[unix-history] / lib / librpc / rpc / svc_tcp.c

/* @(#)svc_tcp.c	2.2 88/08/01 4.0 RPCSRC */
/*
 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
 * unrestricted use provided that this legend is included on all tape
 * media and as a part of the software program in whole or part.  Users
 * may copy or modify Sun RPC without charge, but are not authorized
 * to license or distribute it to anyone else except as part of a product or
 * program developed by the user.
 * 
 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
 * 
 * Sun RPC is provided with no support and without any obligation on the
 * part of Sun Microsystems, Inc. to assist in its use, correction,
 * modification or enhancement.
 * 
 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
 * OR ANY PART THEREOF.
 * 
 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
 * or profits or other special, indirect and consequential damages, even if
 * Sun has been advised of the possibility of such damages.
 * 
 * Sun Microsystems, Inc.
 * 2550 Garcia Avenue
 * Mountain View, California  94043
 */
#if !defined(lint) && defined(SCCSIDS)
static char sccsid[] = "@(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro";
#endif

/*
 * svc_tcp.c, Server side for TCP/IP based RPC. 
 *
 * Copyright (C) 1984, Sun Microsystems, Inc.
 *
 * Actually implements two flavors of transporter -
 * a tcp rendezvouser (a listner and connection establisher)
 * and a record/tcp stream.
 */

#include <stdio.h>
#include <rpc/rpc.h>
#include <sys/socket.h>
#include <errno.h>
extern bool_t abort();
extern errno;

/*
 * Ops vector for TCP/IP based rpc service handle
 */
static bool_t		svctcp_recv();
static enum xprt_stat	svctcp_stat();
static bool_t		svctcp_getargs();
static bool_t		svctcp_reply();
static bool_t		svctcp_freeargs();
static void		svctcp_destroy();

static struct xp_ops svctcp_op = {
	svctcp_recv,
	svctcp_stat,
	svctcp_getargs,
	svctcp_reply,
	svctcp_freeargs,
	svctcp_destroy
};

/*
 * Ops vector for TCP/IP rendezvous handler
 */
static bool_t		rendezvous_request();
static enum xprt_stat	rendezvous_stat();

static struct xp_ops svctcp_rendezvous_op = {
	rendezvous_request,
	rendezvous_stat,
	abort,
	abort,
	abort,
	svctcp_destroy
};

static int readtcp(), writetcp();
static SVCXPRT *makefd_xprt();

struct tcp_rendezvous { /* kept in xprt->xp_p1 */
	u_int sendsize;
	u_int recvsize;
};

struct tcp_conn {  /* kept in xprt->xp_p1 */
	enum xprt_stat strm_stat;
	u_long x_id;
	XDR xdrs;
	char verf_body[MAX_AUTH_BYTES];
};

/*
 * Usage:
 *	xprt = svctcp_create(sock, send_buf_size, recv_buf_size);
 *
 * Creates, registers, and returns a (rpc) tcp based transporter.
 * Once *xprt is initialized, it is registered as a transporter
 * see (svc.h, xprt_register).  This routine returns
 * a NULL if a problem occurred.
 *
 * If sock<0 then a socket is created, else sock is used.
 * If the socket, sock is not bound to a port then svctcp_create
 * binds it to an arbitrary port.  The routine then starts a tcp
 * listener on the socket's associated port.  In any (successful) case,
 * xprt->xp_sock is the registered socket number and xprt->xp_port is the
 * associated port number.
 *
 * Since tcp streams do buffered io similar to stdio, the caller can specify
 * how big the send and receive buffers are via the second and third parms;
 * 0 => use the system default.
 */
SVCXPRT *
svctcp_create(sock, sendsize, recvsize)
	register int sock;
	u_int sendsize;
	u_int recvsize;
{
	bool_t madesock = FALSE;
	register SVCXPRT *xprt;
	register struct tcp_rendezvous *r;
	struct sockaddr_in addr;
	int len = sizeof(struct sockaddr_in);

