usr/src/lib/libc/port/nsl/t_close.c

   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 1.5 */
  32
  33 #include "mt.h"
  34 #include <errno.h>
  35 #include <unistd.h>
  36 #include <xti.h>
  37 #include <signal.h>
  38 #include <stropts.h>
  39 #include "tx.h"
  40
  41 int
  42 _tx_close(int fd, int api_semantics)
  43 {
  44         sigset_t mask;
  45         int sv_errno;
  46
  47         if (_t_checkfd(fd, 0, api_semantics) == NULL)
  48                 return (-1);
  49
  50         (void) thr_sigsetmask(SIG_SETMASK, &fillset, &mask);
  51         sig_mutex_lock(&_ti_userlock);
  52         if (_t_delete_tilink(fd) < 0) {
  53                 sv_errno = errno;
  54                 sig_mutex_unlock(&_ti_userlock);
  55                 (void) thr_sigsetmask(SIG_SETMASK, &mask, NULL);
  56                 errno = sv_errno;
  57                 return (-1);
  58         }
  59         /*
  60          * Note: close() needs to be inside the lock. If done
  61          * outside, another process may inherit the desriptor
  62          * and recreate library level instance structures
  63          */
  64         (void) close(fd);
  65
  66         sig_mutex_unlock(&_ti_userlock);
  67         (void) thr_sigsetmask(SIG_SETMASK, &mask, NULL);
  68         return (0);
  69 }