add lib/os to standard build

break lib/os into multiple source files

R=rsc
DELTA=189  (178 added, 4 deleted, 7 changed)
OCL=15149
CL=15152

1 files changed, 76 insertions, 0 deletions

diff --git a/src/lib/os/os_error.go b/src/lib/os/os_error.go
new file mode 100644
index 000000000..2da63da5a
--- /dev/null
+++ b/src/lib/os/os_error.go
@@ -0,0 +1,76 @@
+// 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"
+
+// Errors are singleton structures. Use the Print()/String() methods to get their contents --
+// they handle the nil (no error) case.
+export type Error struct {
+	s string
+}
+
+var ErrorTab = new(map[int64] *Error);
+
+export func ErrnoToError(errno int64) *Error {
+	if errno == 0 {
+		return nil
+	}
+	err, ok := ErrorTab[errno]
+	if ok {
+		return err
+	}
+	e := new(Error);
+	e.s = syscall.errstr(errno);
+	ErrorTab[errno] = e;
+	return e;
+}
+export var (
+	ENONE = ErrnoToError(syscall.ENONE);
+	EPERM = ErrnoToError(syscall.EPERM);
+	ENOENT = ErrnoToError(syscall.ENOENT);
+	ESRCH = ErrnoToError(syscall.ESRCH);
+	EINTR = ErrnoToError(syscall.EINTR);
+	EIO = ErrnoToError(syscall.EIO);
+	ENXIO = ErrnoToError(syscall.ENXIO);
+	E2BIG = ErrnoToError(syscall.E2BIG);
+	ENOEXEC = ErrnoToError(syscall.ENOEXEC);
+	EBADF = ErrnoToError(syscall.EBADF);
+	ECHILD = ErrnoToError(syscall.ECHILD);
+	EDEADLK = ErrnoToError(syscall.EDEADLK);
+	ENOMEM = ErrnoToError(syscall.ENOMEM);
+	EACCES = ErrnoToError(syscall.EACCES);
+	EFAULT = ErrnoToError(syscall.EFAULT);
+	ENOTBLK = ErrnoToError(syscall.ENOTBLK);
+	EBUSY = ErrnoToError(syscall.EBUSY);
+	EEXIST = ErrnoToError(syscall.EEXIST);
+	EXDEV = ErrnoToError(syscall.EXDEV);
+	ENODEV = ErrnoToError(syscall.ENODEV);
+	ENOTDIR = ErrnoToError(syscall.ENOTDIR);
+	EISDIR = ErrnoToError(syscall.EISDIR);
+	EINVAL = ErrnoToError(syscall.EINVAL);
+	ENFILE = ErrnoToError(syscall.ENFILE);
+	EMFILE = ErrnoToError(syscall.EMFILE);
+	ENOTTY = ErrnoToError(syscall.ENOTTY);
+	ETXTBSY = ErrnoToError(syscall.ETXTBSY);
+	EFBIG = ErrnoToError(syscall.EFBIG);
+	ENOSPC = ErrnoToError(syscall.ENOSPC);
+	ESPIPE = ErrnoToError(syscall.ESPIPE);
+	EROFS = ErrnoToError(syscall.EROFS);
+	EMLINK = ErrnoToError(syscall.EMLINK);
+	EPIPE = ErrnoToError(syscall.EPIPE);
+	EDOM = ErrnoToError(syscall.EDOM);
+	ERANGE = ErrnoToError(syscall.ERANGE);
+	EAGAIN = ErrnoToError(syscall.EAGAIN);
+)
+const NoError = "No Error"
+
+func (e *Error) String() string {
+	if e == nil {
+		return NoError
+	} else {
+		return e.s
+	}
+}