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// +build linux darwin dragonfly freebsd netbsd openbsd solaris illumos
package clickhouse
import (
"errors"
"fmt"
"io"
"syscall"
"time"
)
var errUnexpectedRead = errors.New("unexpected read from socket")
func (conn *connect) connCheck() error {
var sysErr error
sysConn, ok := conn.Conn.(syscall.Conn)
if !ok {
return nil
}
rawConn, err := sysConn.SyscallConn()
if err != nil {
return err
}
// If this connection has a ReadTimeout which we've been setting on
// reads, reset it to zero value before we attempt a non-blocking
// read, otherwise we may get os.ErrDeadlineExceeded for the cached
// connection from the pool with an expired timeout.
if conn.readTimeout != 0 {
err = conn.SetReadDeadline(time.Time{})
if err != nil {
return fmt.Errorf("set read deadline: %w", err)
}
conn.lastReadDeadlineTime = time.Time{}
}
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
}
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