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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 syscall "syscall"
// An Error can represent any printable error condition.
type Error interface {
String() string
}
// A helper type that can be embedded or wrapped to simplify satisfying
// Error.
type ErrorString string
func (e *ErrorString) String() string {
return *e
}
// Errno is the Unix error number. Names such as EINVAL are simple
// wrappers to convert the error number into an Error.
type Errno int64
func (e Errno) String() string {
return syscall.Errstr(e)
}
// ErrnoToError converts errno to an Error (underneath, an Errno).
// It returns nil for the "no error" errno.
func ErrnoToError(errno int64) Error {
if errno == 0 {
return nil
}
return Errno(errno)
}
// Commonly known Unix errors.
var (
ENONE Error = Errno(syscall.ENONE);
EPERM Error = Errno(syscall.EPERM);
ENOENT Error = Errno(syscall.ENOENT);
ESRCH Error = Errno(syscall.ESRCH);
EINTR Error = Errno(syscall.EINTR);
EIO Error = Errno(syscall.EIO);
ENXIO Error = Errno(syscall.ENXIO);
E2BIG Error = Errno(syscall.E2BIG);
ENOEXEC Error = Errno(syscall.ENOEXEC);
EBADF Error = Errno(syscall.EBADF);
ECHILD Error = Errno(syscall.ECHILD);
EDEADLK Error = Errno(syscall.EDEADLK);
ENOMEM Error = Errno(syscall.ENOMEM);
EACCES Error = Errno(syscall.EACCES);
EFAULT Error = Errno(syscall.EFAULT);
ENOTBLK Error = Errno(syscall.ENOTBLK);
EBUSY Error = Errno(syscall.EBUSY);
EEXIST Error = Errno(syscall.EEXIST);
EXDEV Error = Errno(syscall.EXDEV);
ENODEV Error = Errno(syscall.ENODEV);
ENOTDIR Error = Errno(syscall.ENOTDIR);
EISDIR Error = Errno(syscall.EISDIR);
EINVAL Error = Errno(syscall.EINVAL);
ENFILE Error = Errno(syscall.ENFILE);
EMFILE Error = Errno(syscall.EMFILE);
ENOTTY Error = Errno(syscall.ENOTTY);
ETXTBSY Error = Errno(syscall.ETXTBSY);
EFBIG Error = Errno(syscall.EFBIG);
ENOSPC Error = Errno(syscall.ENOSPC);
ESPIPE Error = Errno(syscall.ESPIPE);
EROFS Error = Errno(syscall.EROFS);
EMLINK Error = Errno(syscall.EMLINK);
EPIPE Error = Errno(syscall.EPIPE);
EAGAIN Error = Errno(syscall.EAGAIN);
EDOM Error = Errno(syscall.EDOM);
ERANGE Error = Errno(syscall.ERANGE);
)
// -----------------------
// Everything below here is deprecated.
// Delete when all callers of NewError are gone and their uses converted
// to the new error scheme (for an example, see template).
// _Error is a structure wrapping a string describing an error.
// Errors are singleton structures, created by NewError, so their addresses can
// be compared to test for equality. A nil Error pointer means ``no error''.
// Use the String() method to get the contents; it handles the nil case.
// The Error type is intended for use by any package that wishes to define
// error strings.
type _Error struct {
s string
}
// Table of all known errors in system. Use the same error string twice,
// get the same *os._Error.
var errorStringTab = make(map[string] Error);
// These functions contain a race if two goroutines add identical
// errors simultaneously but the consequences are unimportant.
// NewError allocates an Error object, but if s has been seen before,
// shares the _Error associated with that message.
func NewError(s string) Error {
if s == "" {
return nil
}
err, ok := errorStringTab[s];
if ok {
return err
}
err = &_Error{s};
errorStringTab[s] = err;
return err;
}
// String returns the string associated with the _Error.
func (e *_Error) String() string {
if e == nil {
return "No _Error"
}
return e.s
}
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