	if (sock == RPC_ANYSOCK) {
		if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
			perror("svctcp_.c - udp socket creation problem");
			return ((SVCXPRT *)NULL);
		}
		madesock = TRUE;
	}
	bzero((char *)&addr, sizeof (addr));
	addr.sin_family = AF_INET;
	if (bindresvport(sock, &addr)) {
		addr.sin_port = 0;
		(void)bind(sock, (struct sockaddr *)&addr, len);
	}
	if ((getsockname(sock, (struct sockaddr *)&addr, &len) != 0)  ||
	    (listen(sock, 2) != 0)) {
		perror("svctcp_.c - cannot getsockname or listen");
		if (madesock)
		       (void)close(sock);
		return ((SVCXPRT *)NULL);
	}
	r = (struct tcp_rendezvous *)mem_alloc(sizeof(*r));
	if (r == NULL) {
		(void) fprintf(stderr, "svctcp_create: out of memory\n");
		return (NULL);
	}
	r->sendsize = sendsize;
	r->recvsize = recvsize;
	xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
	if (xprt == NULL) {
		(void) fprintf(stderr, "svctcp_create: out of memory\n");
		return (NULL);
	}
	xprt->xp_p2 = NULL;
	xprt->xp_p1 = (caddr_t)r;
	xprt->xp_verf = _null_auth;
	xprt->xp_ops = &svctcp_rendezvous_op;
	xprt->xp_port = ntohs(addr.sin_port);
	xprt->xp_sock = sock;
	xprt_register(xprt);
	return (xprt);
}

/*
 * Like svtcp_create(), except the routine takes any *open* UNIX file
 * descriptor as its first input.
 */
SVCXPRT *
svcfd_create(fd, sendsize, recvsize)
	int fd;
	u_int sendsize;
	u_int recvsize;
{

	return (makefd_xprt(fd, sendsize, recvsize));
}

static SVCXPRT *
makefd_xprt(fd, sendsize, recvsize)
	int fd;
	u_int sendsize;
	u_int recvsize;
{
	register SVCXPRT *xprt;
	register struct tcp_conn *cd;
 
	xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
	if (xprt == (SVCXPRT *)NULL) {
		(void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n");
		goto done;
	}
	cd = (struct tcp_conn *)mem_alloc(sizeof(struct tcp_conn));
	if (cd == (struct tcp_conn *)NULL) {
		(void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n");
		mem_free((char *) xprt, sizeof(SVCXPRT));
		xprt = (SVCXPRT *)NULL;
		goto done;
	}
	cd->strm_stat = XPRT_IDLE;
	xdrrec_create(&(cd->xdrs), sendsize, recvsize,
	    (caddr_t)xprt, readtcp, writetcp);
	xprt->xp_p2 = NULL;
	xprt->xp_p1 = (caddr_t)cd;
	xprt->xp_verf.oa_base = cd->verf_body;
	xprt->xp_addrlen = 0;
	xprt->xp_ops = &svctcp_op;  /* truely deals with calls */
	xprt->xp_port = 0;  /* this is a connection, not a rendezvouser */
	xprt->xp_sock = fd;
	xprt_register(xprt);
    done:
	return (xprt);
}

static bool_t
rendezvous_request(xprt)
	register SVCXPRT *xprt;
{
	int sock;
	struct tcp_rendezvous *r;
	struct sockaddr_in addr;
	int len;

	r = (struct tcp_rendezvous *)xprt->xp_p1;
    again:
	len = sizeof(struct sockaddr_in);
	if ((sock = accept(xprt->xp_sock, (struct sockaddr *)&addr,
	    &len)) < 0) {
		if (errno == EINTR)
			goto again;
	       return (FALSE);
	}
	/*
	 * make a new transporter (re-uses xprt)
	 */
	xprt = makefd_xprt(sock, r->sendsize, r->recvsize);
	xprt->xp_raddr = addr;
	xprt->xp_addrlen = len;
	return (FALSE); /* there is never an rpc msg to be processed */
}

