* to re-create a select() function with support for other handle types.
*
* select() function with support for WINSOCK2 sockets and all
- * other handle types supported by WaitForMultipleObjectsEx().
- *
- * TODO: Differentiate between read/write/except for non-SOCKET handles.
+ * other handle types supported by WaitForMultipleObjectsEx() as
+ * well as disk files, anonymous and names pipes, and character input.
*
* http://msdn.microsoft.com/en-us/library/windows/desktop/ms687028.aspx
* http://msdn.microsoft.com/en-us/library/windows/desktop/ms741572.aspx
*/
-static DWORD WINAPI select_ws_stdin_wait_thread(LPVOID lpParameter)
+struct select_ws_wait_data {
+ HANDLE handle; /* actual handle to wait for during select */
+ HANDLE event; /* internal event to abort waiting thread */
+};
+static DWORD WINAPI select_ws_wait_thread(LPVOID lpParameter)
{
+ struct select_ws_wait_data *data;
HANDLE handle, handles[2];
INPUT_RECORD inputrecord;
LARGE_INTEGER size, pos;
DWORD type, length;
- handle = GetStdHandle(STD_INPUT_HANDLE);
- handles[0] = (HANDLE) lpParameter;
- handles[1] = handle;
- type = GetFileType(handle);
+ /* retrieve handles from internal structure */
+ data = (struct select_ws_wait_data *) lpParameter;
+ if(data) {
+ handle = data->handle;
+ handles[0] = data->event;
+ handles[1] = handle;
+ free(data);
+ }
+ else
+ return -1;
+ /* retrieve the type of file to wait on */
+ type = GetFileType(handle);
switch(type) {
case FILE_TYPE_DISK:
+ /* The handle represents a file on disk, this means:
+ * - WaitForMultipleObjectsEx will always be signalled for it.
+ * - comparison of current position in file and total size of
+ * the file can be used to check if we reached the end yet.
+ *
+ * Approach: Loop till either the internal event is signalled
+ * or if the end of the file has already been reached.
+ */
while(WaitForMultipleObjectsEx(2, handles, FALSE, INFINITE, FALSE)
== WAIT_OBJECT_0 + 1) {
+ /* get total size of file */
size.QuadPart = 0;
if(GetFileSizeEx(handle, &size)) {
+ /* get the current position within the file */
pos.QuadPart = 0;
if(SetFilePointerEx(handle, pos, &pos, FILE_CURRENT)) {
- if(size.QuadPart == pos.QuadPart)
+ /* compare position with size, abort if not equal */
+ if(size.QuadPart == pos.QuadPart) {
+ /* sleep and continue waiting */
SleepEx(100, FALSE);
- else
- break;
+ continue;
+ }
}
- else
- break;
}
- else
- break;
+ /* there is some data available, stop waiting */
+ break;
}
break;
case FILE_TYPE_CHAR:
+ /* The handle represents a character input, this means:
+ * - WaitForMultipleObjectsEx will be signalled on any kind of input,
+ * including mouse and window size events we do not care about.
+ *
+ * Approach: Loop till either the internal event is signalled
+ * or we get signalled for an actual key-event.
+ */
while(WaitForMultipleObjectsEx(2, handles, FALSE, INFINITE, FALSE)
== WAIT_OBJECT_0 + 1) {
+ /* check if this is an actual console handle */
if(GetConsoleMode(handle, &length)) {
+ /* retrieve an event from the console buffer */
length = 0;
if(PeekConsoleInput(handle, &inputrecord, 1, &length)) {
- if(length == 1 && inputrecord.EventType != KEY_EVENT)
+ /* check if the event is not an actual key-event */
+ if(length == 1 && inputrecord.EventType != KEY_EVENT) {
+ /* purge the non-key-event and continue waiting */
ReadConsoleInput(handle, &inputrecord, 1, &length);
- else
- break;
+ continue;
+ }
}
- else
- break;
}
- else
- break;
+ /* there is some data available, stop waiting */
+ break;
}
break;
case FILE_TYPE_PIPE:
+ /* The handle represents an anonymous or named pipe, this means:
+ * - WaitForMultipleObjectsEx will always be signalled for it.
+ * - peek into the pipe and retrieve the amount of data available.
+ *
+ * Approach: Loop till either the internal event is signalled
+ * or there is data in the pipe available for reading.
