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net: introduce net.Error interface

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Adds two more methods, Timeout and Temporary.
Implemented by os.Errno too.  The intent is to make
the checks for os.EAGAIN a little less clunky.
It should also let us clean up a bug that Mike Solomon
pointed out: if a network server gets an "out of file descriptors"
error from Accept, the listener should not stop.
It will be able to check this because that error would
have Temporary() == true.

Also clean up some underscore names.

Fixes #442.

R=r
CC=golang-dev, msolo
https://golang.org/cl/957045
This commit is contained in:
Russ Cox 2010-04-26 22:15:25 -07:00
parent cd5191fd30
commit 47a0533411
12 changed files with 347 additions and 315 deletions
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71
src/pkg/net/dnsclient.go
View File

@ -26,6 +26,7 @@ type DNSError struct {
Error string // description of the error
Name string // name looked for
Server string // server used
IsTimeout bool
}
func (e *DNSError) String() string {
@ -37,23 +38,26 @@ func (e *DNSError) String() string {
return s
}
func (e *DNSError) Timeout() bool { return e.IsTimeout }
func (e *DNSError) Temporary() bool { return e.IsTimeout }
const noSuchHost = "no such host"
// Send a request on the connection and hope for a reply.
// Up to cfg.attempts attempts.
func _Exchange(cfg *_DNS_Config, c Conn, name string) (m *_DNS_Msg, err os.Error) {
func exchange(cfg *dnsConfig, c Conn, name string) (*dnsMsg, os.Error) {
if len(name) >= 256 {
return nil, &DNSError{"name too long", name, ""}
return nil, &DNSError{Error: "name too long", Name: name}
}
out := new(_DNS_Msg)
out := new(dnsMsg)
out.id = uint16(rand.Int()) ^ uint16(time.Nanoseconds())
out.question = []_DNS_Question{
_DNS_Question{name, _DNS_TypeA, _DNS_ClassINET},
out.question = []dnsQuestion{
dnsQuestion{name, dnsTypeA, dnsClassINET},
}
out.recursion_desired = true
msg, ok := out.Pack()
if !ok {
return nil, &DNSError{"internal error - cannot pack message", name, ""}
return nil, &DNSError{Error: "internal error - cannot pack message", Name: name}
}
for attempt := 0; attempt < cfg.attempts; attempt++ {
@ -66,15 +70,14 @@ func _Exchange(cfg *_DNS_Config, c Conn, name string) (m *_DNS_Msg, err os.Error
buf := make([]byte, 2000) // More than enough.
n, err = c.Read(buf)
if isEAGAIN(err) {
err = nil
if err != nil {
if e, ok := err.(Error); ok && e.Timeout() {
continue
}
if err != nil {
return nil, err
}
buf = buf[0:n]
in := new(_DNS_Msg)
in := new(dnsMsg)
if !in.Unpack(buf) || in.id != out.id {
continue
}
@ -84,24 +87,24 @@ func _Exchange(cfg *_DNS_Config, c Conn, name string) (m *_DNS_Msg, err os.Error
if a := c.RemoteAddr(); a != nil {
server = a.String()
}
return nil, &DNSError{"no answer from server", name, server}
return nil, &DNSError{Error: "no answer from server", Name: name, Server: server, IsTimeout: true}
}
// Find answer for name in dns message.
// On return, if err == nil, addrs != nil.
func answer(name, server string, dns *_DNS_Msg) (addrs []string, err *DNSError) {
func answer(name, server string, dns *dnsMsg) (addrs []string, err os.Error) {
addrs = make([]string, 0, len(dns.answer))
if dns.rcode == _DNS_RcodeNameError && dns.recursion_available {
return nil, &DNSError{noSuchHost, name, ""}
if dns.rcode == dnsRcodeNameError && dns.recursion_available {
return nil, &DNSError{Error: noSuchHost, Name: name}
}
if dns.rcode != _DNS_RcodeSuccess {
if dns.rcode != dnsRcodeSuccess {
// None of the error codes make sense
// for the query we sent. If we didn't get
// a name error and we didn't get success,
// the server is behaving incorrectly.
return nil, &DNSError{"server misbehaving", name, server}
return nil, &DNSError{Error: "server misbehaving", Name: name, Server: server}
}
// Look for the name.
@ -115,34 +118,34 @@ Cname:
for i := 0; i < len(dns.answer); i++ {
rr := dns.answer[i]
h := rr.Header()
if h.Class == _DNS_ClassINET && h.Name == name {
if h.Class == dnsClassINET && h.Name == name {
switch h.Rrtype {
case _DNS_TypeA:
case dnsTypeA:
n := len(addrs)
a := rr.(*_DNS_RR_A).A
a := rr.(*dnsRR_A).A
addrs = addrs[0 : n+1]
addrs[n] = IPv4(byte(a>>24), byte(a>>16), byte(a>>8), byte(a)).String()
case _DNS_TypeCNAME:
case dnsTypeCNAME:
// redirect to cname
name = rr.(*_DNS_RR_CNAME).Cname
name = rr.(*dnsRR_CNAME).Cname
continue Cname
}
}
}
if len(addrs) == 0 {
return nil, &DNSError{noSuchHost, name, server}
return nil, &DNSError{Error: noSuchHost, Name: name, Server: server}
}
return addrs, nil
}
return nil, &DNSError{"too many redirects", name, server}
return nil, &DNSError{Error: "too many redirects", Name: name, Server: server}
}
// Do a lookup for a single name, which must be rooted
// (otherwise answer will not find the answers).
func tryOneName(cfg *_DNS_Config, name string) (addrs []string, err os.Error) {
func tryOneName(cfg *dnsConfig, name string) (addrs []string, err os.Error) {
if len(cfg.servers) == 0 {
return nil, &DNSError{"no DNS servers", name, ""}
return nil, &DNSError{Error: "no DNS servers", Name: name}
}
for i := 0; i < len(cfg.servers); i++ {
// Calling Dial here is scary -- we have to be sure
@ -157,30 +160,24 @@ func tryOneName(cfg *_DNS_Config, name string) (addrs []string, err os.Error) {
err = cerr
continue
}
msg, merr := _Exchange(cfg, c, name)
msg, merr := exchange(cfg, c, name)
c.Close()
if merr != nil {
err = merr
continue
}
var dnserr *DNSError
addrs, dnserr = answer(name, server, msg)
if dnserr != nil {
err = dnserr
} else {
err = nil // nil os.Error, not nil *DNSError
}
if dnserr == nil || dnserr.Error == noSuchHost {
addrs, err = answer(name, server, msg)
if err == nil || err.(*DNSError).Error == noSuchHost {
break
}
}
return
}
var cfg *_DNS_Config
var cfg *dnsConfig
var dnserr os.Error
func loadConfig() { cfg, dnserr = _DNS_ReadConfig() }
func loadConfig() { cfg, dnserr = dnsReadConfig() }
func isDomainName(s string) bool {
// Requirements on DNS name:
@ -231,7 +228,7 @@ func isDomainName(s string) bool {
// host's addresses.
func LookupHost(name string) (cname string, addrs []string, err os.Error) {
if !isDomainName(name) {
return name, nil, &DNSError{"invalid domain name", name, ""}
return name, nil, &DNSError{Error: "invalid domain name", Name: name}
}
once.Do(loadConfig)
if dnserr != nil || cfg == nil {

