176 lines
3.6 KiB
C
176 lines
3.6 KiB
C
/*
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* nixio - Linux I/O library for lua
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*
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* Copyright (C) 2009 Steven Barth <steven@midlink.org>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifdef __linux__
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#define _GNU_SOURCE
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#endif
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#include "nixio.h"
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#include <fcntl.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/param.h>
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#ifndef __WINNT__
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#ifndef BSD
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#include <sys/sendfile.h>
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#else
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/uio.h>
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#endif
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#ifdef _GNU_SOURCE
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/* guess what sucks... */
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#ifdef __UCLIBC__
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#include <unistd.h>
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#include <sys/syscall.h>
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ssize_t splice(int __fdin, __off64_t *__offin, int __fdout,
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__off64_t *__offout, size_t __len, unsigned int __flags) {
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#ifdef __NR_splice
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return syscall(__NR_splice, __fdin, __offin, __fdout, __offout, __len, __flags);
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#else
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(void)__fdin;
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(void)__offin;
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(void)__fdout;
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(void)__offout;
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(void)__len;
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(void)__flags;
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errno = ENOSYS;
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return -1;
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#endif
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}
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#undef SPLICE_F_MOVE
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#undef SPLICE_F_NONBLOCK
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#undef SPLICE_F_MORE
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#define SPLICE_F_MOVE 1
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#define SPLICE_F_NONBLOCK 2
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#define SPLICE_F_MORE 4
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#endif /* __UCLIBC__ */
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/**
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* splice(fd_in, fd_out, length, flags)
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*/
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static int nixio_splice(lua_State *L) {
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int fd_in = nixio__checkfd(L, 1);
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int fd_out = nixio__checkfd(L, 2);
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size_t len = luaL_checkinteger(L, 3);
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int flags = luaL_optinteger(L, 4, 0);
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long spliced;
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do {
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spliced = splice(fd_in, NULL, fd_out, NULL, len, flags);
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} while (spliced == -1 && errno == EINTR);
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if (spliced < 0) {
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return nixio__perror(L);
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}
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lua_pushinteger(L, spliced);
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return 1;
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}
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/**
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* Translate splice flags to integer
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*/
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static int nixio_splice_flags(lua_State *L) {
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const int j = lua_gettop(L);
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int flags = 0;
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for (int i=1; i<=j; i++) {
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const char *flag = luaL_checkstring(L, i);
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if (!strcmp(flag, "move")) {
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flags |= SPLICE_F_MOVE;
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} else if (!strcmp(flag, "nonblock")) {
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flags |= SPLICE_F_NONBLOCK;
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} else if (!strcmp(flag, "more")) {
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flags |= SPLICE_F_MORE;
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} else {
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return luaL_argerror(L, i, "supported values: "
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"move, nonblock, more");
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}
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}
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lua_pushinteger(L, flags);
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return 1;
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}
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#endif /* _GNU_SOURCE */
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/**
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* sendfile(outfd, infd, length)
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*/
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static int nixio_sendfile(lua_State *L) {
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int sock = nixio__checksockfd(L);
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int infd = nixio__checkfd(L, 2);
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size_t len = luaL_checkinteger(L, 3);
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off_t spliced;
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#ifndef BSD
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do {
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spliced = sendfile(sock, infd, NULL, len);
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} while (spliced == -1 && errno == EINTR);
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if (spliced == -1) {
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return nixio__perror(L);
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}
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#else
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int r;
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const off_t offset = lseek(infd, 0, SEEK_CUR);
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do {
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r = sendfile(infd, sock, offset, len, NULL, &spliced, 0);
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} while (r == -1 && errno == EINTR);
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if (r == -1) {
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return nixio__perror(L);
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}
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#endif
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lua_pushinteger(L, spliced);
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return 1;
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}
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/* module table */
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static const luaL_reg R[] = {
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#ifdef _GNU_SOURCE
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{"splice", nixio_splice},
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{"splice_flags", nixio_splice_flags},
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#endif
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{"sendfile", nixio_sendfile},
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{NULL, NULL}
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};
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void nixio_open_splice(lua_State *L) {
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luaL_register(L, NULL, R);
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}
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#else /* __WINNT__ */
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void nixio_open_splice(lua_State *L) {
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}
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#endif /* !__WINNT__ */
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