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select.c
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/***********************************************************************/
/* */
/* OCaml */
/* */
/* Contributed by Sylvain Le Gall for Lexifi */
/* */
/* Copyright 2008 Institut National de Recherche en Informatique et */
/* en Automatique. All rights reserved. This file is distributed */
/* under the terms of the GNU Library General Public License, with */
/* the special exception on linking described in file ../../LICENSE. */
/* */
/***********************************************************************/
#include <caml/mlvalues.h>
#include <caml/alloc.h>
#include <caml/memory.h>
#include <caml/fail.h>
#include <caml/signals.h>
#include "winworker.h"
#include <stdio.h>
#include "windbug.h"
#include "winlist.h"
/* This constant define the maximum number of objects that
* can be handle by a SELECTDATA.
* It takes the following parameters into account:
* - limitation on number of objects is mostly due to limitation
* a WaitForMultipleObjects
* - there is always an event "hStop" to watch
*
* This lead to pick the following value as the biggest possible
* value
*/
#define MAXIMUM_SELECT_OBJECTS (MAXIMUM_WAIT_OBJECTS - 1)
/* Manage set of handle */
typedef struct _SELECTHANDLESET {
LPHANDLE lpHdl;
DWORD nMax;
DWORD nLast;
} SELECTHANDLESET;
typedef SELECTHANDLESET *LPSELECTHANDLESET;
void handle_set_init (LPSELECTHANDLESET hds, LPHANDLE lpHdl, DWORD max)
{
DWORD i;
hds->lpHdl = lpHdl;
hds->nMax = max;
hds->nLast = 0;
/* Set to invalid value every entry of the handle */
for (i = 0; i < hds->nMax; i++)
{
hds->lpHdl[i] = INVALID_HANDLE_VALUE;
};
}
void handle_set_add (LPSELECTHANDLESET hds, HANDLE hdl)
{
LPSELECTHANDLESET res;
if (hds->nLast < hds->nMax)
{
hds->lpHdl[hds->nLast] = hdl;
hds->nLast++;
}
DEBUG_PRINT("Adding handle %x to set %x", hdl, hds);
}
BOOL handle_set_mem (LPSELECTHANDLESET hds, HANDLE hdl)
{
BOOL res;
DWORD i;
res = FALSE;
for (i = 0; !res && i < hds->nLast; i++)
{
res = (hds->lpHdl[i] == hdl);
}
return res;
}
void handle_set_reset (LPSELECTHANDLESET hds)
{
DWORD i;
for (i = 0; i < hds->nMax; i++)
{
hds->lpHdl[i] = INVALID_HANDLE_VALUE;
}
hds->nMax = 0;
hds->nLast = 0;
hds->lpHdl = NULL;
}
/* Data structure for handling select */
typedef enum _SELECTHANDLETYPE {
SELECT_HANDLE_NONE = 0,
SELECT_HANDLE_DISK,
SELECT_HANDLE_CONSOLE,
SELECT_HANDLE_PIPE,
SELECT_HANDLE_SOCKET,
} SELECTHANDLETYPE;
typedef enum _SELECTMODE {
SELECT_MODE_NONE = 0,
SELECT_MODE_READ = 1,
SELECT_MODE_WRITE = 2,
SELECT_MODE_EXCEPT = 4,
} SELECTMODE;
typedef enum _SELECTSTATE {
SELECT_STATE_NONE = 0,
SELECT_STATE_INITFAILED,
SELECT_STATE_ERROR,
SELECT_STATE_SIGNALED
} SELECTSTATE;
typedef enum _SELECTTYPE {
SELECT_TYPE_NONE = 0,
SELECT_TYPE_STATIC, /* Result is known without running anything */
SELECT_TYPE_CONSOLE_READ, /* Reading data on console */
SELECT_TYPE_PIPE_READ, /* Reading data on pipe */
SELECT_TYPE_SOCKET /* Classic select */
} SELECTTYPE;
/* Data structure for results */
typedef struct _SELECTRESULT {
LIST lst;
SELECTMODE EMode;
int lpOrigIdx;
} SELECTRESULT;
typedef SELECTRESULT *LPSELECTRESULT;
/* Data structure for query */
typedef struct _SELECTQUERY {
LIST lst;
SELECTMODE EMode;
HANDLE hFileDescr;
int lpOrigIdx;
unsigned int uFlagsFd; /* Copy of filedescr->flags_fd */
} SELECTQUERY;
typedef SELECTQUERY *LPSELECTQUERY;
typedef struct _SELECTDATA {
LIST lst;
SELECTTYPE EType;
/* Sockets may generate a result for all three lists from one single
query object
*/
SELECTRESULT aResults[MAXIMUM_SELECT_OBJECTS * 3];
DWORD nResultsCount;
/* Data following are dedicated to APC like call, they
will be initialized if required.
