static void
WrapNotify(
ClientData clientData,
int mask)
{
TcpState *statePtr = (TcpState *) clientData;
int newmask = mask & statePtr->interest;
if (newmask == 0) {
/*
* There was no overlap between the states the channel is
* interested in notifications for, and the states that are
* reported present on the file descriptor by select(). The
* only way that can happen is when the channel is interested
* in a writable condition, and only a readable state is reported
* present (see TcpWatchProc() below). In that case, signal back
* to the caller the writable state, which is really an error
* condition. As an extra check on that assumption, check for
* a non-zero value of errno before reporting an artificial
* writable state.
*/
if (errno == 0) {
return;
}
newmask = TCL_WRITABLE;
}
Tcl_NotifyChannel(statePtr->channel, newmask);
}
static void
rcTimerProc (ClientData cd_)
{
ReflectingChannel* chan = (ReflectingChannel*) cd_;
if (chan->_timer != NULL)
Tcl_DeleteTimerHandler(chan->_timer);
chan->_timer = NULL;
Tcl_NotifyChannel(chan->_chan, chan->_watchMask);
}
static void
TransformChannelHandlerTimer(
ClientData clientData) /* Transformation to query. */
{
TransformChannelData *dataPtr = clientData;
dataPtr->timer = NULL;
if (!(dataPtr->watchMask&TCL_READABLE) || ResultEmpty(&dataPtr->result)) {
/*
* The timer fired, but either is there no (more) interest in the
* events it generates or nothing is available for reading, so ignore
* it and don't recreate it.
*/
return;
}
Tcl_NotifyChannel(dataPtr->self, TCL_READABLE);
}
static int
TcpConnect(
Tcl_Interp *interp, /* For error reporting; can be NULL. */
TcpState *statePtr)
{
socklen_t optlen;
int async_callback = statePtr->flags & TCP_ASYNC_PENDING;
int ret = -1, error = errno;
int async = statePtr->flags & TCP_ASYNC_CONNECT;
if (async_callback) {
goto reenter;
}
for (statePtr->addr = statePtr->addrlist; statePtr->addr != NULL;
statePtr->addr = statePtr->addr->ai_next) {
for (statePtr->myaddr = statePtr->myaddrlist; statePtr->myaddr != NULL;
statePtr->myaddr = statePtr->myaddr->ai_next) {
int reuseaddr = 1;
/*
* No need to try combinations of local and remote addresses of
* different families.
*/
if (statePtr->myaddr->ai_family != statePtr->addr->ai_family) {
continue;
}
/*
* Close the socket if it is still open from the last unsuccessful
* iteration.
*/
if (statePtr->fds.fd >= 0) {
close(statePtr->fds.fd);
statePtr->fds.fd = -1;
errno = 0;
}
statePtr->fds.fd = socket(statePtr->addr->ai_family, SOCK_STREAM, 0);
if (statePtr->fds.fd < 0) {
continue;
}
/*
* Set the close-on-exec flag so that the socket will not get
* inherited by child processes.
*/
fcntl(statePtr->fds.fd, F_SETFD, FD_CLOEXEC);
/*
* Set kernel space buffering
*/
TclSockMinimumBuffers(INT2PTR(statePtr->fds.fd), SOCKET_BUFSIZE);
if (async) {
ret = TclUnixSetBlockingMode(statePtr->fds.fd,TCL_MODE_NONBLOCKING);
if (ret < 0) {
continue;
}
}
/* Gotta reset the error variable here, before we use it for the
* first time in this iteration. */
error = 0;
(void) setsockopt(statePtr->fds.fd, SOL_SOCKET, SO_REUSEADDR,
(char *) &reuseaddr, sizeof(reuseaddr));
ret = bind(statePtr->fds.fd, statePtr->myaddr->ai_addr,
statePtr->myaddr->ai_addrlen);
if (ret < 0) {
error = errno;
continue;
}
/*
* Attempt to connect. The connect may fail at present with an
* EINPROGRESS but at a later time it will complete. The caller
* will set up a file handler on the socket if she is interested
* in being informed when the connect completes.
