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/*
* rhnop
*
* Copyright (C) 2011-2016 Christian Pointner <equinox@helsinki.at>
*
* This file is part of rhnop.
*
* rhnop 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.
*
* rhnop 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 rhnop. If not, see <http://www.gnu.org/licenses/>.
*/
#include <lua.h>
#include <lauxlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include "l_pipe.h"
static int pipefds_[2];
int pipe_init()
{
return pipe(pipefds_);
}
void pipe_close()
{
close(pipefds_[0]);
close(pipefds_[1]);
}
static int l_pipe_signal(lua_State *L)
{
size_t len = 0, written = 0;
const char* data = luaL_checklstring(L, 1, &len);
len++; // also send trailing zero
int ret = 0;
for(;;) {
ret = write(pipefds_[1], &(data[written]), len - written);
if(!ret) continue;
if(ret == -1 && (errno == EAGAIN || errno == EINTR)) continue;
written += ret;
if(written == len) break;
break;
}
lua_pushinteger(L, ret);
return 1;
}
static int l_pipe_getfd(lua_State *L)
{
if(!lua_istable(L, -1))
luaL_error(L, "can't retreive pipe fd");
lua_pushliteral(L, "fd");
lua_gettable(L, -2);
return 1;
}
static int l_pipe_dirty(lua_State *L)
{
lua_pushboolean(L, 0);
return 1;
}
static int l_pipe_getreadfd(lua_State *L)
{
lua_newtable(L);
lua_pushliteral(L, "fd");
lua_pushinteger(L, pipefds_[0]);
lua_settable(L, -3);
lua_pushliteral(L, "getfd");
lua_pushcfunction(L, l_pipe_getfd);
lua_settable(L, -3);
lua_pushliteral(L, "dirty");
lua_pushcfunction(L, l_pipe_dirty);
lua_settable(L, -3);
return 1;
}
static int l_pipe_consume(lua_State *L)
{
char data[17]; // 17 should be sufficient
size_t len = 0;
int ret = 0;
for(;;) {
ret = read(pipefds_[0], &(data[len]), 1);
if(ret == 0) break;
if(ret == -1 && (errno == EAGAIN || errno == EINTR)) continue;
if(data[len] == 0)
break;
len += ret;
if(len >= sizeof(data)) {
ret = 0;
break;
}
}
if(ret)
lua_pushstring(L, data);
else
lua_pushnil(L);
return 1;
}
static const struct luaL_Reg pipe_funcs [] = {
{ "signal", l_pipe_signal },
{ "getreadfd", l_pipe_getreadfd },
{ "consume", l_pipe_consume },
{ NULL, NULL }
};
LUALIB_API int luaopen_pipe(lua_State *L)
{
#if LUA_VERSION_NUM > 501
lua_newtable(L);
luaL_setfuncs(L, pipe_funcs, 0);
lua_pushvalue(L, -1);
lua_setglobal(L, LUA_PIPELIBNAME);
#else
luaL_register(L, LUA_PIPELIBNAME, pipe_funcs);
#endif
return 1;
}
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