fix typos in word "successful".

msg:
avoid passing the same pointer in multiple arguments for restrict
marked arguments:
- sigaction() wants separate in/out
- use memmove() not memcpy() for overlapping regions (this may fix
a rea

msg:
avoid passing the same pointer in multiple arguments for restrict
marked arguments:
- sigaction() wants separate in/out
- use memmove() not memcpy() for overlapping regions (this may fix
a real bug in nvi -- but it seems unlikely)
- select() wants separate read/write/except
- sigprocmask() wants separate set/oset

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Close all file descriptors before trying to reason about the number of open
descriptors. Should fix the test failures reported on current users.

Return from main() and use EXIT_FAILURE/EXIT_SUCCESS from stdlib(3).

test RUMPHIJACK fdoff=8

print out the unexpected rv too

Create a pipe on which to select. selecting on STDIN_FILENO seems
to be succesful *sometimes* on some archs (i'm suspecting this is
in some way related to lib/libc/ttyio/t_ttyio failing).

check that poll on an invalid fd doesn't hang in the dual poll case

Add test case from PR lib/44552 by Alexander Nasonov. I also lobbed
in a test for select(0, NULL, NULL, NULL, &tv) in there.

add test for fix in rev 1.36 of librumphijack/hijack.c