| /* |
| * Copyright (c) 2002, 2017, 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. |
| */ |
| |
| /* |
| */ |
| |
| /* Maximum number of sockets per select() */ |
| /* This number should be equal to WindowsSelectorImpl.MAX_SELECTABLE_FDS */ |
| /* This definition MUST precede the inclusion of winsock2.h */ |
| |
| #define FD_SETSIZE 1024 |
| |
| #include <limits.h> |
| #include <stdlib.h> |
| #include <winsock2.h> |
| |
| #include "jvm.h" |
| #include "jni.h" |
| #include "jni_util.h" |
| #include "sun_nio_ch_WindowsSelectorImpl.h" |
| #include "sun_nio_ch_PollArrayWrapper.h" |
| |
| #include "nio_util.h" /* Needed for POLL* constants (includes "winsock2.h") */ |
| |
| typedef struct { |
| jint fd; |
| jshort events; |
| } pollfd; |
| |
| #define WAKEUP_SOCKET_BUF_SIZE 16 |
| |
| |
| JNIEXPORT jint JNICALL |
| Java_sun_nio_ch_WindowsSelectorImpl_00024SubSelector_poll0(JNIEnv *env, jobject this, |
| jlong pollAddress, jint numfds, |
| jintArray returnReadFds, jintArray returnWriteFds, |
| jintArray returnExceptFds, jlong timeout) |
| { |
| DWORD result = 0; |
| pollfd *fds = (pollfd *) pollAddress; |
| int i; |
| FD_SET readfds, writefds, exceptfds; |
| struct timeval timevalue, *tv; |
| static struct timeval zerotime = {0, 0}; |
| int read_count = 0, write_count = 0, except_count = 0; |
| |
| #ifdef _WIN64 |
| int resultbuf[FD_SETSIZE + 1]; |
| #endif |
| |
| if (timeout == 0) { |
| tv = &zerotime; |
| } else if (timeout < 0) { |
| tv = NULL; |
| } else { |
| jlong sec = timeout / 1000; |
| tv = &timevalue; |
| // |
| // struct timeval members are signed 32-bit integers so the |
| // signed 64-bit jlong needs to be clamped |
| // |
| if (sec > INT_MAX) { |
| tv->tv_sec = INT_MAX; |
| tv->tv_usec = 0; |
| } else { |
| tv->tv_sec = (long)sec; |
| tv->tv_usec = (long)((timeout % 1000) * 1000); |
| } |
| } |
| |
| /* Set FD_SET structures required for select */ |
| for (i = 0; i < numfds; i++) { |
| if (fds[i].events & POLLIN) { |
| readfds.fd_array[read_count] = fds[i].fd; |
| read_count++; |
| } |
| if (fds[i].events & (POLLOUT | POLLCONN)) |
| { |
| writefds.fd_array[write_count] = fds[i].fd; |
| write_count++; |
| } |
| exceptfds.fd_array[except_count] = fds[i].fd; |
| except_count++; |
| } |
| |
| readfds.fd_count = read_count; |
| writefds.fd_count = write_count; |
| exceptfds.fd_count = except_count; |
| |
| /* Call select */ |
| if ((result = select(0 , &readfds, &writefds, &exceptfds, tv)) |
| == SOCKET_ERROR) { |
| /* Bad error - this should not happen frequently */ |
| /* Iterate over sockets and call select() on each separately */ |
| FD_SET errreadfds, errwritefds, errexceptfds; |
| readfds.fd_count = 0; |
| writefds.fd_count = 0; |
| exceptfds.fd_count = 0; |
| for (i = 0; i < numfds; i++) { |
| /* prepare select structures for the i-th socket */ |
| errreadfds.fd_count = 0; |
| errwritefds.fd_count = 0; |
| if (fds[i].events & POLLIN) { |
| errreadfds.fd_array[0] = fds[i].fd; |
| errreadfds.fd_count = 1; |
| } |
| if (fds[i].events & (POLLOUT | POLLCONN)) |
| { |
| errwritefds.fd_array[0] = fds[i].fd; |
| errwritefds.fd_count = 1; |
| } |
| errexceptfds.fd_array[0] = fds[i].fd; |
| errexceptfds.fd_count = 1; |
| |
