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/*****************************************************************************
$Id$
File: ed.cpp
Date: 06Apr06
Copyright (C) 2006-07 by Francis Cianfrocca. All Rights Reserved.
Gmail: blackhedd
This program is free software; you can redistribute it and/or modify
it under the terms of either: 1) 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; or 2) Ruby's License.
See the file COPYING for complete licensing information.
*****************************************************************************/
#include "project.h"
/********************
SetSocketNonblocking
********************/
bool SetSocketNonblocking (SOCKET sd)
{
#ifdef OS_UNIX
int val = fcntl (sd, F_GETFL, 0);
return (fcntl (sd, F_SETFL, val | O_NONBLOCK) != SOCKET_ERROR) ? true : false;
#endif
#ifdef OS_WIN32
#ifdef BUILD_FOR_RUBY
// 14Jun09 Ruby provides its own wrappers for ioctlsocket. On 1.8 this is a simple wrapper,
// however, 1.9 keeps its own state about the socket.
// NOTE: F_GETFL is not supported
return (fcntl (sd, F_SETFL, O_NONBLOCK) == 0) ? true : false;
#else
unsigned long one = 1;
return (ioctlsocket (sd, FIONBIO, &one) == 0) ? true : false;
#endif
#endif
}
/****************************************
EventableDescriptor::EventableDescriptor
****************************************/
EventableDescriptor::EventableDescriptor (int sd, EventMachine_t *em):
bCloseNow (false),
bCloseAfterWriting (false),
MySocket (sd),
EventCallback (NULL),
bCallbackUnbind (true),
UnbindReasonCode (0),
ProxyTarget(NULL),
ProxiedFrom(NULL),
MaxOutboundBufSize(0),
MyEventMachine (em),
PendingConnectTimeout(20000000),
InactivityTimeout (0)
{
/* There are three ways to close a socket, all of which should
* automatically signal to the event machine that this object
* should be removed from the polling scheduler.
* First is a hard close, intended for bad errors or possible
* security violations. It immediately closes the connection
* and puts this object into an error state.
* Second is to set bCloseNow, which will cause the event machine
* to delete this object (and thus close the connection in our
* destructor) the next chance it gets. bCloseNow also inhibits
* the writing of new data on the socket (but not necessarily
* the reading of new data).
* The third way is to set bCloseAfterWriting, which inhibits
* the writing of new data and converts to bCloseNow as soon
* as everything in the outbound queue has been written.
* bCloseAfterWriting is really for use only by protocol handlers
* (for example, HTTP writes an HTML page and then closes the
* connection). All of the error states we generate internally
* cause an immediate close to be scheduled, which may have the
* effect of discarding outbound data.
*/
if (sd == INVALID_SOCKET)
throw std::runtime_error ("bad eventable descriptor");
if (MyEventMachine == NULL)
throw std::runtime_error ("bad em in eventable descriptor");
CreatedAt = MyEventMachine->GetCurrentLoopTime();
#ifdef HAVE_EPOLL
EpollEvent.events = 0;
EpollEvent.data.ptr = this;
#endif
LastActivity = MyEventMachine->GetCurrentLoopTime();
}
/*****************************************
EventableDescriptor::~EventableDescriptor
*****************************************/
EventableDescriptor::~EventableDescriptor()
{
if (NextHeartbeat)
MyEventMachine->ClearHeartbeat(NextHeartbeat);
if (EventCallback && bCallbackUnbind)
(*EventCallback)(GetBinding(), EM_CONNECTION_UNBOUND, NULL, UnbindReasonCode);
if (ProxiedFrom) {
(*EventCallback)(ProxiedFrom->GetBinding(), EM_PROXY_TARGET_UNBOUND, NULL, 0);
ProxiedFrom->StopProxy();
}
StopProxy();
Close();
}
/*************************************
EventableDescriptor::SetEventCallback
*************************************/
void EventableDescriptor::SetEventCallback (EMCallback cb)
{
EventCallback = cb;
}
/**************************
EventableDescriptor::Close
**************************/
void EventableDescriptor::Close()
{
// Close the socket right now. Intended for emergencies.
if (MySocket != INVALID_SOCKET) {
shutdown (MySocket, 1);
closesocket (MySocket);
MySocket = INVALID_SOCKET;
}
}
/*********************************
EventableDescriptor::ShouldDelete
*********************************/
bool EventableDescriptor::ShouldDelete()
{
/* For use by a socket manager, which needs to know if this object
* should be removed from scheduling events and deleted.
