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/*
* Copyright (C) 2011 The Android Open Source Project
*
* 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 android.system;
import java.io.IOException;
import java.net.SocketException;
import libcore.io.Libcore;
/**
* A checked exception thrown when {@link Os} methods fail. This exception contains the native
* errno value, for comparison against the constants in {@link OsConstants}, should sophisticated
* callers need to adjust their behavior based on the exact failure.
*/
public final class ErrnoException extends Exception {
private final String functionName;
/**
* The errno value, for comparison with the {@code E} constants in {@link OsConstants}.
*/
public final int errno;
/**
* Constructs an instance with the given function name and errno value.
*/
public ErrnoException(String functionName, int errno) {
this.functionName = functionName;
this.errno = errno;
}
/**
* Constructs an instance with the given function name, errno value, and cause.
*/
public ErrnoException(String functionName, int errno, Throwable cause) {
super(cause);
this.functionName = functionName;
this.errno = errno;
}
/**
* Converts the stashed function name and errno value to a human-readable string.
* We do this here rather than in the constructor so that callers only pay for
* this if they need it.
*/
@Override public String getMessage() {
String errnoName = OsConstants.errnoName(errno);
if (errnoName == null) {
errnoName = "errno " + errno;
}
String description = Libcore.os.strerror(errno);
return functionName + " failed: " + errnoName + " (" + description + ")";
}
/**
* @hide - internal use only.
*/
public IOException rethrowAsIOException() throws IOException {
IOException newException = new IOException(getMessage());
newException.initCause(this);
throw newException;
}
/**
* @hide - internal use only.
*/
public SocketException rethrowAsSocketException() throws SocketException {
throw new SocketException(getMessage(), this);
}
}
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