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https://github.com/kasmtech/KasmVNC.git
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d8caab699d
We didn't include the proper headers to get the correct define, so corking was never enabled.
157 lines
3.8 KiB
C++
157 lines
3.8 KiB
C++
/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
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* Copyright 2011 Pierre Ossman for Cendio AB
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* Copyright 2017 Peter Astrand <astrand@cendio.se> for Cendio AB
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#ifdef _WIN32
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#include <winsock2.h>
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#undef errno
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#define errno WSAGetLastError()
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#include <os/winerrno.h>
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#else
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#include <sys/types.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#endif
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/* Old systems have select() in sys/time.h */
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#ifdef HAVE_SYS_SELECT_H
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#include <sys/select.h>
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#endif
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#include <rdr/FdOutStream.h>
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#include <rdr/Exception.h>
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#include <rfb/util.h>
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using namespace rdr;
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FdOutStream::FdOutStream(int fd_, bool blocking_, int timeoutms_)
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: fd(fd_), blocking(blocking_), timeoutms(timeoutms_)
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{
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gettimeofday(&lastWrite, NULL);
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}
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FdOutStream::~FdOutStream()
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{
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try {
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while (sentUpTo != ptr)
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flushBuffer(true);
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} catch (Exception&) {
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}
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}
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void FdOutStream::setTimeout(int timeoutms_) {
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timeoutms = timeoutms_;
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}
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void FdOutStream::setBlocking(bool blocking_) {
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blocking = blocking_;
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}
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unsigned FdOutStream::getIdleTime()
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{
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return rfb::msSince(&lastWrite);
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}
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bool FdOutStream::flushBuffer(bool wait)
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{
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size_t n = writeWithTimeout((const void*) sentUpTo,
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ptr - sentUpTo,
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(blocking || wait)? timeoutms : 0);
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// Timeout?
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if (n == 0) {
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// If non-blocking then we're done here
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if (!blocking && !wait)
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return false;
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throw TimedOut();
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}
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sentUpTo += n;
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return true;
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}
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//
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// writeWithTimeout() writes up to the given length in bytes from the given
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// buffer to the file descriptor. If there is a timeout set and that timeout
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// expires, it throws a TimedOut exception. Otherwise it returns the number of
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// bytes written. It never attempts to send() unless select() indicates that
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// the fd is writable - this means it can be used on an fd which has been set
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// non-blocking. It also has to cope with the annoying possibility of both
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// select() and send() returning EINTR.
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//
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size_t FdOutStream::writeWithTimeout(const void* data, size_t length, int timeoutms)
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{
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int n;
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do {
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fd_set fds;
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struct timeval tv;
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struct timeval* tvp = &tv;
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if (timeoutms != -1) {
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tv.tv_sec = timeoutms / 1000;
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tv.tv_usec = (timeoutms % 1000) * 1000;
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} else {
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tvp = NULL;
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}
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FD_ZERO(&fds);
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FD_SET(fd, &fds);
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n = select(fd+1, 0, &fds, 0, tvp);
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} while (n < 0 && errno == EINTR);
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if (n < 0)
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throw SystemException("select", errno);
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if (n == 0)
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return 0;
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do {
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// select only guarantees that you can write SO_SNDLOWAT without
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// blocking, which is normally 1. Use MSG_DONTWAIT to avoid
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// blocking, when possible.
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#ifndef MSG_DONTWAIT
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n = ::send(fd, (const char*)data, length, 0);
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#else
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n = ::send(fd, (const char*)data, length, MSG_DONTWAIT);
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#endif
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} while (n < 0 && (errno == EINTR));
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if (n < 0)
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throw SystemException("write", errno);
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gettimeofday(&lastWrite, NULL);
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return n;
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}
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