~aranha/aranha/mainline : contents of luasocket/tcp.c at revision 119

~aranha/aranha/mainline : (revision 119)

/*=========================================================================*\
* TCP object 
* LuaSocket toolkit
*
* RCS ID: $Id: tcp.c,v 1.41 2005/10/07 04:40:59 diego Exp $
\*=========================================================================*/
#include <string.h> 

#include "lua.h"
#include "lauxlib.h"

#include "auxiliar.h"
#include "socket.h"
#include "inet.h"
#include "options.h"
#include "tcp.h"

/*=========================================================================*\
* Internal function prototypes
\*=========================================================================*/
static int global_create(lua_State *L);
static int meth_connect(lua_State *L);
static int meth_listen(lua_State *L);
static int meth_bind(lua_State *L);
static int meth_send(lua_State *L);
static int meth_getstats(lua_State *L);
static int meth_setstats(lua_State *L);
static int meth_getsockname(lua_State *L);
static int meth_getpeername(lua_State *L);
static int meth_shutdown(lua_State *L);
static int meth_receive(lua_State *L);
static int meth_accept(lua_State *L);
static int meth_close(lua_State *L);
static int meth_setoption(lua_State *L);
static int meth_settimeout(lua_State *L);
static int meth_getfd(lua_State *L);
static int meth_setfd(lua_State *L);
static int meth_dirty(lua_State *L);

/* tcp object methods */
static luaL_reg tcp[] = {
    {"__gc",        meth_close},
    {"__tostring",  auxiliar_tostring},
    {"accept",      meth_accept},
    {"bind",        meth_bind},
    {"close",       meth_close},
    {"connect",     meth_connect},
    {"dirty",       meth_dirty},
    {"getfd",       meth_getfd},
    {"getpeername", meth_getpeername},
    {"getsockname", meth_getsockname},
    {"getstats",    meth_getstats},
    {"setstats",    meth_setstats},
    {"listen",      meth_listen},
    {"receive",     meth_receive},
    {"send",        meth_send},
    {"setfd",       meth_setfd},
    {"setoption",   meth_setoption},
    {"setpeername", meth_connect},
    {"setsockname", meth_bind},
    {"settimeout",  meth_settimeout},
    {"shutdown",    meth_shutdown},
    {NULL,          NULL}
};

/* socket option handlers */
static t_opt opt[] = {
    {"keepalive",   opt_keepalive},
    {"reuseaddr",   opt_reuseaddr},
    {"tcp-nodelay", opt_tcp_nodelay},
    {"linger",      opt_linger},
    {NULL,          NULL}
};

/* functions in library namespace */
static luaL_reg func[] = {
    {"tcp", global_create},
    {NULL, NULL}
};

/*-------------------------------------------------------------------------*\
* Initializes module
\*-------------------------------------------------------------------------*/
int tcp_open(lua_State *L)
{
    /* create classes */
    auxiliar_newclass(L, "tcp{master}", tcp);
    auxiliar_newclass(L, "tcp{client}", tcp);
    auxiliar_newclass(L, "tcp{server}", tcp);
    /* create class groups */
    auxiliar_add2group(L, "tcp{master}", "tcp{any}");
    auxiliar_add2group(L, "tcp{client}", "tcp{any}");
    auxiliar_add2group(L, "tcp{server}", "tcp{any}");
    /* define library functions */
    luaL_openlib(L, NULL, func, 0); 
    return 0;
}

/*=========================================================================*\
* Lua methods
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Just call buffered IO methods
\*-------------------------------------------------------------------------*/
static int meth_send(lua_State *L) {
    p_tcp tcp = (p_tcp) auxiliar_checkclass(L, "tcp{client}", 1);
    return buffer_meth_send(L, &tcp->buf);
}

static int meth_receive(lua_State *L) {
    p_tcp tcp = (p_tcp) auxiliar_checkclass(L, "tcp{client}", 1);
    return buffer_meth_receive(L, &tcp->buf);
}

static int meth_getstats(lua_State *L) {
    p_tcp tcp = (p_tcp) auxiliar_checkclass(L, "tcp{client}", 1);
    return buffer_meth_getstats(L, &tcp->buf);
}

static int meth_setstats(lua_State *L) {
    p_tcp tcp = (p_tcp) auxiliar_checkclass(L, "tcp{client}", 1);
    return buffer_meth_setstats(L, &tcp->buf);
}

