1 /*
2 * Copyright (c) 1997, 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
1524 }
1525 errno = en;
1526 }
1527 #endif
1528
1529 return rv;
1530 }
1531
1532 /**
1533 * Wrapper for poll with timeout on a single file descriptor.
1534 *
1535 * flags (defined in net_util_md.h can be any combination of
1536 * NET_WAIT_READ, NET_WAIT_WRITE & NET_WAIT_CONNECT.
1537 *
1538 * The function will return when either the socket is ready for one
1539 * of the specified operations or the timeout expired.
1540 *
1541 * It returns the time left from the timeout (possibly 0), or -1 if it expired.
1542 */
1543
1544 jint
1545 NET_Wait(JNIEnv *env, jint fd, jint flags, jint timeout)
1546 {
1547 jlong prevNanoTime = JVM_NanoTime(env, 0);
1548 jlong nanoTimeout = (jlong) timeout * NET_NSEC_PER_MSEC;
1549 jint read_rv;
1550
1551 while (1) {
1552 jlong newNanoTime;
1553 struct pollfd pfd;
1554 pfd.fd = fd;
1555 pfd.events = 0;
1556 if (flags & NET_WAIT_READ)
1557 pfd.events |= POLLIN;
1558 if (flags & NET_WAIT_WRITE)
1559 pfd.events |= POLLOUT;
1560 if (flags & NET_WAIT_CONNECT)
1561 pfd.events |= POLLOUT;
1562
1563 errno = 0;
1564 read_rv = NET_Poll(&pfd, 1, nanoTimeout / NET_NSEC_PER_MSEC);
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1 /*
2 * Copyright (c) 1997, 2018, 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
1524 }
1525 errno = en;
1526 }
1527 #endif
1528
1529 return rv;
1530 }
1531
1532 /**
1533 * Wrapper for poll with timeout on a single file descriptor.
1534 *
1535 * flags (defined in net_util_md.h can be any combination of
1536 * NET_WAIT_READ, NET_WAIT_WRITE & NET_WAIT_CONNECT.
1537 *
1538 * The function will return when either the socket is ready for one
1539 * of the specified operations or the timeout expired.
1540 *
1541 * It returns the time left from the timeout (possibly 0), or -1 if it expired.
1542 */
1543
1544 JNIEXPORT jint JNICALL
1545 NET_Wait(JNIEnv *env, jint fd, jint flags, jint timeout)
1546 {
1547 jlong prevNanoTime = JVM_NanoTime(env, 0);
1548 jlong nanoTimeout = (jlong) timeout * NET_NSEC_PER_MSEC;
1549 jint read_rv;
1550
1551 while (1) {
1552 jlong newNanoTime;
1553 struct pollfd pfd;
1554 pfd.fd = fd;
1555 pfd.events = 0;
1556 if (flags & NET_WAIT_READ)
1557 pfd.events |= POLLIN;
1558 if (flags & NET_WAIT_WRITE)
1559 pfd.events |= POLLOUT;
1560 if (flags & NET_WAIT_CONNECT)
1561 pfd.events |= POLLOUT;
1562
1563 errno = 0;
1564 read_rv = NET_Poll(&pfd, 1, nanoTimeout / NET_NSEC_PER_MSEC);
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