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/*=========================================================================*\
* Select implementation
* LuaSocket toolkit
*
* RCS ID: $Id$
\*=========================================================================*/
#include <string.h>
#include <lua.h>
#include <lauxlib.h>
#include "socket.h"
#include "select.h"
/*=========================================================================*\
* Internal function prototypes.
\*=========================================================================*/
static int getfd(lua_State *L);
static int dirty(lua_State *L);
static int collect_fd(lua_State *L, int tab, int max_fd, int itab, fd_set *set);
static int check_dirty(lua_State *L, int tab, int dtab, fd_set *set);
static void return_fd(lua_State *L, fd_set *set, int max_fd,
int itab, int tab, int start);
static void make_assoc(lua_State *L, int tab);
static int global_select(lua_State *L);
/* functions in library namespace */
static luaL_reg func[] = {
{"select", global_select},
{NULL, NULL}
};
/*=========================================================================*\
* Exported functions
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Initializes module
\*-------------------------------------------------------------------------*/
int select_open(lua_State *L) {
luaL_openlib(L, NULL, func, 0);
return 0;
}
/*=========================================================================*\
* Global Lua functions
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Waits for a set of sockets until a condition is met or timeout.
\*-------------------------------------------------------------------------*/
static int global_select(lua_State *L) {
int timeout, rtab, wtab, itab, max_fd, ret, ndirty;
fd_set rset, wset;
FD_ZERO(&rset); FD_ZERO(&wset);
lua_settop(L, 3);
timeout = lua_isnil(L, 3) ? -1 : (int)(luaL_checknumber(L, 3) * 1000);
lua_newtable(L); itab = lua_gettop(L);
lua_newtable(L); rtab = lua_gettop(L);
lua_newtable(L); wtab = lua_gettop(L);
max_fd = collect_fd(L, 1, -1, itab, &rset);
ndirty = check_dirty(L, 1, rtab, &rset);
timeout = ndirty > 0? 0: timeout;
max_fd = collect_fd(L, 2, max_fd, itab, &wset);
ret = sock_select(max_fd+1, &rset, &wset, NULL, timeout);
if (ret > 0 || (ret == 0 && ndirty > 0)) {
return_fd(L, &rset, max_fd+1, itab, rtab, ndirty);
return_fd(L, &wset, max_fd+1, itab, wtab, 0);
make_assoc(L, rtab);
make_assoc(L, wtab);
return 2;
} else if (ret == 0) {
lua_pushstring(L, "timeout");
return 3;
} else {
lua_pushnil(L);
lua_pushnil(L);
lua_pushstring(L, "error");
return 3;
}
}
/*=========================================================================*\
* Internal functions
\*=========================================================================*/
static int getfd(lua_State *L) {
int fd = -1;
lua_pushstring(L, "getfd");
lua_gettable(L, -2);
if (!lua_isnil(L, -1)) {
lua_pushvalue(L, -2);
lua_call(L, 1, 1);
if (lua_isnumber(L, -1))
fd = lua_tonumber(L, -1);
}
lua_pop(L, 1);
return fd;
}
static int dirty(lua_State *L) {
int is = 0;
lua_pushstring(L, "dirty");
lua_gettable(L, -2);
if (!lua_isnil(L, -1)) {
lua_pushvalue(L, -2);
lua_call(L, 1, 1);
is = lua_toboolean(L, -1);
}
lua_pop(L, 1);
return is;
}
static int collect_fd(lua_State *L, int tab, int max_fd,
int itab, fd_set *set) {
int i = 1;
if (lua_isnil(L, tab))
return max_fd;
while (1) {
int fd;
lua_pushnumber(L, i);
lua_gettable(L, tab);
if (lua_isnil(L, -1)) {
lua_pop(L, 1);
break;
}
fd = getfd(L);
if (fd > 0) {
FD_SET(fd, set);
if (max_fd < fd) max_fd = fd;
lua_pushnumber(L, fd);
lua_pushvalue(L, -2);
lua_settable(L, itab);
}
lua_pop(L, 1);
i = i + 1;
}
return max_fd;
}
static int check_dirty(lua_State *L, int tab, int dtab, fd_set *set) {
int ndirty = 0, i = 1;
if (lua_isnil(L, tab))
return 0;
while (1) {
int fd;
lua_pushnumber(L, i);
lua_gettable(L, tab);
if (lua_isnil(L, -1)) {
lua_pop(L, 1);
break;
}
fd = getfd(L);
if (fd > 0 && dirty(L)) {
lua_pushnumber(L, ++ndirty);
lua_pushvalue(L, -2);
lua_settable(L, dtab);
FD_CLR(fd, set);
}
lua_pop(L, 1);
i = i + 1;
}
return ndirty;
}
static void return_fd(lua_State *L, fd_set *set, int max_fd,
int itab, int tab, int start) {
int fd;
for (fd = 0; fd < max_fd; fd++) {
if (FD_ISSET(fd, set)) {
lua_pushnumber(L, ++start);
lua_pushnumber(L, fd);
lua_gettable(L, itab);
lua_settable(L, tab);
}
}
}
static void make_assoc(lua_State *L, int tab) {
int i = 1, atab;
lua_newtable(L); atab = lua_gettop(L);
while (1) {
lua_pushnumber(L, i);
lua_gettable(L, tab);
if (!lua_isnil(L, -1)) {
lua_pushnumber(L, i);
lua_pushvalue(L, -2);
lua_settable(L, atab);
lua_pushnumber(L, i);
lua_settable(L, atab);
} else {
lua_pop(L, 1);
break;
}
i = i+1;
}
}
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