luni/src/main/native/java_io_Console.cpp

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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.
 */

#include "JNIHelp.h"

#include <errno.h>
#include <termios.h>
#include <unistd.h>

static jboolean java_io_Console_isatty(JNIEnv*, jclass, jint fd) {
    return TEMP_FAILURE_RETRY(isatty(fd));
}

static jint java_io_Console_setEcho(JNIEnv* env, jclass, jboolean on, jint previousState) {
    termios state;
    if (TEMP_FAILURE_RETRY(tcgetattr(STDIN_FILENO, &state)) == -1) {
        jniThrowIOException(env, errno);
        return 0;
    }
    if (on) {
        state.c_lflag = previousState;
    } else {
        previousState = state.c_lflag;
        state.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
    }
    if (TEMP_FAILURE_RETRY(tcsetattr(STDIN_FILENO, TCSAFLUSH, &state)) == -1){
        jniThrowIOException(env, errno);
        return 0;
    }
    return previousState;
}

static JNINativeMethod gMethods[] = {
    { "isatty", "(I)Z", (void*) java_io_Console_isatty },
    { "setEchoImpl", "(ZI)I", (void*) java_io_Console_setEcho },
};
int register_java_io_Console(JNIEnv* env) {
    return jniRegisterNativeMethods(env, "java/io/Console", gMethods, NELEM(gMethods));
}