contrib/sendmail/include/sm/debug.h

   1 /*
   2  * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers.
   3  *      All rights reserved.
   4  *
   5  * By using this file, you agree to the terms and conditions set
   6  * forth in the LICENSE file which can be found at the top level of
   7  * the sendmail distribution.
   8  *
   9  *      $Id: debug.h,v 1.15 2001/03/08 03:23:07 ca Exp $
  10  */
  11
  12 /*
  13 **  libsm debugging and tracing
  14 **  See libsm/debug.html for documentation.
  15 */
  16
  17 #ifndef SM_DEBUG_H
  18 # define SM_DEBUG_H
  19
  20 # include <sm/gen.h>
  21 # include <sm/io.h>
  22
  23 /*
  24 **  abstractions for printing trace messages
  25 */
  26
  27 extern SM_FILE_T *
  28 sm_debug_file __P((void));
  29
  30 extern void
  31 sm_debug_setfile __P((
  32         SM_FILE_T *));
  33
  34 extern void PRINTFLIKE(1, 2)
  35 sm_dprintf __P((
  36         char *_fmt,
  37         ...));
  38
  39 extern void
  40 sm_dflush __P((void));
  41
  42 /*
  43 **  abstractions for setting and testing debug activation levels
  44 */
  45
  46 extern void
  47 sm_debug_addsettings_x __P((
  48         const char *));
  49
  50 extern void
  51 sm_debug_addsetting_x __P((
  52         const char *,
  53         int));
  54
  55 # define SM_DEBUG_UNKNOWN       ((SM_ATOMIC_UINT_T)(-1))
  56
  57 extern const char SmDebugMagic[];
  58
  59 typedef struct sm_debug SM_DEBUG_T;
  60 struct sm_debug
  61 {
  62         const char *sm_magic;   /* points to SmDebugMagic */
  63
  64         /*
  65         **  debug_level is the activation level of this debug
  66         **  object.  Level 0 means no debug activity.
  67         **  It is initialized to SM_DEBUG_UNKNOWN, which indicates
  68         **  that the true value is unknown.  If debug_level ==
  69         **  SM_DEBUG_UNKNOWN, then the access functions will look up
  70         **  its true value in the internal table of debug settings.
  71         */
  72
  73         SM_ATOMIC_UINT_T debug_level;
  74
  75         /*
  76         **  debug_name is the name used to reference this SM_DEBUG
  77         **  structure via the sendmail -d option.
  78         */
  79
  80         char *debug_name;
  81
  82         /*
  83         **  debug_desc is a literal character string of the form
  84         **  "@(#)$Debug: <name> - <short description> $"
  85         */
  86
  87         char *debug_desc;
  88
  89         /*
  90         **  We keep a linked list of initialized SM_DEBUG structures
  91         **  so that when sm_debug_addsetting is called, we can reset
  92         **  them all back to the uninitialized state.
  93         */
  94
  95         SM_DEBUG_T *debug_next;
  96 };
  97
  98 # ifndef SM_DEBUG_CHECK
  99 #  define SM_DEBUG_CHECK 1
 100 # endif /* ! SM_DEBUG_CHECK */
 101
 102 # if SM_DEBUG_CHECK
 103 /*
 104 **  This macro is cleverly designed so that if the debug object is below
 105 **  the specified level, then the only overhead is a single comparison
 106 **  (except for the first time this macro is invoked).
 107 */
 108
 109 #  define sm_debug_active(debug, level) \
 110             ((debug)->debug_level >= (level) && \
 111              ((debug)->debug_level != SM_DEBUG_UNKNOWN || \
 112               sm_debug_loadactive(debug, level)))
 113
 114 #  define sm_debug_level(debug) \
 115             ((debug)->debug_level == SM_DEBUG_UNKNOWN \
 116              ? sm_debug_loadlevel(debug) : (debug)->debug_level)
 117
 118 #  define sm_debug_unknown(debug) ((debug)->debug_level == SM_DEBUG_UNKNOWN)
 119 # else /* SM_DEBUG_CHECK */
 120 #  define sm_debug_active(debug, level) 0
 121 #  define sm_debug_level(debug)         0
 122 #  define sm_debug_unknown(debug)       0
 123 # endif /* SM_DEBUG_CHECK */
 124
 125 extern bool
 126 sm_debug_loadactive __P((
 127         SM_DEBUG_T *,
 128         int));
 129
 130 extern int
 131 sm_debug_loadlevel __P((
 132         SM_DEBUG_T *));
 133
 134 # define SM_DEBUG_INITIALIZER(name, desc) { \
 135                 SmDebugMagic, \
 136                 SM_DEBUG_UNKNOWN, \
 137                 name, \
 138                 desc, \
 139                 NULL}
 140
 141 #endif /* ! SM_DEBUG_H */