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gdbserver(1)		     GNU Development Tools		  gdbserver(1)

       gdbserver - Remote Server for the GNU Debugger

	      tty prog [args...]

       gdbserver tty --attach PID

       GDBSERVER  is  a	 program that allows you to run	GDB on a different ma-
       chine 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 doesn't 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

	    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 ig-
       nored.)	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 sys-
       tem.  This same port number must	be used	in the host GDBs  `target  re-
       mote' 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 isn't	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 it's 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'.  It's argument is either a	device name (usually a
       serial device, like `/dev/ttyb'), or a HOST:PORT	descriptor.  For exam-

	    (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 us-
       ing the `target remote' command,	otherwise you may get  an  error  that
       looks something like `Connection	refused'.

       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 ar-
       guments will be passed to the program verbatim.

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

       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 en-
       tire resulting derived work is distributed under	the terms of a permis-
       sion 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)


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