10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25 
  26 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T     */
  27 /*        All Rights Reserved   */
  28 
  29 
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31 
  32 #include <sys/types.h>
  33 #include <sys/sysmacros.h>
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/file.h>
  37 #include <sys/vnode.h>
  38 #include <sys/errno.h>
  39 #include <sys/signal.h>
  40 #include <sys/cred.h>
  41 #include <sys/policy.h>
  42 #include <sys/conf.h>
  43 #include <sys/debug.h>
  44 #include <sys/proc.h>
  45 #include <sys/session.h>
  46 #include <sys/kmem.h>
  47 #include <sys/cmn_err.h>
  48 #include <sys/strsubr.h>
  49 #include <sys/fs/snode.h>
  50 
  51 sess_t session0 = {
  52         &pid0,              /* s_sidp */
  53         {0},            /* s_lock */
  54         1,              /* s_ref */
  55         B_FALSE,        /* s_sighuped */
  56         B_FALSE,        /* s_exit */
  57         0,              /* s_exit_cv */
  58         0,              /* s_cnt */
  59         0,              /* s_cnt_cv */
  60         NODEV,          /* s_dev */
  61         NULL,           /* s_vp */
  62         NULL            /* s_cred */
  63 };
  64 
  65 void
  66 sess_hold(proc_t *p)
  67 {
  68         ASSERT(MUTEX_HELD(&pidlock) || MUTEX_HELD(&p->p_splock));
  69         mutex_enter(&p->p_sessp->s_lock);
  70         p->p_sessp->s_ref++;
  71         mutex_exit(&p->p_sessp->s_lock);
  72 }
  73 
  74 void
  75 sess_rele(sess_t *sp, boolean_t pidlock_held)
  76 {
  77         ASSERT(MUTEX_HELD(&pidlock) || !pidlock_held);
  78 
  79         mutex_enter(&sp->s_lock);

  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25 
  26 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T     */
  27 /*        All Rights Reserved   */
  28 
  29 


  30 #include <sys/types.h>
  31 #include <sys/sysmacros.h>
  32 #include <sys/param.h>
  33 #include <sys/systm.h>
  34 #include <sys/file.h>
  35 #include <sys/vnode.h>
  36 #include <sys/errno.h>
  37 #include <sys/signal.h>
  38 #include <sys/cred.h>
  39 #include <sys/policy.h>
  40 #include <sys/conf.h>
  41 #include <sys/debug.h>
  42 #include <sys/proc.h>
  43 #include <sys/session.h>
  44 #include <sys/kmem.h>
  45 #include <sys/cmn_err.h>
  46 #include <sys/strsubr.h>
  47 #include <sys/fs/snode.h>
  48 
  49 sess_t session0 = {
  50         &pid0,              /* s_sidp */
  51         {{NULL}},       /* s_lock */
  52         1,              /* s_ref */
  53         B_FALSE,        /* s_sighuped */
  54         B_FALSE,        /* s_exit */
  55         {0},            /* s_exit_cv */
  56         0,              /* s_cnt */
  57         {0},            /* s_cnt_cv */
  58         NODEV,          /* s_dev */
  59         NULL,           /* s_vp */
  60         NULL            /* s_cred */
  61 };
  62 
  63 void
  64 sess_hold(proc_t *p)
  65 {
  66         ASSERT(MUTEX_HELD(&pidlock) || MUTEX_HELD(&p->p_splock));
  67         mutex_enter(&p->p_sessp->s_lock);
  68         p->p_sessp->s_ref++;
  69         mutex_exit(&p->p_sessp->s_lock);
  70 }
  71 
  72 void
  73 sess_rele(sess_t *sp, boolean_t pidlock_held)
  74 {
  75         ASSERT(MUTEX_HELD(&pidlock) || !pidlock_held);
  76 
  77         mutex_enter(&sp->s_lock);