RFC: path display and path filtering features.

[Grant Edwards]

I've re-written the path display/trace features.  Attached is a
snapshot of the diffs against the current git HEAD.  Changes since the
first version I posted follow:

 * Removed the code that tracked fd-table state based on syscalls.  It
   now does a readlink() on /proc/<pid>/fd/<fd> to find the path
   associated with a file descriptor.

 * Change the -P option so that instead of accepting a colon-separated
   list of paths, it accepts a single path.  Multiple -P options can
   be specified to trace multiple paths.

 * Change the way that file descriptors are printed by the display
   functions.  Instead of using "%s" and a function that returns a
   formatted string, they now use a printfd() function analogous to
   the printpath() function.

 * Added handling (for Linux) for system calls where we need to look
   at something other than arg[0] for a descriptor/path.

Feedback is welcome...

-- 
Grant


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