8360025: (se) Convert kqueue Selector Implementation to use FFM APIs

src/java.base/macosx/classes/jdk/internal/ffi/generated/ErrnoUtils.java

@@ -0,0 +1,53 @@
+
+/*
+ * Copyright (c) 2024, 2025 Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.internal.ffi.generated;
+
+import jdk.internal.ffi.generated.errno.errno_h;
+
+import java.io.IOException;
+import java.lang.foreign.Arena;
+import java.lang.foreign.MemorySegment;
+import java.nio.charset.StandardCharsets;
+
+// Errno utility for macosx platform
+public final class ErrnoUtils {
+    private ErrnoUtils() {
+    }
+
+    private static final long ERRNO_STRING_HOLDER_ARRAY_SIZE = 256L;
+
+    public static IOException IOExceptionWithLastError(int errno, String message, Arena arena) {
+        MemorySegment buf = arena.allocate(ERRNO_STRING_HOLDER_ARRAY_SIZE);
+        if (errno_h.strerror_r(errno, buf, ERRNO_STRING_HOLDER_ARRAY_SIZE) == 0) {
+            String errnoMsg = buf.getString(0, StandardCharsets.UTF_8);
+            return new IOException(message + " " + errnoMsg);
+        } else {
+            // failed to convert errno to string - output errno value
+            return new IOException(message + " Errno: " + errno);
+        }
+    }
+}

src/java.base/macosx/classes/jdk/internal/ffi/generated/errno/errno_h.java

@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+// Generated by jextract
+
+package jdk.internal.ffi.generated.errno;
+
+import jdk.internal.ffi.util.FFMUtils;
+
+import java.lang.invoke.*;
+import java.lang.foreign.*;
+
+@SuppressWarnings("restricted")
+public class errno_h {
+
+    errno_h() {
+        // Should not be called directly
+    }
+
+    private static final int EINTR = (int)4L;
+    /**
+     * {@snippet lang=c :
+     * #define EINTR 4
+     * }
+     */
+    public static int EINTR() {
+        return EINTR;
+    }
+
+    private static class strerror_r {
+        public static final FunctionDescriptor DESC = FunctionDescriptor.of(
+                FFMUtils.C_INT,
+                FFMUtils.C_INT,
+                FFMUtils.C_POINTER,
+                FFMUtils.C_LONG
+        );
+
+        public static final MemorySegment ADDR = FFMUtils.findOrThrow("strerror_r");
+
+        public static final MethodHandle HANDLE = Linker.nativeLinker().downcallHandle(ADDR, DESC);
+    }
+
+    /**
+     * Function descriptor for:
+     * {@snippet lang=c :
+     * int strerror_r(int __errnum, char *__strerrbuf, size_t __buflen)
+     * }
+     */
+    public static FunctionDescriptor strerror_r$descriptor() {
+        return strerror_r.DESC;
+    }
+
+    /**
+     * Downcall method handle for:
+     * {@snippet lang=c :
+     * int strerror_r(int __errnum, char *__strerrbuf, size_t __buflen)
+     * }
+     */
+    public static MethodHandle strerror_r$handle() {
+        return strerror_r.HANDLE;
+    }
+
+    /**
+     * Address for:
+     * {@snippet lang=c :
+     * int strerror_r(int __errnum, char *__strerrbuf, size_t __buflen)
+     * }
+     */
+    public static MemorySegment strerror_r$address() {
+        return strerror_r.ADDR;
+    }
+
+    /**
+     * {@snippet lang=c :
+     * int strerror_r(int __errnum, char *__strerrbuf, size_t __buflen)
+     * }
+     */
+    public static int strerror_r(int __errnum, MemorySegment __strerrbuf, long __buflen) {
+        var mh$ = strerror_r.HANDLE;
+        try {
+            if (FFMUtils.TRACE_DOWNCALLS) {
+                FFMUtils.traceDowncall("strerror_r", __errnum, __strerrbuf, __buflen);
+            }
+            return (int)mh$.invokeExact(__errnum, __strerrbuf, __buflen);
+        } catch (Throwable ex$) {
+            throw new AssertionError("should not reach here", ex$);
+        }
+    }
+}

src/java.base/macosx/classes/jdk/internal/ffi/generated/errno/package-info.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2024, 2025, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * Defines native structures for errno APIs.
+ * Generated with the following jextract command:
+ * {@snippet lang = "Shell Script":
+ *
+ * HEADER_NAME=errno.h
+ * echo "#include <errno.h>" > $HEADER_NAME
+ * echo "#include <string.h>" >> $HEADER_NAME
+ *
+ * jextract --target-package jdk.internal.ffi.generated.errno \
+ *    --include-constant EINTR \
+ *    --include-function strerror_r \
+ *    $HEADER_NAME
+ * }
+ *
+ * After generation of native bindings, the layouts for the C builtin layouts and other
+ * variables/methods not specific to a component area are moved to the {@code BindingUtils} class
+ * for future reusability.
+ *
+ */
+
+package jdk.internal.ffi.generated.errno;