ncurses 6.0 - patch 20180106
[ncurses.git] / doc / html / man / curs_trace.3x.html
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-  * @Id: curs_trace.3x,v 1.5 2002/02/16 22:39:52 tom Exp @
+  * @Id: curs_trace.3x,v 1.19 2017/11/18 23:47:37 tom Exp @
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-<H1>curs_trace 3x</H1>
-<HR>
+<H1 class="no-header">curs_trace 3x</H1>
 <PRE>
-<!-- Manpage converted by man2html 3.0.1 -->
+<STRONG><A HREF="curs_trace.3x.html">curs_trace(3x)</A></STRONG>                                                  <STRONG><A HREF="curs_trace.3x.html">curs_trace(3x)</A></STRONG>
 
-</PRE>
-<H2>NAME</H2><PRE>
-       <STRONG>_tracef</STRONG>,      <STRONG>_tracedump</STRONG>,     <STRONG>_traceattr</STRONG>,     <STRONG>_traceattr2</STRONG>,
-       <STRONG>_nc_tracebits</STRONG>,  <STRONG>_tracechar</STRONG>,  <STRONG>_tracechtype</STRONG>,  <STRONG>_tracechtype2</STRONG>,
-       <STRONG>_tracemouse</STRONG>, <STRONG>trace</STRONG> - <STRONG>curses</STRONG> debugging routines
 
 
-</PRE>
-<H2>SYNOPSIS</H2><PRE>
+
+</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
+       <STRONG>trace</STRONG>, <STRONG>_tracef</STRONG>, <STRONG>_traceattr</STRONG>, <STRONG>_traceattr2</STRONG>, <STRONG>_tracecchar_t</STRONG>, <STRONG>_tracecchar_t2</STRONG>,
+       <STRONG>_tracechar</STRONG>, <STRONG>_tracechtype</STRONG>, <STRONG>_tracechtype2</STRONG>, <STRONG>_nc_tracebits</STRONG>, <STRONG>_tracedump</STRONG>,
+       <STRONG>_tracemouse</STRONG> - <STRONG>curses</STRONG> debugging routines
+
+
+</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
        <STRONG>#include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>
-       <STRONG>void</STRONG> <STRONG>_tracef(const</STRONG> <STRONG>char</STRONG> <STRONG>*format,</STRONG> <STRONG>...);</STRONG>
-       <STRONG>void</STRONG> <STRONG>_tracedump(const</STRONG> <STRONG>char</STRONG> <STRONG>*label,</STRONG> <STRONG>WINDOW</STRONG> <STRONG>*win);</STRONG>
-       <STRONG>char</STRONG> <STRONG>*_traceattr(attr_t</STRONG> <STRONG>attr);</STRONG>
-       <STRONG>char</STRONG> <STRONG>*_traceattr2(int</STRONG> <STRONG>buffer,</STRONG> <STRONG>chtype</STRONG> <STRONG>ch);</STRONG>
+
+       <STRONG>void</STRONG> <STRONG>trace(const</STRONG> <STRONG>unsigned</STRONG> <STRONG>int</STRONG> <EM>param</EM><STRONG>);</STRONG>
+
+       <STRONG>void</STRONG> <STRONG>_tracef(const</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG><EM>format</EM><STRONG>,</STRONG> <STRONG>...);</STRONG>
+
+       <STRONG>char</STRONG> <STRONG>*_traceattr(attr_t</STRONG> <EM>attr</EM><STRONG>);</STRONG>
+       <STRONG>char</STRONG> <STRONG>*_traceattr2(int</STRONG> <EM>buffer</EM><STRONG>,</STRONG> <STRONG>chtype</STRONG> <EM>ch</EM><STRONG>);</STRONG>
+       <STRONG>char</STRONG> <STRONG>*_tracecchar_t(const</STRONG> <STRONG>cchar_t</STRONG> <STRONG>*</STRONG><EM>string</EM><STRONG>);</STRONG>
+       <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>
+       <STRONG>char</STRONG> <STRONG>*_tracechar(int</STRONG> <EM>ch</EM><STRONG>);</STRONG>
+       <STRONG>char</STRONG> <STRONG>*_tracechtype(chtype</STRONG> <EM>ch</EM><STRONG>);</STRONG>
+       <STRONG>char</STRONG> <STRONG>*_tracechtype2(int</STRONG> <EM>buffer</EM><STRONG>,</STRONG> <STRONG>chtype</STRONG> <EM>ch</EM><STRONG>);</STRONG>
+
+       <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>
        <STRONG>char</STRONG> <STRONG>*_nc_tracebits(void);</STRONG>
-       <STRONG>char</STRONG> <STRONG>*_tracechar(const</STRONG> <STRONG>unsigned</STRONG> <STRONG>char</STRONG> <STRONG>ch);</STRONG>
-       <STRONG>char</STRONG> <STRONG>*_tracechtype(chtype</STRONG> <STRONG>ch);</STRONG>
-       <STRONG>char</STRONG> <STRONG>*_tracechtype2(int</STRONG> <STRONG>buffer,</STRONG> <STRONG>chtype</STRONG> <STRONG>ch);</STRONG>
-       <STRONG>char</STRONG> <STRONG>*_tracemouse(const</STRONG> <STRONG>MEVENT</STRONG> <STRONG>*event);</STRONG>
-       <STRONG>void</STRONG> <STRONG>trace(const</STRONG> <STRONG>unsigned</STRONG> <STRONG>int</STRONG> <STRONG>param);</STRONG>
+       <STRONG>char</STRONG> <STRONG>*_tracemouse(const</STRONG> <STRONG>MEVENT</STRONG> <STRONG>*</STRONG><EM>event</EM><STRONG>);</STRONG>
 
