tree 9c93d363daf422261e2caae9319a58a90654d31a
parent aeab40317415468323ef45095f2090ff90c3ecd2
author Ian Lance Taylor <iant@golang.org> 1589945038 -0700
committer Ian Lance Taylor <iant@golang.org> 1590011554 +0000

syscall: preserve Windows file permissions for O_CREAT|O_TRUNC

On Windows, calling syscall.Open(file, O_CREAT|O_TRUNC, 0) for a file
that already exists would change the file to be read-only.
That is not how the Unix syscall.Open behaves, so avoid it on
Windows by calling CreateFile twice if necessary.

Fixes #38225

Change-Id: I70097fca8863df427cc8a97b9376a9ffc69c6318
Reviewed-on: https://go-review.googlesource.com/c/go/+/234534
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>