Add epoll(2) from Theodore Preduta as part of GSoC 2023

fix various typos in comments and log messages.

remove fake closefrom()

librumphijack: fix typo for NetBSD < 5.99.7

Ignore closefrom(3) for now; too complicated to descern between regular
and rump fds.

- implement pselect so that the ssh test has a chance to work
- 1 -> EXIT_FAILURE
- more info about fds

Add pathconf and lpathconf (fixes lib/librumphijack/nfs test which uses ls
which now uses lpathconf)

Change types of DUP2ALIAS and DUP2FDMASK bit masks to unsigned

This is for consistency with the DUP2BIT change.

Avoid unportable bit shift semantics

hijack.c:451:52, left shift of 1 by 31 places cannot be represented in type 'int

teach hijack about the new vfs syscalls

Linux doesn't have paccept().

Add an option "modctl" to capture modctl().

rumphijack: don't modify a cmsg on just validating it

Pointed out by k-goda@IIJ

Provide better debug messages for ioctl

since ln(1) now uses linkat(2) provide a dumb wrapper.

Support paccept for nc

fix test lib/librumphijack/t_sh/runscript
(handle F_DUPFD_CLOEXEC that the shell is now using)

Object to dup2() if target fd is in the range of fd's that
librumphijack reserves for rump to use.

This is not normally a problem, as most applications don't attempt
to use very high fds - but /bin/

Object to dup2() if target fd is in the range of fd's that
librumphijack reserves for rump to use.

This is not normally a problem, as most applications don't attempt
to use very high fds - but /bin/sh does.

This fix is something of a kludge - really the apparent fd resource limit
ought to be lowered as well, but this is sufficient to allow the shell
to work (when its dup2() gets rejected, it just tries again with a smaller
target fd until it eventually succeeds.) This fixes the librumphijack
shell ATF tests.

A better, more comprehensive, fix would be good...

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Remember that dlsym() tends to fail on PowerPC during init (or at least
tended), so call rumphijack_dlsym() instead to be safe.

allow mmap() to be called before init runs

Define the expansion of the VFORK macro, not the symbol `VFORK'.

Fixes hijacking processes that vfork and exec. Symptom was the child
would spin with read/EAGAIN <-> kevent/EBADF because the inheri

Define the expansion of the VFORK macro, not the symbol `VFORK'.

Fixes hijacking processes that vfork and exec. Symptom was the child
would spin with read/EAGAIN <-> kevent/EBADF because the inheritance
mechanism relied on setting the holyfd to -1 on fork...which didn't
happen if we didn't hijack vfork.

ok pooka@

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Wrap utimensat() only if present on host

fixes buildrump.sh on NetBSD 6.1.5

Make ATCALL() behave for absolute paths too.

Define a generic ATCALL() and use it to implement utimensat()

Also hijack futimens(2) so that t_sh test passes.