/*-------------------------------------------------------------------------*\
* Just call option handler
\*-------------------------------------------------------------------------*/
static int meth_setoption(lua_State *L)
{
    p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
    return opt_meth_setoption(L, opt, &tcp->sock);
}

/*-------------------------------------------------------------------------*\
* Select support methods
\*-------------------------------------------------------------------------*/
static int meth_getfd(lua_State *L)
{
    p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
    lua_pushnumber(L, (int) tcp->sock);
    return 1;
}

/* this is very dangerous, but can be handy for those that are brave enough */
static int meth_setfd(lua_State *L)
{
    p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
    tcp->sock = (t_socket) luaL_checknumber(L, 2); 
    return 0;
}

static int meth_dirty(lua_State *L)
{
    p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
    lua_pushboolean(L, !buffer_isempty(&tcp->buf));
    return 1;
}

/*-------------------------------------------------------------------------*\
* Waits for and returns a client object attempting connection to the 
* server object 
\*-------------------------------------------------------------------------*/
static int meth_accept(lua_State *L)
{
    p_tcp server = (p_tcp) auxiliar_checkclass(L, "tcp{server}", 1);
    p_timeout tm = timeout_markstart(&server->tm);
    t_socket sock;
    int err = socket_accept(&server->sock, &sock, NULL, NULL, tm);
    /* if successful, push client socket */
    if (err == IO_DONE) {
        p_tcp clnt = (p_tcp) lua_newuserdata(L, sizeof(t_tcp));
        auxiliar_setclass(L, "tcp{client}", -1);
        /* initialize structure fields */
        socket_setnonblocking(&sock);
        clnt->sock = sock;
        io_init(&clnt->io, (p_send) socket_send, (p_recv) socket_recv, 
                (p_error) socket_ioerror, &clnt->sock);
        timeout_init(&clnt->tm, -1, -1);
        buffer_init(&clnt->buf, &clnt->io, &clnt->tm);
        return 1;
    } else {
        lua_pushnil(L); 
        lua_pushstring(L, socket_strerror(err));
        return 2;
    }
}

/*-------------------------------------------------------------------------*\
* Binds an object to an address 
\*-------------------------------------------------------------------------*/
static int meth_bind(lua_State *L)
{
    p_tcp tcp = (p_tcp) auxiliar_checkclass(L, "tcp{master}", 1);
    const char *address =  luaL_checkstring(L, 2);
    unsigned short port = (unsigned short) luaL_checknumber(L, 3);
    const char *err = inet_trybind(&tcp->sock, address, port);
    if (err) {
        lua_pushnil(L);
        lua_pushstring(L, err);
        return 2;
    }
    lua_pushnumber(L, 1);
    return 1;
}

/*-------------------------------------------------------------------------*\
* Turns a master tcp object into a client object.
\*-------------------------------------------------------------------------*/
static int meth_connect(lua_State *L)
{
    p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
    const char *address =  luaL_checkstring(L, 2);
    unsigned short port = (unsigned short) luaL_checknumber(L, 3);
    p_timeout tm = timeout_markstart(&tcp->tm);
    const char *err = inet_tryconnect(&tcp->sock, address, port, tm);
    /* have to set the class even if it failed due to non-blocking connects */
    auxiliar_setclass(L, "tcp{client}", 1);
    if (err) {
        lua_pushnil(L);
        lua_pushstring(L, err);
        return 2;
    }
    /* turn master object into a client object */
    lua_pushnumber(L, 1);
    return 1;
}

/*-------------------------------------------------------------------------*\
* Closes socket used by object 
\*-------------------------------------------------------------------------*/
static int meth_close(lua_State *L)
{
    p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
    socket_destroy(&tcp->sock);
    lua_pushnumber(L, 1);
    return 1;
}

