gdbserver(1)		     GNU Development Tools		  gdbserver(1)



NAME
       gdbserver - Remote Server for the GNU Debugger

SYNOPSIS
       gdbserver
	      tty prog [args...]

       gdbserver tty --attach PID

DESCRIPTION
       GDBSERVER  is  a  program  that	allows	you  to run GDB on a different
       machine than the one which is running the program being debugged.

       Usage (server (target) side):

       First, you need to have a copy of the program you  want	to  debug  put
       onto  the  target system.  The program can be stripped to save space if
       needed, as GDBserver doesnt care about symbols.	All  symbol  handling
       is taken care of by the GDB running on the host system.

       To  use	the server, you log on to the target system, and run the gdb
       server program.	You must tell it (a) how to communicate with GDB, (b)
       the  name  of  your program, and (c) its arguments.  The general syntax
       is:

	    target> gdbserver COMM PROGRAM [ARGS ...]

       For example, using a serial port, you might say:

	    target> gdbserver /dev/com1 emacs foo.txt

       This tells gdbserver to debug emacs with an argument of foo.txt, and to
       communicate  with GDB via /dev/com1.  Gdbserver now waits patiently for
       the host GDB to communicate with it.

       To use a TCP connection, you could say:

	    target> gdbserver host:2345 emacs foo.txt

       This says pretty much the same thing as the last example,  except  that
       we are going to communicate with the host GDB via TCP.  The host:2345
       argument means that we are expecting  to  see  a  TCP  connection  from
       host  to  local	TCP  port  2345.   (Currently,	the  host  part is
       ignored.)  You can choose any number you want for the  port  number  as
       long  as it does not conflict with any existing TCP ports on the target
       system.	This same port number must be used in the  host  GDBs  target
       remote  command,  which	will  be described shortly.  Note that if you
       chose a port number that conflicts with another service, gdbserver will
       print an error message and exit.

       On  some  targets, gdbserver can also attach to running programs.  This
       is accomplished via the --attach argument.  The syntax is:

	    target> gdbserver COMM --attach PID

       PID is the process ID of a currently running process.  It isnt  neces
       sary to point gdbserver at a binary for the running process.

       Usage (host side):

       You  need an unstripped copy of the target program on your host system,
       since GDB needs to examine its symbol tables and such.  Start  up  GDB
       as  you	normally would, with the target program as the first argument.
       (You may need to use the --baud option if the serial line is running at
       anything except 9600 baud.)  Ie: gdb TARGET-PROG, or gdb --baud BAUD
       TARGET-PROG.  After that, the only new command you need to know	about
       is  target  remote.  Its argument is either a device name (usually a
       serial device, like /dev/ttyb), or a HOST:PORT descriptor.  For exam
       ple:

	    (gdb) target remote /dev/ttyb

       communicates with the server via serial line /dev/ttyb, and:

	    (gdb) target remote the-target:2345

       communicates  via  a  TCP connection to port 2345 on host the-target,
       where you previously started up gdbserver with the  same  port  number.
       Note  that  for	TCP  connections, you must start up gdbserver prior to
       using the target remote command, otherwise you may get an error	that
       looks something like Connection refused.

OPTIONS
       You have to supply the name of the program to debug and the tty to com
       municate on; the remote GDB will do  everything	else.	Any  remaining
       arguments will be passed to the program verbatim.

SEE ALSO
       gdb  entry in info; Using GDB: A Guide to the GNU Source-Level Debug
       ger, Richard M. Stallman and Roland H. Pesch, July 1991.

COPYING
       Copyright (c) 1993 Free Software Foundation, Inc.

       Permission is granted to make and distribute verbatim  copies  of  this
       manual  provided  the  copyright  notice and this permission notice are
       preserved on all copies.

       Permission is granted to copy and distribute modified versions of  this
       manual  under  the  conditions  for verbatim copying, provided that the
       entire resulting derived work is distributed under the terms of a  per
       mission notice identical to this one.

       Permission  is granted to copy and distribute translations of this man
       ual into another language, under the above conditions for modified ver
       sions,  except  that this permission notice may be included in transla
       tions approved by the Free Software Foundation instead of in the origi
       nal English.



Cygnus Support			2 November 1993 		  gdbserver(1)