*/
WORKERFUNC funcWorker;
SELECTQUERY aQueries[MAXIMUM_SELECT_OBJECTS];
DWORD nQueriesCount;
SELECTSTATE EState;
DWORD nError;
LPWORKER lpWorker;
} SELECTDATA;
typedef SELECTDATA *LPSELECTDATA;
/* Get error status if associated condition is false */
static BOOL check_error(LPSELECTDATA lpSelectData, BOOL bFailed)
{
if (bFailed && lpSelectData->nError == 0)
{
lpSelectData->EState = SELECT_STATE_ERROR;
lpSelectData->nError = GetLastError();
}
return bFailed;
}
/* Create data associated with a select operation */
LPSELECTDATA select_data_new (LPSELECTDATA lpSelectData, SELECTTYPE EType)
{
/* Allocate the data structure */
LPSELECTDATA res;
DWORD i;
res = (LPSELECTDATA)caml_stat_alloc(sizeof(SELECTDATA));
/* Init common data */
list_init((LPLIST)res);
list_next_set((LPLIST)res, (LPLIST)lpSelectData);
res->EType = EType;
res->nResultsCount = 0;
/* Data following are dedicated to APC like call, they
will be initialized if required. For now they are set to
invalid values.
*/
res->funcWorker = NULL;
res->nQueriesCount = 0;
res->EState = SELECT_STATE_NONE;
res->nError = 0;
res->lpWorker = NULL;
return res;
}
/* Free select data */
void select_data_free (LPSELECTDATA lpSelectData)
{
DWORD i;
DEBUG_PRINT("Freeing data of %x", lpSelectData);
/* Free APC related data, if they exists */
if (lpSelectData->lpWorker != NULL)
{
worker_job_finish(lpSelectData->lpWorker);
lpSelectData->lpWorker = NULL;
};
/* Make sure results/queries cannot be accessed */
lpSelectData->nResultsCount = 0;
lpSelectData->nQueriesCount = 0;
caml_stat_free(lpSelectData);
}
/* Add a result to select data, return zero if something goes wrong. */
DWORD select_data_result_add (LPSELECTDATA lpSelectData, SELECTMODE EMode,
int lpOrigIdx)
{
DWORD res;
DWORD i;
res = 0;
if (lpSelectData->nResultsCount < MAXIMUM_SELECT_OBJECTS * 3)
{
i = lpSelectData->nResultsCount;
lpSelectData->aResults[i].EMode = EMode;
lpSelectData->aResults[i].lpOrigIdx = lpOrigIdx;
lpSelectData->nResultsCount++;
res = 1;
}
return res;
}
/* Add a query to select data, return zero if something goes wrong */
DWORD select_data_query_add (LPSELECTDATA lpSelectData,
SELECTMODE EMode,
HANDLE hFileDescr,
int lpOrigIdx,
unsigned int uFlagsFd)
{
DWORD res;
DWORD i;
res = 0;
if (lpSelectData->nQueriesCount < MAXIMUM_SELECT_OBJECTS)
{
i = lpSelectData->nQueriesCount;
lpSelectData->aQueries[i].EMode = EMode;
lpSelectData->aQueries[i].hFileDescr = hFileDescr;
lpSelectData->aQueries[i].lpOrigIdx = lpOrigIdx;
lpSelectData->aQueries[i].uFlagsFd = uFlagsFd;
lpSelectData->nQueriesCount++;
res = 1;
}
return res;
}
/* Search for a job that has available query slots and that match provided type.
* If none is found, create a new one. Return the corresponding SELECTDATA, and
* update provided SELECTDATA head, if required.
