8293331: Refactor FileDispatcherImpl into operating system-specific components

Reviewed-by: alanb

src/java.base/macosx/native/libnio/ch/FileDispatcherImpl.c

@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2000, 2022, 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.
+ */
+
+#include <sys/mount.h>
+
+#include "jni.h"
+#include "nio.h"
+#include "nio_util.h"
+#include "sun_nio_ch_FileDispatcherImpl.h"
+
+static jlong
+handle(JNIEnv *env, jlong rv, char *msg)
+{
+    if (rv >= 0)
+        return rv;
+    if (errno == EINTR)
+        return IOS_INTERRUPTED;
+    JNU_ThrowIOExceptionWithLastError(env, msg);
+    return IOS_THROWN;
+}
+
+JNIEXPORT jint JNICALL
+Java_sun_nio_ch_FileDispatcherImpl_force0(JNIEnv *env, jobject this,
+                                          jobject fdo, jboolean md)
+{
+    jint fd = fdval(env, fdo);
+    int result = 0;
+
+    result = fcntl(fd, F_FULLFSYNC);
+    if (result == -1) {
+        struct statfs fbuf;
+        int errno_fcntl = errno;
+        if (fstatfs(fd, &fbuf) == 0) {
+            if ((fbuf.f_flags & MNT_LOCAL) == 0) {
+                /* Try fsync() in case file is not local. */
+                result = fsync(fd);
+            }
+        } else {
+            /* fstatfs() failed so restore errno from fcntl(). */
+            errno = errno_fcntl;
+        }
+    }
+
+    return handle(env, result, "Force failed");
+}
+
+JNIEXPORT jlong JNICALL
+Java_sun_nio_ch_FileDispatcherImpl_transferTo0(JNIEnv *env, jobject this,
+                                               jobject srcFDO,
+                                               jlong position, jlong count,
+                                               jobject dstFDO, jboolean append)
+{
+    jint srcFD = fdval(env, srcFDO);
+    jint dstFD = fdval(env, dstFDO);
+
+    off_t numBytes;
+    int result;
+
+    numBytes = count;
+
+    result = sendfile(srcFD, dstFD, position, &numBytes, NULL, 0);
+
+    if (numBytes > 0)
+        return numBytes;
+
+    if (result == -1) {
+        if (errno == EAGAIN)
+            return IOS_UNAVAILABLE;
+        if (errno == EOPNOTSUPP || errno == ENOTSOCK || errno == ENOTCONN)
+            return IOS_UNSUPPORTED_CASE;
+        if ((errno == EINVAL) && ((ssize_t)count >= 0))
+            return IOS_UNSUPPORTED_CASE;
+        if (errno == EINTR)
+            return IOS_INTERRUPTED;
+        JNU_ThrowIOExceptionWithLastError(env, "Transfer failed");
+        return IOS_THROWN;
+    }
+
+    return result;
+}