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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.
*/
#define _GNU_SOURCE
#include "nixio.h"
#include <fcntl.h>
/* 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) {
return syscall(__NR_splice, __fdin, __offin, __fdout, __offout, __len, __flags);
}
#endif
/**
* Checks whether a flag is set in the table and translates it into a bitmap
*/
static void nixio_splice_flags__w(lua_State *L, int *m, int f, const char *t) {
lua_pushstring(L, t);
lua_rawget(L, -2);
if (lua_toboolean(L, -1)) {
*m |= f;
}
lua_pop(L, 1);
}
/**
* Translate integer to poll flags and vice versa
*/
static int nixio_splice_flags(lua_State *L) {
int flags = 0;
luaL_checktype(L, 1, LUA_TTABLE);
lua_settop(L, 1);
nixio_splice_flags__w(L, &flags, SPLICE_F_MOVE, "move");
nixio_splice_flags__w(L, &flags, SPLICE_F_NONBLOCK, "nonblock");
nixio_splice_flags__w(L, &flags, SPLICE_F_MORE, "more");
lua_pushinteger(L, flags);
return 1;
}
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 = splice(fd_in, NULL, fd_out, NULL, len, flags);
if (spliced < 0) {
return nixio__perror(L);
}
lua_pushnumber(L, spliced);
return 1;
}
/* module table */
static const luaL_reg R[] = {
{"splice", nixio_splice},
{"splice_flags", nixio_splice_flags},
{NULL, NULL}
};
void nixio_open_splice(lua_State *L) {
luaL_register(L, NULL, R);
}
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