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// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package socket
import (
"net"
"syscall"
"unsafe"
)
func syscall_syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err syscall.Errno)
func syscall_syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err syscall.Errno)
func probeProtocolStack() int {
return 4 // sizeof(int) on GOOS=zos GOARCH=s390x
}
func getsockopt(s uintptr, level, name int, b []byte) (int, error) {
l := uint32(len(b))
_, _, errno := syscall_syscall6(syscall.SYS_GETSOCKOPT, s, uintptr(level), uintptr(name), uintptr(unsafe.Pointer(&b[0])), uintptr(unsafe.Pointer(&l)), 0)
return int(l), errnoErr(errno)
}
func setsockopt(s uintptr, level, name int, b []byte) error {
_, _, errno := syscall_syscall6(syscall.SYS_SETSOCKOPT, s, uintptr(level), uintptr(name), uintptr(unsafe.Pointer(&b[0])), uintptr(len(b)), 0)
return errnoErr(errno)
}
func recvmsg(s uintptr, buffers [][]byte, oob []byte, flags int, network string) (n, oobn int, recvflags int, from net.Addr, err error) {
var h msghdr
vs := make([]iovec, len(buffers))
var sa []byte
if network != "tcp" {
sa = make([]byte, sizeofSockaddrInet6)
}
h.pack(vs, buffers, oob, sa)
sn, _, errno := syscall_syscall(syscall.SYS___RECVMSG_A, s, uintptr(unsafe.Pointer(&h)), uintptr(flags))
n = int(sn)
oobn = h.controllen()
recvflags = h.flags()
err = errnoErr(errno)
if network != "tcp" {
var err2 error
from, err2 = parseInetAddr(sa, network)
if err2 != nil && err == nil {
err = err2
}
}
return
}
func sendmsg(s uintptr, buffers [][]byte, oob []byte, to net.Addr, flags int) (int, error) {
var h msghdr
vs := make([]iovec, len(buffers))
var sa []byte
if to != nil {
var a [sizeofSockaddrInet6]byte
n := marshalInetAddr(to, a[:])
sa = a[:n]
}
h.pack(vs, buffers, oob, sa)
n, _, errno := syscall_syscall(syscall.SYS___SENDMSG_A, s, uintptr(unsafe.Pointer(&h)), uintptr(flags))
return int(n), errnoErr(errno)
}
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