/*-------------------------------------------------------------------------*\
* Puts the sockt in listen mode
\*-------------------------------------------------------------------------*/
static int meth_listen(lua_State *L)
{
    p_tcp tcp = (p_tcp) auxiliar_checkclass(L, "tcp{master}", 1);
    int backlog = (int) luaL_optnumber(L, 2, 32);
    int err = socket_listen(&tcp->sock, backlog);
    if (err != IO_DONE) {
        lua_pushnil(L);
        lua_pushstring(L, socket_strerror(err));
        return 2;
    }
    /* turn master object into a server object */
    auxiliar_setclass(L, "tcp{server}", 1);
    lua_pushnumber(L, 1);
    return 1;
}

/*-------------------------------------------------------------------------*\
* Shuts the connection down partially
\*-------------------------------------------------------------------------*/
static int meth_shutdown(lua_State *L)
{
    p_tcp tcp = (p_tcp) auxiliar_checkclass(L, "tcp{client}", 1);
    const char *how = luaL_optstring(L, 2, "both");
    switch (how[0]) {
        case 'b':
            if (strcmp(how, "both")) goto error;
            socket_shutdown(&tcp->sock, 2);
            break;
        case 's':
            if (strcmp(how, "send")) goto error;
            socket_shutdown(&tcp->sock, 1);
            break;
        case 'r':
            if (strcmp(how, "receive")) goto error;
            socket_shutdown(&tcp->sock, 0);
            break;
    }
    lua_pushnumber(L, 1);
    return 1;
error:
    luaL_argerror(L, 2, "invalid shutdown method");
    return 0;
}

/*-------------------------------------------------------------------------*\
* Just call inet methods
\*-------------------------------------------------------------------------*/
static int meth_getpeername(lua_State *L)
{
    p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
    return inet_meth_getpeername(L, &tcp->sock);
}

static int meth_getsockname(lua_State *L)
{
    p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
    return inet_meth_getsockname(L, &tcp->sock);
}

/*-------------------------------------------------------------------------*\
* Just call tm methods
\*-------------------------------------------------------------------------*/
static int meth_settimeout(lua_State *L)
{
    p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
    return timeout_meth_settimeout(L, &tcp->tm);
}

/*=========================================================================*\
* Library functions
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Creates a master tcp object 
\*-------------------------------------------------------------------------*/
static int global_create(lua_State *L)
{
    t_socket sock;
    const char *err = inet_trycreate(&sock, SOCK_STREAM);
    /* try to allocate a system socket */
    if (!err) { 
        /* allocate tcp object */
        p_tcp tcp = (p_tcp) lua_newuserdata(L, sizeof(t_tcp));
        /* set its type as master object */
        auxiliar_setclass(L, "tcp{master}", -1);
        /* initialize remaining structure fields */
        socket_setnonblocking(&sock);
        tcp->sock = sock;
        io_init(&tcp->io, (p_send) socket_send, (p_recv) socket_recv, 
                (p_error) socket_ioerror, &tcp->sock);
        timeout_init(&tcp->tm, -1, -1);
        buffer_init(&tcp->buf, &tcp->io, &tcp->tm);
        return 1;
    } else {
        lua_pushnil(L);
        lua_pushstring(L, err);
        return 2;
    }
}

