doc/html/man/curs_trace.3x.html

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  41 <H1 class="no-header">curs_trace 3x</H1>
  42 <PRE>
  43 <STRONG><A HREF="curs_trace.3x.html">curs_trace(3x)</A></STRONG>                                                  <STRONG><A HREF="curs_trace.3x.html">curs_trace(3x)</A></STRONG>
  44
  45
  46
  47
  48 </PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
  49        <STRONG>trace</STRONG>, <STRONG>_tracef</STRONG>, <STRONG>_traceattr</STRONG>, <STRONG>_traceattr2</STRONG>, <STRONG>_tracecchar_t</STRONG>, <STRONG>_tracecchar_t2</STRONG>,
  50        <STRONG>_tracechar</STRONG>, <STRONG>_tracechtype</STRONG>, <STRONG>_tracechtype2</STRONG>, <STRONG>_nc_tracebits</STRONG>, <STRONG>_tracedump</STRONG>,
  51        <STRONG>_tracemouse</STRONG> - <STRONG>curses</STRONG> debugging routines
  52
  53
  54 </PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
  55        <STRONG>#include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>
  56
  57        <STRONG>void</STRONG> <STRONG>trace(const</STRONG> <STRONG>unsigned</STRONG> <STRONG>int</STRONG> <EM>param</EM><STRONG>);</STRONG>
  58
  59        <STRONG>void</STRONG> <STRONG>_tracef(const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>format</EM><STRONG>,</STRONG> <STRONG>...);</STRONG>
  60
  61        <STRONG>char</STRONG> <STRONG>*_traceattr(attr_t</STRONG> <EM>attr</EM><STRONG>);</STRONG>
  62        <STRONG>char</STRONG> <STRONG>*_traceattr2(int</STRONG> <EM>buffer</EM><STRONG>,</STRONG> <STRONG>chtype</STRONG> <EM>ch</EM><STRONG>);</STRONG>
  63        <STRONG>char</STRONG> <STRONG>*_tracecchar_t(const</STRONG> <STRONG>cchar_t</STRONG> <STRONG>*</STRONG><EM>string</EM><STRONG>);</STRONG>
  64        <STRONG>char</STRONG> <STRONG>*_tracecchar_t2(int</STRONG> <EM>buffer</EM><STRONG>,</STRONG> <STRONG>const</STRONG> <STRONG>cchar_t</STRONG> <STRONG>*</STRONG><EM>string</EM><STRONG>);</STRONG>
  65        <STRONG>char</STRONG> <STRONG>*_tracechar(int</STRONG> <EM>ch</EM><STRONG>);</STRONG>
  66        <STRONG>char</STRONG> <STRONG>*_tracechtype(chtype</STRONG> <EM>ch</EM><STRONG>);</STRONG>
  67        <STRONG>char</STRONG> <STRONG>*_tracechtype2(int</STRONG> <EM>buffer</EM><STRONG>,</STRONG> <STRONG>chtype</STRONG> <EM>ch</EM><STRONG>);</STRONG>
  68
  69        <STRONG>void</STRONG> <STRONG>_tracedump(const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>label</EM><STRONG>,</STRONG> <STRONG>WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>);</STRONG>
  70        <STRONG>char</STRONG> <STRONG>*_nc_tracebits(void);</STRONG>
  71        <STRONG>char</STRONG> <STRONG>*_tracemouse(const</STRONG> <STRONG>MEVENT</STRONG> <STRONG>*</STRONG><EM>event</EM><STRONG>);</STRONG>
  72
  73
  74 </PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
  75        The  <STRONG>trace</STRONG>  routines  are  used for debugging the ncurses libraries, as
  76        well as applications which use the ncurses libraries.  These  functions
  77        are  normally available only with the debugging library e.g., <EM>libncurs-</EM>
  78        <EM>es</EM><STRONG>_</STRONG><EM>g.a</EM>, but may be compiled into any model (shared, static, profile) by
  79        defining  the  symbol  <STRONG>TRACE</STRONG>.   Additionally,  some  functions are only
  80        available with the wide-character configuration of the libraries.
  81
  82
  83 </PRE><H3><a name="h3-Functions">Functions</a></H3><PRE>
  84        The principal parts of this interface are
  85
  86        <STRONG>o</STRONG>   <STRONG>trace</STRONG>, which selectively enables different tracing features, and
  87
  88        <STRONG>o</STRONG>   <STRONG>_tracef</STRONG>, which writes formatted data to the <EM>trace</EM> file.
  89
  90        Calling <STRONG>trace</STRONG> with a nonzero parameter creates the file  <STRONG>trace</STRONG>  in  the
  91        current  directory  for output.  If the file already exists, no tracing
  92        is done.
  93
  94        The other functions either return a pointer to a string-area (allocated
  95        by the corresponding function), or return no value (such as <STRONG>_tracedump</STRONG>,
  96        which implements the screen dump for <STRONG>TRACE_UPDATE</STRONG>).  The caller  should
  97        not  free  these  strings, since the allocation is reused on successive
  98        calls.  To work around the problem of a single  string-area  per  func-
  99        tion,  some use a buffer-number parameter, telling the library to allo-
 100        cate additional string-areas.
 101
 102
 103 </PRE><H3><a name="h3-Trace-Parameter">Trace Parameter</a></H3><PRE>
 104        The trace parameter is  formed  by  OR'ing  values  from  the  list  of
 105        <STRONG>TRACE_</STRONG><EM>xxx</EM> definitions in <STRONG>&lt;curses.h&gt;</STRONG>.  These include:
 106
 107        <STRONG>TRACE_DISABLE</STRONG>
 108             turn off tracing by passing a zero parameter.
