225 lines
6.7 KiB
C++
225 lines
6.7 KiB
C++
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/*=========================================================================*\
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* Select implementation
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* LuaSocket toolkit
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\*=========================================================================*/
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#include <string.h>
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#include "lua.h"
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#include "lauxlib.h"
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#include "socket.h"
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#include "timeout.h"
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#include "select.h"
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namespace NS_SLUA {
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/*=========================================================================*\
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* Internal function prototypes.
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\*=========================================================================*/
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static t_socket getfd(lua_State *L);
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static int dirty(lua_State *L);
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static void collect_fd(lua_State *L, int tab, int itab,
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fd_set *set, t_socket *max_fd);
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static int check_dirty(lua_State *L, int tab, int dtab, fd_set *set);
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static void return_fd(lua_State *L, fd_set *set, t_socket max_fd,
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int itab, int tab, int start);
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static void make_assoc(lua_State *L, int tab);
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static int global_select(lua_State *L);
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/* functions in library namespace */
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static luaL_Reg select_func[] = {
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{"select", global_select},
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{NULL, NULL}
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};
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/*=========================================================================*\
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* Exported functions
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\*=========================================================================*/
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/*-------------------------------------------------------------------------*\
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* Initializes module
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\*-------------------------------------------------------------------------*/
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int select_open(lua_State *L) {
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lua_pushstring(L, "_SETSIZE");
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lua_pushnumber(L, FD_SETSIZE);
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lua_rawset(L, -3);
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#if LUA_VERSION_NUM > 501 && !defined(LUA_COMPAT_MODULE)
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luaL_setfuncs(L, select_func, 0);
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#else
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luaL_openlib(L, NULL, select_func, 0);
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#endif
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return 0;
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}
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/*=========================================================================*\
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* Global Lua functions
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\*=========================================================================*/
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/*-------------------------------------------------------------------------*\
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* Waits for a set of sockets until a condition is met or timeout.
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\*-------------------------------------------------------------------------*/
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static int global_select(lua_State *L) {
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int rtab, wtab, itab, ret, ndirty;
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t_socket max_fd = SOCKET_INVALID;
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fd_set rset, wset;
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t_timeout tm;
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double t = luaL_optnumber(L, 3, -1);
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FD_ZERO(&rset); FD_ZERO(&wset);
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lua_settop(L, 3);
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lua_newtable(L); itab = lua_gettop(L);
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lua_newtable(L); rtab = lua_gettop(L);
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lua_newtable(L); wtab = lua_gettop(L);
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collect_fd(L, 1, itab, &rset, &max_fd);
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collect_fd(L, 2, itab, &wset, &max_fd);
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ndirty = check_dirty(L, 1, rtab, &rset);
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t = ndirty > 0? 0.0: t;
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timeout_init(&tm, t, -1);
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timeout_markstart(&tm);
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ret = socket_select(max_fd+1, &rset, &wset, NULL, &tm);
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if (ret > 0 || ndirty > 0) {
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return_fd(L, &rset, max_fd+1, itab, rtab, ndirty);
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return_fd(L, &wset, max_fd+1, itab, wtab, 0);
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make_assoc(L, rtab);
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make_assoc(L, wtab);
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return 2;
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} else if (ret == 0) {
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lua_pushstring(L, "timeout");
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return 3;
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} else {
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luaL_error(L, "select failed");
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return 3;
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}
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}
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/*=========================================================================*\
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* Internal functions
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\*=========================================================================*/
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static t_socket getfd(lua_State *L) {
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t_socket fd = SOCKET_INVALID;
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lua_pushstring(L, "getfd");
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lua_gettable(L, -2);
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if (!lua_isnil(L, -1)) {
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lua_pushvalue(L, -2);
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lua_call(L, 1, 1);
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if (lua_isnumber(L, -1)) {
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double numfd = lua_tonumber(L, -1);
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fd = (numfd >= 0.0)? (t_socket) numfd: SOCKET_INVALID;
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}
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}
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lua_pop(L, 1);
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return fd;
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}
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static int dirty(lua_State *L) {
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int is = 0;
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lua_pushstring(L, "dirty");
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lua_gettable(L, -2);
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if (!lua_isnil(L, -1)) {
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lua_pushvalue(L, -2);
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lua_call(L, 1, 1);
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is = lua_toboolean(L, -1);
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}
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lua_pop(L, 1);
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return is;
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}
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static void collect_fd(lua_State *L, int tab, int itab,
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fd_set *set, t_socket *max_fd) {
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int i = 1, n = 0;
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/* nil is the same as an empty table */
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if (lua_isnil(L, tab)) return;
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/* otherwise we need it to be a table */
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luaL_checktype(L, tab, LUA_TTABLE);
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for ( ;; ) {
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t_socket fd;
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lua_pushnumber(L, i);
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lua_gettable(L, tab);
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if (lua_isnil(L, -1)) {
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lua_pop(L, 1);
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break;
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}
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/* getfd figures out if this is a socket */
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fd = getfd(L);
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if (fd != SOCKET_INVALID) {
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/* make sure we don't overflow the fd_set */
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#ifdef _WIN32
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if (n >= FD_SETSIZE)
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luaL_argerror(L, tab, "too many sockets");
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#else
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if (fd >= FD_SETSIZE)
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luaL_argerror(L, tab, "descriptor too large for set size");
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#endif
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FD_SET(fd, set);
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n++;
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/* keep track of the largest descriptor so far */
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if (*max_fd == SOCKET_INVALID || *max_fd < fd)
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*max_fd = fd;
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/* make sure we can map back from descriptor to the object */
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lua_pushnumber(L, (lua_Number) fd);
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lua_pushvalue(L, -2);
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lua_settable(L, itab);
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}
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lua_pop(L, 1);
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i = i + 1;
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}
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}
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static int check_dirty(lua_State *L, int tab, int dtab, fd_set *set) {
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int ndirty = 0, i = 1;
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if (lua_isnil(L, tab))
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return 0;
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for ( ;; ) {
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t_socket fd;
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lua_pushnumber(L, i);
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lua_gettable(L, tab);
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if (lua_isnil(L, -1)) {
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lua_pop(L, 1);
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break;
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}
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fd = getfd(L);
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if (fd != SOCKET_INVALID && dirty(L)) {
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lua_pushnumber(L, ++ndirty);
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lua_pushvalue(L, -2);
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lua_settable(L, dtab);
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FD_CLR(fd, set);
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}
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lua_pop(L, 1);
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i = i + 1;
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}
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return ndirty;
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}
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static void return_fd(lua_State *L, fd_set *set, t_socket max_fd,
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int itab, int tab, int start) {
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t_socket fd;
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for (fd = 0; fd < max_fd; fd++) {
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if (FD_ISSET(fd, set)) {
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lua_pushnumber(L, ++start);
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lua_pushnumber(L, (lua_Number) fd);
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lua_gettable(L, itab);
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lua_settable(L, tab);
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}
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}
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}
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static void make_assoc(lua_State *L, int tab) {
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int i = 1, atab;
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lua_newtable(L); atab = lua_gettop(L);
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for ( ;; ) {
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lua_pushnumber(L, i);
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lua_gettable(L, tab);
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if (!lua_isnil(L, -1)) {
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lua_pushnumber(L, i);
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lua_pushvalue(L, -2);
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lua_settable(L, atab);
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lua_pushnumber(L, i);
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lua_settable(L, atab);
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} else {
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lua_pop(L, 1);
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break;
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}
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i = i+1;
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}
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}
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} // end NS_SLUA
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