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XPA Changes - Changes For Users from XPA 1.0 and 2.0
This document describes changes that will affect users who migrate from
XPA 1.0 to XPA 2.0.
There have been a few changes that affect users who upgrade XPA from
version 1.0 to version 2.0. These changes are detailed below.
· XPA commands no longer have a resolver routine (this is open to
negotiations, but we decided the idea was dumb). For the SAOtng
program, this means that you have explicitly specify the fits
access point, i.e.,:
cat foo.fits │ xpaset SAOtng fits
cat foo.fits │ xpaset SAOtng
· By default, xpaset, xpaget, etc. now wait for the server callback
to complete; i.e., the old -W is implied (and the switch is
ignored). This allows support for better error handling. If you
want xpaset, etc. to return before the callback is complete, use
echo "file foo.fits" │ xpaset -n SAOtng
· The old -w switch in xpaset and xpaget is no longer necessary (and
is ignored), since you can have more than one process communicating
with an xpa access point at one time.
· The new -p switch on xpaset means you need not read from stdout:
xpaset -p SAOtng colormap I8
will send the paramlist to the SAOtng callback without reading from
See xpa(n) for a list of XPA help pages