 109
 110             The  library flushes the output file, but retains an open file-de-
 111             scriptor to the trace file so that it can resume tracing later  if
 112             a nonzero parameter is passed to the <STRONG>trace</STRONG> function.
 113
 114        <STRONG>TRACE_TIMES</STRONG>
 115             trace user and system times of updates.
 116
 117        <STRONG>TRACE_TPUTS</STRONG>
 118             trace <STRONG><A HREF="curs_terminfo.3x.html">tputs(3x)</A></STRONG> calls.
 119
 120        <STRONG>TRACE_UPDATE</STRONG>
 121             trace update actions, old &amp; new screens.
 122
 123        <STRONG>TRACE_MOVE</STRONG>
 124             trace cursor movement and scrolling.
 125
 126        <STRONG>TRACE_CHARPUT</STRONG>
 127             trace all character outputs.
 128
 129        <STRONG>TRACE_ORDINARY</STRONG>
 130             trace  all  update  actions.   The old and new screen contents are
 131             written to the trace file for each refresh.
 132
 133        <STRONG>TRACE_CALLS</STRONG>
 134             trace all curses calls.  The parameters for each call are  traced,
 135             as well as return values.
 136
 137        <STRONG>TRACE_VIRTPUT</STRONG>
 138             trace virtual character puts, i.e., calls to <STRONG>addch</STRONG>.
 139
 140        <STRONG>TRACE_IEVENT</STRONG>
 141             trace low-level input processing, including timeouts.
 142
 143        <STRONG>TRACE_BITS</STRONG>
 144             trace state of TTY control bits.
 145
 146        <STRONG>TRACE_ICALLS</STRONG>
 147             trace internal/nested calls.
 148
 149        <STRONG>TRACE_CCALLS</STRONG>
 150             trace per-character calls.
 151
 152        <STRONG>TRACE_DATABASE</STRONG>
 153             trace read/write of terminfo/termcap data.
 154
 155        <STRONG>TRACE_ATTRS</STRONG>
 156             trace changes to video attributes and colors.
 157
 158        <STRONG>TRACE_MAXIMUM</STRONG>
 159             maximum trace level, enables all of the separate trace features.
 160
 161        Some  tracing  features  are  enabled  whenever  the <STRONG>trace</STRONG> parameter is
 162        nonzero.  Some features overlap.  The specific  names  are  used  as  a
 163        guideline.
 164
 165
 166 </PRE><H3><a name="h3-Initialization">Initialization</a></H3><PRE>
 167        These  functions  check  the <STRONG>NCURSES_TRACE</STRONG> environment variable, to set
 168        the tracing feature as if <STRONG>trace</STRONG> was called:
 169
 170            filter, initscr, new_prescr, newterm, nofilter, restartterm,
 171            ripoffline, setupterm, slk_init, tgetent, use_env,
 172            use_extended_names, use_tioctl
 173
 174
 175 </PRE><H3><a name="h3-Command-line-Utilities">Command-line Utilities</a></H3><PRE>
 176        The command-line utilities such as  <STRONG><A HREF="tic.1m.html">tic(1)</A></STRONG>  provide  a  verbose  option
 177        which  extends  the  set  of messages written using the <STRONG>trace</STRONG> function.
 178        Both of these (<STRONG>-v</STRONG> and <STRONG>trace</STRONG>) use the same variable (<STRONG>_nc_tracing</STRONG>), which
 179        determines the messages which are written.
 180
 181        Because  the  command-line  utilities may call initialization functions
 182        such as <STRONG>setupterm</STRONG>, <STRONG>tgetent</STRONG> or <STRONG>use_extended_names</STRONG>, some of their  debug-
 183        ging  output may be directed to the <EM>trace</EM> file if the <STRONG>NCURSES_TRACE</STRONG> en-
 184        vironment variable is set:
 185
 186        <STRONG>o</STRONG>   messages produced in the utility are written to the standard error.
 187
 188        <STRONG>o</STRONG>   messages produced by the underlying library are written to <EM>trace</EM>.
 189
 190        If ncurses is built without tracing, none of the latter  are  produced,
 191        and fewer diagnostics are provided by the command-line utilities.
 192
 193
 194 </PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
 195        Routines  which return a value are designed to be used as parameters to
 196        the <STRONG>_tracef</STRONG> routine.
 197
 198
 199 </PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
 200        These functions are not part of the XSI interface.  Some  other  curses
 201        implementations  are  known to have similar, undocumented features, but
 202        they are not compatible with ncurses.
 203
 204        A few functions are not provided when symbol versioning is used:
 205
 206            _nc_tracebits, _tracedump, _tracemouse
 207
 208
 209 </PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
 210        <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>.
 211
 212
 213
 214                                                                 <STRONG><A HREF="curs_trace.3x.html">curs_trace(3x)</A></STRONG>
 215 </PRE>
 216 <div class="nav">
 217 <ul>
 218 <li><a href="#h2-NAME">NAME</a></li>
 219 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
 220 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
 221 <ul>
 222 <li><a href="#h3-Functions">Functions</a></li>
 223 <li><a href="#h3-Trace-Parameter">Trace Parameter</a></li>
 224 <li><a href="#h3-Initialization">Initialization</a></li>
 225 <li><a href="#h3-Command-line-Utilities">Command-line Utilities</a></li>
 226 </ul>
 227 </li>
 228 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
 229 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
 230 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
 231 </ul>
 232 </div>
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