 
-</PRE>
-<H2>DESCRIPTION</H2><PRE>
-       The  <STRONG>trace</STRONG>  routines  are  used  for debugging the ncurses
-       libraries, as well as applications which use  the  ncurses
-       libraries.   These  functions  are normally available only
-       with the debugging library <EM>libncurses</EM><STRONG>_</STRONG><EM>g.a</EM>, but may be com-
-       piled into any model (shared, static, profile) by defining
-       the symbol <STRONG>TRACE</STRONG>.
-
-       The principal parts of this interface are the  <STRONG>trace</STRONG>  rou-
-       tine which selectively enables different tracing features,
-       and the <STRONG>_tracef</STRONG> routine which writes formatted data to the
-       <EM>trace</EM> file.
-
-       Calling  <STRONG>trace</STRONG>  with  a  nonzero  parameter opens the file
-       <STRONG>trace</STRONG> in the current directory for output.  The  parameter
-       is formed by OR'ing values from the list of <STRONG>TRACE_</STRONG><EM>xxx</EM> def-
-       initions in <STRONG>&lt;curses.h&gt;</STRONG>.  These include:
-
-       TRACE_DISABLE
-            turn off tracing.
-
-       TRACE_TIMES
+</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
+       The  <STRONG>trace</STRONG>  routines  are  used for debugging the ncurses libraries, as
+       well as applications which use the ncurses libraries.  These  functions
+       are  normally available only with the debugging library e.g., <EM>libncurs-</EM>
+       <EM>es</EM><STRONG>_</STRONG><EM>g.a</EM>, but may be compiled into any model (shared, static, profile) by
+       defining  the  symbol  <STRONG>TRACE</STRONG>.   Additionally,  some  functions are only
+       available with the wide-character configuration of the libraries.
+
+
+</PRE><H3><a name="h3-Functions">Functions</a></H3><PRE>
+       The principal parts of this interface are
+
+       <STRONG>o</STRONG>   <STRONG>trace</STRONG>, which selectively enables different tracing features, and
+
+       <STRONG>o</STRONG>   <STRONG>_tracef</STRONG>, which writes formatted data to the <EM>trace</EM> file.
+
+       Calling <STRONG>trace</STRONG> with a nonzero parameter creates the file  <STRONG>trace</STRONG>  in  the
+       current  directory  for output.  If the file already exists, no tracing
+       is done.
+
+       The other functions either return a pointer to a string-area (allocated
+       by the corresponding function), or return no value (such as <STRONG>_tracedump</STRONG>,
+       which implements the screen dump for <STRONG>TRACE_UPDATE</STRONG>).  The caller  should
+       not  free  these  strings, since the allocation is reused on successive
+       calls.  To work around the problem of a single  string-area  per  func-
+       tion,  some use a buffer-number parameter, telling the library to allo-
+       cate additional string-areas.
+
+
+</PRE><H3><a name="h3-Trace-Parameter">Trace Parameter</a></H3><PRE>
+       The trace parameter is  formed  by  OR'ing  values  from  the  list  of
+       <STRONG>TRACE_</STRONG><EM>xxx</EM> definitions in <STRONG>&lt;curses.h&gt;</STRONG>.  These include:
+
+       <STRONG>TRACE_DISABLE</STRONG>
+            turn off tracing by passing a zero parameter.
+
+            The  library flushes the output file, but retains an open file-de-
+            scriptor to the trace file so that it can resume tracing later  if
+            a nonzero parameter is passed to the <STRONG>trace</STRONG> function.
+
+       <STRONG>TRACE_TIMES</STRONG>
             trace user and system times of updates.
 
