1 /*
   2  * Copyright (c) 2014, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 #include <errno.h>
  27 #include <sys/socket.h>
  28 #include <stropts.h>
  29 #include <unistd.h>
  30 #include "jvm.h"
  31 #include "net_util.h"
  32 
  33 /* Support for restartable system calls on Solaris. */
  34 
  35 #define RESTARTABLE_RETURN_INT(_cmd) do {             \
  36     int _result;                                      \
  37     if (1) {                                          \
  38         do {                                          \
  39             _result = _cmd;                           \
  40         } while((_result == -1) && (errno == EINTR));      \
  41         return _result;                               \
  42     }                                                 \
  43 } while(0)
  44 
  45 int NET_Read(int s, void* buf, size_t len) {
  46     RESTARTABLE_RETURN_INT(recv(s, buf, len, 0));
  47 }
  48 
  49 int NET_NonBlockingRead(int s, void* buf, size_t len) {
  50     RESTARTABLE_RETURN_INT(recv(s, buf, len, MSG_DONTWAIT));
  51 }
  52 
  53 int NET_RecvFrom(int s, void *buf, int len, unsigned int flags,
  54                  struct sockaddr *from, socklen_t *fromlen) {
  55     RESTARTABLE_RETURN_INT(recvfrom(s, buf, len, flags, from, fromlen));
  56 }
  57 
  58 int NET_ReadV(int s, const struct iovec * vector, int count) {
  59     RESTARTABLE_RETURN_INT(readv(s, vector, count));
  60 }
  61 
  62 int NET_WriteV(int s, const struct iovec * vector, int count) {
  63     RESTARTABLE_RETURN_INT(writev(s, vector, count));
  64 }
  65 
  66 int NET_Send(int s, void *msg, int len, unsigned int flags) {
  67     RESTARTABLE_RETURN_INT(send(s, msg, len, flags));
  68 }
  69 
  70 int NET_SendTo(int s, const void *msg, int len,  unsigned  int flags,
  71                const struct sockaddr *to, int tolen) {
  72     RESTARTABLE_RETURN_INT(sendto(s, msg, len, flags, to, tolen));
  73 }
  74 
  75 int NET_Connect(int s, struct sockaddr *addr, int addrlen) {
  76     RESTARTABLE_RETURN_INT(connect(s, addr, addrlen));
  77 }
  78 
  79 int NET_Accept(int s, struct sockaddr *addr, socklen_t *addrlen) {
  80     RESTARTABLE_RETURN_INT(accept(s, addr, addrlen));
  81 }
  82 
  83 int NET_SocketClose(int fd) {
  84     return close(fd);
  85 }
  86 
  87 int NET_Dup2(int fd, int fd2) {
  88     return dup2(fd, fd2);
  89 }
  90 
  91 int NET_Poll(struct pollfd *ufds, unsigned int nfds, int timeout) {
  92     RESTARTABLE_RETURN_INT(poll(ufds, nfds, timeout));
  93 }
  94 
  95 int NET_Timeout(JNIEnv *env, int s, long timeout, long nanoTimeStamp) {
  96     int result;
  97     long prevNanoTime = nanoTimeStamp;
  98     long nanoTimeout = timeout * NET_NSEC_PER_MSEC;
  99     struct pollfd pfd;
 100     pfd.fd = s;
 101     pfd.events = POLLIN;
 102 
 103     for(;;) {
 104         result = poll(&pfd, 1, nanoTimeout / NET_NSEC_PER_MSEC);
 105         if (result < 0 && errno == EINTR) {
 106             long newNanoTime = JVM_NanoTime(env, 0);
 107             nanoTimeout -= newNanoTime - prevNanoTime;
 108             if (nanoTimeout < NET_NSEC_PER_MSEC)
 109                 return 0;
 110             prevNanoTime = newNanoTime;
 111         } else {
 112             return result;
 113         }
 114     }
 115 }