// Copyright 2021 CloudWeGo Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build darwin dragonfly freebsd netbsd openbsd
package netpoll
import (
"syscall"
"unsafe"
)
var supportZeroCopySend bool
// sendmsg wraps the sendmsg system call.
// Must len(iovs) >= len(vs)
func sendmsg(fd int, bs [][]byte, ivs []syscall.Iovec, zerocopy bool) (n int, err error) {
iovLen := iovecs(bs, ivs)
if iovLen == 0 {
return 0, nil
}
var msghdr = syscall.Msghdr{
Iov: &ivs[0],
Iovlen: int32(iovLen),
}
// flags = syscall.MSG_DONTWAIT
r, _, e := syscall.RawSyscall(syscall.SYS_SENDMSG, uintptr(fd), uintptr(unsafe.Pointer(&msghdr)), uintptr(0))
resetIovecs(bs, ivs[:iovLen])
if e != 0 {
return int(r), syscall.Errno(e)
}
return int(r), nil
}
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