Added a section about errno values vs normal go
error value semantics, and checking the return
value of C functions for error before looking at
errno.
Fixes #63485
Change-Id: Id0132a9f11e4127f4adc14e010b7e17f57a0f7d3
Reviewed-on: https://go-review.googlesource.com/c/go/+/616264 Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Ian Lance Taylor <iant@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com>