OpenSolaris_b135/lib/libnsl/nsl/t_snd.c
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.3.1.2 */
/*
* t_snd.c and t_sndv.c are very similar and contain common code.
* Any changes to either of them should be reviewed to see whether they
* are applicable to the other file.
*/
#include "mt.h"
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <stropts.h>
#include <sys/stream.h>
#define _SUN_TPI_VERSION 2
#include <sys/tihdr.h>
#include <sys/timod.h>
#include <xti.h>
#include <syslog.h>
#include "tx.h"
int
_tx_snd(int fd, char *buf, unsigned nbytes, int flags, int api_semantics)
{
struct T_data_req datareq;
struct strbuf ctlbuf, databuf;
unsigned int bytes_sent, bytes_remaining, bytes_to_send;
char *curptr;
struct _ti_user *tiptr;
int band;
int retval, lookevent;
int sv_errno;
int doputmsg = 0;
int32_t tsdu_limit;
if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == NULL)
return (-1);
sig_mutex_lock(&tiptr->ti_lock);
if (tiptr->ti_servtype == T_CLTS) {
t_errno = TNOTSUPPORT;
sig_mutex_unlock(&tiptr->ti_lock);
return (-1);
}
if (_T_IS_XTI(api_semantics)) {
/*
* User level state verification only done for XTI
* because doing for TLI may break existing applications
*/
if (! (tiptr->ti_state == T_DATAXFER ||
tiptr->ti_state == T_INREL)) {
t_errno = TOUTSTATE;
sig_mutex_unlock(&tiptr->ti_lock);
return (-1);
}
/*
* XXX
* Is it OK to do this TBADFLAG check when XTI spec
* is being extended with new and interesting flags
* everyday ?
*/
if ((flags & ~(TX_ALL_VALID_FLAGS)) != 0) {
t_errno = TBADFLAG;
sig_mutex_unlock(&tiptr->ti_lock);
return (-1);
}
if (flags & T_EXPEDITED)
tsdu_limit = tiptr->ti_etsdusize;
else {
/* normal data */
tsdu_limit = tiptr->ti_tsdusize;
}
if ((tsdu_limit > 0) && /* limit meaningful and ... */
(nbytes > (uint32_t)tsdu_limit)) {
t_errno = TBADDATA;
sig_mutex_unlock(&tiptr->ti_lock);
return (-1);
}
/*
* Check for incoming disconnect or orderly release
* Did anyone say "performance" ? Didn't hear that.
*/
lookevent = _t_look_locked(fd, tiptr, 0, api_semantics);
if (lookevent < 0) {
sv_errno = errno;
sig_mutex_unlock(&tiptr->ti_lock);
errno = sv_errno;
return (-1);
}
/*
* XNS 4 required the TLOOK error to be returned if there
* is any incoming T_ORDREL. XNS 5 does not require an
* error to be returned in such a case.
*/
if (lookevent == T_DISCONNECT ||
(api_semantics == TX_XTI_XNS4_API &&
lookevent == T_ORDREL)) {
t_errno = TLOOK;
sig_mutex_unlock(&tiptr->ti_lock);
return (-1);
}
}
/* sending zero length data when not allowed */
if (nbytes == 0 && !(tiptr->ti_prov_flag & (SENDZERO|OLD_SENDZERO))) {
t_errno = TBADDATA;
sig_mutex_unlock(&tiptr->ti_lock);
return (-1);
}
doputmsg = (tiptr->ti_tsdusize != 0) || (flags & T_EXPEDITED);
if (doputmsg) {
/*
* Initialize ctlbuf for use in sending/receiving control part
* of the message.
*/
ctlbuf.maxlen = (int)sizeof (struct T_data_req);
ctlbuf.len = (int)sizeof (struct T_data_req);
ctlbuf.buf = (char *)&datareq;
band = TI_NORMAL; /* band 0 */
if (flags & T_EXPEDITED) {
datareq.PRIM_type = T_EXDATA_REQ;
if (! (tiptr->ti_prov_flag & EXPINLINE))
band = TI_EXPEDITED; /* band > 0 */
} else
datareq.PRIM_type = T_DATA_REQ;
}
bytes_remaining = nbytes;
curptr = buf;
/*
* Calls to send data (write or putmsg) can potentially
* block, for MT case, we drop the lock and enable signals here
* and acquire it back
*/
sig_mutex_unlock(&tiptr->ti_lock);
do {
bytes_to_send = bytes_remaining;
if (doputmsg) {
/*
* transport provider supports TSDU concept
* (unlike TCP) or it is expedited data.
* In this case do the fragmentation
*/
if (bytes_to_send > (unsigned int)tiptr->ti_maxpsz) {
datareq.MORE_flag = 1;
bytes_to_send = (unsigned int)tiptr->ti_maxpsz;
} else {
if (flags&T_MORE)
datareq.MORE_flag = 1;
else
datareq.MORE_flag = 0;
}
databuf.maxlen = bytes_to_send;
databuf.len = bytes_to_send;
databuf.buf = curptr;
retval = putpmsg(fd, &ctlbuf, &databuf, band, MSG_BAND);
if (retval == 0)
bytes_sent = bytes_to_send;
} else {
/*
* transport provider does *not* support TSDU concept
* (e.g. TCP) and it is not expedited data. A
* perf. optimization is used. Note: the T_MORE
* flag is ignored here even if set by the user.
*/
retval = write(fd, curptr, bytes_to_send);
if (retval >= 0) {
/* Amount that was actually sent */
bytes_sent = retval;
}
}
if (retval < 0) {
if (nbytes == bytes_remaining) {
/*
* Error on *first* putmsg/write attempt.
* Return appropriate error
*/
if (errno == EAGAIN)
t_errno = TFLOW;
else
t_errno = TSYSERR;
return (-1); /* return error */
}
/*
* Not the first putmsg/write
* [ partial completion of t_snd() case.
*
* Error on putmsg/write attempt but
* some data was transmitted so don't
* return error. Don't attempt to
* send more (break from loop) but
* return OK.
*/
break;
}
bytes_remaining = bytes_remaining - bytes_sent;
curptr = curptr + bytes_sent;
} while (bytes_remaining != 0);
_T_TX_NEXTSTATE(T_SND, tiptr, "t_snd: invalid state event T_SND");
return (nbytes - bytes_remaining);
}