82.2.2 by Daniel Silverstone Add luasocket sources	1	/=========================================================================\
	2	* TCP object
	3	* LuaSocket toolkit
	4	*
	5	* RCS ID: $Id: tcp.c,v 1.41 2005/10/07 04:40:59 diego Exp $
	6	\=========================================================================/
	7	#include <string.h>
	8
	9	#include "lua.h"
	10	#include "lauxlib.h"
	11
	12	#include "auxiliar.h"
	13	#include "socket.h"
	14	#include "inet.h"
	15	#include "options.h"
	16	#include "tcp.h"
	17
	18	/=========================================================================\
	19	* Internal function prototypes
	20	\=========================================================================/
	21	static int global_create(lua_State *L);
	22	static int meth_connect(lua_State *L);
	23	static int meth_listen(lua_State *L);
	24	static int meth_bind(lua_State *L);
	25	static int meth_send(lua_State *L);
	26	static int meth_getstats(lua_State *L);
	27	static int meth_setstats(lua_State *L);
	28	static int meth_getsockname(lua_State *L);
	29	static int meth_getpeername(lua_State *L);
	30	static int meth_shutdown(lua_State *L);
	31	static int meth_receive(lua_State *L);
	32	static int meth_accept(lua_State *L);
	33	static int meth_close(lua_State *L);
	34	static int meth_setoption(lua_State *L);
	35	static int meth_settimeout(lua_State *L);
	36	static int meth_getfd(lua_State *L);
	37	static int meth_setfd(lua_State *L);
	38	static int meth_dirty(lua_State *L);
	39
	40	/* tcp object methods */
	41	static luaL_reg tcp[] = {
	42	{"__gc", meth_close},
	43	{"__tostring", auxiliar_tostring},
	44	{"accept", meth_accept},
	45	{"bind", meth_bind},
	46	{"close", meth_close},
	47	{"connect", meth_connect},
	48	{"dirty", meth_dirty},
	49	{"getfd", meth_getfd},
	50	{"getpeername", meth_getpeername},
	51	{"getsockname", meth_getsockname},
	52	{"getstats", meth_getstats},
	53	{"setstats", meth_setstats},
	54	{"listen", meth_listen},
	55	{"receive", meth_receive},
	56	{"send", meth_send},
	57	{"setfd", meth_setfd},
	58	{"setoption", meth_setoption},
	59	{"setpeername", meth_connect},
	60	{"setsockname", meth_bind},
	61	{"settimeout", meth_settimeout},
	62	{"shutdown", meth_shutdown},
	63	{NULL, NULL}
	64	};
65
66	/* socket option handlers */
67	static t_opt opt[] = {
68	{"keepalive", opt_keepalive},
69	{"reuseaddr", opt_reuseaddr},
70	{"tcp-nodelay", opt_tcp_nodelay},
71	{"linger", opt_linger},
72	{NULL, NULL}
73	};
74
75	/* functions in library namespace */
76	static luaL_reg func[] = {
77	{"tcp", global_create},
78	{NULL, NULL}
79	};
80
81	/-------------------------------------------------------------------------\
82	* Initializes module
83	\-------------------------------------------------------------------------/
84	int tcp_open(lua_State *L)
85	{
86	/* create classes */
87	auxiliar_newclass(L, "tcp{master}", tcp);
88	auxiliar_newclass(L, "tcp{client}", tcp);
89	auxiliar_newclass(L, "tcp{server}", tcp);
90	/* create class groups */
91	auxiliar_add2group(L, "tcp{master}", "tcp{any}");
92	auxiliar_add2group(L, "tcp{client}", "tcp{any}");
93	auxiliar_add2group(L, "tcp{server}", "tcp{any}");
94	/* define library functions */
95	luaL_openlib(L, NULL, func, 0);
96	return 0;
97	}
98
99	/=========================================================================\
100	* Lua methods
101	\=========================================================================/
102	/-------------------------------------------------------------------------\
103	* Just call buffered IO methods
104	\-------------------------------------------------------------------------/
105	static int meth_send(lua_State *L) {
106	p_tcp tcp = (p_tcp) auxiliar_checkclass(L, "tcp{client}", 1);
107	return buffer_meth_send(L, &tcp->buf);
108	}
109
110	static int meth_receive(lua_State *L) {
111	p_tcp tcp = (p_tcp) auxiliar_checkclass(L, "tcp{client}", 1);
112	return buffer_meth_receive(L, &tcp->buf);
113	}
114
115	static int meth_getstats(lua_State *L) {
