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doc: document opening hidden files on Windows #15409

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doc: document opening hidden files on Windows
bzoz Sep 14, 2017
becc0b4
reword
bzoz Sep 18, 2017
876d70d
fixup: clarify truncate call
bzoz Oct 2, 2017
ada4383
fixup: only r+
bzoz Oct 3, 2017
8734b99
fixup: ftruncate instead of truncate
bzoz Oct 3, 2017
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5 changes: 5 additions & 0 deletions doc/api/fs.md
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Expand Up @@ -102,6 +102,11 @@ example `fs.readdirSync('c:\\')` can potentially return a different result than
`fs.readdirSync('c:')`. For more information, see
[this MSDN page][MSDN-Rel-Path].

*Note:* On Windows, opening an existing hidden file using the `w` flag (either
through `fs.open` or `fs.writeFile`) will fail with `EPERM`. Existing hidden
files can be opened for writing with the `r+` flag. A call to `fs.ftruncate` can
be used to reset the file contents.

## Threadpool Usage

Note that all file system APIs except `fs.FSWatcher()` and those that are
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