usr/src/cmd/mdb/common/modules/logindmux/logindmux.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 2003 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <mdb/mdb_modapi.h>
  30 #include <mdb/mdb_ks.h>
  31 #include <sys/logindmux_impl.h>
  32
  33 /*
  34  * Print our peer's upper queue pointer, and our lower queue pointer.
  35  */
  36 void
  37 logdmux_uqinfo(const queue_t *q, char *buf, size_t nbytes)
  38 {
  39         struct tmx tmx;
  40         uintptr_t peer, lower;
  41         queue_t lq;
  42
  43         /*
  44          * First, get the pointer to our lower write queue.
  45          */
  46         (void) mdb_vread(&tmx, sizeof (tmx), (uintptr_t)q->q_ptr);
  47         lower = (uintptr_t)tmx.muxq;
  48
  49         /*
  50          * Now read in the lower's peer, and follow that to up to our peer.
  51          */
  52         (void) mdb_vread(&lq, sizeof (lq), (uintptr_t)tmx.peerq);
  53         (void) mdb_vread(&tmx, sizeof (tmx), (uintptr_t)lq.q_ptr);
  54         peer = (uintptr_t)tmx.rdq;
  55
  56         (void) mdb_snprintf(buf, nbytes, "peer rq    : %p\nlower wq   : %p",
  57             peer, lower);
  58 }
  59
  60 /*
  61  * Print our peer's lower queue pointer, and our upper queue pointer.
  62  */
  63 void
  64 logdmux_lqinfo(const queue_t *q, char *buf, size_t nbytes)
  65 {
  66         struct tmx tmx;
  67
  68         (void) mdb_vread(&tmx, sizeof (tmx), (uintptr_t)q->q_ptr);
  69         (void) mdb_snprintf(buf, nbytes, "peer wq    : %p\nupper rq   : %p",
  70             (uintptr_t)tmx.peerq, (uintptr_t)tmx.rdq);
  71 }
  72
  73 uintptr_t
  74 logdmux_lrnext(const queue_t *q)
  75 {
  76         struct tmx tmx;
  77
  78         (void) mdb_vread(&tmx, sizeof (tmx), (uintptr_t)q->q_ptr);
  79         return ((uintptr_t)tmx.rdq);
  80 }
  81
  82 uintptr_t
  83 logdmux_uwnext(const queue_t *q)
  84 {
  85         struct tmx tmx;
  86
  87         (void) mdb_vread(&tmx, sizeof (tmx), (uintptr_t)q->q_ptr);
  88         return ((uintptr_t)tmx.muxq);
  89 }
  90
  91 static const mdb_qops_t logdmux_uqops = {
  92         logdmux_uqinfo, mdb_qrnext_default, logdmux_uwnext
  93 };
  94
  95 static const mdb_qops_t logdmux_lqops = {
  96         logdmux_lqinfo, logdmux_lrnext, mdb_qwnext_default
  97 };
  98
  99 static const mdb_modinfo_t modinfo = { MDB_API_VERSION };
 100
 101 const mdb_modinfo_t *
 102 _mdb_init(void)
 103 {
 104         GElf_Sym sym;
 105
 106         if (mdb_lookup_by_obj("logindmux", "logdmuxuwinit", &sym) == 0)
 107                 mdb_qops_install(&logdmux_uqops, (uintptr_t)sym.st_value);
 108         if (mdb_lookup_by_obj("logindmux", "logdmuxlwinit", &sym) == 0)
 109                 mdb_qops_install(&logdmux_lqops, (uintptr_t)sym.st_value);
 110
 111         return (&modinfo);
 112 }
 113
 114 void
 115 _mdb_fini(void)
 116 {
 117         GElf_Sym sym;
 118
 119         if (mdb_lookup_by_obj("logindmux", "logdmuxuwinit", &sym) == 0)
 120                 mdb_qops_remove(&logdmux_uqops, (uintptr_t)sym.st_value);
 121         if (mdb_lookup_by_obj("logindmux", "logdmuxlwinit", &sym) == 0)
 122                 mdb_qops_remove(&logdmux_lqops, (uintptr_t)sym.st_value);
 123 }