22
src/pkg/net/dnsconfig.go
View File

@ -8,7 +8,7 @@ package net
import "os"
type _DNS_Config struct {
type dnsConfig struct {
servers []string // servers to use
search []string // suffixes to append to local name
ndots int // number of dots in name to trigger absolute lookup
@ -17,18 +17,30 @@ type _DNS_Config struct {
rotate bool // round robin among servers
}
var _DNS_configError os.Error
var dnsconfigError os.Error
type DNSConfigError struct {
Error os.Error
}
func (e *DNSConfigError) String() string {
return "error reading DNS config: " + e.Error.String()
}
func (e *DNSConfigError) Timeout() bool { return false }
func (e *DNSConfigError) Temporary() bool { return false }
// See resolv.conf(5) on a Linux machine.
// TODO(rsc): Supposed to call uname() and chop the beginning
// of the host name to get the default search domain.
// We assume it's in resolv.conf anyway.
func _DNS_ReadConfig() (*_DNS_Config, os.Error) {
func dnsReadConfig() (*dnsConfig, os.Error) {
file, err := open("/etc/resolv.conf")
if err != nil {
return nil, err
return nil, &DNSConfigError{err}
}
conf := new(_DNS_Config)
conf := new(dnsConfig)
conf.servers = make([]string, 3)[0:0] // small, but the standard limit
conf.search = make([]string, 0)
conf.ndots = 1