* Has an immediate close been scheduled, or are we already closed?
* If either of these are the case, return true. In theory, the manager will
* then delete us, which in turn will make sure the socket is closed.
* Note, if bCloseAfterWriting is true, we check a virtual method to see
* if there is outbound data to write, and only request a close if there is none.
*/
return ((MySocket == INVALID_SOCKET) || bCloseNow || (bCloseAfterWriting && (GetOutboundDataSize() <= 0)));
}
/**********************************
EventableDescriptor::ScheduleClose
**********************************/
void EventableDescriptor::ScheduleClose (bool after_writing)
{
// KEEP THIS SYNCHRONIZED WITH ::IsCloseScheduled.
if (after_writing)
bCloseAfterWriting = true;
else
bCloseNow = true;
}
/*************************************
EventableDescriptor::IsCloseScheduled
*************************************/
bool EventableDescriptor::IsCloseScheduled()
{
// KEEP THIS SYNCHRONIZED WITH ::ScheduleClose.
return (bCloseNow || bCloseAfterWriting);
}
/*******************************
EventableDescriptor::StartProxy
*******************************/
void EventableDescriptor::StartProxy(const unsigned long to, const unsigned long bufsize, const unsigned long length)
{
EventableDescriptor *ed = dynamic_cast <EventableDescriptor*> (Bindable_t::GetObject (to));
if (ed) {
StopProxy();
ProxyTarget = ed;
BytesToProxy = length;
ed->SetProxiedFrom(this, bufsize);
return;
}
throw std::runtime_error ("Tried to proxy to an invalid descriptor");
}
/******************************
EventableDescriptor::StopProxy
******************************/
void EventableDescriptor::StopProxy()
{
if (ProxyTarget) {
ProxyTarget->SetProxiedFrom(NULL, 0);
ProxyTarget = NULL;
}
}
/***********************************
EventableDescriptor::SetProxiedFrom
***********************************/
void EventableDescriptor::SetProxiedFrom(EventableDescriptor *from, const unsigned long bufsize)
{
ProxiedFrom = from;
MaxOutboundBufSize = bufsize;
}
/********************************************
EventableDescriptor::_GenericInboundDispatch
********************************************/
void EventableDescriptor::_GenericInboundDispatch(const char *buf, int size)
{
assert(EventCallback);
if (ProxyTarget) {
if (BytesToProxy > 0) {
unsigned long proxied = std::min(BytesToProxy, (unsigned long) size);
ProxyTarget->SendOutboundData(buf, proxied);
BytesToProxy -= proxied;
if (BytesToProxy == 0) {
StopProxy();
(*EventCallback)(GetBinding(), EM_PROXY_COMPLETED, NULL, 0);
if (proxied < size) {
(*EventCallback)(GetBinding(), EM_CONNECTION_READ, buf + proxied, size - proxied);
}
}
} else {
ProxyTarget->SendOutboundData(buf, size);
}
} else {
(*EventCallback)(GetBinding(), EM_CONNECTION_READ, buf, size);
}
}
/*********************************************
EventableDescriptor::GetPendingConnectTimeout
*********************************************/
uint64_t EventableDescriptor::GetPendingConnectTimeout()
{
return PendingConnectTimeout / 1000;
}
/*********************************************
EventableDescriptor::SetPendingConnectTimeout
*********************************************/
int EventableDescriptor::SetPendingConnectTimeout (uint64_t value)
{
if (value > 0) {
PendingConnectTimeout = value * 1000;
MyEventMachine->QueueHeartbeat(this);
return 1;
}
return 0;
}
/*************************************
EventableDescriptor::GetNextHeartbeat
*************************************/
uint64_t EventableDescriptor::GetNextHeartbeat()
