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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"
)
// Portable analogs of some common system call errors.
var (
ErrInvalid = errors.New("invalid argument")
ErrPermission = errors.New("permission denied")
ErrExist = errors.New("file already exists")
ErrNotExist = errors.New("file does not exist")
)
// PathError records an error and the operation and file path that caused it.
type PathError struct {
Op string
Path string
Err error
}
func (e *PathError) Error() string { return e.Op + " " + e.Path + ": " + e.Err.Error() }
// 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() }
// NewSyscallError returns, as an error, a new SyscallError
// with the given system call name and error details.
// As a convenience, if err is nil, NewSyscallError returns nil.
func NewSyscallError(syscall string, err error) error {
if err == nil {
return nil
}
return &SyscallError{syscall, err}
}
// IsExist returns whether the error is known to report that a file or directory
// already exists. It is satisfied by ErrExist as well as some syscall errors.
func IsExist(err error) bool {
return isExist(err)
}
// IsNotExist returns whether the error is known to report that a file or directory
// does not exist. It is satisfied by ErrNotExist as well as some syscall errors.
func IsNotExist(err error) bool {
return isNotExist(err)
}
// IsPermission returns whether the error is known to report that permission is denied.
// It is satisfied by ErrPermission as well as some syscall errors.
func IsPermission(err error) bool {
return isPermission(err)
}
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