lib{c,sys}: return wrapped syscall APIs to libc

These provide standard APIs, but are implemented using another system
call (e.g., pipe implemented in terms of pipe2) or are interposed by the
threadi

lib{c,sys}: return wrapped syscall APIs to libc

These provide standard APIs, but are implemented using another system
call (e.g., pipe implemented in terms of pipe2) or are interposed by the
threading library to support cancelation.

After discussion with kib (see D44111), I've concluded that it is
better to keep most public interfaces in libc with as little
as possible in libsys.

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D44241

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lib{c,sys}: expose _getlogin consistently

Historically we exposed _getlogin as a private symbol on a per-arch basis
(except on aarch64 and riscv) for no obvious reason. We now need to
expose it for

lib{c,sys}: expose _getlogin consistently

Historically we exposed _getlogin as a private symbol on a per-arch basis
(except on aarch64 and riscv) for no obvious reason. We now need to
expose it for libc's use so remove the special case from
makesyscalls.lua and expose it in the generated syscalls.map.

Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D44116

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libc: move MD sys related symbols to libsys

This is a mix genuine MD interfaces and compat symbols like _getlogin.

Reviewed by: kib, emaste, imp
Pull Request: https://github.com/freebsd/freebsd-src

libc: move MD sys related symbols to libsys

This is a mix genuine MD interfaces and compat symbols like _getlogin.

Reviewed by: kib, emaste, imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/908

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