Stowage/go
2
0
Fork 0
mirror of https://github.com/golang/go.git synced 2025-12-08 06:10:04 +00:00
Code Issues Projects Releases Packages Wiki Activity

syscall, net: Add Recvmsg and Sendmsg on Linux.

Browse source 
Working on issue 1101.

R=rsc
CC=golang-dev
https://golang.org/cl/2331044
This commit is contained in:
Albert Strasheim 2010-12-07 13:40:14 -05:00 • committed by Russ Cox
parent ed7c3f3127
commit cf6c212197
11 changed files with 326 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

68
src/pkg/syscall/syscall_linux.go
View file

@ -447,6 +447,72 @@ func Sendto(fd int, p []byte, flags int, to Sockaddr) (errno int) {
return sendto(fd, p, flags, ptr, n)
}
func Recvmsg(fd int, p, oob []byte, from Sockaddr, flags int) (n, oobn int, recvflags int, 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)
return
}
func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (errno int) {
var ptr uintptr
var nsock _Socklen
if to != nil {
var err int
ptr, nsock, err = to.sockaddr()
if err != 0 {
return err
}
}
var msg Msghdr
msg.Name = (*byte)(unsafe.Pointer(ptr))
msg.Namelen = uint32(nsock)
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
}
// BindToDevice binds the socket associated with fd to device.
func BindToDevice(fd int, device string) (errno int) {
return SetsockoptString(fd, SOL_SOCKET, SO_BINDTODEVICE, device)
@ -592,8 +658,6 @@ func PtraceDetach(pid int) (errno int) { return ptrace(PTRACE_DETACH, pid, 0, 0)
// Sendto
// Recvfrom
// Sendmsg
// Recvmsg
// Socketpair
// Getsockopt