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4229 mdb hangs on exit when long umem cache names exist
Reviewed by: Robert Mustacchi <rm@joyent.com>


   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 2004 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */



  26 
  27 #ifndef _MDB_NV_H
  28 #define _MDB_NV_H
  29 
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31 
  32 #include <sys/types.h>
  33 
  34 #ifdef  __cplusplus
  35 extern "C" {
  36 #endif
  37 
  38 #ifdef _MDB
  39 





  40 #define MDB_NV_NAMELEN  31      /* Max variable name length including null */
  41 
  42 /*
  43  * These flags are stored inside each variable in v_flags:
  44  */
  45 #define MDB_NV_PERSIST  0x01    /* Variable is persistent (cannot be unset) */
  46 #define MDB_NV_RDONLY   0x02    /* Variable is read-only (cannot insert over) */
  47 #define MDB_NV_EXTNAME  0x04    /* Variable name is stored externally */
  48 #define MDB_NV_TAGGED   0x08    /* Variable is tagged (user-defined) */
  49 #define MDB_NV_OVERLOAD 0x10    /* Variable can be overloaded (multiple defs) */
  50 
  51 /*
  52  * These flags may be passed to mdb_nv_insert() but are not stored
  53  * inside the variable (and thus use bits outside of 0x00 - 0xff):
  54  */
  55 #define MDB_NV_SILENT   0x100   /* Silence warnings about existing defs */
  56 #define MDB_NV_INTERPOS 0x200   /* Interpose definition over previous defs */
  57 
  58 struct mdb_var;                 /* Forward declaration */
  59 struct mdb_walk_state;          /* Forward declaration */
  60 
  61 /*
  62  * Each variable's behavior with respect to the get-value and set-value
  63  * operations can be changed using a discipline: a pointer to an ops
  64  * vector which can re-define these operations:
  65  */
  66 typedef struct mdb_nv_disc {
  67         void (*disc_set)(struct mdb_var *, uintmax_t);
  68         uintmax_t (*disc_get)(const struct mdb_var *);
  69 } mdb_nv_disc_t;
  70 
  71 /*
  72  * Each variable is defined by the following variable-length structure.
  73  * The debugger uses name/value collections to hash almost everything, so
  74  * we make a few simple space optimizations:
  75  *
  76  * A variable's name can be a pointer to external storage (v_ename and
  77  * MDB_NV_EXTNAME set), or it can be stored locally (MDB_NV_NAMELEN - 1
  78  * bytes of storage are allocated immediately after v_lname[0]).
  79  *
  80  * A variable may have multiple definitions (v_ndef chain), but this feature
  81  * is mutually exclusive with MDB_NV_EXTNAME in order to save space.
  82  */
  83 typedef struct mdb_var {
  84         uintmax_t v_uvalue;             /* Value as unsigned integral type */
  85         union {
  86                 const char *v_ename;    /* Variable name if stored externally */
  87                 struct mdb_var *v_ndef; /* Variable's next definition */
  88         } v_du;
  89         const mdb_nv_disc_t *v_disc;    /* Link to variable discipline */
  90         struct mdb_var *v_next;         /* Link to next var in hash chain */
  91         uchar_t v_flags;                /* Variable flags (see above) */
  92         char v_lname[1];                /* Variable name if stored locally */
  93 } mdb_var_t;
  94 
  95 #define MDB_NV_VALUE(v)         ((v)->v_uvalue)
  96 #define MDB_NV_COOKIE(v)        ((void *)(uintptr_t)((v)->v_uvalue))
  97 
  98 #define v_ename         v_du.v_ename




   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 2004 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26 /*
  27  * Copyright (c) 2013 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
  28  */
  29 
  30 #ifndef _MDB_NV_H
  31 #define _MDB_NV_H
  32 


  33 #include <sys/types.h>
  34 
  35 #ifdef  __cplusplus
  36 extern "C" {
  37 #endif
  38 
  39 #ifdef _MDB
  40 
  41 /*
  42  * There used to be a cap (MDB_NV_NAMELEN bytes including null) on the
  43  * length of variable names stored in-line.  This cap is no longer there,
  44  * however parts of mdb use the constant to sanitize input.
  45  */
  46 #define MDB_NV_NAMELEN  31      /* Max variable name length including null */
  47 
  48 /*
  49  * These flags are stored inside each variable in v_flags:
  50  */
  51 #define MDB_NV_PERSIST  0x01    /* Variable is persistent (cannot be unset) */
  52 #define MDB_NV_RDONLY   0x02    /* Variable is read-only (cannot insert over) */
  53 #define MDB_NV_EXTNAME  0x04    /* Variable name is stored externally */
  54 #define MDB_NV_TAGGED   0x08    /* Variable is tagged (user-defined) */
  55 #define MDB_NV_OVERLOAD 0x10    /* Variable can be overloaded (multiple defs) */
  56 
  57 /*
  58  * These flags may be passed to mdb_nv_insert() but are not stored
  59  * inside the variable (and thus use bits outside of 0x00 - 0xff):
  60  */
  61 #define MDB_NV_SILENT   0x100   /* Silence warnings about existing defs */
  62 #define MDB_NV_INTERPOS 0x200   /* Interpose definition over previous defs */
  63 
  64 struct mdb_var;                 /* Forward declaration */
  65 struct mdb_walk_state;          /* Forward declaration */
  66 
  67 /*
  68  * Each variable's behavior with respect to the get-value and set-value
  69  * operations can be changed using a discipline: a pointer to an ops
  70  * vector which can re-define these operations:
  71  */
  72 typedef struct mdb_nv_disc {
  73         void (*disc_set)(struct mdb_var *, uintmax_t);
  74         uintmax_t (*disc_get)(const struct mdb_var *);
  75 } mdb_nv_disc_t;
  76 
  77 /*
  78  * Each variable is defined by the following variable-length structure.
  79  * The debugger uses name/value collections to hash almost everything, so
  80  * we make a few simple space optimizations:
  81  *
  82  * A variable's name can be a pointer to external storage (v_ename and
  83  * MDB_NV_EXTNAME set), or it can be stored locally (bytes of storage are
  84  * allocated immediately after v_lname[0]).
  85  *
  86  * A variable may have multiple definitions (v_ndef chain), but this feature
  87  * is mutually exclusive with MDB_NV_EXTNAME in order to save space.
  88  */
  89 typedef struct mdb_var {
  90         uintmax_t v_uvalue;             /* Value as unsigned integral type */
  91         union {
  92                 const char *v_ename;    /* Variable name if stored externally */
  93                 struct mdb_var *v_ndef; /* Variable's next definition */
  94         } v_du;
  95         const mdb_nv_disc_t *v_disc;    /* Link to variable discipline */
  96         struct mdb_var *v_next;         /* Link to next var in hash chain */
  97         uchar_t v_flags;                /* Variable flags (see above) */
  98         char v_lname[1];                /* Variable name if stored locally */
  99 } mdb_var_t;
 100 
 101 #define MDB_NV_VALUE(v)         ((v)->v_uvalue)
 102 #define MDB_NV_COOKIE(v)        ((void *)(uintptr_t)((v)->v_uvalue))
 103 
 104 #define v_ename         v_du.v_ename