228
src/pkg/net/dnsmsg.go
View File

@ -18,8 +18,8 @@
// A few of the structure elements have string tags to aid the
// generic pack/unpack routines.
//
// TODO(rsc) There are enough names defined in this file that they're all
// prefixed with _DNS_. Perhaps put this in its own package later.
// TODO(rsc): There are enough names defined in this file that they're all
// prefixed with dns. Perhaps put this in its own package later.
package net
@ -33,55 +33,55 @@ import (
// Wire constants.
const (
// valid _DNS_RR_Header.Rrtype and _DNS_Question.qtype
_DNS_TypeA = 1
_DNS_TypeNS = 2
_DNS_TypeMD = 3
_DNS_TypeMF = 4
_DNS_TypeCNAME = 5
_DNS_TypeSOA = 6
_DNS_TypeMB = 7
_DNS_TypeMG = 8
_DNS_TypeMR = 9
_DNS_TypeNULL = 10
_DNS_TypeWKS = 11
_DNS_TypePTR = 12
_DNS_TypeHINFO = 13
_DNS_TypeMINFO = 14
_DNS_TypeMX = 15
_DNS_TypeTXT = 16
// valid dnsRR_Header.Rrtype and dnsQuestion.qtype
dnsTypeA = 1
dnsTypeNS = 2
dnsTypeMD = 3
dnsTypeMF = 4
dnsTypeCNAME = 5
dnsTypeSOA = 6
dnsTypeMB = 7
dnsTypeMG = 8
dnsTypeMR = 9
dnsTypeNULL = 10
dnsTypeWKS = 11
dnsTypePTR = 12
dnsTypeHINFO = 13
dnsTypeMINFO = 14
dnsTypeMX = 15
dnsTypeTXT = 16
// valid _DNS_Question.qtype only
_DNS_TypeAXFR = 252
_DNS_TypeMAILB = 253
_DNS_TypeMAILA = 254
_DNS_TypeALL = 255
// valid dnsQuestion.qtype only
dnsTypeAXFR = 252
dnsTypeMAILB = 253
dnsTypeMAILA = 254
dnsTypeALL = 255
// valid _DNS_Question.qclass
_DNS_ClassINET = 1
_DNS_ClassCSNET = 2
_DNS_ClassCHAOS = 3
_DNS_ClassHESIOD = 4
_DNS_ClassANY = 255
// valid dnsQuestion.qclass
dnsClassINET = 1
dnsClassCSNET = 2
dnsClassCHAOS = 3
dnsClassHESIOD = 4
dnsClassANY = 255
// _DNS_Msg.rcode
_DNS_RcodeSuccess = 0
_DNS_RcodeFormatError = 1
_DNS_RcodeServerFailure = 2
_DNS_RcodeNameError = 3
_DNS_RcodeNotImplemented = 4
_DNS_RcodeRefused = 5
// dnsMsg.rcode
dnsRcodeSuccess = 0
dnsRcodeFormatError = 1
dnsRcodeServerFailure = 2
dnsRcodeNameError = 3
dnsRcodeNotImplemented = 4
dnsRcodeRefused = 5
)
// The wire format for the DNS packet header.
type __DNS_Header struct {
type dnsHeader struct {
Id uint16
Bits uint16
Qdcount, Ancount, Nscount, Arcount uint16
}
const (
// __DNS_Header.Bits
// dnsHeader.Bits
_QR = 1 << 15 // query/response (response=1)
_AA = 1 << 10 // authoritative
_TC = 1 << 9 // truncated
@ -90,7 +90,7 @@ const (
)
// DNS queries.
type _DNS_Question struct {
type dnsQuestion struct {
Name string "domain-name" // "domain-name" specifies encoding; see packers below
Qtype uint16
Qclass uint16
@ -99,7 +99,7 @@ type _DNS_Question struct {
// DNS responses (resource records).
// There are many types of messages,
// but they all share the same header.
type _DNS_RR_Header struct {
type dnsRR_Header struct {
Name string "domain-name"
Rrtype uint16
Class uint16
@ -107,103 +107,103 @@ type _DNS_RR_Header struct {
Rdlength uint16 // length of data after header
}
func (h *_DNS_RR_Header) Header() *_DNS_RR_Header {
func (h *dnsRR_Header) Header() *dnsRR_Header {
return h
}
type _DNS_RR interface {
Header() *_DNS_RR_Header
type dnsRR interface {
Header() *dnsRR_Header
}
// Specific DNS RR formats for each query type.
type _DNS_RR_CNAME struct {
Hdr _DNS_RR_Header
type dnsRR_CNAME struct {
Hdr dnsRR_Header
Cname string "domain-name"
}
func (rr *_DNS_RR_CNAME) Header() *_DNS_RR_Header {
func (rr *dnsRR_CNAME) Header() *dnsRR_Header {
return &rr.Hdr
}
type _DNS_RR_HINFO struct {
Hdr _DNS_RR_Header
type dnsRR_HINFO struct {
Hdr dnsRR_Header
Cpu string
Os string
}
func (rr *_DNS_RR_HINFO) Header() *_DNS_RR_Header {
func (rr *dnsRR_HINFO) Header() *dnsRR_Header {
return &rr.Hdr
}
type _DNS_RR_MB struct {
Hdr _DNS_RR_Header
type dnsRR_MB struct {
Hdr dnsRR_Header
Mb string "domain-name"
}
func (rr *_DNS_RR_MB) Header() *_DNS_RR_Header {
func (rr *dnsRR_MB) Header() *dnsRR_Header {
return &rr.Hdr
}
type _DNS_RR_MG struct {
Hdr _DNS_RR_Header
type dnsRR_MG struct {
Hdr dnsRR_Header
Mg string "domain-name"
}
func (rr *_DNS_RR_MG) Header() *_DNS_RR_Header {
func (rr *dnsRR_MG) Header() *dnsRR_Header {
return &rr.Hdr
}
type _DNS_RR_MINFO struct {
Hdr _DNS_RR_Header
type dnsRR_MINFO struct {
Hdr dnsRR_Header
Rmail string "domain-name"
Email string "domain-name"
}
func (rr *_DNS_RR_MINFO) Header() *_DNS_RR_Header {
func (rr *dnsRR_MINFO) Header() *dnsRR_Header {
return &rr.Hdr
}
type _DNS_RR_MR struct {
Hdr _DNS_RR_Header
type dnsRR_MR struct {
Hdr dnsRR_Header
Mr string "domain-name"
}
func (rr *_DNS_RR_MR) Header() *_DNS_RR_Header {
func (rr *dnsRR_MR) Header() *dnsRR_Header {
return &rr.Hdr
}
type _DNS_RR_MX struct {
Hdr _DNS_RR_Header
type dnsRR_MX struct {
Hdr dnsRR_Header
Pref uint16
Mx string "domain-name"
}
func (rr *_DNS_RR_MX) Header() *_DNS_RR_Header {
func (rr *dnsRR_MX) Header() *dnsRR_Header {
return &rr.Hdr
}
type _DNS_RR_NS struct {
Hdr _DNS_RR_Header
type dnsRR_NS struct {
Hdr dnsRR_Header
Ns string "domain-name"
}
func (rr *_DNS_RR_NS) Header() *_DNS_RR_Header {
func (rr *dnsRR_NS) Header() *dnsRR_Header {
return &rr.Hdr
}
type _DNS_RR_PTR struct {
Hdr _DNS_RR_Header
type dnsRR_PTR struct {
Hdr dnsRR_Header
Ptr string "domain-name"
}
func (rr *_DNS_RR_PTR) Header() *_DNS_RR_Header {
func (rr *dnsRR_PTR) Header() *dnsRR_Header {
return &rr.Hdr
}
type _DNS_RR_SOA struct {
Hdr _DNS_RR_Header
type dnsRR_SOA struct {
Hdr dnsRR_Header
Ns string "domain-name"
Mbox string "domain-name"
Serial uint32
@ -213,25 +213,25 @@ type _DNS_RR_SOA struct {
Minttl uint32
}
func (rr *_DNS_RR_SOA) Header() *_DNS_RR_Header {
func (rr *dnsRR_SOA) Header() *dnsRR_Header {
return &rr.Hdr
}
type _DNS_RR_TXT struct {
Hdr _DNS_RR_Header
type dnsRR_TXT struct {
Hdr dnsRR_Header
Txt string // not domain name
}
func (rr *_DNS_RR_TXT) Header() *_DNS_RR_Header {
func (rr *dnsRR_TXT) Header() *dnsRR_Header {
return &rr.Hdr
}
type _DNS_RR_A struct {
Hdr _DNS_RR_Header
type dnsRR_A struct {
Hdr dnsRR_Header
A uint32 "ipv4"
}
func (rr *_DNS_RR_A) Header() *_DNS_RR_Header { return &rr.Hdr }
func (rr *dnsRR_A) Header() *dnsRR_Header { return &rr.Hdr }
// Packing and unpacking.
@ -243,19 +243,19 @@ func (rr *_DNS_RR_A) Header() *_DNS_RR_Header { return &rr.Hdr }
// packing sequence.
// Map of constructors for each RR wire type.
var rr_mk = map[int]func() _DNS_RR{
_DNS_TypeCNAME: func() _DNS_RR { return new(_DNS_RR_CNAME) },
_DNS_TypeHINFO: func() _DNS_RR { return new(_DNS_RR_HINFO) },
_DNS_TypeMB: func() _DNS_RR { return new(_DNS_RR_MB) },
_DNS_TypeMG: func() _DNS_RR { return new(_DNS_RR_MG) },
_DNS_TypeMINFO: func() _DNS_RR { return new(_DNS_RR_MINFO) },
_DNS_TypeMR: func() _DNS_RR { return new(_DNS_RR_MR) },
_DNS_TypeMX: func() _DNS_RR { return new(_DNS_RR_MX) },
_DNS_TypeNS: func() _DNS_RR { return new(_DNS_RR_NS) },
_DNS_TypePTR: func() _DNS_RR { return new(_DNS_RR_PTR) },
_DNS_TypeSOA: func() _DNS_RR { return new(_DNS_RR_SOA) },
_DNS_TypeTXT: func() _DNS_RR { return new(_DNS_RR_TXT) },
_DNS_TypeA: func() _DNS_RR { return new(_DNS_RR_A) },
var rr_mk = map[int]func() dnsRR{
dnsTypeCNAME: func() dnsRR { return new(dnsRR_CNAME) },
dnsTypeHINFO: func() dnsRR { return new(dnsRR_HINFO) },
dnsTypeMB: func() dnsRR { return new(dnsRR_MB) },
dnsTypeMG: func() dnsRR { return new(dnsRR_MG) },
dnsTypeMINFO: func() dnsRR { return new(dnsRR_MINFO) },
dnsTypeMR: func() dnsRR { return new(dnsRR_MR) },
dnsTypeMX: func() dnsRR { return new(dnsRR_MX) },
dnsTypeNS: func() dnsRR { return new(dnsRR_NS) },
dnsTypePTR: func() dnsRR { return new(dnsRR_PTR) },
dnsTypeSOA: func() dnsRR { return new(dnsRR_SOA) },
dnsTypeTXT: func() dnsRR { return new(dnsRR_TXT) },
dnsTypeA: func() dnsRR { return new(dnsRR_A) },
}
// Pack a domain name s into msg[off:].
@ -522,7 +522,7 @@ func printStructValue(val *reflect.StructValue) string {
func printStruct(any interface{}) string { return printStructValue(structValue(any)) }
// Resource record packer.
func packRR(rr _DNS_RR, msg []byte, off int) (off2 int, ok bool) {
func packRR(rr dnsRR, msg []byte, off int) (off2 int, ok bool) {
var off1 int
// pack twice, once to find end of header
// and again to find end of packet.
@ -541,9 +541,9 @@ func packRR(rr _DNS_RR, msg []byte, off int) (off2 int, ok bool) {
}
// Resource record unpacker.
func unpackRR(msg []byte, off int) (rr _DNS_RR, off1 int, ok bool) {
func unpackRR(msg []byte, off int) (rr dnsRR, off1 int, ok bool) {
// unpack just the header, to find the rr type and length
var h _DNS_RR_Header
var h dnsRR_Header
off0 := off
if off, ok = unpackStruct(&h, msg, off); !ok {
return nil, len(msg), false
@ -568,7 +568,7 @@ func unpackRR(msg []byte, off int) (rr _DNS_RR, off1 int, ok bool) {
// A manually-unpacked version of (id, bits).
// This is in its own struct for easy printing.
type __DNS_Msg_Top struct {
type dnsMsgHdr struct {
id uint16
response bool
opcode int
@ -579,19 +579,19 @@ type __DNS_Msg_Top struct {
rcode int
}
type _DNS_Msg struct {
__DNS_Msg_Top
question []_DNS_Question
answer []_DNS_RR
ns []_DNS_RR
extra []_DNS_RR
type dnsMsg struct {
dnsMsgHdr
question []dnsQuestion
answer []dnsRR
ns []dnsRR
extra []dnsRR
}
func (dns *_DNS_Msg) Pack() (msg []byte, ok bool) {
var dh __DNS_Header
func (dns *dnsMsg) Pack() (msg []byte, ok bool) {
var dh dnsHeader
// Convert convenient _DNS_Msg into wire-like __DNS_Header.
// Convert convenient dnsMsg into wire-like dnsHeader.
dh.Id = dns.id
dh.Bits = uint16(dns.opcode)<<11 | uint16(dns.rcode)
if dns.recursion_available {
@ -647,9 +647,9 @@ func (dns *_DNS_Msg) Pack() (msg []byte, ok bool) {
return msg[0:off], true
}
func (dns *_DNS_Msg) Unpack(msg []byte) bool {
func (dns *dnsMsg) Unpack(msg []byte) bool {
// Header.
var dh __DNS_Header
var dh dnsHeader
off := 0
var ok bool
if off, ok = unpackStruct(&dh, msg, off); !ok {
@ -665,10 +665,10 @@ func (dns *_DNS_Msg) Unpack(msg []byte) bool {
dns.rcode = int(dh.Bits & 0xF)
// Arrays.
dns.question = make([]_DNS_Question, dh.Qdcount)
dns.answer = make([]_DNS_RR, dh.Ancount)
dns.ns = make([]_DNS_RR, dh.Nscount)
dns.extra = make([]_DNS_RR, dh.Arcount)
dns.question = make([]dnsQuestion, dh.Qdcount)
dns.answer = make([]dnsRR, dh.Ancount)
dns.ns = make([]dnsRR, dh.Nscount)
dns.extra = make([]dnsRR, dh.Arcount)
for i := 0; i < len(dns.question); i++ {
off, ok = unpackStruct(&dns.question[i], msg, off)
@ -691,8 +691,8 @@ func (dns *_DNS_Msg) Unpack(msg []byte) bool {
return true
}
func (dns *_DNS_Msg) String() string {
s := "DNS: " + printStruct(&dns.__DNS_Msg_Top) + "\n"
func (dns *dnsMsg) String() string {
s := "DNS: " + printStruct(&dns.dnsMsgHdr) + "\n"
if len(dns.question) > 0 {
s += "-- Questions\n"
for i := 0; i < len(dns.question); i++ {

