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- /* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
- * Copyright 2011 Pierre Ossman for Cendio AB
- * Copyright 2017 Peter Astrand <astrand@cendio.se> for Cendio AB
- *
- * This is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This software 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 for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this software; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
- * USA.
- */
-
- #ifdef HAVE_CONFIG_H
- #include <config.h>
- #endif
-
- #include <stdio.h>
- #include <string.h>
- #include <errno.h>
- #ifdef _WIN32
- #include <winsock2.h>
- #undef errno
- #define errno WSAGetLastError()
- #include <os/winerrno.h>
- #else
- #include <sys/types.h>
- #include <unistd.h>
- #include <sys/time.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <netinet/tcp.h>
- #endif
-
- /* Old systems have select() in sys/time.h */
- #ifdef HAVE_SYS_SELECT_H
- #include <sys/select.h>
- #endif
-
- #include <rdr/FdOutStream.h>
- #include <rdr/Exception.h>
- #include <rfb/util.h>
-
-
- using namespace rdr;
-
- FdOutStream::FdOutStream(int fd_)
- : BufferedOutStream(false), fd(fd_)
- {
- gettimeofday(&lastWrite, NULL);
- }
-
- FdOutStream::~FdOutStream()
- {
- }
-
- unsigned FdOutStream::getIdleTime()
- {
- return rfb::msSince(&lastWrite);
- }
-
- void FdOutStream::cork(bool enable)
- {
- BufferedOutStream::cork(enable);
-
- #ifdef TCP_CORK
- int one = enable ? 1 : 0;
- setsockopt(fd, IPPROTO_TCP, TCP_CORK, (char *)&one, sizeof(one));
- #endif
- }
-
- bool FdOutStream::flushBuffer()
- {
- size_t n = writeFd((const void*) sentUpTo, ptr - sentUpTo);
- if (n == 0)
- return false;
-
- sentUpTo += n;
-
- return true;
- }
-
- //
- // writeFd() writes up to the given length in bytes from the given
- // buffer to the file descriptor. It returns the number of bytes written. It
- // never attempts to send() unless select() indicates that the fd is writable
- // - this means it can be used on an fd which has been set non-blocking. It
- // also has to cope with the annoying possibility of both select() and send()
- // returning EINTR.
- //
-
- size_t FdOutStream::writeFd(const void* data, size_t length)
- {
- int n;
-
- do {
- fd_set fds;
- struct timeval tv;
-
- tv.tv_sec = tv.tv_usec = 0;
-
- FD_ZERO(&fds);
- FD_SET(fd, &fds);
- n = select(fd+1, 0, &fds, 0, &tv);
- } while (n < 0 && errno == EINTR);
-
- if (n < 0)
- throw SystemException("select", errno);
-
- if (n == 0)
- return 0;
-
- do {
- // select only guarantees that you can write SO_SNDLOWAT without
- // blocking, which is normally 1. Use MSG_DONTWAIT to avoid
- // blocking, when possible.
- #ifndef MSG_DONTWAIT
- n = ::send(fd, (const char*)data, length, 0);
- #else
- n = ::send(fd, (const char*)data, length, MSG_DONTWAIT);
- #endif
- } while (n < 0 && (errno == EINTR));
-
- if (n < 0)
- throw SystemException("write", errno);
-
- gettimeofday(&lastWrite, NULL);
-
- return n;
- }
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