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net: document that DNSError.Timeout and Temporary are unreliable

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Update #10417.

Change-Id: Ibfbdd05358f696a37217eef160f71b14a468ff86
Reviewed-on: https://go-review.googlesource.com/8788
Reviewed-by: Rob Pike <r@golang.org>
This commit is contained in:
Ian Lance Taylor 2015-04-11 10:30:13 -07:00
parent 67805eaa95
commit 63cced7b31
1 changed files with 9 additions and 2 deletions
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11
src/net/dnsclient.go
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@ -14,7 +14,7 @@ type DNSError struct {
Err string // description of the error Err string // description of the error
Name string // name looked for Name string // name looked for
Server string // server used Server string // server used
IsTimeout bool IsTimeout bool // if true, timed out; not all timeouts set this
} }
func (e *DNSError) Error() string { func (e *DNSError) Error() string {
@ -29,7 +29,14 @@ func (e *DNSError) Error() string {
return s return s
} }
func (e *DNSError) Timeout() bool { return e.IsTimeout } // Timeout reports whether the DNS lookup is known to have timed out.
// This is not always known; a DNS lookup may fail due to a timeout
// and return a DNSError for which Timeout returns false.
func (e *DNSError) Timeout() bool { return e.IsTimeout }
// Temporary reports whether the DNS error is known to be temporary.
// This is not always known; a DNS lookup may fail due to a temporary
// error and return a DNSError for which Temporary returns false.
func (e *DNSError) Temporary() bool { return e.IsTimeout } func (e *DNSError) Temporary() bool { return e.IsTimeout }
const noSuchHost = "no such host" const noSuchHost = "no such host"