tree c20c9a2c21ac5c7115b8fb1fae80720591ab499a
parent 884614c24f8c04ebde9c72ec7ce8f50498e3cdae
author David Benjamin <davidben@google.com> 1592330767 -0400
committer CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> 1592340502 +0000

Abstract fd operations better in tool.

Windows and POSIX implement very similar fd operations, but differ
slightly:

- ssize_t in POSIX is usually int on Windows.
- POSIX needs EINTR retry loops.
- Windows wants _open rather than open, etc.
- POSIX fds and sockets are the same thing, while Windows sockets are
  HANDLEs and leaves fd as a C runtime construct.

Rather than ad-hoc macros and redefinitions of ssize_t (which reportedly
upset MINGW), add some actual abstractions. While I'm here, add a scoped
file descriptor type.

That still leaves recv/send which are only used in one file, so defined
a socket_result_t for them.

Change-Id: I17fca2a50c77191f573852bfd27553996e3e9c3f
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/41725
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: Adam Langley <agl@google.com>