| /* call select on the i-th socket */ |
| if (select(0, &errreadfds, &errwritefds, &errexceptfds, &zerotime) |
| == SOCKET_ERROR) { |
| /* This socket causes an error. Add it to exceptfds set */ |
| exceptfds.fd_array[exceptfds.fd_count] = fds[i].fd; |
| exceptfds.fd_count++; |
| } else { |
| /* This socket does not cause an error. Process result */ |
| if (errreadfds.fd_count == 1) { |
| readfds.fd_array[readfds.fd_count] = fds[i].fd; |
| readfds.fd_count++; |
| } |
| if (errwritefds.fd_count == 1) { |
| writefds.fd_array[writefds.fd_count] = fds[i].fd; |
| writefds.fd_count++; |
| } |
| if (errexceptfds.fd_count == 1) { |
| exceptfds.fd_array[exceptfds.fd_count] = fds[i].fd; |
| exceptfds.fd_count++; |
| } |
| } |
| } |
| } |
| |
| /* Return selected sockets. */ |
| /* Each Java array consists of sockets count followed by sockets list */ |
| |
| #ifdef _WIN64 |
| resultbuf[0] = readfds.fd_count; |
| for (i = 0; i < (int)readfds.fd_count; i++) { |
| resultbuf[i + 1] = (int)readfds.fd_array[i]; |
| } |
| (*env)->SetIntArrayRegion(env, returnReadFds, 0, |
| readfds.fd_count + 1, resultbuf); |
| |
| resultbuf[0] = writefds.fd_count; |
| for (i = 0; i < (int)writefds.fd_count; i++) { |
| resultbuf[i + 1] = (int)writefds.fd_array[i]; |
| } |
| (*env)->SetIntArrayRegion(env, returnWriteFds, 0, |
| writefds.fd_count + 1, resultbuf); |
| |
| resultbuf[0] = exceptfds.fd_count; |
| for (i = 0; i < (int)exceptfds.fd_count; i++) { |
| resultbuf[i + 1] = (int)exceptfds.fd_array[i]; |
| } |
| (*env)->SetIntArrayRegion(env, returnExceptFds, 0, |
| exceptfds.fd_count + 1, resultbuf); |
| #else |
| (*env)->SetIntArrayRegion(env, returnReadFds, 0, |
| readfds.fd_count + 1, (jint *)&readfds); |
| |
| (*env)->SetIntArrayRegion(env, returnWriteFds, 0, |
| writefds.fd_count + 1, (jint *)&writefds); |
| (*env)->SetIntArrayRegion(env, returnExceptFds, 0, |
| exceptfds.fd_count + 1, (jint *)&exceptfds); |
| #endif |
| return 0; |
| } |
| |
| JNIEXPORT void JNICALL |
| Java_sun_nio_ch_WindowsSelectorImpl_setWakeupSocket0(JNIEnv *env, jclass this, |
| jint scoutFd) |
| { |
| /* Write one byte into the pipe */ |
| const char byte = 1; |
| send(scoutFd, &byte, 1, 0); |
| } |
| |
| JNIEXPORT void JNICALL |
| Java_sun_nio_ch_WindowsSelectorImpl_resetWakeupSocket0(JNIEnv *env, jclass this, |
| jint scinFd) |
| { |
| char bytes[WAKEUP_SOCKET_BUF_SIZE]; |
| long bytesToRead; |
| |
| /* Drain socket */ |
| /* Find out how many bytes available for read */ |
| ioctlsocket (scinFd, FIONREAD, &bytesToRead); |
| if (bytesToRead == 0) { |
| return; |
| } |
| /* Prepare corresponding buffer if needed, and then read */ |
| if (bytesToRead > WAKEUP_SOCKET_BUF_SIZE) { |
| char* buf = (char*)malloc(bytesToRead); |
| recv(scinFd, buf, bytesToRead, 0); |
| free(buf); |
| } else { |
| recv(scinFd, bytes, WAKEUP_SOCKET_BUF_SIZE, 0); |
| } |
| } |
| |
| JNIEXPORT jboolean JNICALL |
| Java_sun_nio_ch_WindowsSelectorImpl_discardUrgentData(JNIEnv* env, jobject this, |
| jint s) |
| { |
| char data[8]; |
| jboolean discarded = JNI_FALSE; |
| int n; |
| do { |
| n = recv(s, (char*)&data, sizeof(data), MSG_OOB); |
| if (n > 0) { |
| discarded = JNI_TRUE; |
| } |
| } while (n > 0); |
| return discarded; |
| } |