github.com/hxx258456/ccgo@v0.0.5-0.20230213014102-48b35f46f66f/net/internal/socket/msghdr_bsd.go (about)

     1  // Copyright 2017 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build aix || darwin || dragonfly || freebsd || netbsd || openbsd
     6  // +build aix darwin dragonfly freebsd netbsd openbsd
     7  
     8  package socket
     9  
    10  import "unsafe"
    11  
    12  func (h *msghdr) pack(vs []iovec, bs [][]byte, oob []byte, sa []byte) {
    13  	for i := range vs {
    14  		vs[i].set(bs[i])
    15  	}
    16  	h.setIov(vs)
    17  	if len(oob) > 0 {
    18  		h.Control = (*byte)(unsafe.Pointer(&oob[0]))
    19  		h.Controllen = uint32(len(oob))
    20  	}
    21  	if sa != nil {
    22  		h.Name = (*byte)(unsafe.Pointer(&sa[0]))
    23  		h.Namelen = uint32(len(sa))
    24  	}
    25  }
    26  
    27  func (h *msghdr) name() []byte {
    28  	if h.Name != nil && h.Namelen > 0 {
    29  		return (*[sizeofSockaddrInet6]byte)(unsafe.Pointer(h.Name))[:h.Namelen]
    30  	}
    31  	return nil
    32  }
    33  
    34  func (h *msghdr) controllen() int {
    35  	return int(h.Controllen)
    36  }
    37  
    38  func (h *msghdr) flags() int {
    39  	return int(h.Flags)
    40  }