*/
LPSELECTDATA select_data_job_search (LPSELECTDATA *lppSelectData,
SELECTTYPE EType)
{
LPSELECTDATA res;
res = NULL;
/* Search for job */
DEBUG_PRINT("Searching an available job for type %d", EType);
res = *lppSelectData;
while (
res != NULL
&& !(
res->EType == EType
&& res->nQueriesCount < MAXIMUM_SELECT_OBJECTS
)
)
{
res = LIST_NEXT(LPSELECTDATA, res);
}
/* No matching job found, create one */
if (res == NULL)
{
DEBUG_PRINT("No job for type %d found, create one", EType);
res = select_data_new(*lppSelectData, EType);
*lppSelectData = res;
}
return res;
}
/***********************/
/* Console */
/***********************/
void read_console_poll(HANDLE hStop, void *_data)
{
HANDLE events[2];
INPUT_RECORD record;
DWORD waitRes;
DWORD n;
LPSELECTDATA lpSelectData;
LPSELECTQUERY lpQuery;
DEBUG_PRINT("Waiting for data on console");
record;
waitRes = 0;
n = 0;
lpSelectData = (LPSELECTDATA)_data;
lpQuery = &(lpSelectData->aQueries[0]);
events[0] = hStop;
events[1] = lpQuery->hFileDescr;
while (lpSelectData->EState == SELECT_STATE_NONE)
{
waitRes = WaitForMultipleObjects(2, events, FALSE, INFINITE);
if (waitRes == WAIT_OBJECT_0
|| check_error(lpSelectData, waitRes == WAIT_FAILED))
{
/* stop worker event or error */
break;
}
/* console event */
if (check_error(lpSelectData, PeekConsoleInput(lpQuery->hFileDescr,
&record, 1, &n)
== 0))
{
break;
}
/* check for ASCII keypress only */
if (record.EventType == KEY_EVENT &&
record.Event.KeyEvent.bKeyDown &&
record.Event.KeyEvent.uChar.AsciiChar != 0)
{
select_data_result_add(lpSelectData, lpQuery->EMode, lpQuery->lpOrigIdx);
lpSelectData->EState = SELECT_STATE_SIGNALED;
break;
}
else
{
/* discard everything else and try again */
if (check_error(lpSelectData, ReadConsoleInput(lpQuery->hFileDescr,
&record, 1, &n)
== 0))
{
break;
}
}
};
}
/* Add a function to monitor console input */
LPSELECTDATA read_console_poll_add (LPSELECTDATA lpSelectData,
SELECTMODE EMode,
HANDLE hFileDescr,
int lpOrigIdx,
unsigned int uFlagsFd)
{
LPSELECTDATA res;
res = select_data_new(lpSelectData, SELECT_TYPE_CONSOLE_READ);
res->funcWorker = read_console_poll;
select_data_query_add(res, SELECT_MODE_READ, hFileDescr, lpOrigIdx, uFlagsFd);
return res;
}
/***********************/
/* Pipe */
/***********************/
/* Monitor a pipe for input */
void read_pipe_poll (HANDLE hStop, void *_data)
{
DWORD res;
DWORD event;
DWORD n;
LPSELECTQUERY iterQuery;
LPSELECTDATA lpSelectData;
DWORD i;
DWORD wait;
/* Poll pipe */
event = 0;
n = 0;
lpSelectData = (LPSELECTDATA)_data;
wait = 1;
DEBUG_PRINT("Checking data pipe");
while (lpSelectData->EState == SELECT_STATE_NONE)
{
for (i = 0; i < lpSelectData->nQueriesCount; i++)
{
iterQuery = &(lpSelectData->aQueries[i]);
res = PeekNamedPipe(
iterQuery->hFileDescr,
NULL,
0,
NULL,
&n,
NULL);
if (check_error(lpSelectData,
(res == 0) &&
(GetLastError() != ERROR_BROKEN_PIPE)))
{
break;
};
if ((n > 0) || (res == 0))
{
lpSelectData->EState = SELECT_STATE_SIGNALED;
select_data_result_add(lpSelectData, iterQuery->EMode,
iterQuery->lpOrigIdx);
};
};
/* Alas, nothing except polling seems to work for pipes.
