sys_zos_s390x.go raw

   1  // Copyright 2020 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  package socket
   6  
   7  import (
   8  	"net"
   9  	"syscall"
  10  	"unsafe"
  11  )
  12  
  13  func syscall_syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err syscall.Errno)
  14  func syscall_syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err syscall.Errno)
  15  
  16  func probeProtocolStack() int {
  17  	return 4 // sizeof(int) on GOOS=zos GOARCH=s390x
  18  }
  19  
  20  func getsockopt(s uintptr, level, name int, b []byte) (int, error) {
  21  	l := uint32(len(b))
  22  	_, _, errno := syscall_syscall6(syscall.SYS_GETSOCKOPT, s, uintptr(level), uintptr(name), uintptr(unsafe.Pointer(&b[0])), uintptr(unsafe.Pointer(&l)), 0)
  23  	return int(l), errnoErr(errno)
  24  }
  25  
  26  func setsockopt(s uintptr, level, name int, b []byte) error {
  27  	_, _, errno := syscall_syscall6(syscall.SYS_SETSOCKOPT, s, uintptr(level), uintptr(name), uintptr(unsafe.Pointer(&b[0])), uintptr(len(b)), 0)
  28  	return errnoErr(errno)
  29  }
  30  
  31  func recvmsg(s uintptr, buffers [][]byte, oob []byte, flags int, network string) (n, oobn int, recvflags int, from net.Addr, err error) {
  32  	var h msghdr
  33  	vs := make([]iovec, len(buffers))
  34  	var sa []byte
  35  	if network != "tcp" {
  36  		sa = make([]byte, sizeofSockaddrInet6)
  37  	}
  38  	h.pack(vs, buffers, oob, sa)
  39  	sn, _, errno := syscall_syscall(syscall.SYS___RECVMSG_A, s, uintptr(unsafe.Pointer(&h)), uintptr(flags))
  40  	n = int(sn)
  41  	oobn = h.controllen()
  42  	recvflags = h.flags()
  43  	err = errnoErr(errno)
  44  	if network != "tcp" {
  45  		var err2 error
  46  		from, err2 = parseInetAddr(sa, network)
  47  		if err2 != nil && err == nil {
  48  			err = err2
  49  		}
  50  	}
  51  	return
  52  }
  53  
  54  func sendmsg(s uintptr, buffers [][]byte, oob []byte, to net.Addr, flags int) (int, error) {
  55  	var h msghdr
  56  	vs := make([]iovec, len(buffers))
  57  	var sa []byte
  58  	if to != nil {
  59  		var a [sizeofSockaddrInet6]byte
  60  		n := marshalInetAddr(to, a[:])
  61  		sa = a[:n]
  62  	}
  63  	h.pack(vs, buffers, oob, sa)
  64  	n, _, errno := syscall_syscall(syscall.SYS___SENDMSG_A, s, uintptr(unsafe.Pointer(&h)), uintptr(flags))
  65  	return int(n), errnoErr(errno)
  66  }
  67