mirror of
https://codeberg.org/forgejo/forgejo.git
synced 2024-12-23 19:34:14 +01:00
55 lines
1.1 KiB
Go
55 lines
1.1 KiB
Go
|
// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
|
||
|
|
//
|
||
|
|
// Copyright 2019 The Go-MySQL-Driver Authors. All rights reserved.
|
||
|
|
//
|
||
|
|
// This Source Code Form is subject to the terms of the Mozilla Public
|
||
|
|
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
|
||
|
|
// You can obtain one at http://mozilla.org/MPL/2.0/.
|
||
|
|
|
||
|
|
// +build linux darwin dragonfly freebsd netbsd openbsd solaris illumos
|
||
|
|
|
||
|
|
package mysql
|
||
|
|
|
||
|
|
import (
|
||
|
|
"errors"
|
||
|
|
"io"
|
||
|
|
"net"
|
||
|
|
"syscall"
|
||
|
|
)
|
||
|
|
|
||
|
|
var errUnexpectedRead = errors.New("unexpected read from socket")
|
||
|
|
|
||
|
|
func connCheck(conn net.Conn) error {
|
||
|
|
var sysErr error
|
||
|
|
|
||
|
|
sysConn, ok := conn.(syscall.Conn)
|
||
|
|
if !ok {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
rawConn, err := sysConn.SyscallConn()
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
err = rawConn.Read(func(fd uintptr) bool {
|
||
|
|
var buf [1]byte
|
||
|
|
n, err := syscall.Read(int(fd), buf[:])
|
||
|
|
switch {
|
||
|
|
case n == 0 && err == nil:
|
||
|
|
sysErr = io.EOF
|
||
|
|
case n > 0:
|
||
|
|
sysErr = errUnexpectedRead
|
||
|
|
case err == syscall.EAGAIN || err == syscall.EWOULDBLOCK:
|
||
|
|
sysErr = nil
|
||
|
|
default:
|
||
|
|
sysErr = err
|
||
|
|
}
|
||
|
|
return true
|
||
|
|
})
|
||
|
|
if err != nil {
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
return sysErr
|
||
|
|
}
|