66
src/pkg/net/fd.go
View File

@ -7,6 +7,7 @@
package net
import (
"io"
"once"
"os"
"sync"
@ -44,6 +45,12 @@ type netFD struct {
ncr, ncw int
}
type InvalidConnError struct{}
func (e *InvalidConnError) String() string { return "invalid net.Conn" }
func (e *InvalidConnError) Temporary() bool { return false }
func (e *InvalidConnError) Timeout() bool { return false }
// A pollServer helps FDs determine when to retry a non-blocking
// read or write after they get EAGAIN. When an FD needs to wait,
// send the fd on s.cr (for a read) or s.cw (for a write) to pass the
@ -342,13 +349,6 @@ func (fd *netFD) decref() {
fd.sysmu.Unlock()
}
func isEAGAIN(e os.Error) bool {
if e1, ok := e.(*os.PathError); ok {
return e1.Error == os.EAGAIN
}
return e == os.EAGAIN
}
func (fd *netFD) Close() os.Error {
if fd == nil || fd.sysfile == nil {
return os.EINVAL
@ -374,17 +374,24 @@ func (fd *netFD) Read(p []byte) (n int, err os.Error) {
} else {
fd.rdeadline = 0
}
var oserr os.Error
for {
n, err = fd.sysfile.Read(p)
if isEAGAIN(err) && fd.rdeadline >= 0 {
var errno int
n, errno = syscall.Read(fd.sysfile.Fd(), p)
if errno == syscall.EAGAIN && fd.rdeadline >= 0 {
pollserver.WaitRead(fd)
continue
}
if errno != 0 {
n = 0
oserr = os.Errno(errno)
} else if n == 0 && errno == 0 && fd.proto != syscall.SOCK_DGRAM {
err = os.EOF
}
break
}
if fd.proto == syscall.SOCK_DGRAM && err == os.EOF {
// 0 in datagram protocol just means 0-length packet
err = nil
if oserr != nil {
err = &OpError{"read", fd.net, fd.raddr, oserr}
}
return
}
@ -402,6 +409,7 @@ func (fd *netFD) ReadFrom(p []byte) (n int, sa syscall.Sockaddr, err os.Error) {
} else {
fd.rdeadline = 0
}
var oserr os.Error
for {
var errno int
n, sa, errno = syscall.Recvfrom(fd.sysfd, p, 0)
@ -411,10 +419,13 @@ func (fd *netFD) ReadFrom(p []byte) (n int, sa syscall.Sockaddr, err os.Error) {
}
if errno != 0 {
n = 0
err = &os.PathError{"recvfrom", fd.sysfile.Name(), os.Errno(errno)}
oserr = os.Errno(errno)
}
break
}
if oserr != nil {
err = &OpError{"read", fd.net, fd.laddr, oserr}
}
return
}
@ -431,25 +442,32 @@ func (fd *netFD) Write(p []byte) (n int, err os.Error) {
} else {
fd.wdeadline = 0
}
err = nil
nn := 0
first := true // force at least one Write, to send 0-length datagram packets
for nn < len(p) || first {
first = false
n, err = fd.sysfile.Write(p[nn:])
var oserr os.Error
for {
n, errno := syscall.Write(fd.sysfile.Fd(), p[nn:])
if n > 0 {
nn += n
}
if nn == len(p) {
break
}
if isEAGAIN(err) && fd.wdeadline >= 0 {
if errno == syscall.EAGAIN && fd.wdeadline >= 0 {
pollserver.WaitWrite(fd)
continue
}
if n == 0 || err != nil {
if errno != 0 {
n = 0
oserr = os.Errno(errno)
break
}
if n == 0 {
oserr = io.ErrUnexpectedEOF
break
}
}
if oserr != nil {
err = &OpError{"write", fd.net, fd.raddr, oserr}
}
return nn, err
}
@ -467,7 +485,7 @@ func (fd *netFD) WriteTo(p []byte, sa syscall.Sockaddr) (n int, err os.Error) {
} else {
fd.wdeadline = 0
}
err = nil
var oserr os.Error
for {
errno := syscall.Sendto(fd.sysfd, p, 0, sa)
if errno == syscall.EAGAIN && fd.wdeadline >= 0 {
@ -475,12 +493,14 @@ func (fd *netFD) WriteTo(p []byte, sa syscall.Sockaddr) (n int, err os.Error) {
continue
}
if errno != 0 {
err = &os.PathError{"sendto", fd.sysfile.Name(), os.Errno(errno)}
oserr = os.Errno(errno)
}
break
}
if err == nil {
if oserr == nil {
n = len(p)
} else {
err = &OpError{"write", fd.net, fd.raddr, oserr}
}
return
}

