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// Copyright 2014 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.devtools.build.lib.unix;
import com.google.devtools.build.lib.UnixJniLoader;
import com.google.devtools.build.lib.util.OS;
/**
* A subsclass of FileStatus which contains an errno.
* If there is an error, all other data fields are undefined.
*/
public class ErrnoFileStatus extends FileStatus {
private final int errno;
// These constants are passed in from JNI via ErrnoConstants.
public static final int ENOENT;
public static final int EACCES;
public static final int ELOOP;
public static final int ENOTDIR;
public static final int ENAMETOOLONG;
static {
ErrnoConstants constants = ErrnoConstants.getErrnoConstants();
ENOENT = constants.ENOENT;
EACCES = constants.EACCES;
ELOOP = constants.ELOOP;
ENOTDIR = constants.ENOTDIR;
ENAMETOOLONG = constants.ENAMETOOLONG;
}
/**
* Constructs a ErrnoFileSatus instance. (Called only from JNI code.)
*/
private ErrnoFileStatus(int st_mode, int st_atime, int st_atimensec, int st_mtime,
int st_mtimensec, int st_ctime, int st_ctimensec, long st_size,
int st_dev, long st_ino) {
super(st_mode, st_atime, st_atimensec, st_mtime, st_mtimensec, st_ctime, st_ctimensec, st_size,
st_dev, st_ino);
this.errno = 0;
}
/**
* Constructs a ErrnoFileSatus instance. (Called only from JNI code.)
*/
private ErrnoFileStatus(int errno) {
super(0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
this.errno = errno;
}
public int getErrno() {
return errno;
}
public boolean hasError() {
// errno = 0 means the operation succeeded.
return errno != 0;
}
// Used to transfer the constants from native to java code.
private static class ErrnoConstants {
// These are set in JNI.
private int ENOENT;
private int EACCES;
private int ELOOP;
private int ENOTDIR;
private int ENAMETOOLONG;
public static ErrnoConstants getErrnoConstants() {
ErrnoConstants constants = new ErrnoConstants();
if (OS.getCurrent() != OS.WINDOWS) {
constants.initErrnoConstants();
}
return constants;
}
static {
UnixJniLoader.loadJni();
}
private native void initErrnoConstants();
}
}
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