1 files changed, 83 insertions, 0 deletions
diff --git a/src/pkg/os/error.go b/src/pkg/os/error.go
new file mode 100644
index 000000000..718499b21
--- /dev/null
+++ b/src/pkg/os/error.go
@@ -0,0 +1,83 @@
+// 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)
+}
+
+// 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))
+}
+
+// ErrnoToError converts errno to an Error (underneath, an Errno).
+// It returns nil for the "no error" errno.
+func ErrnoToError(errno int) Error {
+	if errno == 0 {
+		return nil
+	}
+	return Errno(errno)
+}
+
+// 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);
+	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);
+	EADDRINUSE Error = Errno(syscall.EADDRINUSE);
+	ECONNREFUSED Error = Errno(syscall.ECONNREFUSED);
+	ENAMETOOLONG Error = Errno(syscall.ENAMETOOLONG);
+)
+