// Copyright 2021 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.

// illumos system calls not present on Solaris.

//go:build amd64 && illumos

// +build amd64,illumos

package unix

import (

	"unsafe"

)

func bytes2iovec(bs [][]byte) []Iovec {

	iovecs := make([]Iovec, len(bs))

	for i, b := range bs {

		iovecs[i].SetLen(len(b))

		if len(b) > 0 {

			iovecs[i].Base = &b[0]

		} else {

			iovecs[i].Base = (*byte)(unsafe.Pointer(&_zero))

		}

	}

	return iovecs

}

//sys	readv(fd int, iovs []Iovec) (n int, err error)

func Readv(fd int, iovs [][]byte) (n int, err error) {

	iovecs := bytes2iovec(iovs)

	n, err = readv(fd, iovecs)

	return n, err

}

//sys	preadv(fd int, iovs []Iovec, off int64) (n int, err error)

func Preadv(fd int, iovs [][]byte, off int64) (n int, err error) {

	iovecs := bytes2iovec(iovs)

	n, err = preadv(fd, iovecs, off)

	return n, err

}

//sys	writev(fd int, iovs []Iovec) (n int, err error)

func Writev(fd int, iovs [][]byte) (n int, err error) {

	iovecs := bytes2iovec(iovs)

	n, err = writev(fd, iovecs)

	return n, err

}

//sys	pwritev(fd int, iovs []Iovec, off int64) (n int, err error)

func Pwritev(fd int, iovs [][]byte, off int64) (n int, err error) {

	iovecs := bytes2iovec(iovs)

	n, err = pwritev(fd, iovecs, off)

	return n, err

}

//sys	accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error) = libsocket.accept4

func Accept4(fd int, flags int) (nfd int, sa Sockaddr, err error) {

	var rsa RawSockaddrAny

	var len _Socklen = SizeofSockaddrAny

	nfd, err = accept4(fd, &rsa, &len, flags)

	if err != nil {

		return

	}

	if len > SizeofSockaddrAny {

		panic("RawSockaddrAny too small")

	}

	sa, err = anyToSockaddr(fd, &rsa)

	if err != nil {

		Close(nfd)

		nfd = 0

	}

	return

}