ncurses 6.0 - patch 20170114

[ncurses.git] / man / curs_trace.3x

diff --git a/man/curs_trace.3x b/man/curs_trace.3x
index bc86a7690d7b1ade6b78bccd8e4fa056b7f0f937..64d4c18ad290bf7c7b95e5af8ce3027cfdae252d 100644 (file)
--- a/man/curs_trace.3x
+++ b/man/curs_trace.3x
@@ -1,5 +1,5 @@
 .\"***************************************************************************
 .\"***************************************************************************

-.\" Copyright (c) 2000-2007,2009 Free Software Foundation, Inc.              *
+.\" Copyright (c) 2000-2016,2017 Free Software Foundation, Inc.              *

 .\"                                                                          *
 .\" Permission is hereby granted, free of charge, to any person obtaining a  *
 .\" copy of this software and associated documentation files (the            *
 .\"                                                                          *
 .\" Permission is hereby granted, free of charge, to any person obtaining a  *
 .\" copy of this software and associated documentation files (the            *


@@ -26,138 +26,189 @@
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"
 .\" authorization.                                                           *
 .\"***************************************************************************
 .\"

-.\" $Id: curs_trace.3x,v 1.10 2009/11/21 18:20:15 tom Exp $
+.\" $Id: curs_trace.3x,v 1.18 2017/01/14 19:46:40 tom Exp $
+.de bP
+.IP \(bu 4
+..

 .TH curs_trace 3X ""
 .na
 .hy 0
 .SH NAME
 .TH curs_trace 3X ""
 .na
 .hy 0
 .SH NAME

+\fBtrace\fR,

 \fB_tracef\fR,
 \fB_tracef\fR,

-\fB_tracedump\fR,

 \fB_traceattr\fR,
 \fB_traceattr2\fR,
 \fB_traceattr\fR,
 \fB_traceattr2\fR,

-\fB_nc_tracebits\fR,

 \fB_tracecchar_t\fR,
 \fB_tracecchar_t2\fR,
 \fB_tracechar\fR,
 \fB_tracechtype\fR,
 \fB_tracechtype2\fR,
 \fB_tracecchar_t\fR,
 \fB_tracecchar_t2\fR,
 \fB_tracechar\fR,
 \fB_tracechtype\fR,
 \fB_tracechtype2\fR,

-\fB_tracemouse\fR,
-\fBtrace\fR - \fBcurses\fR debugging routines
+\fB_nc_tracebits\fR,
+\fB_tracedump\fR,
+\fB_tracemouse\fR \- \fBcurses\fR debugging routines

 .ad
 .hy
 .SH SYNOPSIS
 \fB#include <curses.h>\fR
 .sp
 .ad
 .hy
 .SH SYNOPSIS
 \fB#include <curses.h>\fR
 .sp

-\fBvoid _tracef(const char *format, ...);\fR
-.br
-\fBvoid _tracedump(const char *label, WINDOW *win);\fR
-.br
-\fBchar *_traceattr(attr_t attr);\fR
-.br
-\fBchar *_traceattr2(int buffer, chtype ch);\fR
+\fBvoid trace(const unsigned int \fP\fIparam\fP\fB);\fR
+.sp
+\fBvoid _tracef(const char *\fP\fIformat\fP\fB, ...);\fR
+.sp
+\fBchar *_traceattr(attr_t \fP\fIattr\fP\fB);\fR

 .br
 .br

-\fBchar *_nc_tracebits(void);\fR
+\fBchar *_traceattr2(int \fP\fIbuffer\fP\fB, chtype \fP\fIch\fP\fB);\fR

 .br
 .br

-\fBchar * _tracecchar_t(const cchar_t *string);\fR
+\fBchar *_tracecchar_t(const cchar_t *\fP\fIstring\fP\fB);\fR

 .br
 .br

-\fBchar * _tracecchar_t2(int buffer, const cchar_t *string);\fR
+\fBchar *_tracecchar_t2(int \fP\fIbuffer\fP\fB, const cchar_t *\fP\fIstring\fP\fB);\fR

 .br
 .br

-\fBchar *_tracechar(int ch);\fR
+\fBchar *_tracechar(int \fP\fIch\fP\fB);\fR

 .br
 .br

-\fBchar *_tracechtype(chtype ch);\fR
+\fBchar *_tracechtype(chtype \fP\fIch\fP\fB);\fR

