xdpyinfo: Changes to 'master'

[Alan Coopersmith]

 configure.ac |    2 +-
 xdpyinfo.c   |   56 ++++++++++++++++++++++++++++++++++++++++++++------------
 2 files changed, 45 insertions(+), 13 deletions(-)

New commits:
commit 072fc46b2af370e78fa53426626ca3c33b74bdf2
Author: Alan Coopersmith <alan.coopersmith at oracle.com>
Date:   Sun Oct 3 11:47:07 2010 -0700

    Use xcb for -queryExt instead of a round-trip per extension
    
    On a system with 30 extensions listed by xdpyinfo, truss -c
    reports this saves quite a few system calls by batching the
    QueryExtension requests instead of a round-trip for each one:
    
                          Xlib      xcb
    writev                  40       11
    poll                    80       22
    recv                   117       29
    total (*)              464      296
    
    (*) total includes all system calls, including many not shown since
    their count did not change significantly.   There was one additional
    set of open/mmap/close etc. for loading the added libX11-xcb library.
    
    Over a tcp connection, this reduced both the number of packets,
    and due to tcp packet header overhead, the overall amount of data:
    
                          Xlib      xcb
    TCP packets             93       35
    TCP bytes            11554     7726
    
    Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>
    Reviewed-by: Jamey Sharp <jamey at minilop.net>