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|
//go:build linux
package eagain
import (
"io"
"golang.org/x/sys/unix"
"github.com/canonical/lxd/shared"
)
// Reader represents an io.Reader that handles EAGAIN.
type Reader struct {
Reader io.Reader
}
// Read behaves like io.Reader.Read but will retry on EAGAIN.
func (er Reader) Read(p []byte) (int, error) {
again:
n, err := er.Reader.Read(p)
if err == nil {
return n, nil
}
// keep retrying on EAGAIN
errno, ok := shared.GetErrno(err)
if ok && (errno == unix.EAGAIN || errno == unix.EINTR) {
goto again
}
return n, err
}
// Writer represents an io.Writer that handles EAGAIN.
type Writer struct {
Writer io.Writer
}
// Write behaves like io.Writer.Write but will retry on EAGAIN.
func (ew Writer) Write(p []byte) (int, error) {
again:
n, err := ew.Writer.Write(p)
if err == nil {
return n, nil
}
// keep retrying on EAGAIN
errno, ok := shared.GetErrno(err)
if ok && (errno == unix.EAGAIN || errno == unix.EINTR) {
goto again
}
return n, err
}
|