22
src/pkg/net/ipsock.go
View File

@ -49,6 +49,7 @@ type sockaddr interface {
func internetSocket(net string, laddr, raddr sockaddr, proto int, mode string, toAddr func(syscall.Sockaddr) Addr) (fd *netFD, err os.Error) {
// Figure out IP version.
// If network has a suffix like "tcp4", obey it.
var oserr os.Error
family := syscall.AF_INET6
switch net[len(net)-1] {
case '4':
@ -67,16 +68,16 @@ func internetSocket(net string, laddr, raddr sockaddr, proto int, mode string, t
var la, ra syscall.Sockaddr
if laddr != nil {
if la, err = laddr.sockaddr(family); err != nil {
if la, oserr = laddr.sockaddr(family); err != nil {
goto Error
}
}
if raddr != nil {
if ra, err = raddr.sockaddr(family); err != nil {
if ra, oserr = raddr.sockaddr(family); err != nil {
goto Error
}
}
fd, err = socket(net, family, proto, 0, la, ra, toAddr)
fd, oserr = socket(net, family, proto, 0, la, ra, toAddr)
if err != nil {
goto Error
}
@ -87,7 +88,7 @@ Error:
if mode == "listen" {
addr = laddr
}
return nil, &OpError{mode, net, addr, err}
return nil, &OpError{mode, net, addr, oserr}
}
func getip(fd int, remote bool) (ip []byte, port int, ok bool) {
@ -109,6 +110,13 @@ func getip(fd int, remote bool) (ip []byte, port int, ok bool) {
return
}
type InvalidAddrError string
func (e InvalidAddrError) String() string { return string(e) }
func (e InvalidAddrError) Timeout() bool { return false }
func (e InvalidAddrError) Temporary() bool { return false }
func ipToSockaddr(family int, ip IP, port int) (syscall.Sockaddr, os.Error) {
switch family {
case syscall.AF_INET:
@ -116,7 +124,7 @@ func ipToSockaddr(family int, ip IP, port int) (syscall.Sockaddr, os.Error) {
ip = IPv4zero
}
if ip = ip.To4(); ip == nil {
return nil, os.EINVAL
return nil, InvalidAddrError("non-IPv4 address")
}
s := new(syscall.SockaddrInet4)
for i := 0; i < IPv4len; i++ {
@ -135,7 +143,7 @@ func ipToSockaddr(family int, ip IP, port int) (syscall.Sockaddr, os.Error) {
ip = IPzero
}
if ip = ip.To16(); ip == nil {
return nil, os.EINVAL
return nil, InvalidAddrError("non-IPv6 address")
}
s := new(syscall.SockaddrInet6)
for i := 0; i < IPv6len; i++ {
@ -144,7 +152,7 @@ func ipToSockaddr(family int, ip IP, port int) (syscall.Sockaddr, os.Error) {
s.Port = port
return s, nil
}
return nil, os.EINVAL
return nil, InvalidAddrError("unexpected socket family")
}
// Split "host:port" into "host" and "port".

70
src/pkg/net/net.go
View File

@ -22,16 +22,17 @@ type Addr interface {
// Conn is a generic stream-oriented network connection.
type Conn interface {
// Read reads data from the connection.
// Read can be made to time out and return err == os.EAGAIN
// Read can be made to time out and return a net.Error with Timeout() == true
// after a fixed time limit; see SetTimeout and SetReadTimeout.
Read(b []byte) (n int, err os.Error)
// Write writes data to the connection.
// Write can be made to time out and return err == os.EAGAIN
// after a fixed time limit; see SetTimeout and SetReadTimeout.
// Write can be made to time out and return a net.Error with Timeout() == true
// after a fixed time limit; see SetTimeout and SetWriteTimeout.
Write(b []byte) (n int, err os.Error)
// Close closes the connection.
// The error returned is an os.Error to satisfy io.Closer;
Close() os.Error
// LocalAddr returns the local network address.
@ -45,35 +46,45 @@ type Conn interface {
SetTimeout(nsec int64) os.Error
// SetReadTimeout sets the time (in nanoseconds) that
// Read will wait for data before returning os.EAGAIN.
// Read will wait for data before returning an error with Timeout() == true.
// Setting nsec == 0 (the default) disables the deadline.
SetReadTimeout(nsec int64) os.Error
// SetWriteTimeout sets the time (in nanoseconds) that
// Write will wait to send its data before returning os.EAGAIN.
// Write will wait to send its data before returning an error with Timeout() == true.
// Setting nsec == 0 (the default) disables the deadline.
// Even if write times out, it may return n > 0, indicating that
// some of the data was successfully written.
SetWriteTimeout(nsec int64) os.Error
}
// An Error represents a network error.
type Error interface {
os.Error
Timeout() bool // Is the error a timeout?
Temporary() bool // Is the error temporary?
}
// PacketConn is a generic packet-oriented network connection.
type PacketConn interface {
// ReadFrom reads a packet from the connection,
// copying the payload into b. It returns the number of
// bytes copied into b and the return address that
// was on the packet.
// ReadFrom can be made to time out and return err == os.EAGAIN
// after a fixed time limit; see SetTimeout and SetReadTimeout.
// ReadFrom can be made to time out and return
// an error with Timeout() == true after a fixed time limit;
// see SetTimeout and SetReadTimeout.
ReadFrom(b []byte) (n int, addr Addr, err os.Error)
// WriteTo writes a packet with payload b to addr.
// WriteTo can be made to time out and return err == os.EAGAIN
// after a fixed time limit; see SetTimeout and SetWriteTimeout.
// WriteTo can be made to time out and return
// an error with Timeout() == true after a fixed time limit;
// see SetTimeout and SetWriteTimeout.
// On packet-oriented connections, write timeouts are rare.
WriteTo(b []byte, addr Addr) (n int, err os.Error)
// Close closes the connection.
// The error returned is an os.Error to satisfy io.Closer;
Close() os.Error
// LocalAddr returns the local network address.
@ -84,12 +95,12 @@ type PacketConn interface {
SetTimeout(nsec int64) os.Error
// SetReadTimeout sets the time (in nanoseconds) that
// Read will wait for data before returning os.EAGAIN.
// Read will wait for data before returning an error with Timeout() == true.
// Setting nsec == 0 (the default) disables the deadline.
SetReadTimeout(nsec int64) os.Error
// SetWriteTimeout sets the time (in nanoseconds) that
// Write will wait to send its data before returning os.EAGAIN.
// Write will wait to send its data before returning an error with Timeout() == true.
// Setting nsec == 0 (the default) disables the deadline.
// Even if write times out, it may return n > 0, indicating that
// some of the data was successfully written.
@ -97,11 +108,16 @@ type PacketConn interface {
}
// A Listener is a generic network listener for stream-oriented protocols.
// Accept waits for the next connection and Close closes the connection.
type Listener interface {
// Accept waits for and returns the next connection to the listener.
Accept() (c Conn, err os.Error)
// Close closes the listener.
// The error returned is an os.Error to satisfy io.Closer;
Close() os.Error
Addr() Addr // Listener's network address
// Addr returns the listener's network address.
Addr() Addr
}
// Dial connects to the remote address raddr on the network net.
@ -266,6 +282,24 @@ func (e *OpError) String() string {
return s
}
type temporary interface {
Temporary() bool
}
func (e *OpError) Temporary() bool {
t, ok := e.Error.(temporary)
return ok && t.Temporary()
}
type timeout interface {
Timeout() bool
}
func (e *OpError) Timeout() bool {
t, ok := e.Error.(timeout)
return ok && t.Timeout()
}
type AddrError struct {
Error string
Addr string
@ -279,6 +313,16 @@ func (e *AddrError) String() string {
return s
}
func (e *AddrError) Temporary() bool {
return false
}
func (e *AddrError) Timeout() bool {
return false
}
type UnknownNetworkError string
func (e UnknownNetworkError) String() string { return "unknown network " + string(e) }
func (e UnknownNetworkError) Temporary() bool { return false }
func (e UnknownNetworkError) Timeout() bool { return false }