static enum xprt_stat
rendezvous_stat()
{

	return (XPRT_IDLE);
}

static void
svctcp_destroy(xprt)
	register SVCXPRT *xprt;
{
	register struct tcp_conn *cd = (struct tcp_conn *)xprt->xp_p1;

	xprt_unregister(xprt);
	(void)close(xprt->xp_sock);
	if (xprt->xp_port != 0) {
		/* a rendezvouser socket */
		xprt->xp_port = 0;
	} else {
		/* an actual connection socket */
		XDR_DESTROY(&(cd->xdrs));
	}
	mem_free((caddr_t)cd, sizeof(struct tcp_conn));
	mem_free((caddr_t)xprt, sizeof(SVCXPRT));
}

/*
 * All read operations timeout after 35 seconds.
 * A timeout is fatal for the connection.
 */
static struct timeval wait_per_try = { 35, 0 };

/*
 * reads data from the tcp conection.
 * any error is fatal and the connection is closed.
 * (And a read of zero bytes is a half closed stream => error.)
 */
static int
readtcp(xprt, buf, len)
	register SVCXPRT *xprt;
	caddr_t buf;
	register int len;
{
	register int sock = xprt->xp_sock;
#ifdef FD_SETSIZE
	fd_set mask;
	fd_set readfds;

	FD_ZERO(&mask);
	FD_SET(sock, &mask);
#else
	register int mask = 1 << sock;
	int readfds;
#endif /* def FD_SETSIZE */
	do {
		readfds = mask;
		if (select(_rpc_dtablesize(), &readfds, (int*)NULL, (int*)NULL, 
			   &wait_per_try) <= 0) {
			if (errno == EINTR) {
				continue;
			}
			goto fatal_err;
		}
#ifdef FD_SETSIZE
	} while (!FD_ISSET(sock, &readfds));
#else
	} while (readfds != mask);
#endif /* def FD_SETSIZE */
	if ((len = read(sock, buf, len)) > 0) {
		return (len);
	}
fatal_err:
	((struct tcp_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
	return (-1);
}

/*
 * writes data to the tcp connection.
 * Any error is fatal and the connection is closed.
 */
static int
writetcp(xprt, buf, len)
	register SVCXPRT *xprt;
	caddr_t buf;
	int len;
{
	register int i, cnt;

	for (cnt = len; cnt > 0; cnt -= i, buf += i) {
		if ((i = write(xprt->xp_sock, buf, cnt)) < 0) {
			((struct tcp_conn *)(xprt->xp_p1))->strm_stat =
			    XPRT_DIED;
			return (-1);
		}
	}
	return (len);
}

static enum xprt_stat
svctcp_stat(xprt)
	SVCXPRT *xprt;
{
	register struct tcp_conn *cd =
	    (struct tcp_conn *)(xprt->xp_p1);

	if (cd->strm_stat == XPRT_DIED)
		return (XPRT_DIED);
	if (! xdrrec_eof(&(cd->xdrs)))
		return (XPRT_MOREREQS);
	return (XPRT_IDLE);
}

static bool_t
svctcp_recv(xprt, msg)
	SVCXPRT *xprt;
	register struct rpc_msg *msg;
{
	register struct tcp_conn *cd =
	    (struct tcp_conn *)(xprt->xp_p1);
	register XDR *xdrs = &(cd->xdrs);

	xdrs->x_op = XDR_DECODE;
	(void)xdrrec_skiprecord(xdrs);
	if (xdr_callmsg(xdrs, msg)) {
		cd->x_id = msg->rm_xid;
		return (TRUE);
	}
	return (FALSE);
}

static bool_t
svctcp_getargs(xprt, xdr_args, args_ptr)
	SVCXPRT *xprt;
	xdrproc_t xdr_args;
	caddr_t args_ptr;
{