 .br
 .br

-\fBchar *_tracechtype2(int buffer, chtype ch);\fR
+\fBchar *_tracechtype2(int \fP\fIbuffer\fP\fB, chtype \fP\fIch\fP\fB);\fR
+.sp
+\fBvoid _tracedump(const char *\fP\fIlabel\fP\fB, WINDOW *\fP\fIwin\fP\fB);\fR

 .br
 .br

-\fBchar *_tracemouse(const MEVENT *event);\fR
+\fBchar *_nc_tracebits(void);\fR

 .br
 .br

-\fBvoid trace(const unsigned int param);\fR
+\fBchar *_tracemouse(const MEVENT *\fP\fIevent\fP\fB);\fR

 .SH DESCRIPTION
 The \fBtrace\fR 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
 .SH DESCRIPTION
 The \fBtrace\fR 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

-\fIlibncurses_g.a\fR, but may be compiled into any model (shared, static,
+e.g., \fIlibncurses_g.a\fR, but may be compiled into any model (shared, static,

 profile) by defining the symbol \fBTRACE\fR.
 Additionally, some functions are only available with the wide-character
 configuration of the libraries.
 profile) by defining the symbol \fBTRACE\fR.
 Additionally, some functions are only available with the wide-character
 configuration of the libraries.

+.SS Functions
+The principal parts of this interface are
+.bP
+\fBtrace\fR, which selectively enables different tracing features, and
+.bP
+\fB_tracef\fR, which writes formatted data to the \fItrace\fR file.

 .PP
 .PP

-The principal parts of this interface are the \fBtrace\fR routine which
-selectively enables different tracing features, and the \fB_tracef\fR
-routine which writes formatted data to the \fItrace\fR file.
+Calling \fBtrace\fR with a nonzero parameter creates the file \fBtrace\fR
+in the current directory for output.
+If the file already exists, no tracing is done.

 .PP
 .PP

-Calling \fBtrace\fR with a nonzero parameter opens the file \fBtrace\fR
-in the current directory for output.  The parameter is formed by OR'ing
+The other functions either return a pointer to a string-area
+(allocated by the corresponding function),
+or return no value (such as \fB_tracedump\fP, which implements the
+screen dump for \fBTRACE_UPDATE\fP).
+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 function,
+some use a buffer-number parameter, telling the library to allocate
+additional string-areas.
+.SS Trace Parameter
+The trace parameter is formed by OR'ing

 values from the list of \fBTRACE_\fP\fIxxx\fR definitions in \fB<curses.h>\fR.
 These include:
 .TP 5
 values from the list of \fBTRACE_\fP\fIxxx\fR definitions in \fB<curses.h>\fR.
 These include:
 .TP 5

-TRACE_DISABLE
-turn off tracing.
+.B TRACE_DISABLE
+turn off tracing by passing a zero parameter.
+.IP
+The library flushes the output file,
+but retains an open file-descriptor to the trace file
+so that it can resume tracing later if a nonzero parameter is passed
+to the \fBtrace\fP function.

 .TP 5
 .TP 5

-TRACE_TIMES
+.B TRACE_TIMES

 trace user and system times of updates.
 .TP 5
 trace user and system times of updates.
 .TP 5

-TRACE_TPUTS
-trace tputs calls.
+.B TRACE_TPUTS
+trace \fBtputs\fP(3X) calls.

 .TP 5
 .TP 5

-TRACE_UPDATE
+.B TRACE_UPDATE

 trace update actions, old & new screens.
 .TP 5
 trace update actions, old & new screens.
 .TP 5

-TRACE_MOVE
+.B TRACE_MOVE

 trace cursor movement and scrolling.
 .TP 5
 trace cursor movement and scrolling.
 .TP 5

-TRACE_CHARPUT
+.B TRACE_CHARPUT

 trace all character outputs.
 .TP 5
 trace all character outputs.
 .TP 5

-TRACE_ORDINARY
+.B TRACE_ORDINARY

 trace all update actions.
 The old and new screen contents are written to the trace file
 for each refresh.
 .TP 5
 trace all update actions.
 The old and new screen contents are written to the trace file
 for each refresh.
 .TP 5

-TRACE_CALLS
+.B TRACE_CALLS

 trace all curses calls.
 The parameters for each call are traced, as well as return values.
 .TP 5
 trace all curses calls.
 The parameters for each call are traced, as well as return values.
 .TP 5

