bool DoConnect()
{
sql = PQconnectStart(GetDSN().c_str());
if (!sql)
return false;
if(PQstatus(sql) == CONNECTION_BAD)
return false;
if(PQsetnonblocking(sql, 1) == -1)
return false;
/* OK, we've initalised the connection, now to get it hooked into the socket engine
* and then start polling it.
*/
this->fd = PQsocket(sql);
if(this->fd <= -1)
return false;
if (!ServerInstance->SE->AddFd(this, FD_WANT_NO_WRITE | FD_WANT_NO_READ))
{
ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "BUG: Couldn't add pgsql socket to socket engine");
return false;
}
/* Socket all hooked into the engine, now to tell PgSQL to start connecting */
return DoPoll();
}
bool wxEpollDispatcher::HasPending() const
{
epoll_event event;
// NB: it's not really clear if epoll_wait() can return a number greater
// than the number of events passed to it but just in case it can, use
// >= instead of == here, see #10397
return DoPoll(&event, 1, 0) >= 1;
}
void DoEvent()
{
if((status == CREAD) || (status == CWRITE))
{
DoPoll();
}
else if((status == RREAD) || (status == RWRITE))
{
DoResetPoll();
}
else
{
DoConnectedPoll();
}
}
bool DoEvent()
{
bool ret;
if((status == CREAD) || (status == CWRITE))
{
ret = DoPoll();
}
else if((status == RREAD) || (status == RWRITE))
{
ret = DoResetPoll();
}
else
{
ret = DoConnectedPoll();
}
return ret;
}
bool DoResetPoll()
{
switch(PQresetPoll(sql))
{
case PGRES_POLLING_WRITING:
ServerInstance->SE->WantWrite(this);
status = CWRITE;
return DoPoll();
case PGRES_POLLING_READING:
status = CREAD;
return true;
case PGRES_POLLING_FAILED:
return false;
case PGRES_POLLING_OK:
status = WWRITE;
return DoConnectedPoll();
default:
return true;
}
}
int wxEpollDispatcher::Dispatch(int timeout)
{
epoll_event events[16];
const int rc = DoPoll(events, WXSIZEOF(events), timeout);
if ( rc == -1 )
{
wxLogSysError(_("Waiting for IO on epoll descriptor %d failed"),
m_epollDescriptor);
return -1;
}
int numEvents = 0;
for ( epoll_event *p = events; p < events + rc; p++ )
{
wxFDIOHandler * const handler = (wxFDIOHandler *)(p->data.ptr);
if ( !handler )
{
wxFAIL_MSG( wxT("NULL handler in epoll_event?") );
continue;
}
// note that for compatibility with wxSelectDispatcher we call
// OnReadWaiting() on EPOLLHUP as this is what epoll_wait() returns
// when the write end of a pipe is closed while with select() the
// remaining pipe end becomes ready for reading when this happens
if ( p->events & (EPOLLIN | EPOLLHUP) )
handler->OnReadWaiting();
else if ( p->events & EPOLLOUT )
handler->OnWriteWaiting();
else if ( p->events & EPOLLERR )
handler->OnExceptionWaiting();
else
continue;
numEvents++;
}
return numEvents;
}
bool DoResetPoll()
{
switch(PQresetPoll(sql))
{
case PGRES_POLLING_WRITING:
ServerInstance->SE->ChangeEventMask(this, FD_WANT_POLL_WRITE | FD_WANT_NO_READ);
status = CWRITE;
return DoPoll();
case PGRES_POLLING_READING:
ServerInstance->SE->ChangeEventMask(this, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
status = CREAD;
return true;
case PGRES_POLLING_FAILED:
return false;
case PGRES_POLLING_OK:
ServerInstance->SE->ChangeEventMask(this, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
status = WWRITE;
DoConnectedPoll();
default:
return true;
}
}
int
PerformOperation(short port)
{
int acceptFd = 0;
struct sockaddr_in sin;
socklen_t sinlen = sizeof(sin);
int fd = 0;
int blocking = 1;
int reuseaddr = 1;
int devpoll = 0;
int pollresult = 0;
struct pollfd dp_fds[MAXSET];
struct dvpoll pollset;
int procClient = 0;
int i = 0;
/* create devpoll fd
*/
if ((devpoll = open("/dev/poll", O_RDWR)) == -1)
{
printf("devpoll can't be opened: %s(%d)\n", strerror(errno), errno);
exit(0);
}
/* create the accept socket
*/
acceptFd = socket(AF_INET, SOCK_STREAM, IPPROTO_IP);
if (acceptFd == -1)
{
/* Error creating accept fd
*/
printf("Error creating socket: %s\n", strerror(errno));
exit(0);
}
/* set socket opt to reuse address
*/
if (setsockopt(acceptFd, SOL_SOCKET, SO_REUSEADDR,
&reuseaddr, sizeof(reuseaddr)) == -1)
{
printf("Error w/ setsockopt: %s\n", strerror(errno));
close(acceptFd);
exit(0);
}
/* setup the accept fd as nonblocking
*/
if (ioctl(acceptFd, FIONBIO, &blocking) == -1)
{
/* error setting the nonblocking of fd
*/
printf("Error setting FIONBIO: %s\n", strerror(errno));
close(acceptFd);
exit(0);
}
/* bind the socket to the port
*/
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_port = htons(port);
sin.sin_addr.s_addr = INADDR_ANY;
if (bind(acceptFd, (struct sockaddr*)&sin, sizeof(sin))==-1)
{
printf("Error binding socket: %s\n", strerror(errno));
close(acceptFd);
exit(0);
}
/* setup the listen queue
*/
if (listen(acceptFd, 1) == -1)
{
printf("Error listening: %s\n", strerror(errno));
close(acceptFd);
exit(0);
}
/* Add to dev poll queue
*/
Add(devpoll, acceptFd);
while (1)
{
/* Get and service any active fd
*/
pollset.dp_fds = dp_fds;
pollset.dp_nfds = MAXSET;
pollset.dp_timeout = -1;
if ((pollresult = DoPoll(devpoll, &pollset)) == -1)
{
printf("Error w/ the polling: %s(%d)\n", strerror(errno), errno);
exit(0);
}
for (i = 0; i < pollresult; i++)
{
/* if accept then accept the conn and add it to the devpoll
*/
if (pollset.dp_fds[i].fd == acceptFd)
{
fd = Accept(acceptFd);
Add(devpoll, fd);
}
else
{
/* if a client fd then get the data and echo back
*/
procClient = ProcessClient(pollset.dp_fds[i].fd);
if (procClient == 0)
{
/* client closed conn remove it from devpoll
*/
Remove(devpoll, fd);
}
}
}
}
}