| /* |
| * Copyright (c) 2001, 2005, 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 "sun_nio_ch_PollArrayWrapper.h" |
| #include <poll.h> |
| #include <unistd.h> |
| #include <sys/time.h> |
| |
| #define RESTARTABLE(_cmd, _result) do { \ |
| do { \ |
| _result = _cmd; \ |
| } while((_result == -1) && (errno == EINTR)); \ |
| } while(0) |
| |
| static int |
| ipoll(struct pollfd fds[], unsigned int nfds, int timeout) |
| { |
| jlong start, now; |
| int remaining = timeout; |
| struct timeval t; |
| int diff; |
| |
| gettimeofday(&t, NULL); |
| start = t.tv_sec * 1000 + t.tv_usec / 1000; |
| |
| for (;;) { |
| int res = poll(fds, nfds, remaining); |
| if (res < 0 && errno == EINTR) { |
| if (remaining >= 0) { |
| gettimeofday(&t, NULL); |
| now = t.tv_sec * 1000 + t.tv_usec / 1000; |
| diff = now - start; |
| remaining -= diff; |
| if (diff < 0 || remaining <= 0) { |
| return 0; |
| } |
| start = now; |
| } |
| } else { |
| return res; |
| } |
| } |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_sun_nio_ch_PollArrayWrapper_poll0(JNIEnv *env, jobject this, |
| jlong address, jint numfds, |
| jlong timeout) |
| { |
| struct pollfd *a; |
| int err = 0; |
| |
| a = (struct pollfd *) jlong_to_ptr(address); |
| |
| if (timeout <= 0) { /* Indefinite or no wait */ |
| RESTARTABLE (poll(a, numfds, timeout), err); |
| } else { /* Bounded wait; bounded restarts */ |
| err = ipoll(a, numfds, timeout); |
| } |
| |
| if (err < 0) { |
| JNU_ThrowIOExceptionWithLastError(env, "Poll failed"); |
| } |
| return (jint)err; |
| } |
| |
| JNIEXPORT void JNICALL |
| Java_sun_nio_ch_PollArrayWrapper_interrupt(JNIEnv *env, jobject this, jint fd) |
| { |
| int fakebuf[1]; |
| fakebuf[0] = 1; |
| if (write(fd, fakebuf, 1) < 0) { |
| JNU_ThrowIOExceptionWithLastError(env, |
| "Write to interrupt fd failed"); |
| } |
| } |