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/*
* 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 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.5.3.3 */
#include "mt.h"
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <unistd.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 <sys/stat.h>
#include <xti.h>
#include <fcntl.h>
#include <signal.h>
#include <assert.h>
#include <syslog.h>
#include <limits.h>
#include "tx.h"
/*
* If _tx_open is called for transport that doesn't understand T_CAPABILITY_REQ
* TPI message, call to _t_create may fail the first time it is called with
* given transport (in the rare case when transport shuts down the stream with
* M_ERROR in reply to unknown T_CAPABILITY_REQ). In this case we may reopen the
* stream again since timod will emulate T_CAPABILITY_REQ behaviour.
*
* _t_create sends T_CAPABILITY_REQ through TI_CAPABILITY ioctl.
*/
int
_tx_open(const char *path, int flags, struct t_info *info, int api_semantics)
{
int retval, fd, sv_errno;
int sv_terrno;
int sv_errno_global;
struct _ti_user *tiptr;
sigset_t mask;
int t_create_first_attempt = 1;
int ticap_ioctl_failed = 0;
if (!(flags & O_RDWR)) {
t_errno = TBADFLAG;
return (-1);
}
sv_errno_global = errno;
sv_terrno = t_errno;
retry:
if ((fd = open(path, flags)) < 0) {
t_errno = TSYSERR;
if (_T_IS_XTI(api_semantics) && errno == ENOENT)
/* XTI only */
t_errno = TBADNAME;
return (-1);
}
/*
* is module already pushed
*/
do {
retval = ioctl(fd, I_FIND, "timod");
} while (retval < 0 && errno == EINTR);
if (retval < 0) {
sv_errno = errno;
t_errno = TSYSERR;
(void) close(fd);
errno = sv_errno;
return (-1);
}
if (retval == 0) {
/*
* "timod" not already on stream, then push it
*/
do {
/*
* Assumes (correctly) that I_PUSH is
* atomic w.r.t signals (EINTR error)
*/
retval = ioctl(fd, I_PUSH, "timod");
} while (retval < 0 && errno == EINTR);
if (retval < 0) {
int sv_errno = errno;
t_errno = TSYSERR;
(void) close(fd);
errno = sv_errno;
return (-1);
}
}
/*
* _t_create() requires that all signals be blocked.
* Note that sig_mutex_lock() only defers signals, it does not
* block them, so interruptible syscalls could still get EINTR.
*/
(void) thr_sigsetmask(SIG_SETMASK, &fillset, &mask);
sig_mutex_lock(&_ti_userlock);
/*
* Call to _t_create may fail either because transport doesn't
* understand T_CAPABILITY_REQ or for some other reason. It is nearly
* impossible to distinguish between these cases so it is implicitly
* assumed that it is always save to close and reopen the same stream
* and that open/close doesn't have side effects. _t_create may fail
* only once if its' failure is caused by unimplemented
* T_CAPABILITY_REQ.
*/
tiptr = _t_create(fd, info, api_semantics, &ticap_ioctl_failed);
if (tiptr == NULL) {
/*
* If _t_create failed due to fail of ti_capability_req we may
* try to reopen the stream in the hope that timod will emulate
* TI_CAPABILITY and it will succeed when called again.
*/
if (t_create_first_attempt == 1 && ticap_ioctl_failed == 1) {
t_create_first_attempt = 0;
(void) close(fd);
errno = sv_errno_global;
t_errno = sv_terrno;
sig_mutex_unlock(&_ti_userlock);
(void) thr_sigsetmask(SIG_SETMASK, &mask, NULL);
goto retry;
} else {
int sv_errno = errno;
(void) close(fd);
sig_mutex_unlock(&_ti_userlock);
(void) thr_sigsetmask(SIG_SETMASK, &mask, NULL);
errno = sv_errno;
return (-1);
}
}
/*
* _t_create synchronizes state witk kernel timod and
* already sets it to T_UNBND - what it needs to be
* be on T_OPEN event. No _T_TX_NEXTSTATE needed here.
*/
sig_mutex_unlock(&_ti_userlock);
(void) thr_sigsetmask(SIG_SETMASK, &mask, NULL);
do {
retval = ioctl(fd, I_FLUSH, FLUSHRW);
} while (retval < 0 && errno == EINTR);
/*
* We ignore other error cases (retval < 0) - assumption is
* that I_FLUSH failures is temporary (e.g. ENOSR) or
* otherwise benign failure on a this newly opened file
* descriptor and not a critical failure.
*/
return (fd);
}
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