116	p_tcp tcp = (p_tcp) auxiliar_checkclass(L, "tcp{client}", 1);
117	return buffer_meth_getstats(L, &tcp->buf);
118	}
119
120	static int meth_setstats(lua_State *L) {
121	p_tcp tcp = (p_tcp) auxiliar_checkclass(L, "tcp{client}", 1);
122	return buffer_meth_setstats(L, &tcp->buf);
123	}
124
125	/-------------------------------------------------------------------------\
126	* Just call option handler
127	\-------------------------------------------------------------------------/
128	static int meth_setoption(lua_State *L)
129	{
130	p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
131	return opt_meth_setoption(L, opt, &tcp->sock);
132	}
133
134	/-------------------------------------------------------------------------\
135	* Select support methods
136	\-------------------------------------------------------------------------/
137	static int meth_getfd(lua_State *L)
138	{
139	p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
140	lua_pushnumber(L, (int) tcp->sock);
141	return 1;
142	}
143
144	/* this is very dangerous, but can be handy for those that are brave enough */
145	static int meth_setfd(lua_State *L)
146	{
147	p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
148	tcp->sock = (t_socket) luaL_checknumber(L, 2);
149	return 0;
150	}
151
152	static int meth_dirty(lua_State *L)
153	{
154	p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
155	lua_pushboolean(L, !buffer_isempty(&tcp->buf));
156	return 1;
157	}
158
159	/-------------------------------------------------------------------------\
160	* Waits for and returns a client object attempting connection to the
161	* server object
162	\-------------------------------------------------------------------------/
163	static int meth_accept(lua_State *L)
164	{
165	p_tcp server = (p_tcp) auxiliar_checkclass(L, "tcp{server}", 1);
166	p_timeout tm = timeout_markstart(&server->tm);
167	t_socket sock;
168	int err = socket_accept(&server->sock, &sock, NULL, NULL, tm);
169	/* if successful, push client socket */
170	if (err == IO_DONE) {
171	p_tcp clnt = (p_tcp) lua_newuserdata(L, sizeof(t_tcp));
172	auxiliar_setclass(L, "tcp{client}", -1);
173	/* initialize structure fields */
174	socket_setnonblocking(&sock);
175	clnt->sock = sock;
176	io_init(&clnt->io, (p_send) socket_send, (p_recv) socket_recv,
177	(p_error) socket_ioerror, &clnt->sock);
178	timeout_init(&clnt->tm, -1, -1);
179	buffer_init(&clnt->buf, &clnt->io, &clnt->tm);
180	return 1;
181	} else {
182	lua_pushnil(L);
183	lua_pushstring(L, socket_strerror(err));
184	return 2;
185	}
186	}
187
188	/-------------------------------------------------------------------------\
189	* Binds an object to an address
190	\-------------------------------------------------------------------------/
191	static int meth_bind(lua_State *L)
192	{
193	p_tcp tcp = (p_tcp) auxiliar_checkclass(L, "tcp{master}", 1);
194	const char *address = luaL_checkstring(L, 2);
195	unsigned short port = (unsigned short) luaL_checknumber(L, 3);
196	const char *err = inet_trybind(&tcp->sock, address, port);
197	if (err) {
198	lua_pushnil(L);
199	lua_pushstring(L, err);
200	return 2;
201	}
202	lua_pushnumber(L, 1);
203	return 1;
204	}
205
206	/-------------------------------------------------------------------------\
207	* Turns a master tcp object into a client object.
208	\-------------------------------------------------------------------------/
209	static int meth_connect(lua_State *L)
210	{
211	p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
212	const char *address = luaL_checkstring(L, 2);
213	unsigned short port = (unsigned short) luaL_checknumber(L, 3);
214	p_timeout tm = timeout_markstart(&tcp->tm);
215	const char *err = inet_tryconnect(&tcp->sock, address, port, tm);
216	/* have to set the class even if it failed due to non-blocking connects */
217	auxiliar_setclass(L, "tcp{client}", 1);
218	if (err) {
219	lua_pushnil(L);
220	lua_pushstring(L, err);
221	return 2;
222	}
223	/* turn master object into a client object */
