1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22
23 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
24 /* All Rights Reserved */
25
26 /*
27 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
28 * Use is subject to license terms.
29 */
30
31 #pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.3.1.2 */
32
33 /*
34 * t_snd.c and t_sndv.c are very similar and contain common code.
35 * Any changes to either of them should be reviewed to see whether they
36 * are applicable to the other file.
37 */
38 #include "mt.h"
39 #include <unistd.h>
40 #include <stdlib.h>
41 #include <errno.h>
42 #include <stropts.h>
43 #include <sys/stream.h>
44 #define _SUN_TPI_VERSION 2
45 #include <sys/tihdr.h>
46 #include <sys/timod.h>
47 #include <xti.h>
48 #include <syslog.h>
49 #include "tx.h"
50
51
52 int
_tx_snd(int fd,char * buf,unsigned nbytes,int flags,int api_semantics)53 _tx_snd(int fd, char *buf, unsigned nbytes, int flags, int api_semantics)
54 {
55 struct T_data_req datareq;
56 struct strbuf ctlbuf, databuf;
57 unsigned int bytes_sent, bytes_remaining, bytes_to_send;
58 char *curptr;
59 struct _ti_user *tiptr;
60 int band;
61 int retval, lookevent;
62 int sv_errno;
63 int doputmsg = 0;
64 int32_t tsdu_limit;
65
66 if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == NULL)
67 return (-1);
68 sig_mutex_lock(&tiptr->ti_lock);
69
70 if (tiptr->ti_servtype == T_CLTS) {
71 t_errno = TNOTSUPPORT;
72 sig_mutex_unlock(&tiptr->ti_lock);
73 return (-1);
74 }
75
76 if (_T_IS_XTI(api_semantics)) {
77 /*
78 * User level state verification only done for XTI
79 * because doing for TLI may break existing applications
80 */
81 if (! (tiptr->ti_state == T_DATAXFER ||
82 tiptr->ti_state == T_INREL)) {
83 t_errno = TOUTSTATE;
84 sig_mutex_unlock(&tiptr->ti_lock);
85 return (-1);
86 }
87 /*
88 * XXX
89 * Is it OK to do this TBADFLAG check when XTI spec
90 * is being extended with new and interesting flags
91 * everyday ?
92 */
93 if ((flags & ~(TX_ALL_VALID_FLAGS)) != 0) {
94 t_errno = TBADFLAG;
95 sig_mutex_unlock(&tiptr->ti_lock);
96 return (-1);
97 }
98 if (flags & T_EXPEDITED)
99 tsdu_limit = tiptr->ti_etsdusize;
100 else {
101 /* normal data */
102 tsdu_limit = tiptr->ti_tsdusize;
103 }
104
105 if ((tsdu_limit > 0) && /* limit meaningful and ... */
106 (nbytes > (uint32_t)tsdu_limit)) {
107 t_errno = TBADDATA;
108 sig_mutex_unlock(&tiptr->ti_lock);
109 return (-1);
110 }
111
112 /*
113 * Check for incoming disconnect or orderly release
114 * Did anyone say "performance" ? Didn't hear that.
115 */
116 lookevent = _t_look_locked(fd, tiptr, 0, api_semantics);
117 if (lookevent < 0) {
118 sv_errno = errno;
119 sig_mutex_unlock(&tiptr->ti_lock);
120 errno = sv_errno;
121 return (-1);
122 }
123 /*
124 * XNS 4 required the TLOOK error to be returned if there
125 * is any incoming T_ORDREL. XNS 5 does not require an
126 * error to be returned in such a case.
127 */
128 if (lookevent == T_DISCONNECT ||
129 (api_semantics == TX_XTI_XNS4_API &&
130 lookevent == T_ORDREL)) {
131 t_errno = TLOOK;
132 sig_mutex_unlock(&tiptr->ti_lock);
133 return (-1);
134 }
135 }
136
137 /* sending zero length data when not allowed */
138 if (nbytes == 0 && !(tiptr->ti_prov_flag & (SENDZERO|OLD_SENDZERO))) {
139 t_errno = TBADDATA;
140 sig_mutex_unlock(&tiptr->ti_lock);
141 return (-1);
142 }
143
144 doputmsg = (tiptr->ti_tsdusize != 0) || (flags & T_EXPEDITED);
145
146 if (doputmsg) {
147 /*
148 * Initialize ctlbuf for use in sending/receiving control part
149 * of the message.
150 */
151 ctlbuf.maxlen = (int)sizeof (struct T_data_req);
152 ctlbuf.len = (int)sizeof (struct T_data_req);
153 ctlbuf.buf = (char *)&datareq;
154
155 band = TI_NORMAL; /* band 0 */
156 if (flags & T_EXPEDITED) {
157 datareq.PRIM_type = T_EXDATA_REQ;
158 if (! (tiptr->ti_prov_flag & EXPINLINE))
159 band = TI_EXPEDITED; /* band > 0 */
160 } else
161 datareq.PRIM_type = T_DATA_REQ;
162 }
163
164 bytes_remaining = nbytes;
165 curptr = buf;
166
167 /*
168 * Calls to send data (write or putmsg) can potentially
169 * block, for MT case, we drop the lock and enable signals here
170 * and acquire it back
171 */
172 sig_mutex_unlock(&tiptr->ti_lock);
173 do {
174 bytes_to_send = bytes_remaining;
175 if (doputmsg) {
176 /*
177 * transport provider supports TSDU concept
178 * (unlike TCP) or it is expedited data.
179 * In this case do the fragmentation
180 */
181 if (bytes_to_send > (unsigned int)tiptr->ti_maxpsz) {
182 datareq.MORE_flag = 1;
183 bytes_to_send = (unsigned int)tiptr->ti_maxpsz;
184 } else {
185 if (flags&T_MORE)
186 datareq.MORE_flag = 1;
187 else
188 datareq.MORE_flag = 0;
189 }
190 databuf.maxlen = bytes_to_send;
191 databuf.len = bytes_to_send;
192 databuf.buf = curptr;
193 retval = putpmsg(fd, &ctlbuf, &databuf, band, MSG_BAND);
194 if (retval == 0)
195 bytes_sent = bytes_to_send;
196 } else {
197 /*
198 * transport provider does *not* support TSDU concept
199 * (e.g. TCP) and it is not expedited data. A
200 * perf. optimization is used. Note: the T_MORE
201 * flag is ignored here even if set by the user.
202 */
203 retval = write(fd, curptr, bytes_to_send);
204 if (retval >= 0) {
205 /* Amount that was actually sent */
206 bytes_sent = retval;
207 }
208 }
209
210 if (retval < 0) {
211 if (nbytes == bytes_remaining) {
212 /*
213 * Error on *first* putmsg/write attempt.
214 * Return appropriate error
215 */
216 if (errno == EAGAIN)
217 t_errno = TFLOW;
218 else
219 t_errno = TSYSERR;
220 return (-1); /* return error */
221 }
222 /*
223 * Not the first putmsg/write
224 * [ partial completion of t_snd() case.
225 *
226 * Error on putmsg/write attempt but
227 * some data was transmitted so don't
228 * return error. Don't attempt to
229 * send more (break from loop) but
230 * return OK.
231 */
232 break;
233 }
234 bytes_remaining = bytes_remaining - bytes_sent;
235 curptr = curptr + bytes_sent;
236 } while (bytes_remaining != 0);
237
238 _T_TX_NEXTSTATE(T_SND, tiptr, "t_snd: invalid state event T_SND");
239 return (nbytes - bytes_remaining);
240 }
241