libc: INTERPOS_SYS macro for interposed syscalls

This macro makes uses the __sys_<foo>_t typedefs from libsys.h to
greatly simplify calling functions in the interposing table.

Reviewed by: kib
Diff

libc: INTERPOS_SYS macro for interposed syscalls

This macro makes uses the __sys_<foo>_t typedefs from libsys.h to
greatly simplify calling functions in the interposing table.

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D44389

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libsys: make __libsys_interposing static

Access __libsys_interposing with __libc_interposing_slot() in all
cases to support a move of these wrappers back to libc.

Reviewed by: kib
Differential Revi

libsys: make __libsys_interposing static

Access __libsys_interposing with __libc_interposing_slot() in all
cases to support a move of these wrappers back to libc.

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D44239

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libsys: fix sleep(3)/usleep(3) cancel behavior

Move functions back to libc/gen sources; they are only versioned from
libc and not libsys.
Access libsys interposing slots using __libsys_interposing_s

libsys: fix sleep(3)/usleep(3) cancel behavior

Move functions back to libc/gen sources; they are only versioned from
libc and not libsys.
Access libsys interposing slots using __libsys_interposing_slot()
instead of direct __libsys_interposing array dereference, which cannot
work from libc.

Reported by: glebius
Reviewed by: brooks
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D44042

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