	return ((*xdr_args)(&(((struct tcp_conn *)(xprt->xp_p1))->xdrs), args_ptr));
}

static bool_t
svctcp_freeargs(xprt, xdr_args, args_ptr)
	SVCXPRT *xprt;
	xdrproc_t xdr_args;
	caddr_t args_ptr;
{
	register XDR *xdrs =
	    &(((struct tcp_conn *)(xprt->xp_p1))->xdrs);

	xdrs->x_op = XDR_FREE;
	return ((*xdr_args)(xdrs, args_ptr));
}

static bool_t
svctcp_reply(xprt, msg)
	SVCXPRT *xprt;
	register struct rpc_msg *msg;
{
	register struct tcp_conn *cd =
	    (struct tcp_conn *)(xprt->xp_p1);
	register XDR *xdrs = &(cd->xdrs);
	register bool_t stat;

	xdrs->x_op = XDR_ENCODE;
	msg->rm_xid = cd->x_id;
	stat = xdr_replymsg(xdrs, msg);
	(void)xdrrec_endofrecord(xdrs, TRUE);
	return (stat);
}
Commit	Line	Data
15637ed4 RG	1	/* @(#)svc_tcp.c 2.2 88/08/01 4.0 RPCSRC */
	2	/*
	3	* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
	4	* unrestricted use provided that this legend is included on all tape
	5	* media and as a part of the software program in whole or part. Users
	6	* may copy or modify Sun RPC without charge, but are not authorized
	7	* to license or distribute it to anyone else except as part of a product or
	8	* program developed by the user.
	9	*
	10	* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
	11	* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
	12	* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
	13	*
	14	* Sun RPC is provided with no support and without any obligation on the
	15	* part of Sun Microsystems, Inc. to assist in its use, correction,
	16	* modification or enhancement.
	17	*
	18	* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
	19	* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
	20	* OR ANY PART THEREOF.
	21	*
	22	* In no event will Sun Microsystems, Inc. be liable for any lost revenue
	23	* or profits or other special, indirect and consequential damages, even if
	24	* Sun has been advised of the possibility of such damages.
	25	*
	26	* Sun Microsystems, Inc.
	27	* 2550 Garcia Avenue
	28	* Mountain View, California 94043
	29	*/
	30	#if !defined(lint) && defined(SCCSIDS)
	31	static char sccsid[] = "@(#)svc_tcp.c 1.21 87/08/11 Copyr 1984 Sun Micro";
	32	#endif
	33
	34	/*
	35	* svc_tcp.c, Server side for TCP/IP based RPC.
	36	*
	37	* Copyright (C) 1984, Sun Microsystems, Inc.
	38	*
	39	* Actually implements two flavors of transporter -
	40	* a tcp rendezvouser (a listner and connection establisher)
	41	* and a record/tcp stream.
	42	*/
	43
	44	#include <stdio.h>
	45	#include <rpc/rpc.h>
	46	#include <sys/socket.h>
	47	#include <errno.h>
	48	extern bool_t abort();
	49	extern errno;
	50
	51	/*
	52	* Ops vector for TCP/IP based rpc service handle
	53	*/
	54	static bool_t svctcp_recv();
	55	static enum xprt_stat svctcp_stat();
	56	static bool_t svctcp_getargs();
	57	static bool_t svctcp_reply();
	58	static bool_t svctcp_freeargs();
	59	static void svctcp_destroy();
	60
	61	static struct xp_ops svctcp_op = {
	62	svctcp_recv,
	63	svctcp_stat,
	64	svctcp_getargs,
65	svctcp_reply,
66	svctcp_freeargs,
67	svctcp_destroy
