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// Copyright 2009 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.
package syscall
import "internal/oserror"
// An Errno is an unsigned number describing an error condition.
// It implements the error interface. The zero Errno is by convention
// a non-error, so code to convert from Errno to error should use:
//
// err = nil
// if errno != 0 {
// err = errno
// }
//
// Errno values can be tested against error values from the os package
// using errors.Is. For example:
//
// _, _, err := syscall.Syscall(...)
// if errors.Is(err, fs.ErrNotExist) ...
type Errno uintptr
func (e Errno) Error() string {
return Errstr(int(e))
}
func (e Errno) Is(target error) bool {
switch target {
case oserror.ErrPermission:
return e == EACCES || e == EPERM
case oserror.ErrExist:
return e == EEXIST || e == ENOTEMPTY
case oserror.ErrNotExist:
return e == ENOENT
}
return false
}
func (e Errno) Temporary() bool {
return e == EINTR || e == EMFILE || e == ENFILE || e.Timeout()
}
func (e Errno) Timeout() bool {
return e == EAGAIN || e == EWOULDBLOCK || e == ETIMEDOUT
}
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