12
src/pkg/net/server_test.go
View File

@ -69,14 +69,14 @@ func connect(t *testing.T, network, addr string, isEmpty bool) {
}
var b1 [100]byte
n, err := fd.Write(b)
n, err1 := fd.Write(b)
if n != len(b) {
t.Fatalf("fd.Write(%q) = %d, %v", b, n, err)
t.Fatalf("fd.Write(%q) = %d, %v", b, n, err1)
}
n, err = fd.Read(&b1)
if n != len(b) || err != nil {
t.Fatalf("fd.Read() = %d, %v (want %d, nil)", n, err, len(b))
n, err1 = fd.Read(&b1)
if n != len(b) || err1 != nil {
t.Fatalf("fd.Read() = %d, %v (want %d, nil)", n, err1, len(b))
}
fd.Close()
}
@ -127,7 +127,7 @@ func runPacket(t *testing.T, network, addr string, listening chan<- string, done
var buf [1000]byte
for {
n, addr, err := c.ReadFrom(&buf)
if isEAGAIN(err) {
if e, ok := err.(Error); ok && e.Timeout() {
if done <- 1 {
break
}

23
src/pkg/net/tcpsock.go
View File

@ -81,10 +81,7 @@ func (c *TCPConn) ok() bool { return c != nil && c.fd != nil }
// Implementation of the Conn interface - see Conn for documentation.
// Read reads data from the TCP connection.
//
// Read can be made to time out and return err == os.EAGAIN
// after a fixed time limit; see SetTimeout and SetReadTimeout.
// Read implements the net.Conn Read method.
func (c *TCPConn) Read(b []byte) (n int, err os.Error) {
if !c.ok() {
return 0, os.EINVAL
@ -92,10 +89,7 @@ func (c *TCPConn) Read(b []byte) (n int, err os.Error) {
return c.fd.Read(b)
}
// Write writes data to the TCP connection.
//
// Write can be made to time out and return err == os.EAGAIN
// after a fixed time limit; see SetTimeout and SetReadTimeout.
// Write implements the net.Conn Write method.
func (c *TCPConn) Write(b []byte) (n int, err os.Error) {
if !c.ok() {
return 0, os.EINVAL
@ -129,8 +123,7 @@ func (c *TCPConn) RemoteAddr() Addr {
return c.fd.raddr
}
// SetTimeout sets the read and write deadlines associated
// with the connection.
// SetTimeout implements the net.Conn SetTimeout method.
func (c *TCPConn) SetTimeout(nsec int64) os.Error {
if !c.ok() {
return os.EINVAL
@ -138,9 +131,7 @@ func (c *TCPConn) SetTimeout(nsec int64) os.Error {
return setTimeout(c.fd, nsec)
}
// SetReadTimeout sets the time (in nanoseconds) that
// Read will wait for data before returning os.EAGAIN.
// Setting nsec == 0 (the default) disables the deadline.
// SetReadTimeout implements the net.Conn SetReadTimeout method.
func (c *TCPConn) SetReadTimeout(nsec int64) os.Error {
if !c.ok() {
return os.EINVAL
@ -148,11 +139,7 @@ func (c *TCPConn) SetReadTimeout(nsec int64) os.Error {
return setReadTimeout(c.fd, nsec)
}
// SetWriteTimeout sets the time (in nanoseconds) that
// Write will wait to send its data before returning os.EAGAIN.
// Setting nsec == 0 (the default) disables the deadline.
// Even if write times out, it may return n > 0, indicating that
// some of the data was successfully written.
// SetWriteTimeout implements the net.Conn SetWriteTimeout method.
func (c *TCPConn) SetWriteTimeout(nsec int64) os.Error {
if !c.ok() {
return os.EINVAL

4
src/pkg/net/timeout_test.go
View File

@ -32,8 +32,8 @@ func testTimeout(t *testing.T, network, addr string, readFrom bool) {
if readFrom {
what = "ReadFrom"
}
if n != 0 || !isEAGAIN(err1) {
t.Errorf("fd.%s on %s %s did not return 0, EAGAIN: %v, %v", what, network, addr, n, err1)
if n != 0 || err1 == nil || !err1.(Error).Timeout() {
t.Errorf("fd.%s on %s %s did not return 0, timeout: %v, %v", what, network, addr, n, err1)
}
if t1-t0 < 0.5e8 || t1-t0 > 1.5e8 {
t.Errorf("fd.%s on %s %s took %f seconds, expected 0.1", what, network, addr, float64(t1-t0)/1e9)

