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NAME
     xscope - X Window Protocol Viewer

SYNOPSIS
     xscope [ -i input-port ] [ -o output-port ] [ -h host ] [ -d
     display ] [ -q ] [ -v print-level ]

DESCRIPTION
     Xscope sits in-between an X11 client and an X11  server  and
     prints  the contents of each request, reply, error, or event
     that is communicated between them.  This information can  be
     useful  in  debugging  and performance tuning of X11 servers
     and clients.

     To operate, xscope must know the host, port, and display  to
     use to connect to the X11 server.  In addition, it must know
     the port on which it should listen  for  X11  clients.   Two
     cases are common:

     (1)  The X11 server is on the same host as xscope.  In  this
          case,  the  input port for xscope should be selected as
          an X11 server on a different display,  and  the  client
          DISPLAY  argument  adjusted to select xscope. For exam-
          ple, if the X11 server is on port 6000, display 0, then
          xscope can use port 6001 as its input port.  The client
          can use display 0 for direct access to X11 or display 1
          for access to xscope.

     (2)  The X11 server is on a different host than  xscope.  In
          this  case the same input and output ports can be used,
          and the host component of the DISPLAY is used to select
          xscope or X11.

OPTIONS
     -i input-port
               Specify the port that  xscope  will  use  to  take
               requests  from  clients (defaults to 1).  For X11,
               this port is automatically biased by 6000.

     -o output-port
               Determines the port that xscope will use  to  con-
               nect to X11 (defaults to 0). For X11, this port is
               automatically biased by 6000.

     -h host   Determines the host that xscope will use  to  find
               its X11 server.

     -d display
               Defines the display number.  The display number is
               added  to  the  input  and output port to give the
               actual ports which are used by xscope.

     -q        Quiet  output  mode.   Gives  only  the  names  of
               requests,  replies,  errors,  and events, but does
               not indicate contents.

     -v print-level
               Determines the level of printing which xscope will
               provide.   The print-level can be 0 (same as quiet
               mode), 1, 2, 3, 4.  The larger numbers  give  more
               and  more output.  For example, a successful setup
               returns a string which is the name of  the  vendor
               of the X11 server.  At level 1, the explicit field
               giving the length  of  the  string  is  suppressed
               since  it  can  be  inferred  from the string.  At
               level  2  and  above  the  length  is   explicitly
               printed.

EXAMPLES
     xscope -i1 -o0  <  /dev/null  >&  /tmp/xscope.out  &  client
     -display localhost:1

     This command would  have  xscope  communicate  with  an  X11
     server on the local host, display 0;  xscope itself would be
     available on the current host as display  1  (display  of  0
     plus  the  1  of -i1). The standard input is redirected from
     /dev/null to prevent xscope from stopping when put into  the
     background.  Output is redirected to a file in /tmp.

     xscope -v4 -hcleo -d0 -o0 -i1

     This command would  have  xscope  communicate  with  an  X11
     server  on host ``cleo'', display 0;  xscope itself would be
     available on the current host as display  1  (display  of  0
     plus the 1 of -i1). Verbose level 4.

     xscope -q -d1 -o1 -o3

     The X11 server for the current host, display 2  (1  for  -d1
     plus  1  for -o1) would be used by xscope which would run as
     display 4 (1 for -d1 plus 3 for -o3).  Quiet  mode  (verbose
     level 0).

SEE ALSO
     X11(7)

AUTHOR
     James L. Peterson (MCC)

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