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Common infrastructure to create language launchers using the Polyglot API.
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/*
 * Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
 *
 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
 * derivative works of, display, perform, and distribute the Software and make,
 * use, sell, offer for sale, import, export, have made, and have sold the
 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
 *
 * This license is subject to the following condition:
 *
 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package org.graalvm.launcher;

import java.util.Arrays;
import java.util.List;

import org.graalvm.nativeimage.ImageSingletons;
import org.graalvm.nativeimage.Platform;
import org.graalvm.nativeimage.c.CContext;
import org.graalvm.nativeimage.c.function.CFunction;
import org.graalvm.nativeimage.c.type.CCharPointer;
import org.graalvm.nativeimage.c.type.CCharPointerPointer;

@CContext(NativeInterface.NativeDirectives.class)
class NativeInterface {

    class NativeDirectives implements CContext.Directives {
        @Override
        public List getHeaderFiles() {
            return Arrays.asList("", "", "");
        }

        @Override
        public List getMacroDefinitions() {
            return Arrays.asList("_GNU_SOURCE", "_LARGEFILE64_SOURCE");
        }
    }

    public static int errno() {
        if (Platform.includedIn(Platform.LINUX.class)) {
            return LinuxNativeInterface.errno();
        } else if (Platform.includedIn(Platform.DARWIN.class)) {
            return DarwinNativeInterface.errno();
        } else {
            // TODO: this should fail at image generation time
            throw new Error("Unsupported platform: " + ImageSingletons.lookup(Platform.class));
        }
    }

    @CFunction
    public static native CCharPointer strerror(int errnum);

    /** Execute PATH with arguments ARGV and environment from `environ'. */
    @CFunction
    public static native int execv(CCharPointer path, CCharPointerPointer argv);
}