tests: add quit_waiter_pipe and wait_for_eof

These generalize the idiom from t/httpd-unix.t and allows them
to be used for all the lei daemon shutdown in tests.  This
speeds up the serialized run of `prove -lvw t/lei.t t/lei-daemon.t'
by roughly 8-9% or so since we're no longer sleeping and killing
the daemon in a loop.

Parallelized `make check' and `make check-run' don't show much
difference, yet.

Note that we do eliminate some kill(2) checks since those still
require retries an delays.  We assume the kernel auto-closing
FDs on process exit is a strong-enough guarantee that the
process will soon be reaped by PID:1.

These will be useful for the FUSE daemons, as well.

We'll also start introducing more uses of autodie to simplify
our code.

0 files changed, 0 insertions, 0 deletions