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RedHat 9 (Linux i386) - man page for gpm (redhat section 8)

GPM(8)				     System Manager's Manual				   GPM(8)

       gpm - a cut and paste utility and mouse server for virtual consoles

       gpm [ options ]

       This  package tries to be a useful mouse server for applications running on the Linux con-
       sole.  It is based on the "selection" package, and some of its code comes  from	selection
       itself. This package is intended as a replacement for "selection" as a cut-and-paste mech-
       anism; it also provides additional facilities. The "selection" package offered  the  first
       cut-and-paste  implementation  for  Linux  using  two mouse buttons, and the cut buffer is
       still called "selection buffer" or just "selection" throughout this document.  The  infor-
       mation below is extracted from the texinfo file, which is the preferred source of informa-

       The `gpm' executable is meant to act like a daemon (thus, `gpmd' would be  a  better  name
       for  it).  This section is meant to describe the command-line options for `gpm', while its
       internals are outlined in the next section.

       Due to restrictions in the `ioctl(TIOCLINUX)' system call, `gpm' must be run by the  supe-
       ruser.  The  restrictions  have	been added in the last 1.1 kernels to fix a security hole
       related to selection and screen dumping.

       The server can be configured to match the user's taste,	and  any  application  using  the
       mouse  will  inherit the server's attitude. From release 1.02 up to 1.19.2 is was possible
       for any user logged on the system console to change the mouse feeling using the -q option.
       This is no longer possible for security reasons.

       As  of  0.97  the server program puts itself in the background. To kill `gpm' you can just
       reinvoke it with the `-k' cmdline switch, although `killall gpm' can be a better choice.

       Version 1.10 adds the capability to execute special  commands  on  certain  circumstances.
       Special	commands  default  to  rebooting and halting the system, but the user can specify
       his/her personal choice. The capability to invoke commands using the mouse is a handy  one
       for  programmers,  because it allows to issue a clean shutdown when the keyboard is locked
       and no network is available to restore the system to a sane state.

       Special commands are toggled by triple-clicking the left and right button --  an  unlikely
       event  during  normal  mouse usage. The easiest way to triple-click is pressing one of the
       buttons and triple-click the other one. When special  processing  is  toggled,  a  message
       appears	on  the console (and the speaker beeps twice, if you have a speaker); if the user
       releases all the buttons and presses one of them again within three seconds, then the spe-
       cial command corresponding to the button is executed.

       The default special commands are:

       left button
	      Reboot the system by signalling the init process

       middle button (if any)
	      Execute `/sbin/shutdown -h now'

       right button
	      Execute `/sbin/shutdown -r now'

       The  `-S'  command line switch enables special command processing and allows to change the
       three special commands. To accept the default commands use `-S ""' (i.e., specify an empty
       argument).   To	specify your own commands, use a colon-separated list to specify commands
       associated to the left, middle and right button. If any of the commands is  empty,  it  is
       interpreted  as	`send  a  signal  to the init process'. This particular operation is sup-
       ported, in addition to executing external commands, because sometimes  bad  bugs  put  the
       system  to  the impossibility to fork; in these rare case the programmer should be able to
       shutdown the system anyways, and killing init from a running process is the only way to do

       As  an  example, `-S ":telinit 1:/sbin/halt"', associates killing init to the left button,
       going single user to the middle one, and halting the system to the right button.

       System administrators should obviously be careful about special commands, as gpm runs with
       superuser  permissions.	Special commands are best suited for computers whose mouse can be
       physically accessed only by trusted people.

       Available command line options are the following:

       -a accel
	      Set the acceleration value used when a single motion event  is  longer  than  delta
	      (see `-d').

