/*

 * Copyright (c) 2014, 2019, 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 <errno.h>

#include <sys/socket.h>

#include <stropts.h>

#include <unistd.h>

#include "jvm.h"

#include "net_util.h"

/* Support for restartable system calls on Solaris. */

#define RESTARTABLE_RETURN_INT(_cmd) do {             \

    int _result;                                      \

    if (1) {                                          \

        do {                                          \

            _result = _cmd;                           \

        } while((_result == -1) && (errno == EINTR));      \

        return _result;                               \

    }                                                 \

} while(0)

int NET_Read(int s, void* buf, size_t len) {

    RESTARTABLE_RETURN_INT(recv(s, buf, len, 0));

}

int NET_NonBlockingRead(int s, void* buf, size_t len) {

    RESTARTABLE_RETURN_INT(recv(s, buf, len, MSG_DONTWAIT));

}

int NET_RecvFrom(int s, void *buf, int len, unsigned int flags,

                 struct sockaddr *from, socklen_t *fromlen) {

    RESTARTABLE_RETURN_INT(recvfrom(s, buf, len, flags, from, fromlen));

}

int NET_Send(int s, void *msg, int len, unsigned int flags) {

    RESTARTABLE_RETURN_INT(send(s, msg, len, flags));

}

int NET_SendTo(int s, const void *msg, int len,  unsigned  int flags,

               const struct sockaddr *to, int tolen) {

    RESTARTABLE_RETURN_INT(sendto(s, msg, len, flags, to, tolen));

}

int NET_Connect(int s, struct sockaddr *addr, int addrlen) {

    RESTARTABLE_RETURN_INT(connect(s, addr, addrlen));

}

int NET_Accept(int s, struct sockaddr *addr, socklen_t *addrlen) {

    RESTARTABLE_RETURN_INT(accept(s, addr, addrlen));

}

int NET_SocketClose(int fd) {

    return close(fd);

}

int NET_Dup2(int fd, int fd2) {

    return dup2(fd, fd2);

}

int NET_Poll(struct pollfd *ufds, unsigned int nfds, int timeout) {

    RESTARTABLE_RETURN_INT(poll(ufds, nfds, timeout));

}

int NET_Timeout(JNIEnv *env, int s, long timeout, jlong nanoTimeStamp) {

    int result;

    jlong prevNanoTime = nanoTimeStamp;

    jlong nanoTimeout = (jlong) timeout * NET_NSEC_PER_MSEC;

    struct pollfd pfd;

    pfd.fd = s;

    pfd.events = POLLIN;

    for(;;) {

        result = poll(&pfd, 1, nanoTimeout / NET_NSEC_PER_MSEC);

        if (result < 0 && errno == EINTR) {

            jlong newNanoTime = JVM_NanoTime(env, 0);

            nanoTimeout -= newNanoTime - prevNanoTime;

            if (nanoTimeout < NET_NSEC_PER_MSEC)

                return 0;

            prevNanoTime = newNanoTime;

        } else {

            return result;

        }

    }

}