53
src/pkg/net/udpsock.go
View File

@ -77,12 +77,7 @@ func (c *UDPConn) ok() bool { return c != nil && c.fd != nil }
// Implementation of the Conn interface - see Conn for documentation.
// Read reads data from a single UDP packet on the connection.
// If the slice b is smaller than the arriving packet,
// the excess packet data may be discarded.
//
// Read can be made to time out and return err == os.EAGAIN
// after a fixed time limit; see SetTimeout and SetReadTimeout.
// Read implements the net.Conn Read method.
func (c *UDPConn) Read(b []byte) (n int, err os.Error) {
if !c.ok() {
return 0, os.EINVAL
@ -90,10 +85,7 @@ func (c *UDPConn) Read(b []byte) (n int, err os.Error) {
return c.fd.Read(b)
}
// Write writes data to the connection as a single UDP packet.
//
// Write can be made to time out and return err == os.EAGAIN
// after a fixed time limit; see SetTimeout and SetReadTimeout.
// Write implements the net.Conn Write method.
func (c *UDPConn) Write(b []byte) (n int, err os.Error) {
if !c.ok() {
return 0, os.EINVAL
@ -127,8 +119,7 @@ func (c *UDPConn) RemoteAddr() Addr {
return c.fd.raddr
}
// SetTimeout sets the read and write deadlines associated
// with the connection.
// SetTimeout implements the net.Conn SetTimeout method.
func (c *UDPConn) SetTimeout(nsec int64) os.Error {
if !c.ok() {
return os.EINVAL
@ -136,9 +127,7 @@ func (c *UDPConn) SetTimeout(nsec int64) os.Error {
return setTimeout(c.fd, nsec)
}
// SetReadTimeout sets the time (in nanoseconds) that
// Read will wait for data before returning os.EAGAIN.
// Setting nsec == 0 (the default) disables the deadline.
// SetReadTimeout implements the net.Conn SetReadTimeout method.
func (c *UDPConn) SetReadTimeout(nsec int64) os.Error {
if !c.ok() {
return os.EINVAL
@ -146,11 +135,7 @@ func (c *UDPConn) SetReadTimeout(nsec int64) os.Error {
return setReadTimeout(c.fd, nsec)
}
// SetWriteTimeout sets the time (in nanoseconds) that
// Write will wait to send its data before returning os.EAGAIN.
// Setting nsec == 0 (the default) disables the deadline.
// Even if write times out, it may return n > 0, indicating that
// some of the data was successfully written.
// SetWriteTimeout implements the net.Conn SetWriteTimeout method.
func (c *UDPConn) SetWriteTimeout(nsec int64) os.Error {
if !c.ok() {
return os.EINVAL
@ -182,7 +167,7 @@ func (c *UDPConn) SetWriteBuffer(bytes int) os.Error {
// It returns the number of bytes copied into b and the return address
// that was on the packet.
//
// ReadFromUDP can be made to time out and return err == os.EAGAIN
// ReadFromUDP can be made to time out and return an error with Timeout() == true
// after a fixed time limit; see SetTimeout and SetReadTimeout.
func (c *UDPConn) ReadFromUDP(b []byte) (n int, addr *UDPAddr, err os.Error) {
if !c.ok() {
@ -198,12 +183,7 @@ func (c *UDPConn) ReadFromUDP(b []byte) (n int, addr *UDPAddr, err os.Error) {
return
}
// ReadFrom reads a UDP packet from c, copying the payload into b.
// It returns the number of bytes copied into b and the return address
// that was on the packet.
//
// ReadFrom can be made to time out and return err == os.EAGAIN
// after a fixed time limit; see SetTimeout and SetReadTimeout.
// ReadFrom implements the net.PacketConn ReadFrom method.
func (c *UDPConn) ReadFrom(b []byte) (n int, addr Addr, err os.Error) {
if !c.ok() {
return 0, nil, os.EINVAL
@ -214,25 +194,22 @@ func (c *UDPConn) ReadFrom(b []byte) (n int, addr Addr, err os.Error) {
// WriteToUDP writes a UDP packet to addr via c, copying the payload from b.
//
// WriteToUDP can be made to time out and return err == os.EAGAIN
// after a fixed time limit; see SetTimeout and SetWriteTimeout.
// On packet-oriented connections such as UDP, write timeouts are rare.
// WriteToUDP can be made to time out and return
// an error with Timeout() == true after a fixed time limit;
// see SetTimeout and SetWriteTimeout.
// On packet-oriented connections, write timeouts are rare.
func (c *UDPConn) WriteToUDP(b []byte, addr *UDPAddr) (n int, err os.Error) {
if !c.ok() {
return 0, os.EINVAL
}
sa, err := addr.sockaddr(c.fd.family)
if err != nil {
return 0, err
sa, err1 := addr.sockaddr(c.fd.family)
if err1 != nil {
return 0, &OpError{Op: "write", Net: "udp", Addr: addr, Error: err1}
}
return c.fd.WriteTo(b, sa)
}
// WriteTo writes a UDP packet with payload b to addr via c.
//
// WriteTo can be made to time out and return err == os.EAGAIN
// after a fixed time limit; see SetTimeout and SetWriteTimeout.
// On packet-oriented connections such as UDP, write timeouts are rare.
// WriteTo implements the net.PacketConn WriteTo method.
func (c *UDPConn) WriteTo(b []byte, addr Addr) (n int, err os.Error) {
if !c.ok() {
return 0, os.EINVAL