Check the state & stop_worker_event every 10 ms
*/
if (lpSelectData->EState == SELECT_STATE_NONE)
{
event = WaitForSingleObject(hStop, wait);
/* Fast start: begin to wait 1, 2, 4, 8 and then 10 ms.
* If we are working with the output of a program there is
* a chance that one of the 4 first calls succeed.
*/
wait = 2 * wait;
if (wait > 10)
{
wait = 10;
};
if (event == WAIT_OBJECT_0
|| check_error(lpSelectData, event == WAIT_FAILED))
{
break;
}
}
}
DEBUG_PRINT("Finish checking data on pipe");
}
/* Add a function to monitor pipe input */
LPSELECTDATA read_pipe_poll_add (LPSELECTDATA lpSelectData,
SELECTMODE EMode,
HANDLE hFileDescr,
int lpOrigIdx,
unsigned int uFlagsFd)
{
LPSELECTDATA res;
LPSELECTDATA hd;
hd = lpSelectData;
/* Polling pipe is a non blocking operation by default. This means that each
worker can handle many pipe. We begin to try to find a worker that is
polling pipe, but for which there is under the limit of pipe per worker.
*/
DEBUG_PRINT("Searching an available worker handling pipe");
res = select_data_job_search(&hd, SELECT_TYPE_PIPE_READ);
/* Add a new pipe to poll */
res->funcWorker = read_pipe_poll;
select_data_query_add(res, EMode, hFileDescr, lpOrigIdx, uFlagsFd);
return hd;
}
/***********************/
/* Socket */
/***********************/
/* Monitor socket */
void socket_poll (HANDLE hStop, void *_data)
{
LPSELECTDATA lpSelectData;
LPSELECTQUERY iterQuery;
HANDLE aEvents[MAXIMUM_SELECT_OBJECTS];
DWORD nEvents;
long maskEvents;
DWORD i;
u_long iMode;
SELECTMODE mode;
WSANETWORKEVENTS events;
lpSelectData = (LPSELECTDATA)_data;
DEBUG_PRINT("Worker has %d queries to service", lpSelectData->nQueriesCount);
for (nEvents = 0; nEvents < lpSelectData->nQueriesCount; nEvents++)
{
iterQuery = &(lpSelectData->aQueries[nEvents]);
aEvents[nEvents] = CreateEvent(NULL, TRUE, FALSE, NULL);
maskEvents = 0;
mode = iterQuery->EMode;
if ((mode & SELECT_MODE_READ) != 0)
{
DEBUG_PRINT("Polling read for %d", iterQuery->hFileDescr);
maskEvents |= FD_READ | FD_ACCEPT | FD_CLOSE;
}
if ((mode & SELECT_MODE_WRITE) != 0)
{
DEBUG_PRINT("Polling write for %d", iterQuery->hFileDescr);
maskEvents |= FD_WRITE | FD_CONNECT | FD_CLOSE;
}
if ((mode & SELECT_MODE_EXCEPT) != 0)
{
DEBUG_PRINT("Polling exceptions for %d", iterQuery->hFileDescr);
maskEvents |= FD_OOB;
}
check_error(lpSelectData,
WSAEventSelect(
(SOCKET)(iterQuery->hFileDescr),
aEvents[nEvents],
maskEvents) == SOCKET_ERROR);
}
/* Add stop event */
aEvents[nEvents] = hStop;
nEvents++;
if (lpSelectData->nError == 0)
{
check_error(lpSelectData,
WaitForMultipleObjects(
nEvents,
aEvents,
FALSE,
INFINITE) == WAIT_FAILED);
};
if (lpSelectData->nError == 0)
{
for (i = 0; i < lpSelectData->nQueriesCount; i++)
{
iterQuery = &(lpSelectData->aQueries[i]);
if (WaitForSingleObject(aEvents[i], 0) == WAIT_OBJECT_0)
{
DEBUG_PRINT("Socket %d has pending events", (i - 1));
if (iterQuery != NULL)
{
/* Find out what kind of events were raised
*/
if (WSAEnumNetworkEvents((SOCKET)(iterQuery->hFileDescr),
aEvents[i], &events) == 0)
{
if ((iterQuery->EMode & SELECT_MODE_READ) != 0
&& (events.lNetworkEvents & (FD_READ | FD_ACCEPT | FD_CLOSE))
!= 0)
{
select_data_result_add(lpSelectData, SELECT_MODE_READ,
iterQuery->lpOrigIdx);
}
if ((iterQuery->EMode & SELECT_MODE_WRITE) != 0
&& (events.lNetworkEvents & (FD_WRITE | FD_CONNECT | FD_CLOSE))
!= 0)
{
select_data_result_add(lpSelectData, SELECT_MODE_WRITE,
iterQuery->lpOrigIdx);
}
if ((iterQuery->EMode & SELECT_MODE_EXCEPT) != 0
&& (events.lNetworkEvents & FD_OOB) != 0)
{
select_data_result_add(lpSelectData, SELECT_MODE_EXCEPT,
iterQuery->lpOrigIdx);
}
}
}
}
/* WSAEventSelect() automatically sets socket to nonblocking mode.
Restore the blocking one. */
if (iterQuery->uFlagsFd & FLAGS_FD_IS_BLOCKING)
{
DEBUG_PRINT("Restore a blocking socket");
iMode = 0;
check_error(lpSelectData,
WSAEventSelect((SOCKET)(iterQuery->hFileDescr), aEvents[i], 0) != 0 ||
ioctlsocket((SOCKET)(iterQuery->hFileDescr), FIONBIO, &iMode) != 0);
}
else
{
check_error(lpSelectData,
WSAEventSelect((SOCKET)(iterQuery->hFileDescr), aEvents[i], 0) != 0);
};
CloseHandle(aEvents[i]);
aEvents[i] = INVALID_HANDLE_VALUE;
}
}
}
/* Add a function to monitor socket */
LPSELECTDATA socket_poll_add (LPSELECTDATA lpSelectData,
SELECTMODE EMode,
HANDLE hFileDescr,
int lpOrigIdx,
unsigned int uFlagsFd)
{
LPSELECTDATA res;
LPSELECTDATA candidate;
long i;
LPSELECTQUERY aQueries;
res = lpSelectData;
candidate = NULL;
aQueries = NULL;
/* Polling socket can be done mulitple handle at the same time. You just
need one worker to use it. Try to find if there is already a worker
handling this kind of request.
Only one event can be associated with a given socket which means
that if a socket is in more than one of the fd_sets then we have
to find that particular query and update EMode with the
additional flag.
*/
DEBUG_PRINT("Scanning list of worker to find one that already handle socket");
/* Search for job */
DEBUG_PRINT("Searching for an available job for type %d for descriptor %d",
SELECT_TYPE_SOCKET, hFileDescr);
while (res != NULL)
{
if (res->EType == SELECT_TYPE_SOCKET)
{
i = res->nQueriesCount - 1;
aQueries = res->aQueries;
while (i >= 0 && aQueries[i].hFileDescr != hFileDescr)
{
i--;
}
/* If we didn't find the socket but this worker has available
slots, store it
*/
if (i < 0)
{
if ( res->nQueriesCount < MAXIMUM_SELECT_OBJECTS)
{
candidate = res;
}
res = LIST_NEXT(LPSELECTDATA, res);
}
else
{
/* Previous socket query located -- we're finished
*/
aQueries = &aQueries[i];
break;
}
}
else
{
res = LIST_NEXT(LPSELECTDATA, res);
}
}
if (res == NULL)
{
res = candidate;
/* No matching job found, create one */
if (res == NULL)
{
DEBUG_PRINT("No job for type %d found, create one", SELECT_TYPE_SOCKET);
res = select_data_new(lpSelectData, SELECT_TYPE_SOCKET);
res->funcWorker = socket_poll;
res->nQueriesCount = 1;
aQueries = &res->aQueries[0];
}
else
{
aQueries = &(res->aQueries[res->nQueriesCount++]);
}
aQueries->EMode = EMode;
aQueries->hFileDescr = hFileDescr;
aQueries->lpOrigIdx = lpOrigIdx;
aQueries->uFlagsFd = uFlagsFd;
DEBUG_PRINT("Socket %x added", hFileDescr);
}
else
{
aQueries->EMode |= EMode;
DEBUG_PRINT("Socket %x updated to %d", hFileDescr, aQueries->EMode);
}
return res;
}
/***********************/
/* Static */
/***********************/
/* Add a static result */
LPSELECTDATA static_poll_add (LPSELECTDATA lpSelectData,
SELECTMODE EMode,
HANDLE hFileDescr,
int lpOrigIdx,
unsigned int uFlagsFd)
{
LPSELECTDATA res;
LPSELECTDATA hd;
/* Look for an already initialized static element */
hd = lpSelectData;
res = select_data_job_search(&hd, SELECT_TYPE_STATIC);
/* Add a new query/result */
select_data_query_add(res, EMode, hFileDescr, lpOrigIdx, uFlagsFd);
select_data_result_add(res, EMode, lpOrigIdx);
return hd;
}
/********************************/
/* Generic select data handling */
/********************************/
/* Guess handle type */
static SELECTHANDLETYPE get_handle_type(value fd)
{
DWORD mode;
SELECTHANDLETYPE res;
CAMLparam1(fd);
mode = 0;
res = SELECT_HANDLE_NONE;
if (Descr_kind_val(fd) == KIND_SOCKET)
{
res = SELECT_HANDLE_SOCKET;
}
else
{
switch(GetFileType(Handle_val(fd)))
{
case FILE_TYPE_DISK:
res = SELECT_HANDLE_DISK;
break;
case FILE_TYPE_CHAR: /* character file or a console */
if (GetConsoleMode(Handle_val(fd), &mode) != 0)
{
res = SELECT_HANDLE_CONSOLE;
}
else
{
res = SELECT_HANDLE_NONE;
};
break;
case FILE_TYPE_PIPE: /* a named or an anonymous pipe (socket
already handled) */
res = SELECT_HANDLE_PIPE;
break;
};
};
CAMLreturnT(SELECTHANDLETYPE, res);
}
/* Choose what to do with given data */
LPSELECTDATA select_data_dispatch (LPSELECTDATA lpSelectData, SELECTMODE EMode,
value fd, int lpOrigIdx)
{
LPSELECTDATA res;
HANDLE hFileDescr;
struct sockaddr sa;
int sa_len;
BOOL alreadyAdded;
unsigned int uFlagsFd;
CAMLparam1(fd);
res = lpSelectData;
hFileDescr = Handle_val(fd);
sa_len = sizeof(sa);
alreadyAdded = FALSE;
uFlagsFd = Flags_fd_val(fd);
DEBUG_PRINT("Begin dispatching handle %x", hFileDescr);
DEBUG_PRINT("Waiting for %d on handle %x", EMode, hFileDescr);
/* There is only 2 way to have except mode: transmission of OOB data through
a socket TCP/IP and through a strange interaction with a TTY.
With windows, we only consider the TCP/IP except condition
*/
switch(get_handle_type(fd))
{
case SELECT_HANDLE_DISK:
DEBUG_PRINT("Handle %x is a disk handle", hFileDescr);
/* Disk is always ready in read/write operation */
if (EMode == SELECT_MODE_READ || EMode == SELECT_MODE_WRITE)
{
res = static_poll_add(res, EMode, hFileDescr, lpOrigIdx, uFlagsFd);
};
break;
case SELECT_HANDLE_CONSOLE:
DEBUG_PRINT("Handle %x is a console handle", hFileDescr);
/* Console is always ready in write operation, need to check for read. */
if (EMode == SELECT_MODE_READ)
{
res = read_console_poll_add(res, EMode, hFileDescr, lpOrigIdx,
uFlagsFd);
}
else if (EMode == SELECT_MODE_WRITE)
{
res = static_poll_add(res, EMode, hFileDescr, lpOrigIdx, uFlagsFd);
};
break;
case SELECT_HANDLE_PIPE:
DEBUG_PRINT("Handle %x is a pipe handle", hFileDescr);
/* Console is always ready in write operation, need to check for read. */
if (EMode == SELECT_MODE_READ)
{
DEBUG_PRINT("Need to check availability of data on pipe");
res = read_pipe_poll_add(res, EMode, hFileDescr, lpOrigIdx, uFlagsFd);
}
else if (EMode == SELECT_MODE_WRITE)
{
DEBUG_PRINT("No need to check availability of data on pipe, "
"write operation always possible");
res = static_poll_add(res, EMode, hFileDescr, lpOrigIdx, uFlagsFd);
};
break;
