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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 string(e) }
func (e ErrorString) Temporary() bool { return false }
func (e ErrorString) Timeout() bool { return false }
// Note: If the name of the function NewError changes,
// pkg/go/doc/doc.go should be adjusted since it hardwires
// this name in a heuristic.
// NewError converts s to an ErrorString, which satisfies the Error interface.
func NewError(s string) Error { return ErrorString(s) }
// 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(int(e)) }
func (e Errno) Temporary() bool {
return e == Errno(syscall.EINTR) || e.Timeout()
}
func (e Errno) Timeout() bool {
return e == Errno(syscall.EAGAIN) || e == Errno(syscall.EWOULDBLOCK)
}
// Commonly known Unix errors.
var (
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)
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)
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)
EADDRINUSE Error = Errno(syscall.EADDRINUSE)
ECONNREFUSED Error = Errno(syscall.ECONNREFUSED)
ENAMETOOLONG Error = Errno(syscall.ENAMETOOLONG)
EAFNOSUPPORT Error = Errno(syscall.EAFNOSUPPORT)
)
// PathError records an error and the operation and file path that caused it.
type PathError struct {
Op string
Path string
Error Error
}
func (e *PathError) String() string { return e.Op + " " + e.Path + ": " + e.Error.String() }
// SyscallError records an error from a specific system call.
type SyscallError struct {
Syscall string
Errno Errno
}
func (e *SyscallError) String() string { return e.Syscall + ": " + e.Errno.String() }
// Note: If the name of the function NewSyscallError changes,
// pkg/go/doc/doc.go should be adjusted since it hardwires
// this name in a heuristic.
// NewSyscallError returns, as an Error, a new SyscallError
// with the given system call name and error number.
// As a convenience, if errno is 0, NewSyscallError returns nil.
func NewSyscallError(syscall string, errno int) Error {
if errno == 0 {
return nil
}
return &SyscallError{syscall, Errno(errno)}
}
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