-       TRACE_TPUTS
-            trace tputs calls.
+       <STRONG>TRACE_TPUTS</STRONG>
+            trace <STRONG><A HREF="curs_terminfo.3x.html">tputs(3x)</A></STRONG> calls.
 
-       TRACE_UPDATE
+       <STRONG>TRACE_UPDATE</STRONG>
             trace update actions, old &amp; new screens.
 
-       TRACE_MOVE
+       <STRONG>TRACE_MOVE</STRONG>
             trace cursor movement and scrolling.
 
-       TRACE_CHARPUT
+       <STRONG>TRACE_CHARPUT</STRONG>
             trace all character outputs.
 
-       TRACE_ORDINARY
-            trace all update actions.  The  old  and  new  screen
-            contents  are  written  to  the  trace  file for each
-            refresh.
+       <STRONG>TRACE_ORDINARY</STRONG>
+            trace  all  update  actions.   The old and new screen contents are
+            written to the trace file for each refresh.
 
-       TRACE_CALLS
-            trace all curses calls.  The parameters for each call
-            are traced, as well as return values.
+       <STRONG>TRACE_CALLS</STRONG>
+            trace all curses calls.  The parameters for each call are  traced,
+            as well as return values.
 
-       TRACE_VIRTPUT
+       <STRONG>TRACE_VIRTPUT</STRONG>
             trace virtual character puts, i.e., calls to <STRONG>addch</STRONG>.
 
-       TRACE_IEVENT
+       <STRONG>TRACE_IEVENT</STRONG>
             trace low-level input processing, including timeouts.
 
-       TRACE_BITS
+       <STRONG>TRACE_BITS</STRONG>
             trace state of TTY control bits.
 
-       TRACE_ICALLS
+       <STRONG>TRACE_ICALLS</STRONG>
             trace internal/nested calls.
 
-       TRACE_CCALLS
+       <STRONG>TRACE_CCALLS</STRONG>
             trace per-character calls.
 
-       TRACE_DATABASE
+       <STRONG>TRACE_DATABASE</STRONG>
             trace read/write of terminfo/termcap data.
 
-       TRACE_ATTRS
+       <STRONG>TRACE_ATTRS</STRONG>
             trace changes to video attributes and colors.
 
-       TRACE_MAXIMUM
-            maximum trace level,  enables  all  of  the  separate
-            trace features.
+       <STRONG>TRACE_MAXIMUM</STRONG>
+            maximum trace level, enables all of the separate trace features.
 
