windows: add GetProcessId function

ref:
https://docs.microsoft.com/en-us/windows/desktop/api/processthreadsapi/nf-processthreadsapi-getprocessid

Document does not say anything about return value, but when I use 0 for HANDLE, GetProcessId
returns 0 with ERROR_INVALID_HANDLE from GetLastError().

Change-Id: Ib6782ccd5a4917e93ddbcf18c533921b12c67e3b
Reviewed-on: https://go-review.googlesource.com/c/sys/+/180924
Reviewed-by: Marc-Antoine Ruel <maruel@google.com>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2 files changed
tree: 54b39f0affedf60fa55aee49c028b572c0300832
  1. cpu/
  2. plan9/
  3. unix/
  4. windows/
  5. .gitattributes
  6. .gitignore
  7. AUTHORS
  8. codereview.cfg
  9. CONTRIBUTING.md
  10. CONTRIBUTORS
  11. go.mod
  12. LICENSE
  13. PATENTS
  14. README.md
README.md

sys

This repository holds supplemental Go packages for low-level interactions with the operating system.

Download/Install

The easiest way to install is to run go get -u golang.org/x/sys. You can also manually git clone the repository to $GOPATH/src/golang.org/x/sys.

Report Issues / Send Patches

This repository uses Gerrit for code changes. To learn how to submit changes to this repository, see https://golang.org/doc/contribute.html.

The main issue tracker for the sys repository is located at https://github.com/golang/go/issues. Prefix your issue with “x/sys:” in the subject line, so it is easy to find.