68	};
69
70	/*
71	* Ops vector for TCP/IP rendezvous handler
72	*/
73	static bool_t rendezvous_request();
74	static enum xprt_stat rendezvous_stat();
75
76	static struct xp_ops svctcp_rendezvous_op = {
77	rendezvous_request,
78	rendezvous_stat,
79	abort,
80	abort,
81	abort,
82	svctcp_destroy
83	};
84
85	static int readtcp(), writetcp();
86	static SVCXPRT *makefd_xprt();
87
88	struct tcp_rendezvous { /* kept in xprt->xp_p1 */
89	u_int sendsize;
90	u_int recvsize;
91	};
92
93	struct tcp_conn { /* kept in xprt->xp_p1 */
94	enum xprt_stat strm_stat;
95	u_long x_id;
96	XDR xdrs;
97	char verf_body[MAX_AUTH_BYTES];
98	};
99
100	/*
101	* Usage:
102	* xprt = svctcp_create(sock, send_buf_size, recv_buf_size);
103	*
104	* Creates, registers, and returns a (rpc) tcp based transporter.
105	* Once *xprt is initialized, it is registered as a transporter
106	* see (svc.h, xprt_register). This routine returns
107	* a NULL if a problem occurred.
108	*
109	* If sock<0 then a socket is created, else sock is used.
110	* If the socket, sock is not bound to a port then svctcp_create
111	* binds it to an arbitrary port. The routine then starts a tcp
112	* listener on the socket's associated port. In any (successful) case,
113	* xprt->xp_sock is the registered socket number and xprt->xp_port is the
114	* associated port number.
115	*
116	* Since tcp streams do buffered io similar to stdio, the caller can specify
117	* how big the send and receive buffers are via the second and third parms;
118	* 0 => use the system default.
119	*/
120	SVCXPRT *
121	svctcp_create(sock, sendsize, recvsize)
122	register int sock;
123	u_int sendsize;
124	u_int recvsize;
125	{
126	bool_t madesock = FALSE;
127	register SVCXPRT *xprt;
128	register struct tcp_rendezvous *r;
129	struct sockaddr_in addr;
130	int len = sizeof(struct sockaddr_in);
131
132	if (sock == RPC_ANYSOCK) {
133	if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
134	perror("svctcp_.c - udp socket creation problem");
135	return ((SVCXPRT *)NULL);
136	}
137	madesock = TRUE;
138	}
139	bzero((char *)&addr, sizeof (addr));
140	addr.sin_family = AF_INET;
141	if (bindresvport(sock, &addr)) {
142	addr.sin_port = 0;
143	(void)bind(sock, (struct sockaddr *)&addr, len);
144	}
145	if ((getsockname(sock, (struct sockaddr *)&addr, &len) != 0) \|\|
146	(listen(sock, 2) != 0)) {
147	perror("svctcp_.c - cannot getsockname or listen");
148	if (madesock)
149	(void)close(sock);
150	return ((SVCXPRT *)NULL);
151	}
152	r = (struct tcp_rendezvous )mem_alloc(sizeof(r));
153	if (r == NULL) {
154	(void) fprintf(stderr, "svctcp_create: out of memory\n");
155	return (NULL);
156	}
157	r->sendsize = sendsize;
158	r->recvsize = recvsize;
159	xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
160	if (xprt == NULL) {
161	(void) fprintf(stderr, "svctcp_create: out of memory\n");
162	return (NULL);
163	}
164	xprt->xp_p2 = NULL;
165	xprt->xp_p1 = (caddr_t)r;
166	xprt->xp_verf = _null_auth;
167	xprt->xp_ops = &svctcp_rendezvous_op;
168	xprt->xp_port = ntohs(addr.sin_port);
