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