nio_util.h

/*
 * Copyright (c) 2001, 2020, 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 "jni.h"
#include "jni_util.h"
#include "jvm.h"
#include "jlong.h"
#include <errno.h>
#include <sys/types.h>
#include <sys/un.h>

#define RESTARTABLE(_cmd, _result) do { \
  do { \
    _result = _cmd; \
  } while((_result == -1) && (errno == EINTR)); \
} while(0)

/* Defines SO_REUSEPORT */
#ifndef SO_REUSEPORT
#ifdef __linux__
#define SO_REUSEPORT 15
#elif defined(AIX) || defined(MACOSX)
#define SO_REUSEPORT 0x0200
#else
#define SO_REUSEPORT 0
#endif
#endif

/* 2 bytes to allow for null at end of string and null at start of string
 * for abstract name
 */
#define MAX_UNIX_DOMAIN_PATH_LEN \
        (int)(sizeof(((struct sockaddr_un *)0)->sun_path)-2)

/* NIO utility procedures */


/* Defined in IOUtil.c */

jint fdval(JNIEnv *env, jobject fdo);
void setfdval(JNIEnv *env, jobject fdo, jint value);

jint convertReturnVal(JNIEnv *env, jint n, jboolean reading);
jlong convertLongReturnVal(JNIEnv *env, jlong n, jboolean reading);


/* Defined in Net.c */

jint handleSocketError(JNIEnv *env, jint errorValue);

/* Defined in UnixDomainSockets.c */

jbyteArray sockaddrToUnixAddressBytes(JNIEnv *env,
                                      struct sockaddr_un *sa,
                                      socklen_t len);

jint unixSocketAddressToSockaddr(JNIEnv *env,
                                jbyteArray uaddr,
                                struct sockaddr_un *sa,
                                int *len);