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internal/poll: handle zero-byte write in FD.WriteTo

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Zero-byte write was fixed by CL 132781, that was submitted 3 days ago.
But I just submitted CL 129137, and the CL broken zero-byte write
functionality without me noticing. CL 129137 was based on old commit
(older than 3 days ago), and try-bots did not discover the breakage.

Fix zero-byte write again.

Fixes windows build.

Change-Id: Ib403b25fd25cb881963f25706eecca92b924aaa1
Reviewed-on: https://go-review.googlesource.com/134275
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
This commit is contained in:
Alex Brainman 2018-09-09 14:21:25 +10:00
parent bbf9e6db0a
commit 1705962cf9
1 changed files with 11 additions and 0 deletions
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11
src/internal/poll/fd_windows.go
View File

@ -811,6 +811,17 @@ func (fd *FD) WriteTo(buf []byte, sa syscall.Sockaddr) (int, error) {
}
defer fd.writeUnlock()
if len(buf) == 0 {
// handle zero-byte payload
o := &fd.wop
o.InitBuf(buf)
o.sa = sa
n, err := wsrv.ExecIO(o, func(o *operation) error {
return syscall.WSASendto(o.fd.Sysfd, &o.buf, 1, &o.qty, 0, o.sa, &o.o, nil)
})
return n, err
}
ntotal := 0
for len(buf) > 0 {
b := buf