169	xprt->xp_sock = sock;
170	xprt_register(xprt);
171	return (xprt);
172	}
173
174	/*
175	* Like svtcp_create(), except the routine takes any open UNIX file
176	* descriptor as its first input.
177	*/
178	SVCXPRT *
179	svcfd_create(fd, sendsize, recvsize)
180	int fd;
181	u_int sendsize;
182	u_int recvsize;
183	{
184
185	return (makefd_xprt(fd, sendsize, recvsize));
186	}
187
188	static SVCXPRT *
189	makefd_xprt(fd, sendsize, recvsize)
190	int fd;
191	u_int sendsize;
192	u_int recvsize;
193	{
194	register SVCXPRT *xprt;
195	register struct tcp_conn *cd;
196
197	xprt = (SVCXPRT *)mem_alloc(sizeof(SVCXPRT));
198	if (xprt == (SVCXPRT *)NULL) {
199	(void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n");
200	goto done;
201	}
202	cd = (struct tcp_conn *)mem_alloc(sizeof(struct tcp_conn));
203	if (cd == (struct tcp_conn *)NULL) {
204	(void) fprintf(stderr, "svc_tcp: makefd_xprt: out of memory\n");
205	mem_free((char *) xprt, sizeof(SVCXPRT));
206	xprt = (SVCXPRT *)NULL;
207	goto done;
208	}
209	cd->strm_stat = XPRT_IDLE;
210	xdrrec_create(&(cd->xdrs), sendsize, recvsize,
211	(caddr_t)xprt, readtcp, writetcp);
212	xprt->xp_p2 = NULL;
213	xprt->xp_p1 = (caddr_t)cd;
214	xprt->xp_verf.oa_base = cd->verf_body;
215	xprt->xp_addrlen = 0;
216	xprt->xp_ops = &svctcp_op; /* truely deals with calls */
217	xprt->xp_port = 0; /* this is a connection, not a rendezvouser */
218	xprt->xp_sock = fd;
219	xprt_register(xprt);
220	done:
221	return (xprt);
222	}
223
224	static bool_t
225	rendezvous_request(xprt)
226	register SVCXPRT *xprt;
227	{
228	int sock;
229	struct tcp_rendezvous *r;
230	struct sockaddr_in addr;
231	int len;
232
233	r = (struct tcp_rendezvous *)xprt->xp_p1;
234	again:
235	len = sizeof(struct sockaddr_in);
236	if ((sock = accept(xprt->xp_sock, (struct sockaddr *)&addr,
237	&len)) < 0) {
238	if (errno == EINTR)
239	goto again;
240	return (FALSE);
241	}
242	/*
243	* make a new transporter (re-uses xprt)
244	*/
245	xprt = makefd_xprt(sock, r->sendsize, r->recvsize);
246	xprt->xp_raddr = addr;
247	xprt->xp_addrlen = len;
248	return (FALSE); /* there is never an rpc msg to be processed */
249	}
250
251	static enum xprt_stat
252	rendezvous_stat()
253	{
254
255	return (XPRT_IDLE);
256	}
257
258	static void
259	svctcp_destroy(xprt)
260	register SVCXPRT *xprt;
261	{
262	register struct tcp_conn cd = (struct tcp_conn )xprt->xp_p1;
263
264	xprt_unregister(xprt);
265	(void)close(xprt->xp_sock);
266	if (xprt->xp_port != 0) {
267	/* a rendezvouser socket */
268	xprt->xp_port = 0;
269	} else {
270	/* an actual connection socket */
271	XDR_DESTROY(&(cd->xdrs));
272	}
273	mem_free((caddr_t)cd, sizeof(struct tcp_conn));
274	mem_free((caddr_t)xprt, sizeof(SVCXPRT));
275	}
276
277	/*
278	* All read operations timeout after 35 seconds.
279	* A timeout is fatal for the connection.
280	*/
281	static struct timeval wait_per_try = { 35, 0 };
282
283	/*
284	* reads data from the tcp conection.
285	* any error is fatal and the connection is closed.