-            Some  tracing features are enabled whenever the <STRONG>trace</STRONG>
-            parameter is nonzero.  Some  features  overlap.   The
-            specific names are used as a guideline.
+       Some  tracing  features  are  enabled  whenever  the <STRONG>trace</STRONG> parameter is
+       nonzero.  Some features overlap.  The specific  names  are  used  as  a
+       guideline.
 
 
-</PRE>
-<H2>RETURN VALUE</H2><PRE>
-       Routines  which  return a value are designed to be used as
-       parameters to the <STRONG>_tracef</STRONG> routine.
+</PRE><H3><a name="h3-Initialization">Initialization</a></H3><PRE>
+       These  functions  check  the <STRONG>NCURSES_TRACE</STRONG> environment variable, to set
+       the tracing feature as if <STRONG>trace</STRONG> was called:
 
+           filter, initscr, new_prescr, newterm, nofilter, restartterm,
+           ripoffline, setupterm, slk_init, tgetent, use_env,
+           use_extended_names, use_tioctl
 
-</PRE>
-<H2>PORTABILITY</H2><PRE>
-       These functions are not part of the XSI  interface.   Some
-       other  curses  implementations  are known to have similar,
-       undocumented features, but they are  not  compatible  with
-       ncurses.
 
+</PRE><H3><a name="h3-Command-line-Utilities">Command-line Utilities</a></H3><PRE>
+       The command-line utilities such as  <STRONG><A HREF="tic.1m.html">tic(1)</A></STRONG>  provide  a  verbose  option
+       which  extends  the  set  of messages written using the <STRONG>trace</STRONG> function.
+       Both of these (<STRONG>-v</STRONG> and <STRONG>trace</STRONG>) use the same variable (<STRONG>_nc_tracing</STRONG>), which
+       determines the messages which are written.
 
-</PRE>
-<H2>SEE ALSO</H2><PRE>
-       <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>.
+       Because  the  command-line  utilities may call initialization functions
+       such as <STRONG>setupterm</STRONG>, <STRONG>tgetent</STRONG> or <STRONG>use_extended_names</STRONG>, some of their  debug-
+       ging  output may be directed to the <EM>trace</EM> file if the <STRONG>NCURSES_TRACE</STRONG> en-
+       vironment variable is set:
+
+       <STRONG>o</STRONG>   messages produced in the utility are written to the standard error.
+
+       <STRONG>o</STRONG>   messages produced by the underlying library are written to <EM>trace</EM>.
 
+       If ncurses is built without tracing, none of the latter  are  produced,
+       and fewer diagnostics are provided by the command-line utilities.
+
+
+</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
+       Routines  which return a value are designed to be used as parameters to
+       the <STRONG>_tracef</STRONG> routine.
+
+
+</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
+       These functions are not part of the XSI interface.  Some  other  curses
+       implementations  are  known to have similar, undocumented features, but
+       they are not compatible with ncurses.
+
+       A few functions are not provided when symbol versioning is used:
+
+           _nc_tracebits, _tracedump, _tracemouse
+
+
+</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
+       <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>.
 
 
 
+                                                                <STRONG><A HREF="curs_trace.3x.html">curs_trace(3x)</A></STRONG>
 </PRE>
-<HR>
-<ADDRESS>
-Man(1) output converted with
-<a href="http://www.oac.uci.edu/indiv/ehood/man2html.html">man2html</a>
-</ADDRESS>
+<div class="nav">
+<ul>
+<li><a href="#h2-NAME">NAME</a></li>
+<li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
+<li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
+<ul>
+<li><a href="#h3-Functions">Functions</a></li>
+<li><a href="#h3-Trace-Parameter">Trace Parameter</a></li>
+<li><a href="#h3-Initialization">Initialization</a></li>
+<li><a href="#h3-Command-line-Utilities">Command-line Utilities</a></li>
+</ul>
+</li>
+<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
+<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
+<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
+</ul>
+</div>
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