{
if (NextHeartbeat)
MyEventMachine->ClearHeartbeat(NextHeartbeat);
NextHeartbeat = 0;
if (!ShouldDelete()) {
uint64_t time_til_next = GetCommInactivityTimeout() * 1000;
if (IsConnectPending()) {
if (time_til_next == 0 || PendingConnectTimeout < time_til_next)
time_til_next = PendingConnectTimeout;
}
if (time_til_next == 0)
return 0;
NextHeartbeat = time_til_next + MyEventMachine->GetRealTime();
}
return NextHeartbeat;
}
/******************************************
ConnectionDescriptor::ConnectionDescriptor
******************************************/
ConnectionDescriptor::ConnectionDescriptor (int sd, EventMachine_t *em):
EventableDescriptor (sd, em),
bPaused (false),
bConnectPending (false),
bNotifyReadable (false),
bNotifyWritable (false),
bWatchOnly (false),
bReadAttemptedAfterClose (false),
bWriteAttemptedAfterClose (false),
OutboundDataSize (0),
#ifdef WITH_SSL
SslBox (NULL),
bHandshakeSignaled (false),
bSslVerifyPeer (false),
bSslPeerAccepted(false),
#endif
#ifdef HAVE_KQUEUE
bGotExtraKqueueEvent(false),
#endif
bIsServer (false)
{
// 22Jan09: Moved ArmKqueueWriter into SetConnectPending() to fix assertion failure in _WriteOutboundData()
// 5May09: Moved EPOLLOUT into SetConnectPending() so it doesn't happen for attached read pipes
}
/*******************************************
ConnectionDescriptor::~ConnectionDescriptor
*******************************************/
ConnectionDescriptor::~ConnectionDescriptor()
{
// Run down any stranded outbound data.
for (size_t i=0; i < OutboundPages.size(); i++)
OutboundPages[i].Free();
#ifdef WITH_SSL
if (SslBox)
delete SslBox;
#endif
}
/***********************************
ConnectionDescriptor::_UpdateEvents
************************************/
void ConnectionDescriptor::_UpdateEvents()
{
_UpdateEvents(true, true);
}
void ConnectionDescriptor::_UpdateEvents(bool read, bool write)
{
if (MySocket == INVALID_SOCKET)
return;
#ifdef HAVE_EPOLL
unsigned int old = EpollEvent.events;
if (read) {
if (SelectForRead())
EpollEvent.events |= EPOLLIN;
else
EpollEvent.events &= ~EPOLLIN;
}
if (write) {
if (SelectForWrite())
EpollEvent.events |= EPOLLOUT;
else
EpollEvent.events &= ~EPOLLOUT;
}
if (old != EpollEvent.events)
MyEventMachine->Modify (this);
#endif
#ifdef HAVE_KQUEUE
if (read && SelectForRead())
MyEventMachine->ArmKqueueReader (this);
if (write && SelectForWrite())
MyEventMachine->ArmKqueueWriter (this);
#endif
}
/***************************************
ConnectionDescriptor::SetConnectPending
****************************************/
void ConnectionDescriptor::SetConnectPending(bool f)
{
bConnectPending = f;
_UpdateEvents();
}
/**********************************
ConnectionDescriptor::SetWatchOnly
***********************************/
void ConnectionDescriptor::SetWatchOnly(bool watching)
{
bWatchOnly = watching;
_UpdateEvents();
}
/*********************************
ConnectionDescriptor::HandleError
*********************************/
void ConnectionDescriptor::HandleError()
{
if (bWatchOnly) {
// An EPOLLHUP | EPOLLIN condition will call Read() before HandleError(), in which case the
// socket is already detached and invalid, so we don't need to do anything.
if (MySocket == INVALID_SOCKET) return;
// HandleError() is called on WatchOnly descriptors by the epoll reactor
// when it gets a EPOLLERR | EPOLLHUP. Usually this would show up as a readable and
// writable event on other reactors, so we have to fire those events ourselves.
