cgo_unix_syscall.go

     1  // Copyright 2022 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 !netgo && darwin
     6  
     7  package net
     8  
     9  import (
    10  	"internal/syscall/unix"
    11  	"runtime"
    12  	"syscall"
    13  	"unsafe"
    14  )
    15  
    16  const (
    17  	_C_AF_INET        = syscall.AF_INET
    18  	_C_AF_INET6       = syscall.AF_INET6
    19  	_C_AF_UNSPEC      = syscall.AF_UNSPEC
    20  	_C_EAI_ADDRFAMILY = unix.EAI_ADDRFAMILY
    21  	_C_EAI_AGAIN      = unix.EAI_AGAIN
    22  	_C_EAI_NONAME     = unix.EAI_NONAME
    23  	_C_EAI_SERVICE    = unix.EAI_SERVICE
    24  	_C_EAI_NODATA     = unix.EAI_NODATA
    25  	_C_EAI_OVERFLOW   = unix.EAI_OVERFLOW
    26  	_C_EAI_SYSTEM     = unix.EAI_SYSTEM
    27  	_C_IPPROTO_TCP    = syscall.IPPROTO_TCP
    28  	_C_IPPROTO_UDP    = syscall.IPPROTO_UDP
    29  	_C_SOCK_DGRAM     = syscall.SOCK_DGRAM
    30  	_C_SOCK_STREAM    = syscall.SOCK_STREAM
    31  )
    32  
    33  type (
    34  	_C_char               = byte
    35  	_C_int                = int32
    36  	_C_uchar              = byte
    37  	_C_uint               = uint32
    38  	_C_socklen_t          = int
    39  	_C_struct___res_state = unix.ResState
    40  	_C_struct_addrinfo    = unix.Addrinfo
    41  	_C_struct_sockaddr    = syscall.RawSockaddr
    42  )
    43  
    44  func _C_free(p unsafe.Pointer) { runtime.KeepAlive(p) }
    45  
    46  func _C_malloc(n uintptr) unsafe.Pointer {
    47  	if n <= 0 {
    48  		n = 1
    49  	}
    50  	return unsafe.Pointer(&make([]byte, n)[0])
    51  }
    52  
    53  func _C_ai_addr(ai *_C_struct_addrinfo) **_C_struct_sockaddr { return &ai.Addr }
    54  func _C_ai_family(ai *_C_struct_addrinfo) *_C_int            { return &ai.Family }
    55  func _C_ai_flags(ai *_C_struct_addrinfo) *_C_int             { return &ai.Flags }
    56  func _C_ai_next(ai *_C_struct_addrinfo) **_C_struct_addrinfo { return &ai.Next }
    57  func _C_ai_protocol(ai *_C_struct_addrinfo) *_C_int          { return &ai.Protocol }
    58  func _C_ai_socktype(ai *_C_struct_addrinfo) *_C_int          { return &ai.Socktype }
    59  
    60  func _C_freeaddrinfo(ai *_C_struct_addrinfo) {
    61  	unix.Freeaddrinfo(ai)
    62  }
    63  
    64  func _C_gai_strerror(eai _C_int) string {
    65  	return unix.GaiStrerror(int(eai))
    66  }
    67  
    68  func _C_getaddrinfo(hostname, servname *byte, hints *_C_struct_addrinfo, res **_C_struct_addrinfo) (int, error) {
    69  	return unix.Getaddrinfo(hostname, servname, hints, res)
    70  }
    71  
    72  func _C_res_ninit(state *_C_struct___res_state) error {
    73  	unix.ResNinit(state)
    74  	return nil
    75  }
    76  
    77  func _C_res_nsearch(state *_C_struct___res_state, dname *_C_char, class, typ int, ans *_C_char, anslen int) int {
    78  	x, _ := unix.ResNsearch(state, dname, class, typ, ans, anslen)
    79  	return x
    80  }
    81  
    82  func _C_res_nclose(state *_C_struct___res_state) {
    83  	unix.ResNclose(state)
    84  }
    85  
    86  func cgoNameinfoPTR(b []byte, sa *syscall.RawSockaddr, salen int) (int, error) {
    87  	gerrno, err := unix.Getnameinfo(sa, salen, &b[0], len(b), nil, 0, unix.NI_NAMEREQD)
    88  	return int(gerrno), err
    89  }
    90  
    91  func cgoSockaddrInet4(ip IP) *syscall.RawSockaddr {
    92  	sa := syscall.RawSockaddrInet4{Len: syscall.SizeofSockaddrInet4, Family: syscall.AF_INET}
    93  	copy(sa.Addr[:], ip)
    94  	return (*syscall.RawSockaddr)(unsafe.Pointer(&sa))
    95  }
    96  
    97  func cgoSockaddrInet6(ip IP, zone int) *syscall.RawSockaddr {
    98  	sa := syscall.RawSockaddrInet6{Len: syscall.SizeofSockaddrInet6, Family: syscall.AF_INET6, Scope_id: uint32(zone)}
    99  	copy(sa.Addr[:], ip)
   100  	return (*syscall.RawSockaddr)(unsafe.Pointer(&sa))
   101  }
   102
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