-TRACE_VIRTPUT
+.B TRACE_VIRTPUT

 trace virtual character puts, i.e., calls to \fBaddch\fR.
 .TP 5
 trace virtual character puts, i.e., calls to \fBaddch\fR.
 .TP 5

-TRACE_IEVENT
+.B TRACE_IEVENT

 trace low-level input processing, including timeouts.
 .TP 5
 trace low-level input processing, including timeouts.
 .TP 5

-TRACE_BITS
+.B TRACE_BITS

 trace state of TTY control bits.
 .TP 5
 trace state of TTY control bits.
 .TP 5

-TRACE_ICALLS
+.B TRACE_ICALLS

 trace internal/nested calls.
 .TP 5
 trace internal/nested calls.
 .TP 5

-TRACE_CCALLS
+.B TRACE_CCALLS

 trace per-character calls.
 .TP 5
 trace per-character calls.
 .TP 5

-TRACE_DATABASE
+.B TRACE_DATABASE

 trace read/write of terminfo/termcap data.
 .TP 5
 trace read/write of terminfo/termcap data.
 .TP 5

-TRACE_ATTRS
+.B TRACE_ATTRS

 trace changes to video attributes and colors.
 .TP 5
 trace changes to video attributes and colors.
 .TP 5

-TRACE_MAXIMUM
+.B TRACE_MAXIMUM

 maximum trace level, enables all of the separate trace features.
 .PP
 Some tracing features are enabled whenever the \fBtrace\fR parameter
 maximum trace level, enables all of the separate trace features.
 .PP
 Some tracing features are enabled whenever the \fBtrace\fR parameter

-is nonzero.  Some features overlap.
+is nonzero.
+Some features overlap.

 The specific names are used as a guideline.
 The specific names are used as a guideline.

-.PP
+.SS Initialization

 These functions check the \fBNCURSES_TRACE\fP environment variable,
 to set the tracing feature as if \fBtrace\fP was called:
 These functions check the \fBNCURSES_TRACE\fP environment variable,
 to set the tracing feature as if \fBtrace\fP was called:

-.RS
+.RS 4
+.PP
+.na
+.hy 0

 filter,
 initscr,
 new_prescr,
 newterm,
 nofilter,
 filter,
 initscr,
 new_prescr,
 newterm,
 nofilter,

+restartterm,

 ripoffline,
 setupterm,
 slk_init,
 ripoffline,
 setupterm,
 slk_init,

-tgetent
+tgetent,
+use_env,
+use_extended_names,
+use_tioctl
+.hy
+.ad

 .RE
 .RE

-
+.SS Command-line Utilities
+.PP
+The command-line utilities such as \fBtic\fP(1) provide a verbose option
+which extends the set of messages written using the \fBtrace\fP function.
+Both of these (\fB\-v\fP and \fBtrace\fP)
+use the same variable (\fB_nc_tracing\fP),
+which determines the messages which are written.
+.PP
+Because the command-line utilities may call initialization functions
+such as \fBsetupterm\fP, \fBtgetent\fP or \fBuse_extended_names\fP,
+some of their debugging output may be directed to the \fItrace\fP file
+if the \fBNCURSES_TRACE\fP environment variable is set:
+.bP
+messages produced in the utility are written to the standard error.
+.bP
+messages produced by the underlying library are written to \fItrace\fP.
+.PP
+If ncurses is built without tracing, none of the latter are produced,
+and fewer diagnostics are provided by the command-line utilities.

 .SH RETURN VALUE
 Routines which return a value are designed to be used as parameters
 to the \fB_tracef\fR routine.
 .SH RETURN VALUE
 Routines which return a value are designed to be used as parameters
 to the \fB_tracef\fR routine.


@@ -166,11 +217,13 @@ 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.
 Some other curses implementations are known to
 have similar, undocumented features,
 but they are not compatible with ncurses.

+.PP
+A few functions are not provided when symbol versioning is used:
+.RS 4
+.PP
+_nc_tracebits,
+_tracedump,
+_tracemouse
+.RE

 .SH SEE ALSO
 \fBcurses\fR(3X).
 .SH SEE ALSO
 \fBcurses\fR(3X).

-.\"#
-.\"# The following sets edit modes for GNU EMACS
-.\"# Local Variables:
-.\"# mode:nroff
-.\"# fill-column:79
-.\"# End: