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sockfilt.c: clean up threaded approach and add documentation

This commit is contained in:
Marc Hoersken 2014-04-22 17:21:40 +02:00
parent 6fd97fca88
commit 42c04eb1d1
1 changed files with 137 additions and 48 deletions
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185
tests/server/sockfilt.c
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@ -506,102 +506,170 @@ static void lograw(unsigned char *buffer, ssize_t len)
* 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 */
@ -616,6 +684,13 @@ static int select_ws(int nfds, fd_set *readfds, fd_set *writefds,
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) {
@ -631,9 +706,19 @@ static int select_ws(int nfds, fd_set *readfds, fd_set *writefds,
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;
@ -643,6 +728,7 @@ static int select_ws(int nfds, fd_set *readfds, fd_set *writefds,
/* allocate internal array for the internal WINSOCK2 events */
wsaevents = malloc(nfds * sizeof(WSAEVENT));
if(wsaevents == NULL) {
free(threads);
free(wsasocks);
free(handles);
free(fdarr);
@ -668,11 +754,11 @@ static int select_ws(int nfds, fd_set *readfds, fd_set *writefds,
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);
@ -685,14 +771,19 @@ static int select_ws(int nfds, fd_set *readfds, fd_set *writefds,
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++;
}
}
}
@ -711,10 +802,8 @@ static int select_ws(int nfds, fd_set *readfds, fd_set *writefds,
/* 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++) {
@ -783,16 +872,16 @@ static int select_ws(int nfds, fd_set *readfds, fd_set *writefds,
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);