if (bNotifyReadable) Read();
if (bNotifyWritable) Write();
} else {
ScheduleClose (false);
}
}
/***********************************
ConnectionDescriptor::ScheduleClose
***********************************/
void ConnectionDescriptor::ScheduleClose (bool after_writing)
{
if (bWatchOnly)
throw std::runtime_error ("cannot close 'watch only' connections");
EventableDescriptor::ScheduleClose(after_writing);
}
/***************************************
ConnectionDescriptor::SetNotifyReadable
****************************************/
void ConnectionDescriptor::SetNotifyReadable(bool readable)
{
if (!bWatchOnly)
throw std::runtime_error ("notify_readable must be on 'watch only' connections");
bNotifyReadable = readable;
_UpdateEvents(true, false);
}
/***************************************
ConnectionDescriptor::SetNotifyWritable
****************************************/
void ConnectionDescriptor::SetNotifyWritable(bool writable)
{
if (!bWatchOnly)
throw std::runtime_error ("notify_writable must be on 'watch only' connections");
bNotifyWritable = writable;
_UpdateEvents(false, true);
}
/**************************************
ConnectionDescriptor::SendOutboundData
**************************************/
int ConnectionDescriptor::SendOutboundData (const char *data, int length)
{
if (bWatchOnly)
throw std::runtime_error ("cannot send data on a 'watch only' connection");
if (ProxiedFrom && MaxOutboundBufSize && (unsigned int)(GetOutboundDataSize() + length) > MaxOutboundBufSize)
ProxiedFrom->Pause();
#ifdef WITH_SSL
if (SslBox) {
if (length > 0) {
int w = SslBox->PutPlaintext (data, length);
if (w < 0)
ScheduleClose (false);
else
_DispatchCiphertext();
}
// TODO: What's the correct return value?
return 1; // That's a wild guess, almost certainly wrong.
}
else
#endif
return _SendRawOutboundData (data, length);
}
/******************************************
ConnectionDescriptor::_SendRawOutboundData
******************************************/
int ConnectionDescriptor::_SendRawOutboundData (const char *data, int length)
{
/* This internal method is called to schedule bytes that
* will be sent out to the remote peer.
* It's not directly accessed by the caller, who hits ::SendOutboundData,
* which may or may not filter or encrypt the caller's data before
* sending it here.
*/
// Highly naive and incomplete implementation.
// There's no throttle for runaways (which should abort only this connection
// and not the whole process), and no coalescing of small pages.
// (Well, not so bad, small pages are coalesced in ::Write)
if (IsCloseScheduled())
return 0;
// 25Mar10: Ignore 0 length packets as they are not meaningful in TCP (as opposed to UDP)
// and can cause the assert(nbytes>0) to fail when OutboundPages has a bunch of 0 length pages.
if (length == 0)
return 0;
if (!data && (length > 0))
throw std::runtime_error ("bad outbound data");
char *buffer = (char *) malloc (length + 1);
if (!buffer)
throw std::runtime_error ("no allocation for outbound data");
memcpy (buffer, data, length);
buffer [length] = 0;
OutboundPages.push_back (OutboundPage (buffer, length));
OutboundDataSize += length;
_UpdateEvents(false, true);
return length;
}
/***********************************
ConnectionDescriptor::SelectForRead
***********************************/
bool ConnectionDescriptor::SelectForRead()
{
/* A connection descriptor is always scheduled for read,
* UNLESS it's in a pending-connect state.
* On Linux, unlike Unix, a nonblocking socket on which
* connect has been called, does NOT necessarily select
* both readable and writable in case of error.
* The socket will select writable when the disposition
* of the connect is known. On the other hand, a socket
* which successfully connects and selects writable may
* indeed have some data available on it, so it will
* select readable in that case, violating expectations!
* So we will not poll for readability until the socket
* is known to be in a connected state.
