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 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 `gdbserver' 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 isn't necessary 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 example:

	    (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 communicate 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 Debugger, 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 permission notice identical to this one.

       Permission  is  granted	to  copy and distribute translations of this manual into another language, under the above conditions for modified
       versions, except that this permission notice may be included in translations approved by the Free Software Foundation  instead  of  in  the
       original English.

Cygnus Support							  2 November 1993						      gdbserver(1)