// Copyright 2012 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.

// +build darwin freebsd linux netbsd openbsd

package net

import (
	"io"
	"syscall"
	"testing"
)

// Issue 3590. netFd.AddFD should return an error
// from the underlying pollster rather than panicing.
func TestAddFDReturnsError(t *testing.T) {
	ln := newLocalListener(t).(*TCPListener)
	defer ln.Close()
	connected := make(chan bool)
	go func() {
		for {
			c, err := ln.Accept()
			if err != nil {
				return
			}
			connected <- true
			defer c.Close()
		}
	}()

	c, err := DialTCP("tcp", nil, ln.Addr().(*TCPAddr))
	if err != nil {
		t.Fatal(err)
	}
	defer c.Close()
	<-connected

	// replace c's pollServer with a closed version.
	ps, err := newPollServer()
	if err != nil {
		t.Fatal(err)
	}
	ps.poll.Close()
	c.conn.fd.pollServer = ps

	var b [1]byte
	_, err = c.Read(b[:])
	if err, ok := err.(*OpError); ok {
		if err.Op == "addfd" {
			return
		}
		if err, ok := err.Err.(*OpError); ok {
			// the err is sometimes wrapped by another OpError
			if err.Op == "addfd" {
				return
			}
		}
	}
	t.Error("unexpected error:", err)
}

var chkReadErrTests = []struct {
	n        int
	err      error
	fd       *netFD
	expected error
}{

	{100, nil, &netFD{sotype: syscall.SOCK_STREAM}, nil},
	{100, io.EOF, &netFD{sotype: syscall.SOCK_STREAM}, io.EOF},
	{100, errClosing, &netFD{sotype: syscall.SOCK_STREAM}, errClosing},
	{0, nil, &netFD{sotype: syscall.SOCK_STREAM}, io.EOF},
	{0, io.EOF, &netFD{sotype: syscall.SOCK_STREAM}, io.EOF},
	{0, errClosing, &netFD{sotype: syscall.SOCK_STREAM}, errClosing},

	{100, nil, &netFD{sotype: syscall.SOCK_DGRAM}, nil},
	{100, io.EOF, &netFD{sotype: syscall.SOCK_DGRAM}, io.EOF},
	{100, errClosing, &netFD{sotype: syscall.SOCK_DGRAM}, errClosing},
	{0, nil, &netFD{sotype: syscall.SOCK_DGRAM}, nil},
	{0, io.EOF, &netFD{sotype: syscall.SOCK_DGRAM}, io.EOF},
	{0, errClosing, &netFD{sotype: syscall.SOCK_DGRAM}, errClosing},

	{100, nil, &netFD{sotype: syscall.SOCK_SEQPACKET}, nil},
	{100, io.EOF, &netFD{sotype: syscall.SOCK_SEQPACKET}, io.EOF},
	{100, errClosing, &netFD{sotype: syscall.SOCK_SEQPACKET}, errClosing},
	{0, nil, &netFD{sotype: syscall.SOCK_SEQPACKET}, io.EOF},
	{0, io.EOF, &netFD{sotype: syscall.SOCK_SEQPACKET}, io.EOF},
	{0, errClosing, &netFD{sotype: syscall.SOCK_SEQPACKET}, errClosing},

	{100, nil, &netFD{sotype: syscall.SOCK_RAW}, nil},
	{100, io.EOF, &netFD{sotype: syscall.SOCK_RAW}, io.EOF},
	{100, errClosing, &netFD{sotype: syscall.SOCK_RAW}, errClosing},
	{0, nil, &netFD{sotype: syscall.SOCK_RAW}, nil},
	{0, io.EOF, &netFD{sotype: syscall.SOCK_RAW}, io.EOF},
	{0, errClosing, &netFD{sotype: syscall.SOCK_RAW}, errClosing},
}

func TestChkReadErr(t *testing.T) {
	for _, tt := range chkReadErrTests {
		actual := chkReadErr(tt.n, tt.err, tt.fd)
		if actual != tt.expected {
			t.Errorf("chkReadError(%v, %v, %v): expected %v, actual %v", tt.n, tt.err, tt.fd.sotype, tt.expected, actual)
		}
	}
}