[Bug 247102] getlogin_r(): Sort of a typo: int is actually a size_t

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247102

--- Comment #10 from commit-hook at FreeBSD.org ---
A commit references this bug:

Author: kevans
Date: Wed Sep  9 18:07:14 UTC 2020
New revision: 365506
URL: https://svnweb.freebsd.org/changeset/base/365506

Log:
  getlogin_r: fix the type of len

  getlogin_r is specified by POSIX to to take a size_t len, not int. Fix our
  version to do the same, bump the symbol version due to ABI change and
  provide compat.

  This was reported to break compilation of Ruby 2.8.

  Some discussion about the necessity of the ABI compat did take place in the
  review. While many 64-bit platforms would likely be passing it in a 64-bit
  register and zero-extended and thus, not notice ABI breakage, some do
  sign-extend (e.g. mips).

  PR:           247102
  Submitted by: Bertram Scharpf <software at bertram-scharpf.de> (original)
  Submitted by: cem (ABI compat)
  MFC after:    1 week
  Differential Revision:        https://reviews.freebsd.org/D26335

Changes:
  head/include/unistd.h
  head/lib/libc/gen/Symbol.map
  head/lib/libc/gen/getlogin.c
  head/lib/libc/sys/getlogin.2

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