[PATCH] Prepare pflocal/io.c for a revised hurdselect.c: Pipe case (for review)

[Svante Signell]

Hello,

Attached is a patch for review adding return values of pflocal/io.c for
the case of pipes to detect broken ones. With an upgraded
hurdselect.c:poll() (in the works) the test from e.g. gnulib passes.
Remaning work is to solve the corresponding problem for sockets in
pfinet (and eventually also for pflocal).

Thanks!

pflocal_io.c.patch
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