*/
if (bPaused)
return false;
else if (bConnectPending)
return false;
else if (bWatchOnly)
return bNotifyReadable ? true : false;
else
return true;
}
/************************************
ConnectionDescriptor::SelectForWrite
************************************/
bool ConnectionDescriptor::SelectForWrite()
{
/* Cf the notes under SelectForRead.
* In a pending-connect state, we ALWAYS select for writable.
* In a normal state, we only select for writable when we
* have outgoing data to send.
*/
if (bPaused)
return false;
else if (bConnectPending)
return true;
else if (bWatchOnly)
return bNotifyWritable ? true : false;
else
return (GetOutboundDataSize() > 0);
}
/***************************
ConnectionDescriptor::Pause
***************************/
bool ConnectionDescriptor::Pause()
{
if (bWatchOnly)
throw std::runtime_error ("cannot pause/resume 'watch only' connections, set notify readable/writable instead");
bool old = bPaused;
bPaused = true;
_UpdateEvents();
return old == false;
}
/****************************
ConnectionDescriptor::Resume
****************************/
bool ConnectionDescriptor::Resume()
{
if (bWatchOnly)
throw std::runtime_error ("cannot pause/resume 'watch only' connections, set notify readable/writable instead");
bool old = bPaused;
bPaused = false;
_UpdateEvents();
return old == true;
}
/**************************
ConnectionDescriptor::Read
**************************/
void ConnectionDescriptor::Read()
{
/* Read and dispatch data on a socket that has selected readable.
* It's theoretically possible to get and dispatch incoming data on
* a socket that has already been scheduled for closing or close-after-writing.
* In those cases, we'll leave it up the to protocol handler to "do the
* right thing" (which probably means to ignore the incoming data).
*
* 22Aug06: Chris Ochs reports that on FreeBSD, it's possible to come
* here with the socket already closed, after the process receives
* a ctrl-C signal (not sure if that's TERM or INT on BSD). The application
* was one in which network connections were doing a lot of interleaved reads
* and writes.
* Since we always write before reading (in order to keep the outbound queues
* as light as possible), I think what happened is that an interrupt caused
* the socket to be closed in ConnectionDescriptor::Write. We'll then
* come here in the same pass through the main event loop, and won't get
* cleaned up until immediately after.
* We originally asserted that the socket was valid when we got here.
* To deal properly with the possibility that we are closed when we get here,
* I removed the assert. HOWEVER, the potential for an infinite loop scares me,
* so even though this is really clunky, I added a flag to assert that we never
* come here more than once after being closed. (FCianfrocca)
*/
int sd = GetSocket();
//assert (sd != INVALID_SOCKET); (original, removed 22Aug06)
if (sd == INVALID_SOCKET) {
assert (!bReadAttemptedAfterClose);
bReadAttemptedAfterClose = true;
return;
}
if (bWatchOnly) {
if (bNotifyReadable && EventCallback)
(*EventCallback)(GetBinding(), EM_CONNECTION_NOTIFY_READABLE, NULL, 0);
return;
}
LastActivity = MyEventMachine->GetCurrentLoopTime();
int total_bytes_read = 0;
char readbuffer [16 * 1024 + 1];
for (int i=0; i < 10; i++) {
// Don't read just one buffer and then move on. This is faster
// if there is a lot of incoming.
// But don't read indefinitely. Give other sockets a chance to run.
// NOTICE, we're reading one less than the buffer size.
// That's so we can put a guard byte at the end of what we send
// to user code.
int r = read (sd, readbuffer, sizeof(readbuffer) - 1);
//cerr << "<R:" << r << ">";
if (r > 0) {
total_bytes_read += r;
// Add a null-terminator at the the end of the buffer
// that we will send to the callback.
// DO NOT EVER CHANGE THIS. We want to explicitly allow users
// to be able to depend on this behavior, so they will have
// the option to do some things faster. Additionally it's
// a security guard against buffer overflows.
readbuffer [r] = 0;
_DispatchInboundData (readbuffer, r);
}
else if (r == 0) {
break;
}
else {
// Basically a would-block, meaning we've read everything there is to read.
break;
}
}
if (total_bytes_read == 0) {
// If we read no data on a socket that selected readable,
// it generally means the other end closed the connection gracefully.