286	* (And a read of zero bytes is a half closed stream => error.)
287	*/
288	static int
289	readtcp(xprt, buf, len)
290	register SVCXPRT *xprt;
291	caddr_t buf;
292	register int len;
293	{
294	register int sock = xprt->xp_sock;
295	#ifdef FD_SETSIZE
296	fd_set mask;
297	fd_set readfds;
298
299	FD_ZERO(&mask);
300	FD_SET(sock, &mask);
301	#else
302	register int mask = 1 << sock;
303	int readfds;
304	#endif /* def FD_SETSIZE */
305	do {
306	readfds = mask;
307	if (select(_rpc_dtablesize(), &readfds, (int)NULL, (int)NULL,
308	&wait_per_try) <= 0) {
309	if (errno == EINTR) {
310	continue;
311	}
312	goto fatal_err;
313	}
314	#ifdef FD_SETSIZE
315	} while (!FD_ISSET(sock, &readfds));
316	#else
317	} while (readfds != mask);
318	#endif /* def FD_SETSIZE */
319	if ((len = read(sock, buf, len)) > 0) {
320	return (len);
321	}
322	fatal_err:
323	((struct tcp_conn *)(xprt->xp_p1))->strm_stat = XPRT_DIED;
324	return (-1);
325	}
326
327	/*
328	* writes data to the tcp connection.
329	* Any error is fatal and the connection is closed.
330	*/
331	static int
332	writetcp(xprt, buf, len)
333	register SVCXPRT *xprt;
334	caddr_t buf;
335	int len;
336	{
337	register int i, cnt;
338
339	for (cnt = len; cnt > 0; cnt -= i, buf += i) {
340	if ((i = write(xprt->xp_sock, buf, cnt)) < 0) {
341	((struct tcp_conn *)(xprt->xp_p1))->strm_stat =
342	XPRT_DIED;
343	return (-1);
344	}
345	}
346	return (len);
347	}
348
349	static enum xprt_stat
350	svctcp_stat(xprt)
351	SVCXPRT *xprt;
352	{
353	register struct tcp_conn *cd =
354	(struct tcp_conn *)(xprt->xp_p1);
355
356	if (cd->strm_stat == XPRT_DIED)
357	return (XPRT_DIED);
358	if (! xdrrec_eof(&(cd->xdrs)))
359	return (XPRT_MOREREQS);
360	return (XPRT_IDLE);
361	}
362
363	static bool_t
364	svctcp_recv(xprt, msg)
365	SVCXPRT *xprt;
366	register struct rpc_msg *msg;
367	{
368	register struct tcp_conn *cd =
369	(struct tcp_conn *)(xprt->xp_p1);
370	register XDR *xdrs = &(cd->xdrs);
371
372	xdrs->x_op = XDR_DECODE;
373	(void)xdrrec_skiprecord(xdrs);
374	if (xdr_callmsg(xdrs, msg)) {
375	cd->x_id = msg->rm_xid;
376	return (TRUE);
377	}
378	return (FALSE);
379	}
380
381	static bool_t
382	svctcp_getargs(xprt, xdr_args, args_ptr)
383	SVCXPRT *xprt;
384	xdrproc_t xdr_args;
385	caddr_t args_ptr;
386	{
387
388	return ((xdr_args)(&(((struct tcp_conn )(xprt->xp_p1))->xdrs), args_ptr));
389	}
390
391	static bool_t
392	svctcp_freeargs(xprt, xdr_args, args_ptr)
393	SVCXPRT *xprt;
394	xdrproc_t xdr_args;
395	caddr_t args_ptr;
396	{
397	register XDR *xdrs =
398	&(((struct tcp_conn *)(xprt->xp_p1))->xdrs);
399
400	xdrs->x_op = XDR_FREE;
401	return ((*xdr_args)(xdrs, args_ptr));
402	}
403
404	static bool_t
405	svctcp_reply(xprt, msg)
406	SVCXPRT *xprt;
407	register struct rpc_msg *msg;
408	{
409	register struct tcp_conn *cd =
410	(struct tcp_conn *)(xprt->xp_p1);
411	register XDR *xdrs = &(cd->xdrs);
412	register bool_t stat;
413
414	xdrs->x_op = XDR_ENCODE;
415	msg->rm_xid = cd->x_id;
416	stat = xdr_replymsg(xdrs, msg);
417	(void)xdrrec_endofrecord(xdrs, TRUE);
418	return (stat);
419	}