param.h>
31 #include <sys/sendfile.h>
33 #include <sys/types.h>
34 #include <sys/socket.h>
40 /* guess what sucks... */
43 #include <sys/syscall.h>
44 ssize_t splice(int __fdin, __off64_t *__offin, int __fdout,
45 __off64_t *__offout, size_t __len, unsigned int __flags) {
47 return syscall(__NR_splice, __fdin, __offin, __fdout, __offout, __len, __flags);
59 #endif /* __UCLIBC__ */
62 * splice(fd_in, fd_out, length, flags)
64 static int nixio_splice(lua_State *L) {
65 int fd_in = nixio__checkfd(L, 1);
66 int fd_out = nixio__checkfd(L, 2);
67 size_t len = luaL_checkinteger(L, 3);
68 int flags = luaL_optinteger(L, 4, 0);
72 spliced = splice(fd_in, NULL, fd_out, NULL, len, flags);
73 } while (spliced == -1 && errno == EINTR);
76 return nixio__perror(L);
79 lua_pushnumber(L, spliced);
84 * Translate splice flags to integer
86 static int nixio_splice_flags(lua_State *L) {
87 const int j = lua_gettop(L);
89 for (int i=1; i<=j; i++) {
90 const char *flag = luaL_checkstring(L, i);
91 if (!strcmp(flag, "move")) {
92 flags |= SPLICE_F_MOVE;
93 } else if (!strcmp(flag, "nonblock")) {
94 flags |= SPLICE_F_NONBLOCK;
95 } else if (!strcmp(flag, "more")) {
96 flags |= SPLICE_F_MORE;
98 return luaL_argerror(L, i, "supported values: "
99 "move, nonblock, more");
102 lua_pushinteger(L, flags);
107 #endif /* _GNU_SOURCE */
110 * sendfile(outfd, infd, length)
112 static int nixio_sendfile(lua_State *L) {
113 int sock = nixio__checksockfd(L);
114 int infd = nixio__checkfd(L, 2);
115 size_t len = luaL_checkinteger(L, 3);
120 spliced = sendfile(sock, infd, NULL, len);
121 } while (spliced == -1 && errno == EINTR);
124 return nixio__perror(L);
128 const off_t offset = lseek(infd, 0, SEEK_CUR);
131 r = sendfile(infd, sock, offset, len, NULL, &spliced, 0);
132 } while (r == -1 && errno == EINTR);
135 return nixio__perror(L);
139 lua_pushnumber(L, spliced);
144 static const luaL_reg R[] = {
146 {"splice", nixio_splice},
147 {"splice_flags", nixio_splice_flags},
149 {"sendfile", nixio_sendfile},
153 void nixio_open_splice(lua_State *L) {
154 luaL_register(L, NULL, R);