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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 os
import (
"errors"
"io/fs"
"syscall"
)
// Portable analogs of some common system call errors.
//
// Errors returned from this package may be tested against these errors
// with errors.Is.
var (
// ErrInvalid indicates an invalid argument.
// Methods on File will return this error when the receiver is nil.
ErrInvalid = fs.ErrInvalid // "invalid argument"
ErrPermission = fs.ErrPermission // "permission denied"
ErrExist = fs.ErrExist // "file already exists"
ErrNotExist = fs.ErrNotExist // "file does not exist"
ErrClosed = fs.ErrClosed // "file already closed"
// Note that these are exported for use in the Filesystem interface.
ErrUnsupported = errors.New("operation not supported")
ErrNotImplemented = errors.New("operation not implemented")
)
// The following code is copied from the official implementation.
// src/internal/poll/fd.go
// ErrNoDeadline is returned when a request is made to set a deadline
// on a file type that does not use the poller.
var ErrNoDeadline = errors.New("file type does not support deadline")
// ErrDeadlineExceeded is returned for an expired deadline.
// This is exported by the os package as os.ErrDeadlineExceeded.
var ErrDeadlineExceeded error = &DeadlineExceededError{}
// DeadlineExceededError is returned for an expired deadline.
type DeadlineExceededError struct{}
// Implement the net.Error interface.
// The string is "i/o timeout" because that is what was returned
// by earlier Go versions. Changing it may break programs that
// match on error strings.
func (e *DeadlineExceededError) Error() string { return "i/o timeout" }
func (e *DeadlineExceededError) Timeout() bool { return true }
func (e *DeadlineExceededError) Temporary() bool { return true }
// The following code is copied from the official implementation.
// https://github.com/golang/go/blob/4ce6a8e89668b87dce67e2f55802903d6eb9110a/src/os/error.go#L65-L104
func NewSyscallError(syscall string, err error) error {
if err == nil {
return nil
}
return &SyscallError{syscall, err}
}
// PathError records an error and the operation and file path that caused it.
type PathError = fs.PathError
// SyscallError records an error from a specific system call.
type SyscallError struct {
Syscall string
Err error
}
func (e *SyscallError) Error() string { return e.Syscall + ": " + e.Err.Error() }
func (e *SyscallError) Unwrap() error { return e.Err }
type timeout interface {
Timeout() bool
}
// Timeout reports whether this error represents a timeout.
func (e *SyscallError) Timeout() bool {
t, ok := e.Err.(timeout)
return ok && t.Timeout()
}
func IsExist(err error) bool {
return underlyingErrorIs(err, ErrExist)
}
func IsNotExist(err error) bool {
return underlyingErrorIs(err, ErrNotExist)
}
func IsPermission(err error) bool {
return underlyingErrorIs(err, ErrPermission)
}
func IsTimeout(err error) bool {
terr, ok := underlyingError(err).(timeout)
return ok && terr.Timeout()
}
func underlyingErrorIs(err, target error) bool {
// Note that this function is not errors.Is:
// underlyingError only unwraps the specific error-wrapping types
// that it historically did, not all errors implementing Unwrap().
err = underlyingError(err)
if err == target {
return true
}
// To preserve prior behavior, only examine syscall errors.
e, ok := err.(syscall.Errno)
return ok && e.Is(target)
}
// underlyingError returns the underlying error for known os error types.
func underlyingError(err error) error {
switch err := err.(type) {
case *PathError:
return err.Err
case *SyscallError:
return err.Err
}
return err
}
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