69
src/pkg/net/unixsock.go
View File

@ -34,7 +34,7 @@ func unixSocket(net string, laddr, raddr *UnixAddr, mode string) (fd *netFD, err
if raddr != nil {
ra = &syscall.SockaddrUnix{Name: raddr.Name}
} else if proto != syscall.SOCK_DGRAM || laddr == nil {
return nil, &OpError{mode, net, nil, errMissingAddress}
return nil, &OpError{Op: mode, Net: net, Error: errMissingAddress}
}
case "listen":
@ -43,7 +43,7 @@ func unixSocket(net string, laddr, raddr *UnixAddr, mode string) (fd *netFD, err
}
la = &syscall.SockaddrUnix{Name: laddr.Name}
if raddr != nil {
return nil, &OpError{mode, net, raddr, &AddrError{"unexpected remote address", raddr.String()}}
return nil, &OpError{Op: mode, Net: net, Addr: raddr, Error: &AddrError{Error: "unexpected remote address", Addr: raddr.String()}}
}
}
@ -51,8 +51,8 @@ func unixSocket(net string, laddr, raddr *UnixAddr, mode string) (fd *netFD, err
if proto != syscall.SOCK_STREAM {
f = sockaddrToUnixgram
}
fd, err = socket(net, syscall.AF_UNIX, proto, 0, la, ra, f)
if err != nil {
fd, oserr := socket(net, syscall.AF_UNIX, proto, 0, la, ra, f)
if oserr != nil {
goto Error
}
return fd, nil
@ -62,7 +62,7 @@ Error:
if mode == "listen" {
addr = laddr
}
return nil, &OpError{mode, net, addr, err}
return nil, &OpError{Op: mode, Net: net, Addr: addr, Error: oserr}
}
// UnixAddr represents the address of a Unix domain socket end point.
@ -133,10 +133,7 @@ func (c *UnixConn) ok() bool { return c != nil && c.fd != nil }
// Implementation of the Conn interface - see Conn for documentation.
// Read reads data from the Unix domain connection.
//
// Read can be made to time out and return err == os.EAGAIN
// after a fixed time limit; see SetTimeout and SetReadTimeout.
// Read implements the net.Conn Read method.
func (c *UnixConn) Read(b []byte) (n int, err os.Error) {
if !c.ok() {
return 0, os.EINVAL
@ -144,10 +141,7 @@ func (c *UnixConn) Read(b []byte) (n int, err os.Error) {
return c.fd.Read(b)
}
// Write writes data to the Unix domain connection.
//
// Write can be made to time out and return err == os.EAGAIN
// after a fixed time limit; see SetTimeout and SetReadTimeout.
// Write implements the net.Conn Write method.
func (c *UnixConn) Write(b []byte) (n int, err os.Error) {
if !c.ok() {
return 0, os.EINVAL
@ -184,8 +178,7 @@ func (c *UnixConn) RemoteAddr() Addr {
return c.fd.raddr
}
// SetTimeout sets the read and write deadlines associated
// with the connection.
// SetTimeout implements the net.Conn SetTimeout method.
func (c *UnixConn) SetTimeout(nsec int64) os.Error {
if !c.ok() {
return os.EINVAL
@ -193,9 +186,7 @@ func (c *UnixConn) SetTimeout(nsec int64) os.Error {
return setTimeout(c.fd, nsec)
}
// SetReadTimeout sets the time (in nanoseconds) that
// Read will wait for data before returning os.EAGAIN.
// Setting nsec == 0 (the default) disables the deadline.
// SetReadTimeout implements the net.Conn SetReadTimeout method.
func (c *UnixConn) SetReadTimeout(nsec int64) os.Error {
if !c.ok() {
return os.EINVAL
@ -203,11 +194,7 @@ func (c *UnixConn) SetReadTimeout(nsec int64) os.Error {
return setReadTimeout(c.fd, nsec)
}
// SetWriteTimeout sets the time (in nanoseconds) that
// Write will wait to send its data before returning os.EAGAIN.
// Setting nsec == 0 (the default) disables the deadline.
// Even if write times out, it may return n > 0, indicating that
// some of the data was successfully written.
// SetWriteTimeout implements the net.Conn SetWriteTimeout method.
func (c *UnixConn) SetWriteTimeout(nsec int64) os.Error {
if !c.ok() {
return os.EINVAL
@ -237,8 +224,9 @@ func (c *UnixConn) SetWriteBuffer(bytes int) os.Error {
// It returns the number of bytes copied into b and the return address
// that was on the packet.
//
// ReadFromUnix can be made to time out and return err == os.EAGAIN
// after a fixed time limit; see SetTimeout and SetReadTimeout.
// ReadFromUnix can be made to time out and return
// an error with Timeout() == true after a fixed time limit;
// see SetTimeout and SetReadTimeout.
func (c *UnixConn) ReadFromUnix(b []byte) (n int, addr *UnixAddr, err os.Error) {
if !c.ok() {
return 0, nil, os.EINVAL
@ -251,12 +239,7 @@ func (c *UnixConn) ReadFromUnix(b []byte) (n int, addr *UnixAddr, err os.Error)
return
}
// ReadFrom reads a packet from c, copying the payload into b.
// It returns the number of bytes copied into b and the return address
// that was on the packet.
//
// ReadFrom can be made to time out and return err == os.EAGAIN
// after a fixed time limit; see SetTimeout and SetReadTimeout.
// ReadFrom implements the net.PacketConn ReadFrom method.
func (c *UnixConn) ReadFrom(b []byte) (n int, addr Addr, err os.Error) {
if !c.ok() {
return 0, nil, os.EINVAL
@ -267,9 +250,10 @@ func (c *UnixConn) ReadFrom(b []byte) (n int, addr Addr, err os.Error) {
// WriteToUnix writes a packet to addr via c, copying the payload from b.
//
// WriteToUnix can be made to time out and return err == os.EAGAIN
// after a fixed time limit; see SetTimeout and SetWriteTimeout.
// On packet-oriented connections such as UDP, write timeouts are rare.
// WriteToUnix can be made to time out and return
// an error with Timeout() == true after a fixed time limit;
// see SetTimeout and SetWriteTimeout.
// On packet-oriented connections, write timeouts are rare.
func (c *UnixConn) WriteToUnix(b []byte, addr *UnixAddr) (n int, err os.Error) {
if !c.ok() {
return 0, os.EINVAL
@ -281,11 +265,7 @@ func (c *UnixConn) WriteToUnix(b []byte, addr *UnixAddr) (n int, err os.Error) {
return c.fd.WriteTo(b, sa)
}
// WriteTo writes a packet to addr via c, copying the payload from b.
//
// WriteTo can be made to time out and return err == os.EAGAIN
// after a fixed time limit; see SetTimeout and SetWriteTimeout.
// On packet-oriented connections such as UDP, write timeouts are rare.
// WriteTo implements the net.PacketConn WriteTo method.
func (c *UnixConn) WriteTo(b []byte, addr Addr) (n int, err os.Error) {
if !c.ok() {
return 0, os.EINVAL
@ -325,17 +305,14 @@ func ListenUnix(net string, laddr *UnixAddr) (l *UnixListener, err os.Error) {
if laddr != nil {
laddr = &UnixAddr{laddr.Name, net == "unixgram"} // make our own copy
}
fd, e := unixSocket(net, laddr, nil, "listen")
if e != nil {
if pe, ok := e.(*os.PathError); ok {
e = pe.Error
}
return nil, e
fd, err := unixSocket(net, laddr, nil, "listen")
if err != nil {
return nil, err
}
e1 := syscall.Listen(fd.sysfd, 8) // listenBacklog());
if e1 != 0 {
syscall.Close(fd.sysfd)
return nil, &OpError{"listen", "unix", laddr, os.Errno(e1)}
return nil, &OpError{Op: "listen", Net: "unix", Addr: laddr, Error: os.Errno(e1)}
}
return &UnixListener{fd, laddr.Name}, nil
}

10
src/pkg/os/error.go
View File

@ -16,6 +16,8 @@ type Error interface {
type ErrorString string
func (e ErrorString) String() string { return string(e) }
func (e ErrorString) Temporary() bool { return false }
func (e ErrorString) Timeout() bool { return false }
// Note: If the name of the function NewError changes,
// pkg/go/doc/doc.go should be adjusted since it hardwires
@ -30,6 +32,14 @@ type Errno int64
func (e Errno) String() string { return syscall.Errstr(int(e)) }
func (e Errno) Temporary() bool {
return e == Errno(syscall.EINTR) || e.Timeout()
}
func (e Errno) Timeout() bool {
return e == Errno(syscall.EAGAIN) || e == Errno(syscall.EWOULDBLOCK)
}
// Commonly known Unix errors.
var (
EPERM Error = Errno(syscall.EPERM)