case SELECT_HANDLE_SOCKET:
DEBUG_PRINT("Handle %x is a socket handle", hFileDescr);
if (getsockname((SOCKET)hFileDescr, &sa, &sa_len) == SOCKET_ERROR)
{
if (WSAGetLastError() == WSAEINVAL)
{
/* Socket is not bound */
DEBUG_PRINT("Socket is not connected");
if (EMode == SELECT_MODE_WRITE || EMode == SELECT_MODE_READ)
{
res = static_poll_add(res, EMode, hFileDescr, lpOrigIdx, uFlagsFd);
alreadyAdded = TRUE;
}
}
}
if (!alreadyAdded)
{
res = socket_poll_add(res, EMode, hFileDescr, lpOrigIdx, uFlagsFd);
}
break;
default:
DEBUG_PRINT("Handle %x is unknown", hFileDescr);
win32_maperr(ERROR_INVALID_HANDLE);
uerror("select", Nothing);
break;
};
DEBUG_PRINT("Finish dispatching handle %x", hFileDescr);
CAMLreturnT(LPSELECTDATA, res);
}
static DWORD caml_list_length (value lst)
{
DWORD res;
CAMLparam1 (lst);
CAMLlocal1 (l);
for (res = 0, l = lst; l != Val_int(0); l = Field(l, 1), res++)
{ }
CAMLreturnT(DWORD, res);
}
static value find_handle(LPSELECTRESULT iterResult, value readfds,
value writefds, value exceptfds)
{
CAMLparam3(readfds, writefds, exceptfds);
CAMLlocal2(result, list);
int i;
switch( iterResult->EMode )
{
case SELECT_MODE_READ:
list = readfds;
break;
case SELECT_MODE_WRITE:
list = writefds;
break;
case SELECT_MODE_EXCEPT:
list = exceptfds;
break;
};
for(i=0; list != Val_unit && i < iterResult->lpOrigIdx; ++i )
{
list = Field(list, 1);
}
if (list == Val_unit)
failwith ("select.c: original file handle not found");
result = Field(list, 0);
CAMLreturn( result );
}
#define MAX(a, b) ((a) > (b) ? (a) : (b))
/* Convert fdlist to an fd_set if all the handles in fdlist are
* sockets and return 0. Returns 1 if a non-socket value is
* encountered.
*/
static int fdlist_to_fdset(value fdlist, fd_set *fdset)
{
value l, c;
FD_ZERO(fdset);
for (l = fdlist; l != Val_int(0); l = Field(l, 1)) {
c = Field(l, 0);
if (Descr_kind_val(c) == KIND_SOCKET) {
FD_SET(Socket_val(c), fdset);
} else {
DEBUG_PRINT("Non socket value encountered");
return 0;
}
}
return 1;
}
static value fdset_to_fdlist(value fdlist, fd_set *fdset)
{
value res = Val_int(0);
Begin_roots2(fdlist, res)
for (/*nothing*/; fdlist != Val_int(0); fdlist = Field(fdlist, 1)) {
value s = Field(fdlist, 0);
if (FD_ISSET(Socket_val(s), fdset)) {
value newres = alloc_small(2, 0);
Field(newres, 0) = s;
Field(newres, 1) = res;
res = newres;
}
}
End_roots();
return res;
}
CAMLprim value unix_select(value readfds, value writefds, value exceptfds,
value timeout)
{
/* Event associated to handle */
DWORD nEventsCount;
DWORD nEventsMax;
HANDLE *lpEventsDone;
/* Data for all handles */
LPSELECTDATA lpSelectData;
LPSELECTDATA iterSelectData;
/* Iterator for results */
LPSELECTRESULT iterResult;
/* Iterator */
DWORD i;
/* Error status */
DWORD err;
/* Time to wait */
DWORD milliseconds;
/* Is there static select data */
BOOL hasStaticData = FALSE;
/* Wait return */
DWORD waitRet;
/* Set of handle */
SELECTHANDLESET hds;