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syscall: add socket control message support for darwin, freebsd, linux

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R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4528113
This commit is contained in:
Mikio Hara 2011-06-20 18:40:20 -04:00 • committed by Russ Cox
parent 97a929aac9
commit 5d6f118f23
14 changed files with 263 additions and 13 deletions
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82
src/pkg/syscall/syscall_bsd.go
View file

@ -425,6 +425,80 @@ func Sendto(fd int, p []byte, flags int, to Sockaddr) (errno int) {
return sendto(fd, p, flags, ptr, n)
}
//sys recvmsg(s int, msg *Msghdr, flags int) (n int, errno int)
func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, errno int) {
var msg Msghdr
var rsa RawSockaddrAny
msg.Name = (*byte)(unsafe.Pointer(&rsa))
msg.Namelen = uint32(SizeofSockaddrAny)
var iov Iovec
if len(p) > 0 {
iov.Base = (*byte)(unsafe.Pointer(&p[0]))
iov.SetLen(len(p))
}
var dummy byte
if len(oob) > 0 {
// receive at least one normal byte
if len(p) == 0 {
iov.Base = &dummy
iov.SetLen(1)
}
msg.Control = (*byte)(unsafe.Pointer(&oob[0]))
msg.SetControllen(len(oob))
}
msg.Iov = &iov
msg.Iovlen = 1
if n, errno = recvmsg(fd, &msg, flags); errno != 0 {
return
}
oobn = int(msg.Controllen)
recvflags = int(msg.Flags)
// source address is only specified if the socket is unconnected
if rsa.Addr.Family != AF_UNSPEC {
from, errno = anyToSockaddr(&rsa)
}
return
}
//sys sendmsg(s int, msg *Msghdr, flags int) (errno int)
func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (errno int) {
var ptr uintptr
var salen _Socklen
if to != nil {
var err int
ptr, salen, err = to.sockaddr()
if err != 0 {
return err
}
}
var msg Msghdr
msg.Name = (*byte)(unsafe.Pointer(ptr))
msg.Namelen = uint32(salen)
var iov Iovec
if len(p) > 0 {
iov.Base = (*byte)(unsafe.Pointer(&p[0]))
iov.SetLen(len(p))
}
var dummy byte
if len(oob) > 0 {
// send at least one normal byte
if len(p) == 0 {
iov.Base = &dummy
iov.SetLen(1)
}
msg.Control = (*byte)(unsafe.Pointer(&oob[0]))
msg.SetControllen(len(oob))
}
msg.Iov = &iov
msg.Iovlen = 1
if errno = sendmsg(fd, &msg, flags); errno != 0 {
return
}
return
}
// TODO:
// FreeBSD has IP_SENDIF. Darwin probably needs BSDLLCTest, see:
// http://developer.apple.com/mac/library/samplecode/BSDLLCTest/index.html
@ -540,14 +614,6 @@ func Futimes(fd int, tv []Timeval) (errno int) {
//sys fcntl(fd int, cmd int, arg int) (val int, errno int)
func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, errno int) {
return 0, 0, 0, nil, EAFNOSUPPORT
}
func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (errno int) {
return EAFNOSUPPORT
}
// TODO: wrap
// Acct(name nil-string) (errno int)
// Gethostuuid(uuid *byte, timeout *Timespec) (errno int)