       -A [limit]
	      Start  up with selection pasting disabled.  This is intended as a security measure;
	      a plausible attack on a system seems to be to stuff a nasty shell command into  the
	      selection  buffer  (`rm  -rf /') including the terminating line break, then all the
	      victim has to do is click the middle mouse button ..  As of  version  1.17.2,  this
	      has developed into a more general aging mechanism; the gpm daemon can disable (age)
	      selection pasting automatically after a period of inactivity.  To enable this  mode
	      just  give the optional limit parameter which is interpreted as the time in seconds
	      for which a selection is considered valid and pastable.  As of  version  1.15.7,	a
	      trivial  program	called	`disable-paste'  is  provided. The following makes a good
	      addition to `/etc/profile' if you allow multiple users to work on your console.

       `case $( /usr/bin/tty ) in
       /dev/tty[0-9]*) /usr/bin/disable-paste ;;

       -b baud
	      Set the baud rate.

       -B sequence
	      Set the button sequence. `123' is the normal sequence, `321' can be used	by  left-
	      handed  people,  and  `132'  can	be useful with two-button mice (especially within
	      Emacs). All the button permutations are allowable.

       -d delta
	      Set the delta value. When a single motion event is longer than delta, accel is used
	      as a multiplying factor. (Must be 2 or above)

       -D     Do  not  automatically enter background operation when started, and log messages to
	      the standard error stream, not the syslog mechanism.  This is useful for debugging;
	      in previous releases it was done with a compile-time option.

       -g number
	      With glidepoint devices, emulate the specified button with tapping.  number must be
	      `1', `2', or `3', and refers to the button number before the `-B' button	remapping
	      is  performed.  This option applies to the mman and ps2 decoding. No button is emu-
	      lated by default because the ps2 tapping is incompatible with some normal ps2 mice

       -h     Print a summary of command line options.

       -i interval
	      Set interval to be used as an upper time limit for multiple clicks. If the interval
	      between  button-up  and button-down events is less than limit, the press is consid-
	      ered a double or triple click. Time is in milliseconds.

       -k     Kill a running gpm. This can be used by busmouse users to kill gpm before running X
	      (unless they use `-R' or the single-open limitation is removed from the kernel).

       -l charset
	      Choose  the `inword()' look up table. The charset argument is a list of characters.
	      `-' is used to specify a range and `\ ' is used to escape the next character or  to
	      provide  octal codes.  Only visible character can appear in charset because control
	      characters can't appear in text-mode video memory, whence selection is cut.

       -m filename
	      Choose the mouse file to open. It defaults to `/dev/mouse'.

       -M     Enable multiple mode. The daemon will read two different mouse devices.  Any subse-
	      quent  option  will  refer to the second device, while any preceding option will be
	      used for the first device. This option automatically  forces  the  repeater  (`-R')
	      option on.

       -o list-of-extra-options
	      The  option  works  similary to the ``-o'' option of mount; it is used to specify a
	      list of ``extra options'' that are specific to each mouse type. The list is  comma-
	      separated. The options `dtr', `rts' or `both' are used by the serial initialization
	      to toggle the modem lines like, compatibly with earlier gpm versions; note  however
	      that  using -o dtr associated with non-plain-serial mouse types may now generate an

       -p     Forces the pointer to be visible while selecting. This is the behaviour of  `selec-
	      tion-1.7',  but it is sometimes confusing.  The default is not to show the pointer,
	      which can be confusing as well.

       -r number
	      Set the responsiveness. A higher responsiveness is used for a faster cursor motion.

       -R name
	      Causes `gpm' to act as a repeater: any mouse data received while	in  graphic  mode
	      will  be	produced  on the fifo `/dev/gpmdata' in protocol name.	In principle, you
	      can use the same names as for the `-t' option, although repeating into some  proto-
	      cols may not be implemented for a while.	In addition, you can specify `raw' as the
	      name, to repeat the mouse data byte by byte, without any protocol translation.   If
	      name is omitted, it defaults to `msc'.  Using gpm in repeater mode, you can config-
	      ure the X server to use its fifo as a mouse device. This option is useful for  bus-
	      mouse owners to override the single-open limitation. It is also an easy way to man-
	      age those stupid dual-mode mice which force you to  keep	the  middle  button  down
	      while changing video mode. The option is forced on by the `-M' option.

