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os: document that File.Seek works on directories, but not portably

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Updates #36019

Change-Id: I9fea2c3c5138e2233290979e4724f6e7b91da652
Reviewed-on: https://go-review.googlesource.com/c/go/+/213439
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Brad Fitzpatrick 2020-01-06 16:30:48 +00:00
parent d6bf2d7b83
commit 6b1a3f73ed
1 changed files with 4 additions and 0 deletions
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4
src/os/file.go
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@ -204,6 +204,10 @@ func (f *File) WriteAt(b []byte, off int64) (n int, err error) {
// relative to the current offset, and 2 means relative to the end.
// It returns the new offset and an error, if any.
// The behavior of Seek on a file opened with O_APPEND is not specified.
//
// If f is a directory, the behavior of Seek varies by operating
// system; you can seek to the beginning of the directory on Unix-like
// operating systems, but not on Windows.
func (f *File) Seek(offset int64, whence int) (ret int64, err error) {
if err := f.checkValid("seek"); err != nil {
return 0, err