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sys_sendmsg_linux.go

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// 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.

package netpoll

import (

"syscall"

"unsafe"

)

//func init() {

// err := syscall.Setrlimit(8, &syscall.Rlimit{

// Cur: 0xffffffff,

// Max: 0xffffffff,

// })

// if err != nil {

// panic(err)

// }

//}

// 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: uint64(iovLen),

}

var flags uintptr

if zerocopy {

flags = MSG_ZEROCOPY

}

r, _, e := syscall.RawSyscall(syscall.SYS_SENDMSG, uintptr(fd), uintptr(unsafe.Pointer(&msghdr)), flags)

if e != 0 {

return int(r), syscall.Errno(e)

}

return int(r), nil

}