*/
ret = connect(statePtr->fds.fd, statePtr->addr->ai_addr,
statePtr->addr->ai_addrlen);
if (ret < 0) error = errno;
if (ret < 0 && errno == EINPROGRESS) {
Tcl_CreateFileHandler(statePtr->fds.fd,
TCL_WRITABLE|TCL_EXCEPTION, TcpAsyncCallback, statePtr);
errno = EWOULDBLOCK;
SET_BITS(statePtr->flags, TCP_ASYNC_PENDING);
return TCL_OK;
reenter:
CLEAR_BITS(statePtr->flags, TCP_ASYNC_PENDING);
Tcl_DeleteFileHandler(statePtr->fds.fd);
/*
* Read the error state from the socket to see if the async
* connection has succeeded or failed. As this clears the
* error condition, we cache the status in the socket state
* struct for later retrieval by [fconfigure -error].
*/
optlen = sizeof(int);
getsockopt(statePtr->fds.fd, SOL_SOCKET, SO_ERROR,
(char *) &error, &optlen);
errno = error;
}
if (error == 0) {
goto out;
}
}
}
out:
statePtr->connectError = error;
CLEAR_BITS(statePtr->flags, TCP_ASYNC_CONNECT);
if (async_callback) {
/*
* An asynchonous connection has finally succeeded or failed.
*/
TcpWatchProc(statePtr, statePtr->filehandlers);
TclUnixSetBlockingMode(statePtr->fds.fd, statePtr->cachedBlocking);
if (error != 0) {
SET_BITS(statePtr->flags, TCP_ASYNC_FAILED);
}
/*
* We need to forward the writable event that brought us here, bcasue
* upon reading of getsockopt(SO_ERROR), at least some OSes clear the
* writable state from the socket, and so a subsequent select() on
* behalf of a script level [fileevent] would not fire. It doesn't
* hurt that this is also called in the successful case and will save
* the event mechanism one roundtrip through select().
*/
if (statePtr->cachedBlocking == TCL_MODE_NONBLOCKING) {
Tcl_NotifyChannel(statePtr->channel, TCL_WRITABLE);
}
}
if (error != 0) {
/*
* Failure for either a synchronous connection, or an async one that
* failed before it could enter background mode, e.g. because an
* invalid -myaddr was given.
*/
if (interp != NULL) {
errno = error;
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"couldn't open socket: %s", Tcl_PosixError(interp)));
}
return TCL_ERROR;
}
return TCL_OK;
}
static int
ConsoleEventProc(
Tcl_Event *evPtr, /* Event to service. */
int flags) /* Flags that indicate what events to handle,
* such as TCL_FILE_EVENTS. */
{
ConsoleEvent *consoleEvPtr = (ConsoleEvent *)evPtr;
ConsoleInfo *infoPtr;
int mask;
ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
if (!(flags & TCL_FILE_EVENTS)) {
return 0;
}
/*
* Search through the list of watched consoles for the one whose handle
* matches the event. We do this rather than simply dereferencing the
* handle in the event so that consoles can be deleted while the event is
* in the queue.
*/
for (infoPtr = tsdPtr->firstConsolePtr; infoPtr != NULL;
infoPtr = infoPtr->nextPtr) {
if (consoleEvPtr->infoPtr == infoPtr) {
infoPtr->flags &= ~(CONSOLE_PENDING);
break;
}
}
/*
* Remove stale events.
*/
if (!infoPtr) {
return 1;
}
/*
* Check to see if the console is readable. Note that we can't tell if a
* console is writable, so we always report it as being writable unless we
* have detected EOF.
*/
mask = 0;
if (infoPtr->watchMask & TCL_WRITABLE) {
if (WaitForSingleObject(infoPtr->writable, 0) != WAIT_TIMEOUT) {
mask = TCL_WRITABLE;
}
}
if (infoPtr->watchMask & TCL_READABLE) {
if (WaitForRead(infoPtr, 0) >= 0) {
if (infoPtr->readFlags & CONSOLE_EOF) {
mask = TCL_READABLE;
} else {
mask |= TCL_READABLE;
}
}
}
/*
* Inform the channel of the events.
*/
Tcl_NotifyChannel(infoPtr->channel, infoPtr->watchMask & mask);
return 1;
}
