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Add caveat about support for sync flags #560

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Add caveat about support for sync flags #560

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19 changes: 15 additions & 4 deletions legacy/preview1/docs.md
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Original file line number Diff line number Diff line change
Expand Up @@ -663,7 +663,11 @@ Append mode: Data written to the file is always appended to the file's end.
Bit: 0

- <a href="#fdflags.dsync" name="fdflags.dsync"></a> `dsync`: `bool`
Write according to synchronized I/O data integrity completion. Only the data stored in the file is synchronized.
Write according to synchronized I/O data integrity completion. Only the data
stored in the file is synchronized. This feature is not available on all
platforms and therefore [`path_open`](#path_open) and other such functions which
accept [`fdflags`](#fdflags) may return [`errno.notsup`](#errno.notsup) in the
case that this flag is set.

Bit: 1

Expand All @@ -674,13 +678,20 @@ Bit: 2

- <a href="#fdflags.rsync" name="fdflags.rsync"></a> `rsync`: `bool`
Synchronized read I/O operations.
This feature is not available on all platforms and therefore
[`path_open`](#path_open) and other such functions which accept
[`fdflags`](#fdflags) may return [`errno.notsup`](#errno.notsup) in the case
that this flag is set.

Bit: 3

- <a href="#fdflags.sync" name="fdflags.sync"></a> `sync`: `bool`
Write according to synchronized I/O file integrity completion. In
addition to synchronizing the data stored in the file, the implementation
may also synchronously update the file's metadata.
Write according to synchronized I/O file integrity completion. In addition to
synchronizing the data stored in the file, the implementation may also
synchronously update the file's metadata. This feature is not available on all
platforms and therefore [`path_open`](#path_open) and other such functions which
accept [`fdflags`](#fdflags) may return [`errno.notsup`](#errno.notsup) in the
case that this flag is set.

Bit: 4

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