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internal/poll: remove alloc sending IPv6 UDP on Windows

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This was an oversight in CL 331511.

Change-Id: Ibc20bf6ea80a8675d43d9691ed551dffab1d9215
Reviewed-on: https://go-review.googlesource.com/c/go/+/361254
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Trust: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2021-11-03 13:54:08 -07:00
parent fa19146038
commit 6049630520
1 changed files with 38 additions and 4 deletions
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42
src/internal/poll/fd_windows.go
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@ -857,7 +857,7 @@ func (fd *FD) WriteTo(buf []byte, sa syscall.Sockaddr) (int, error) {
return ntotal, nil
}
// WriteTo wraps the sendto network call for IPv4.
// WriteToInet4 is WriteTo, specialized for syscall.SockaddrInet4.
func (fd *FD) WriteToInet4(buf []byte, sa4 syscall.SockaddrInet4) (int, error) {
if err := fd.writeLock(); err != nil {
return 0, err
@ -896,9 +896,43 @@ func (fd *FD) WriteToInet4(buf []byte, sa4 syscall.SockaddrInet4) (int, error) {
return ntotal, nil
}
// WriteTo wraps the sendto network call for IPv6.
func (fd *FD) WriteToInet6(buf []byte, sa syscall.SockaddrInet6) (int, error) {
return fd.WriteTo(buf, &sa)
// WriteToInet6 is WriteTo, specialized for syscall.SockaddrInet6.
func (fd *FD) WriteToInet6(buf []byte, sa6 syscall.SockaddrInet6) (int, error) {
if err := fd.writeLock(); err != nil {
return 0, err
}
defer fd.writeUnlock()
if len(buf) == 0 {
// handle zero-byte payload
o := &fd.wop
o.InitBuf(buf)
o.sa6 = sa6
n, err := execIO(o, func(o *operation) error {
return windows.WSASendtoInet6(o.fd.Sysfd, &o.buf, 1, &o.qty, 0, o.sa6, &o.o, nil)
})
return n, err
}
ntotal := 0
for len(buf) > 0 {
b := buf
if len(b) > maxRW {
b = b[:maxRW]
}
o := &fd.wop
o.InitBuf(b)
o.sa6 = sa6
n, err := execIO(o, func(o *operation) error {
return windows.WSASendtoInet6(o.fd.Sysfd, &o.buf, 1, &o.qty, 0, o.sa6, &o.o, nil)
})
ntotal += int(n)
if err != nil {
return ntotal, err
}
buf = buf[n:]
}
return ntotal, nil
}
// Call ConnectEx. This doesn't need any locking, since it is only