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/*
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* Copyright (c) 2001, 2005, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include "jni.h"
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#include "jni_util.h"
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#include "jvm.h"
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#include "jlong.h"
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#include "sun_nio_ch_PollArrayWrapper.h"
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#include <poll.h>
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#include <unistd.h>
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#include <sys/time.h>
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#define RESTARTABLE(_cmd, _result) do { \
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do { \
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_result = _cmd; \
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} while((_result == -1) && (errno == EINTR)); \
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} while(0)
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static int
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ipoll(struct pollfd fds[], unsigned int nfds, int timeout)
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{
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jlong start, now;
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int remaining = timeout;
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struct timeval t;
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int diff;
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gettimeofday(&t, NULL);
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start = t.tv_sec * 1000 + t.tv_usec / 1000;
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for (;;) {
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int res = poll(fds, nfds, remaining);
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if (res < 0 && errno == EINTR) {
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if (remaining >= 0) {
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gettimeofday(&t, NULL);
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now = t.tv_sec * 1000 + t.tv_usec / 1000;
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diff = now - start;
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remaining -= diff;
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if (diff < 0 || remaining <= 0) {
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return 0;
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}
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start = now;
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}
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} else {
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return res;
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}
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}
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}
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JNIEXPORT jint JNICALL
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Java_sun_nio_ch_PollArrayWrapper_poll0(JNIEnv *env, jobject this,
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jlong address, jint numfds,
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jlong timeout)
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{
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struct pollfd *a;
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int err = 0;
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a = (struct pollfd *) jlong_to_ptr(address);
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if (timeout <= 0) { /* Indefinite or no wait */
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RESTARTABLE (poll(a, numfds, timeout), err);
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} else { /* Bounded wait; bounded restarts */
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err = ipoll(a, numfds, timeout);
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}
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if (err < 0) {
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JNU_ThrowIOExceptionWithLastError(env, "Poll failed");
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}
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return (jint)err;
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}
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JNIEXPORT void JNICALL
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Java_sun_nio_ch_PollArrayWrapper_interrupt(JNIEnv *env, jobject this, jint fd)
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{
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int fakebuf[1];
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fakebuf[0] = 1;
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if (write(fd, fakebuf, 1) < 0) {
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JNU_ThrowIOExceptionWithLastError(env,
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"Write to interrupt fd failed");
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}
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}
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