307 lines
10 KiB
Plaintext
Executable File
307 lines
10 KiB
Plaintext
Executable File
_dnl__ Copyright (c) 1988 1989 1990 1991 Free Software Foundation, Inc.
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_dnl__ This file is part of the source for the GDB manual.
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@c M4 FRAGMENT: $Id$
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@node Controlling _GDBN__, Sequences, Targets, Top
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@chapter Controlling _GDBN__
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You can alter many aspects of _GDBN__'s interaction with you by using
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the @code{set} command. For commands controlling how _GDBN__ displays
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data, @pxref{Print Settings}; other settings are described here.
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@menu
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* Prompt:: Prompt
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* Editing:: Command Editing
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* History:: Command History
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* Screen Size:: Screen Size
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* Numbers:: Numbers
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* Messages/Warnings:: Optional Warnings and Messages
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@end menu
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@node Prompt, Editing, Controlling _GDBN__, Controlling _GDBN__
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@section Prompt
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@cindex prompt
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_GDBN__ indicates its readiness to read a command by printing a string
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called the @dfn{prompt}. This string is normally @samp{(_GDBP__)}. You
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can change the prompt string with the @code{set prompt} command. For
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instance, when debugging _GDBN__ with _GDBN__, it is useful to change
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the prompt in one of the _GDBN__<>s so that you can always tell which
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one you are talking to.
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@table @code
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@item set prompt @var{newprompt}
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@kindex set prompt
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Directs _GDBN__ to use @var{newprompt} as its prompt string henceforth.
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@kindex show prompt
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@item show prompt
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Prints a line of the form: @samp{Gdb's prompt is: @var{your-prompt}}
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@end table
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@node Editing, History, Prompt, Controlling _GDBN__
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@section Command Editing
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@cindex readline
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@cindex command line editing
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_GDBN__ reads its input commands via the @dfn{readline} interface. This
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GNU library provides consistent behavior for programs which provide a
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command line interface to the user. Advantages are @code{emacs}-style
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or @code{vi}-style inline editing of commands, @code{csh}-like history
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substitution, and a storage and recall of command history across
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debugging sessions.
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You may control the behavior of command line editing in _GDBN__ with the
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command @code{set}.
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@table @code
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@kindex set editing
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@cindex editing
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@item set editing
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@itemx set editing on
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Enable command line editing (enabled by default).
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@item set editing off
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Disable command line editing.
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@kindex show editing
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@item show editing
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Show whether command line editing is enabled.
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@end table
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@node History, Screen Size, Editing, Controlling _GDBN__
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@section Command History
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@table @code
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@cindex history substitution
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@cindex history file
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@kindex set history filename
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@item set history filename @var{fname}
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Set the name of the _GDBN__ command history file to @var{fname}. This is
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the file from which _GDBN__ will read an initial command history
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list or to which it will write this list when it exits. This list is
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accessed through history expansion or through the history
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command editing characters listed below. This file defaults to the
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value of the environment variable @code{GDBHISTFILE}, or to
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@file{./.gdb_history} if this variable is not set.
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@cindex history save
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@kindex set history save
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@item set history save
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@itemx set history save on
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Record command history in a file, whose name may be specified with the
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@code{set history filename} command. By default, this option is disabled.
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@item set history save off
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Stop recording command history in a file.
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@cindex history size
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@kindex set history size
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@item set history size @var{size}
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Set the number of commands which _GDBN__ will keep in its history list.
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This defaults to the value of the environment variable
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@code{HISTSIZE}, or to 256 if this variable is not set.
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@end table
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@cindex history expansion
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History expansion assigns special meaning to the character @kbd{!}.
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@iftex
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(@xref{Event Designators}.)
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@end iftex
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Since @kbd{!} is also the logical not operator in C, history expansion
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is off by default. If you decide to enable history expansion with the
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@code{set history expansion on} command, you may sometimes need to
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follow @kbd{!} (when it is used as logical not, in an expression) with
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a space or a tab to prevent it from being expanded. The readline
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history facilities will not attempt substitution on the strings
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@kbd{!=} and @kbd{!(}, even when history expansion is enabled.
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The commands to control history expansion are:
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@table @code
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@kindex set history expansion
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@item set history expansion on
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@itemx set history expansion
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Enable history expansion. History expansion is off by default.
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@item set history expansion off
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Disable history expansion.
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The readline code comes with more complete documentation of
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editing and history expansion features. Users unfamiliar with @code{emacs}
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or @code{vi} may wish to read it.
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@iftex
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@xref{Command Line Editing}.
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@end iftex
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@c @group
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@kindex show history
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@item show history
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@itemx show history filename
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@itemx show history save
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@itemx show history size
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@itemx show history expansion
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These commands display the state of the _GDBN__ history parameters.
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@code{show history} by itself displays all four states.
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@c @end group
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@end table
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@table @code
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@kindex show commands
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@item show commands
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Display the last ten commands in the command history.
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@item show commands @var{n}
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Print ten commands centered on command number @var{n}.