+ */
while(WaitForMultipleObjectsEx(2, handles, FALSE, INFINITE, FALSE)
== WAIT_OBJECT_0 + 1) {
+ /* peek into the pipe and retrieve the amount of data available */
if(PeekNamedPipe(handle, NULL, 0, NULL, &length, NULL)) {
- if(length == 0)
+ /* if there is no data available, sleep and continue waiting */
+ if(length == 0) {
SleepEx(100, FALSE);
- else
- break;
+ continue;
+ }
}
else {
- if(GetLastError() == ERROR_BROKEN_PIPE)
+ /* if the pipe has been closed, sleep and continue waiting */
+ if(GetLastError() == ERROR_BROKEN_PIPE) {
SleepEx(100, FALSE);
- else
- break;
+ continue;
+ }
}
+ /* there is some data available, stop waiting */
+ break;
}
break;
default:
+ /* The handle has an unknown type, try to wait on it */
WaitForMultipleObjectsEx(2, handles, FALSE, INFINITE, FALSE);
break;
}
return 0;
}
+static HANDLE select_ws_wait(HANDLE handle, HANDLE event)
+{
+ struct select_ws_wait_data *data;
+ HANDLE thread = NULL;
+
+ /* allocate internal waiting data structure */
+ data = malloc(sizeof(struct select_ws_wait_data));
+ if(data) {
+ data->handle = handle;
+ data->event = event;
+
+ /* launch waiting thread */
+ thread = CreateThread(NULL, 0,
+ &select_ws_wait_thread,
+ data, 0, NULL);
+
+ /* free data if thread failed to launch */
+ if(!thread) {
+ free(data);
+ }
+ }
+
+ return thread;
+}
static int select_ws(int nfds, fd_set *readfds, fd_set *writefds,
fd_set *exceptfds, struct timeval *timeout)
{
DWORD milliseconds, wait, idx;
WSAEVENT wsaevent, *wsaevents;
WSANETWORKEVENTS wsanetevents;
- HANDLE handle, *handles;
+ HANDLE handle, *handles, *threads;
curl_socket_t sock, *fdarr, *wsasocks;
long networkevents;
int error, fds;
- HANDLE threadevent = NULL, threadhandle = NULL;
- DWORD nfd = 0, wsa = 0;
+ HANDLE waitevent = NULL;
+ DWORD nfd = 0, thd = 0, wsa = 0;
int ret = 0;
/* check if the input value is valid */
return 0;
}
+ /* create internal event to signal waiting threads */
+ waitevent = CreateEvent(NULL, TRUE, FALSE, NULL);
+ if(!waitevent) {
+ errno = ENOMEM;
+ return -1;
+ }
+
/* allocate internal array for the original input handles */
fdarr = malloc(nfds * sizeof(curl_socket_t));
if(fdarr == NULL) {
return -1;
}
+ /* allocate internal array for the internal threads handles */
+ threads = malloc(nfds * sizeof(HANDLE));
+ if(threads == NULL) {
+ free(handles);
+ free(fdarr);
+ errno = ENOMEM;
+ return -1;
+ }
+
/* allocate internal array for the internal socket handles */
wsasocks = malloc(nfds * sizeof(curl_socket_t));
if(wsasocks == NULL) {
+ free(threads);
free(handles);
free(fdarr);
errno = ENOMEM;
/* allocate internal array for the internal WINSOCK2 events */
wsaevents = malloc(nfds * sizeof(WSAEVENT));
if(wsaevents == NULL) {
+ free(threads);
free(wsasocks);
free(handles);
free(fdarr);
if(networkevents) {
fdarr[nfd] = curlx_sitosk(fds);
if(fds == fileno(stdin)) {
- threadevent = CreateEvent(NULL, TRUE, FALSE, NULL);
- threadhandle = CreateThread(NULL, 0,
- &select_ws_stdin_wait_thread,
- threadevent, 0, NULL);
- handles[nfd] = threadhandle;
+ handle = GetStdHandle(STD_INPUT_HANDLE);
+ handle = select_ws_wait(handle, waitevent);
+ handles[nfd] = handle;
+ threads[thd] = handle;
+ thd++;
}
else if(fds == fileno(stdout)) {
handles[nfd] = GetStdHandle(STD_OUTPUT_HANDLE);
if(wsaevent != WSA_INVALID_EVENT) {
error = WSAEventSelect(fds, wsaevent, networkevents);
if(error != SOCKET_ERROR) {
- handles[nfd] = wsaevent;
+ handle = (HANDLE) wsaevent;
+ handles[nfd] = handle;
wsasocks[wsa] = curlx_sitosk(fds);
wsaevents[wsa] = wsaevent;
wsa++;
}
else {
- handles[nfd] = (HANDLE) curlx_sitosk(fds);
WSACloseEvent(wsaevent);
+ handle = (HANDLE) curlx_sitosk(fds);
+ handle = select_ws_wait(handle, waitevent);
+ handles[nfd] = handle;
+ threads[thd] = handle;
+ thd++;
}
}
}
/* wait for one of the internal handles to trigger */
wait = WaitForMultipleObjectsEx(nfd, handles, FALSE, milliseconds, FALSE);
- /* signal the event handle for the waiting thread */
- if(threadevent) {
- SetEvent(threadevent);
- }
+ /* signal the event handle for the waiting threads */
+ SetEvent(waitevent);
/* loop over the internal handles returned in the descriptors */
for(idx = 0; idx < nfd; idx++) {
WSACloseEvent(wsaevents[idx]);
}
- if(threadhandle) {
- WaitForSingleObject(threadhandle, INFINITE);
- CloseHandle(threadhandle);
- }
- if(threadevent) {
- CloseHandle(threadevent);
+ for(idx = 0; idx < thd; idx++) {
+ WaitForSingleObject(threads[thd], INFINITE);
+ CloseHandle(threads[thd]);
}
+ CloseHandle(waitevent);
+
free(wsaevents);
free(wsasocks);
+ free(threads);
free(handles);
free(fdarr);
projects / platform / upstream / curl.git / commitdiff