ScheduleClose (false);
//bCloseNow = true;
}
}
/******************************************
ConnectionDescriptor::_DispatchInboundData
******************************************/
void ConnectionDescriptor::_DispatchInboundData (const char *buffer, int size)
{
#ifdef WITH_SSL
if (SslBox) {
SslBox->PutCiphertext (buffer, size);
int s;
char B [2048];
while ((s = SslBox->GetPlaintext (B, sizeof(B) - 1)) > 0) {
_CheckHandshakeStatus();
B [s] = 0;
_GenericInboundDispatch(B, s);
}
// If our SSL handshake had a problem, shut down the connection.
if (s == -2) {
ScheduleClose(false);
return;
}
_CheckHandshakeStatus();
_DispatchCiphertext();
}
else {
_GenericInboundDispatch(buffer, size);
}
#endif
#ifdef WITHOUT_SSL
_GenericInboundDispatch(buffer, size);
#endif
}
/*******************************************
ConnectionDescriptor::_CheckHandshakeStatus
*******************************************/
void ConnectionDescriptor::_CheckHandshakeStatus()
{
#ifdef WITH_SSL
if (SslBox && (!bHandshakeSignaled) && SslBox->IsHandshakeCompleted()) {
bHandshakeSignaled = true;
if (EventCallback)
(*EventCallback)(GetBinding(), EM_SSL_HANDSHAKE_COMPLETED, NULL, 0);
}
#endif
}
/***************************
ConnectionDescriptor::Write
***************************/
void ConnectionDescriptor::Write()
{
/* A socket which is in a pending-connect state will select
* writable when the disposition of the connect is known.
* At that point, check to be sure there are no errors,
* and if none, then promote the socket out of the pending
* state.
* TODO: I haven't figured out how Windows signals errors on
* unconnected sockets. Maybe it does the untraditional but
* logical thing and makes the socket selectable for error.
* If so, it's unsupported here for the time being, and connect
* errors will have to be caught by the timeout mechanism.
*/
if (bConnectPending) {
int error;
socklen_t len;
len = sizeof(error);
#ifdef OS_UNIX
int o = getsockopt (GetSocket(), SOL_SOCKET, SO_ERROR, &error, &len);
#endif
#ifdef OS_WIN32
int o = getsockopt (GetSocket(), SOL_SOCKET, SO_ERROR, (char*)&error, &len);
#endif
if ((o == 0) && (error == 0)) {
if (EventCallback)
(*EventCallback)(GetBinding(), EM_CONNECTION_COMPLETED, "", 0);
// 5May09: Moved epoll/kqueue read/write arming into SetConnectPending, so it can be called
// from EventMachine_t::AttachFD as well.
SetConnectPending (false);
}
else
ScheduleClose (false);
//bCloseNow = true;
}
else {
if (bNotifyWritable) {
if (EventCallback)
(*EventCallback)(GetBinding(), EM_CONNECTION_NOTIFY_WRITABLE, NULL, 0);
_UpdateEvents(false, true);
return;
}
assert(!bWatchOnly);
/* 5May09: Kqueue bugs on OSX cause one extra writable event to fire even though we're using
EV_ONESHOT. We ignore this extra event once, but only the first time. If it happens again,
we should fall through to the assert(nbytes>0) failure to catch any EM bugs which might cause
::Write to be called in a busy-loop.
*/
#ifdef HAVE_KQUEUE
if (MyEventMachine->UsingKqueue()) {
if (OutboundDataSize == 0 && !bGotExtraKqueueEvent) {
bGotExtraKqueueEvent = true;
return;
} else if (OutboundDataSize > 0) {
bGotExtraKqueueEvent = false;
}
}
#endif
_WriteOutboundData();
}
}
/****************************************
ConnectionDescriptor::_WriteOutboundData
****************************************/
void ConnectionDescriptor::_WriteOutboundData()
{
/* This is a helper function called by ::Write.