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@item show commands +
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Print ten commands just after the commands last printed.
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@end table
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@node Screen Size, Numbers, History, Controlling _GDBN__
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@section Screen Size
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@cindex size of screen
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@cindex pauses in output
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Certain commands to _GDBN__ may produce large amounts of information
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output to the screen. To help you read all of it, _GDBN__ pauses and
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asks you for input at the end of each page of output. Type @key{RET}
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when you want to continue the output. _GDBN__ also uses the screen
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width setting to determine when to wrap lines of output. Depending on
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what is being printed, it tries to break the line at a readable place,
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rather than simply letting it overflow onto the following line.
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Normally _GDBN__ knows the size of the screen from the termcap data base
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together with the value of the @code{TERM} environment variable and the
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@code{stty rows} and @code{stty cols} settings. If this is not correct,
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you can override it with the @code{set height} and @code{set
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width} commands:
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@table @code
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@item set height @var{lpp}
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@itemx show height
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@itemx set width @var{cpl}
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@itemx show width
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@kindex set height
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@kindex set width
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@kindex show width
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@kindex show height
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These @code{set} commands specify a screen height of @var{lpp} lines and
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a screen width of @var{cpl} characters. The associated @code{show}
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commands display the current settings.
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If you specify a height of zero lines, _GDBN__ will not pause during output
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no matter how long the output is. This is useful if output is to a file
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or to an editor buffer.
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@end table
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@node Numbers, Messages/Warnings, Screen Size, Controlling _GDBN__
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@section Numbers
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@cindex number representation
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@cindex entering numbers
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You can always enter numbers in octal, decimal, or hexadecimal in _GDBN__ by
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the usual conventions: octal numbers begin with @samp{0}, decimal
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numbers end with @samp{.}, and hexadecimal numbers begin with @samp{0x}.
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Numbers that begin with none of these are, by default, entered in base
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10; likewise, the default display for numbers---when no particular
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format is specified---is base 10. You can change the default base for
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both input and output with the @code{set radix} command.
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@table @code
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@kindex set radix
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@item set radix @var{base}
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Set the default base for numeric input and display. Supported choices
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for @var{base} are decimal 8, 10, 16. @var{base} must itself be
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specified either unambiguously or using the current default radix; for
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example, any of
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@example
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set radix 012
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set radix 10.
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set radix 0xa
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@end example
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@noindent
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will set the base to decimal. On the other hand, @samp{set radix 10}
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will leave the radix unchanged no matter what it was.
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@kindex show radix
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@item show radix
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Display the current default base for numeric input and display.
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@end table
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@node Messages/Warnings, , Numbers, Controlling _GDBN__
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@section Optional Warnings and Messages
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By default, _GDBN__ is silent about its inner workings. If you are running
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on a slow machine, you may want to use the @code{set verbose} command.
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It will make _GDBN__ tell you when it does a lengthy internal operation, so
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you won't think it has crashed.
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Currently, the messages controlled by @code{set verbose} are those which
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announce that the symbol table for a source file is being read
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(@pxref{Files}, in the description of the command
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@code{symbol-file}).
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@c The following is the right way to do it, but emacs 18.55 doesn't support
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@c @ref, and neither the emacs lisp manual version of texinfmt or makeinfo
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@c is released.
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@ignore
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see @code{symbol-file} in @ref{Files}).
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@end ignore
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@table @code
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@kindex set verbose
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@item set verbose on
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Enables _GDBN__'s output of certain informational messages.
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@item set verbose off
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Disables _GDBN__'s output of certain informational messages.
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@kindex show verbose
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@item show verbose
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Displays whether @code{set verbose} is on or off.
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@end table
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By default, if _GDBN__ encounters bugs in the symbol table of an object file,
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it prints a single message about each type of problem it finds, then
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shuts up (@pxref{Symbol Errors}). You can suppress these messages, or allow more than one such
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message to be printed if you want to see how frequent the problems are.
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@table @code
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@kindex set complaints
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@item set complaints @var{limit}
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Permits _GDBN__ to output @var{limit} complaints about each type of unusual
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symbols before becoming silent about the problem. Set @var{limit} to
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zero to suppress all complaints; set it to a large number to prevent
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complaints from being suppressed.
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@kindex show complaints
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@item show complaints
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Displays how many symbol complaints _GDBN__ is permitted to produce.
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@end table
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By default, _GDBN__ is cautious, and asks what sometimes seem to be a
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lot of stupid questions to confirm certain commands. For example, if
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you try to run a program which is already running:
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@example
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(_GDBP__) run
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The program being debugged has been started already.
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Start it from the beginning? (y or n)
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@end example
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If you're willing to unflinchingly face the consequences of your own
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commands, you can disable this ``feature'':
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@table @code
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@kindex set confirm
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@cindex flinching
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@cindex confirmation
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@cindex stupid questions
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@item set confirm off
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Disables confirmation requests.
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@item set confirm on
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Enables confirmation requests (the default).
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@item show confirm
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@kindex show confirm
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Displays state of confirmation requests.
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@end table
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