224	lua_pushnumber(L, 1);
225	return 1;
226	}
227
228	/-------------------------------------------------------------------------\
229	* Closes socket used by object
230	\-------------------------------------------------------------------------/
231	static int meth_close(lua_State *L)
232	{
233	p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
234	socket_destroy(&tcp->sock);
235	lua_pushnumber(L, 1);
236	return 1;
237	}
238
239	/-------------------------------------------------------------------------\
240	* Puts the sockt in listen mode
241	\-------------------------------------------------------------------------/
242	static int meth_listen(lua_State *L)
243	{
244	p_tcp tcp = (p_tcp) auxiliar_checkclass(L, "tcp{master}", 1);
245	int backlog = (int) luaL_optnumber(L, 2, 32);
246	int err = socket_listen(&tcp->sock, backlog);
247	if (err != IO_DONE) {
248	lua_pushnil(L);
249	lua_pushstring(L, socket_strerror(err));
250	return 2;
251	}
252	/* turn master object into a server object */
253	auxiliar_setclass(L, "tcp{server}", 1);
254	lua_pushnumber(L, 1);
255	return 1;
256	}
257
258	/-------------------------------------------------------------------------\
259	* Shuts the connection down partially
260	\-------------------------------------------------------------------------/
261	static int meth_shutdown(lua_State *L)
262	{
263	p_tcp tcp = (p_tcp) auxiliar_checkclass(L, "tcp{client}", 1);
264	const char *how = luaL_optstring(L, 2, "both");
265	switch (how[0]) {
266	case 'b':
267	if (strcmp(how, "both")) goto error;
268	socket_shutdown(&tcp->sock, 2);
269	break;
270	case 's':
271	if (strcmp(how, "send")) goto error;
272	socket_shutdown(&tcp->sock, 1);
273	break;
274	case 'r':
275	if (strcmp(how, "receive")) goto error;
276	socket_shutdown(&tcp->sock, 0);
277	break;
278	}
279	lua_pushnumber(L, 1);
280	return 1;
281	error:
282	luaL_argerror(L, 2, "invalid shutdown method");
283	return 0;
284	}
285
286	/-------------------------------------------------------------------------\
287	* Just call inet methods
288	\-------------------------------------------------------------------------/
289	static int meth_getpeername(lua_State *L)
290	{
291	p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
292	return inet_meth_getpeername(L, &tcp->sock);
293	}
294
295	static int meth_getsockname(lua_State *L)
296	{
297	p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
298	return inet_meth_getsockname(L, &tcp->sock);
299	}
300
301	/-------------------------------------------------------------------------\
302	* Just call tm methods
303	\-------------------------------------------------------------------------/
304	static int meth_settimeout(lua_State *L)
305	{
306	p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
307	return timeout_meth_settimeout(L, &tcp->tm);
308	}
309
310	/=========================================================================\
311	* Library functions
312	\=========================================================================/
313	/-------------------------------------------------------------------------\
314	* Creates a master tcp object
315	\-------------------------------------------------------------------------/
316	static int global_create(lua_State *L)
317	{
318	t_socket sock;
319	const char *err = inet_trycreate(&sock, SOCK_STREAM);
320	/* try to allocate a system socket */
321	if (!err) {
322	/* allocate tcp object */
323	p_tcp tcp = (p_tcp) lua_newuserdata(L, sizeof(t_tcp));
324	/* set its type as master object */
325	auxiliar_setclass(L, "tcp{master}", -1);
326	/* initialize remaining structure fields */
327	socket_setnonblocking(&sock);
328	tcp->sock = sock;
329	io_init(&tcp->io, (p_send) socket_send, (p_recv) socket_recv,
330	(p_error) socket_ioerror, &tcp->sock);
331	timeout_init(&tcp->tm, -1, -1);
332	buffer_init(&tcp->buf, &tcp->io, &tcp->tm);
333	return 1;
334	} else {
335	lua_pushnil(L);
336	lua_pushstring(L, err);
337	return 2;
338	}
339	}