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>
34 #include <sys/sendfile.h>
36 #include <sys/types.h>
37 #include <sys/socket.h>
43 /* guess what sucks... */
46 #include <sys/syscall.h>
47 ssize_t splice(int __fdin, __off64_t *__offin, int __fdout,
48 __off64_t *__offout, size_t __len, unsigned int __flags) {
50 return syscall(__NR_splice, __fdin, __offin, __fdout, __offout, __len, __flags);
62 #endif /* __UCLIBC__ */
65 * splice(fd_in, fd_out, length, flags)
67 static int nixio_splice(lua_State *L) {
68 int fd_in = nixio__checkfd(L, 1);
69 int fd_out = nixio__checkfd(L, 2);
70 size_t len = luaL_checkinteger(L, 3);
71 int flags = luaL_optinteger(L, 4, 0);
75 spliced = splice(fd_in, NULL, fd_out, NULL, len, flags);
76 } while (spliced == -1 && errno == EINTR);
79 return nixio__perror(L);
82 lua_pushnumber(L, spliced);
87 * Translate splice flags to integer
89 static int nixio_splice_flags(lua_State *L) {
90 const int j = lua_gettop(L);
92 for (int i=1; i<=j; i++) {
93 const char *flag = luaL_checkstring(L, i);
94 if (!strcmp(flag, "move")) {
95 flags |= SPLICE_F_MOVE;
96 } else if (!strcmp(flag, "nonblock")) {
97 flags |= SPLICE_F_NONBLOCK;
98 } else if (!strcmp(flag, "more")) {
99 flags |= SPLICE_F_MORE;
101 return luaL_argerror(L, i, "supported values: "
102 "move, nonblock, more");
105 lua_pushinteger(L, flags);
110 #endif /* _GNU_SOURCE */
113 * sendfile(outfd, infd, length)
115 static int nixio_sendfile(lua_State *L) {
116 int sock = nixio__checksockfd(L);
117 int infd = nixio__checkfd(L, 2);
118 size_t len = luaL_checkinteger(L, 3);
123 spliced = sendfile(sock, infd, NULL, len);
124 } while (spliced == -1 && errno == EINTR);
127 return nixio__perror(L);
131 const off_t offset = lseek(infd, 0, SEEK_CUR);
134 r = sendfile(infd, sock, offset, len, NULL, &spliced, 0);
135 } while (r == -1 && errno == EINTR);
138 return nixio__perror(L);
142 lua_pushnumber(L, spliced);
147 static const luaL_reg R[] = {
149 {"splice", nixio_splice},
150 {"splice_flags", nixio_splice_flags},
152 {"sendfile", nixio_sendfile},
157 void nixio_open_splice(lua_State *L) {
158 luaL_register(L, NULL, R);
161 #else /* __WINNT__ */
163 void nixio_open_splice(lua_State *L) {
166 #endif /* !__WINNT__ */