/* * 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 #include #include #include #include #include #include #define _SUN_TPI_VERSION 2 #include #include #include #include #include #include #include #include #include #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); }