       -s number
	      Set the sample rate for the mouse device.

       -S commands
	      Enable  special-command  processing,  and  optionally  specify custom commands as a
	      colon-separated list. See above for a detailed description of special commands.

       -t name
	      Set the mouse type. Use `-t help' to get a list of allowable types.  Since  version
	      1.18.1,  the  list  also	shows  which protocols are available as repeaters (see -R
	      above), by marking them with an asterisk (``*'').

       -v     Print version information and exit.

       -V verbosity increment
	      Raise or decrease the maximum level of messages that will be logged.  Thus a  posi-
	      tive argument has the effect of making the program more verbose.	One can also give
	      a negative argument to hush the program; however, note that due to getopt(3)  rules
	      a  negative  argument must follow the option with no space betwixt (that is, `-V-1'
	      but not `-V -1').  The argument is optional and its default value  is  1.   Default
	      verbosity level is 5 (`LOG_NOTICE').

       -2     Force  two  buttons. This means that the middle button, if any, will be taken as it
	      was the right one.

       -3     Force three buttons. By default the mouse is considered  to  be  a  2-buttons  one,
	      until  the  middle  button is pressed. If three buttons are there, the right one is
	      used to extend the selection, and the middle one is used to paste it.   Beware:  if
	      you  use	the  `-3'  option  with a 2-buttons mouse, you won't be able to paste the

       To select text press the left mouse button and drag the mouse.  To paste text in the  same
       or  another  console,  press  the  middle  button.  The right button is used to extend the
       selection, like in `xterm'.

       Two-button mice use the right button to paste text.

       Double and triple clicks select whole word and whole lines. Use of the `-p' option is rec-
       ommended for best visual feedback.

       If  a trailing space after the contents of a line is highlighted, and if there is no other
       text on the remainder of the line, the rest of the line will be selected automatically. If
       a  number  of lines are selected, highlighted trailing spaces on each line will be removed
       from the selection buffer.

       Any output on the virtual console holding the selection will clear the highlighted  selec-
       tion  from  the screen, to maintain integrity of the display, although the contents of the
       paste buffer will be unaffected.

       The selection mechanism is disabled if the controlling virtual console is placed in graph-
       ics  mode, for example when running X11, and is re-enabled when text mode is resumed. (But
       see BUGS section below.)

       The `gpm' server may have problems interacting with X: if  your	mouse  is  a  single-open
       device (i.e. a bus mouse), you should kill `gpm' before starting X, or use the `-R' option
       (see above).  To kill `gpm' just invoke `gpm -k'. This problem  doesn't	apply  to  serial

       Two  instances  of  gpm	can't  run  on the same system. If you have two mice use the `-M'
       option (see above).

       While the current console is in graphic mode, `gpm' sleeps until text mode is back (unless
       `-R'  is  used). Thus, it won't reply to clients. Anyways, it is unlikely that mouse-eager
       clients will spur out in hidden consoles.

       Andrew Haylett <ajh@gec-mrc.co.uk> (the original selection code)
       Alessandro Rubini <rubini@linux.it> (new features)
       Ian Zimmerman <itz@speakeasy.org> (co-maintainer)

       Many many contributors, to both selection and gpm.

       The maintainers are Alessandro Rubini and Ian Zimmerman.   The  development  mailing  list
       (and  the  CVS  tree)  are  hosted  by  Prosa Srl, which we thank. The mailing list can be
       reached as gpm@prosa.it.  More information on the list and CVS is in the README file  part
       of the source distribution of gpm.

       /dev/mouse      The default mouse device
       /var/run/gpm.pid The PID of the running gpm
       /dev/gpmctl     A control socket for clients
       /dev/gpmdata    The fifo written to by a repeater (`-R') daemon.

	mev(1)	    A sample client for the gpm daemon.
	gpm-root(1)  An handler for Control-Mouse events.

       The info file about `gpm', which gives more complete information and explains how to write
       a gpm client.

4th Berkeley Distribution		    July 2000					   GPM(8)

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