From 8b060d0c3a46ba7787b12fd08b7b7136b5faf222 Mon Sep 17 00:00:00 2001
From: Markus KARG <markus@headcrashing.eu>
Date: Sun, 2 Jun 2024 17:58:33 +0000
Subject: [PATCH] Removing Linux-specific SocketDispatcher, as copy_file_range
 does not accept /dev/nnull target

---
 .../linux/native/libnio/ch/SocketDispatcher.c | 122 ------------------
 1 file changed, 122 deletions(-)
 delete mode 100644 src/java.base/linux/native/libnio/ch/SocketDispatcher.c

diff --git a/src/java.base/linux/native/libnio/ch/SocketDispatcher.c b/src/java.base/linux/native/libnio/ch/SocketDispatcher.c
deleted file mode 100644
index 41bd1bf51342d..0000000000000
--- a/src/java.base/linux/native/libnio/ch/SocketDispatcher.c
+++ /dev/null
@@ -1,122 +0,0 @@
-/*
- * Copyright (c) 2019, 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/types.h>
- #include <sys/uio.h>
- #include <unistd.h>
-
- #include "jni.h"
- #include "jni_util.h"
- #include "jlong.h"
- #include "nio.h"
- #include "nio_util.h"
- #include "sun_nio_ch_SocketDispatcher.h"
-
-// MAX_SKIP_BUFFER_SIZE is used to determine the maximum buffer size to
-// use when skipping.
-static const ssize_t MAX_SKIP_BUFFER_SIZE = 4096;
-
- JNIEXPORT jint JNICALL
- Java_sun_nio_ch_SocketDispatcher_read0(JNIEnv *env, jclass clazz,
-                                        jobject fdo, jlong address, jint len)
- {
-     jint fd = fdval(env, fdo);
-     void *buf = (void *)jlong_to_ptr(address);
-     jint n = read(fd, buf, len);
-     if ((n == -1) && (errno == ECONNRESET || errno == EPIPE)) {
-         JNU_ThrowByName(env, "sun/net/ConnectionResetException", "Connection reset");
-         return IOS_THROWN;
-     } else {
-         return convertReturnVal(env, n, JNI_TRUE);
-     }
- }
-
- JNIEXPORT jlong JNICALL
- Java_sun_nio_ch_SocketDispatcher_readv0(JNIEnv *env, jclass clazz,
-                                         jobject fdo, jlong address, jint len)
- {
-     jint fd = fdval(env, fdo);
-     struct iovec *iov = (struct iovec *)jlong_to_ptr(address);
-     jlong n = readv(fd, iov, len);
-     if ((n == -1) && (errno == ECONNRESET || errno == EPIPE)) {
-         JNU_ThrowByName(env, "sun/net/ConnectionResetException", "Connection reset");
-         return IOS_THROWN;
-     } else {
-         return convertLongReturnVal(env, n, JNI_TRUE);
-     }
- }
-
-JNIEXPORT jint JNICALL
-Java_sun_nio_ch_SocketDispatcher_write0(JNIEnv *env, jclass clazz,
-                                        jobject fdo, jlong address, jint len)
-{
-    jint fd = fdval(env, fdo);
-    void *buf = (void *)jlong_to_ptr(address);
-
-    return convertReturnVal(env, write(fd, buf, len), JNI_FALSE);
-}
-
-JNIEXPORT jlong JNICALL
-Java_sun_nio_ch_SocketDispatcher_writev0(JNIEnv *env, jclass clazz,
-                                         jobject fdo, jlong address, jint len)
-{
-    jint fd = fdval(env, fdo);
-    struct iovec *iov = (struct iovec *)jlong_to_ptr(address);
-    return convertLongReturnVal(env, writev(fd, iov, len), JNI_FALSE);
-}
-
-JNIEXPORT jlong JNICALL
-Java_sun_nio_ch_SocketDispatcher_skip0(JNIEnv *env, jclass cl, jobject fdo, jlong n)
-{
-    if (n < 1)
-        return 0;
-
-    const jint fd = fdval(env, fdo);
-
-    const long bs = n < MAX_SKIP_BUFFER_SIZE ? (long) n : MAX_SKIP_BUFFER_SIZE;
-    char buf[bs];
-    jlong tn = 0;
-
-    for (;;) {
-        const jlong remaining = n - tn;
-        const ssize_t count = remaining < bs ? (ssize_t) remaining : bs;
-        const ssize_t nr = read(fd, buf, count);
-        if (nr < 0) {
-            if (errno == EAGAIN || errno == EWOULDBLOCK) {
-                return tn;
-            } else if (errno == EINTR) {
-                return IOS_INTERRUPTED;
-            } else {
-                JNU_ThrowIOExceptionWithLastError(env, "read");
-                return IOS_THROWN;
-            }
-        }
-        if (nr > 0)
-            tn += nr;
-        if (nr == bs)
-            continue;
-        return tn;
-    }
-}