* It's possible for a socket to select writable and then no longer
* be writable by the time we get around to writing. The kernel might
* have used up its available output buffers between the select call
* and when we get here. So this condition is not an error.
*
* 20Jul07, added the same kind of protection against an invalid socket
* that is at the top of ::Read. Not entirely how this could happen in
* real life (connection-reset from the remote peer, perhaps?), but I'm
* doing it to address some reports of crashing under heavy loads.
*/
int sd = GetSocket();
//assert (sd != INVALID_SOCKET);
if (sd == INVALID_SOCKET) {
assert (!bWriteAttemptedAfterClose);
bWriteAttemptedAfterClose = true;
return;
}
LastActivity = MyEventMachine->GetCurrentLoopTime();
size_t nbytes = 0;
#ifdef HAVE_WRITEV
int iovcnt = OutboundPages.size();
// Max of 16 outbound pages at a time
if (iovcnt > 16) iovcnt = 16;
#ifdef CC_SUNWspro
struct iovec iov[16];
#else
struct iovec iov[ iovcnt ];
#endif
for(int i = 0; i < iovcnt; i++){
OutboundPage *op = &(OutboundPages[i]);
#ifdef CC_SUNWspro
iov[i].iov_base = (char *)(op->Buffer + op->Offset);
#else
iov[i].iov_base = (void *)(op->Buffer + op->Offset);
#endif
iov[i].iov_len = op->Length - op->Offset;
nbytes += iov[i].iov_len;
}
#else
char output_buffer [16 * 1024];
while ((OutboundPages.size() > 0) && (nbytes < sizeof(output_buffer))) {
OutboundPage *op = &(OutboundPages[0]);
if ((nbytes + op->Length - op->Offset) < sizeof (output_buffer)) {
memcpy (output_buffer + nbytes, op->Buffer + op->Offset, op->Length - op->Offset);
nbytes += (op->Length - op->Offset);
op->Free();
OutboundPages.pop_front();
}
else {
int len = sizeof(output_buffer) - nbytes;
memcpy (output_buffer + nbytes, op->Buffer + op->Offset, len);
op->Offset += len;
nbytes += len;
}
}
#endif
// We should never have gotten here if there were no data to write,
// so assert that as a sanity check.
// Don't bother to make sure nbytes is less than output_buffer because
// if it were we probably would have crashed already.
assert (nbytes > 0);
assert (GetSocket() != INVALID_SOCKET);
#ifdef HAVE_WRITEV
int bytes_written = writev (GetSocket(), iov, iovcnt);
#else
int bytes_written = write (GetSocket(), output_buffer, nbytes);
#endif
bool err = false;
if (bytes_written < 0) {
err = true;
bytes_written = 0;
}
assert (bytes_written >= 0);
OutboundDataSize -= bytes_written;
if (ProxiedFrom && MaxOutboundBufSize && (unsigned int)GetOutboundDataSize() < MaxOutboundBufSize && ProxiedFrom->IsPaused())
ProxiedFrom->Resume();
#ifdef HAVE_WRITEV
if (!err) {
unsigned int sent = bytes_written;
deque<OutboundPage>::iterator op = OutboundPages.begin();
for (int i = 0; i < iovcnt; i++) {
if (iov[i].iov_len <= sent) {
// Sent this page in full, free it.
op->Free();
OutboundPages.pop_front();
sent -= iov[i].iov_len;
} else {
// Sent part (or none) of this page, increment offset to send the remainder
op->Offset += sent;
break;
}
// Shouldn't be possible run out of pages before the loop ends
assert(op != OutboundPages.end());
*op++;
}
}
#else
if ((size_t)bytes_written < nbytes) {
int len = nbytes - bytes_written;
char *buffer = (char*) malloc (len + 1);
if (!buffer)
throw std::runtime_error ("bad alloc throwing back data");
memcpy (buffer, output_buffer + bytes_written, len);
buffer [len] = 0;
OutboundPages.push_front (OutboundPage (buffer, len));
}
#endif
_UpdateEvents(false, true);