plan9: lookup query must seek to offset 0 before reading or

       writing /net/dns or /net/cs (see nbd(8)).

R=golang-codereviews
CC=0intro, golang-codereviews, rsc
https://golang.org/cl/49060043

diff --git a/src/pkg/net/lookup_plan9.go b/src/pkg/net/lookup_plan9.go
index a755ff2aacc49e3c3f79dd78b10a2ea522ce9932..95c0f0b0681e454d8728f26dec724d14139e3763 100644 (file)
--- a/src/pkg/net/lookup_plan9.go
+++ b/src/pkg/net/lookup_plan9.go
@@ -16,6 +16,10 @@ func query(filename, query string, bufSize int) (res []string, err error) {
        }
        defer file.Close()
 
+       _, err = file.Seek(0, 0)
+       if err != nil {
+               return
+       }
        _, err = file.WriteString(query)
        if err != nil {
                return