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/*
* gcsd
*
* gcsd the generic command sequencer daemon can be used to serialize
* commands sent over various paralell communication channels to a
* single command output. It can be seen as a multiplexer for any
* kind of communication between a single resource and various clients
* which want to submit commands to it or query information from it.
* gcsd is written in C and Lua. The goal is to provide an easy to
* understand high level API based on Lua which can be used to
* implement the business logic of the so formed multiplexer daemon.
*
*
* Copyright (C) 2009-2010 Markus Grueneis <gimpf@spreadspace.org>
* Christian Pointner <equinox@spreadspace.org>
*
* This file is part of gcsd.
*
* gcsd is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* gcsd is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with gcsd. If not, see <http://www.gnu.org/licenses/>.
*/
#include <lua.h>
#include <lauxlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include "l_rawio.h"
static int l_rawio_open(lua_State *L)
{
const char* filename = luaL_checkstring(L,1);
const char* mode_str = luaL_checkstring(L,2);
int mode = 0;
if(strstr(mode_str, "O_RDONLY")) mode |= O_RDONLY;
if(strstr(mode_str, "O_WRONLY")) mode |= O_WRONLY;
if(strstr(mode_str, "O_RDWR")) mode |= O_RDWR;
int fd = open(filename, mode);
lua_pushinteger(L, fd);
return 1;
}
static int l_rawio_setnonblock(lua_State *L)
{
int fd = luaL_checkint(L,1);
int ret = fcntl(fd, F_SETFL, O_NONBLOCK);
if(ret == -1) {
lua_pushnil(L);
// FIXXXXXME: strerror is not threadsafe!!!
lua_pushstring(L, strerror(errno));
return 2;
}
lua_pushboolean(L, 1);
return 1;
}
static int l_rawio_write(lua_State *L)
{
int fd = luaL_checkint(L,1);
size_t len = 0;
const char* data = luaL_checklstring(L, 2, &len);
int ret = write(fd, data, len);
if(ret == -1) {
lua_pushnil(L);
// FIXXXXXME: strerror is not threadsafe!!!
lua_pushstring(L, strerror(errno));
return 2;
}
lua_pushinteger(L, ret);
return 1;
}
static int l_rawio_read(lua_State *L)
{
int fd = luaL_checkint(L,1);
size_t len = luaL_checkint(L,2);
char* data = malloc(len);
if(!data) {
lua_pushnil(L);
lua_pushstring(L, "bad alloc");
return 2;
}
int ret = read(fd, data, len);
if(ret == -1) {
lua_pushnil(L);
// FIXXXXXME: strerror is not threadsafe!!!
lua_pushstring(L, strerror(errno));
free(data);
return 2;
}
lua_pushlstring(L, data, ret);
free(data);
return 1;
}
static int l_rawio_close(lua_State *L)
{
close(luaL_checkint(L,1));
return 0;
}
static const struct luaL_reg rawio_funcs [] = {
{ "open", l_rawio_open },
{ "setnonblock", l_rawio_setnonblock },
{ "write", l_rawio_write },
{ "read", l_rawio_read },
{ "close", l_rawio_close },
{ NULL, NULL }
};
LUALIB_API int luaopen_rawio(lua_State *L)
{
luaL_register(L, LUA_RAWIOLIBNAME, rawio_funcs);
return 1;
}
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