1 package p9p
2 
3 import (
4 	"errors"
5 	"fmt"
6 )
7 
8 // MessageRerror provides both a Go error type and message type.
9 type MessageRerror struct {
10 	Ename string
11 }
12 
13 // 9p wire errors returned by Session interface methods
14 var (
15 	ErrBadattach    = new9pError("unknown specifier in attach")
16 	ErrBadoffset    = new9pError("bad offset")
17 	ErrBadcount     = new9pError("bad count")
18 	ErrBotch        = new9pError("9P protocol botch")
19 	ErrCreatenondir = new9pError("create in non-directory")
20 	ErrDupfid       = new9pError("duplicate fid")
21 	ErrDuptag       = new9pError("duplicate tag")
22 	ErrIsdir        = new9pError("is a directory")
23 	ErrNocreate     = new9pError("create prohibited")
24 	ErrNomem        = new9pError("out of memory")
25 	ErrNoremove     = new9pError("remove prohibited")
26 	ErrNostat       = new9pError("stat prohibited")
27 	ErrNotfound     = new9pError("file not found")
28 	ErrNowrite      = new9pError("write prohibited")
29 	ErrNowstat      = new9pError("wstat prohibited")
30 	ErrPerm         = new9pError("permission denied")
31 	ErrUnknownfid   = new9pError("unknown fid")
32 	ErrBaddir       = new9pError("bad directory in wstat")
33 	ErrWalknodir    = new9pError("walk in non-directory")
34 
35 	// extra errors not part of the normal protocol
36 
37 	ErrTimeout       = new9pError("fcall timeout") // returned when timing out on the fcall
38 	ErrUnknownTag    = new9pError("unknown tag")
39 	ErrUnknownMsg    = new9pError("unknown message")    // returned when encountering unknown message type
40 	ErrUnexpectedMsg = new9pError("unexpected message") // returned when an unexpected message is encountered
41 	ErrWalkLimit     = new9pError("too many wnames in walk")
42 	ErrClosed        = errors.New("closed")
43 )
44 
45 // new9pError returns a new 9p error ready for the wire.
46 func new9pError(s string) error {
47 	return MessageRerror{Ename: s}
48 }
49 
50 // Type ensures that 9p errors can be transparently used as a 9p message in an
51 // Fcall.
52 func (MessageRerror) Type() FcallType {
53 	return Rerror
54 }
55 
56 func (e MessageRerror) Error() string {
57 	return fmt.Sprintf("9p: %v", e.Ename)
58 }