os: Inconsistent EOF error message returned by File.ReadAt on windows

[syndtr]

What steps will reproduce the problem?
1. create file.tmp file
2. run this http://play.golang.org/p/jZkzWF8Npr
3.

What is the expected output?
io.EOF

What do you see instead?
read file.tmp: Reached the end of the file.

Which compiler are you using (5g, 6g, 8g, gccgo)?
6g

Which operating system are you using?
windows 8 64-bit

Which version are you using?  (run 'go version')
go version go1.1rc3 windows/amd64

[peterGo]

Comment 1:

The error message text is OS dependent. The important fact is that, on Windows, io.EOF
is not returned.
package main
import (
    "fmt"
    "io"
    "os"
)
func main() {
    f, err := os.Create("5619.tmp")
    if err != nil {
        fmt.Println(err)
        return
    }
    buf := make([]byte, 10)
    n, err := f.ReadAt(buf, 0)
    fmt.Println(n, err == io.EOF, err)
}
Output:
Linux:
0 true EOF
Windows:
0 false read 5619.tmp: Reached the end of the file.

Attachments:

1. 5619.go (333 bytes)

[syndtr]

Comment 2:

Yes, you're right the error returned should be equal with io.EOF. Otherwise, it would be
hard to detect an EOF.

[alexbrainman]

Comment 3:

Here is a fix proposal https://golang.org/cl/9952044/.
Alex

Labels changed: added os-windows, packagebug.

Owner changed to @alexbrainman.

Status changed to Started.

[alexbrainman]

Comment 4:

This issue was closed by revision bb6e265.

Status changed to Fixed.

[bradfitz]

Comment 5:

Issue #6277 has been merged into this issue.

[alexbrainman]

Comment 6:

Issue #6277 has been merged into this issue.