Sweden-Number/server/async.c

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/*
* Server-side support for async i/o operations
*
* Copyright (C) 1998 Alexandre Julliard
* Copyright (C) 2000 Mike McCormack
*
* TODO:
* Fix up WaitCommEvent operations. Currently only EV_RXCHAR is supported.
* This may require modifications to the linux kernel to enable select
* to wait on Modem Status Register deltas. (delta DCD, CTS, DSR or RING)
*
*/
#include "config.h"
#include <assert.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#ifdef HAVE_SYS_ERRNO_H
#include <sys/errno.h>
#endif
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include <utime.h>
#include <termios.h>
#include <sys/ioctl.h>
#include "winerror.h"
#include "winbase.h"
#include "handle.h"
#include "thread.h"
#include "request.h"
struct async
{
struct object obj;
void *client_overlapped;
int type;
int result;
int count;
int eventmask;
struct async *next;
struct timeval tv;
struct timeout_user *timeout;
struct wait_queue_entry wait;
void *buffer;
void *func;
struct thread *thread;
struct object *file;
};
static void async_dump( struct object *obj, int verbose );
static void async_destroy( struct object *obj );
static int async_get_poll_events( struct object *obj );
static int async_get_fd( struct object *obj );
static int async_get_info( struct object *obj, struct get_file_info_request *req );
static void async_poll_event( struct object *obj, int event );
static void overlapped_timeout (void *private);
static const struct object_ops async_ops =
{
sizeof(struct async), /* size */
async_dump, /* dump */
default_poll_add_queue, /* add_queue */
default_poll_remove_queue, /* remove_queue */
default_poll_signaled, /* signaled */
no_satisfied, /* satisfied */
async_get_poll_events, /* get_poll_events */
async_poll_event, /* poll_event */
async_get_fd, /* get_fd */
no_flush, /* flush */
async_get_info, /* get_file_info */
async_destroy /* destroy */
};
static void async_dump( struct object *obj, int verbose )
{
struct async *ov = (struct async *)obj;
assert( obj->ops == &async_ops );
fprintf( stderr, "async: overlapped %p %s\n",
ov->client_overlapped, ov->timeout?"with timeout":"");
}
/* same as file_destroy, but don't delete comm ports */
static void async_destroy( struct object *obj )
{
struct async *ov = (struct async *)obj;
assert( obj->ops == &async_ops );
if(ov->timeout)
{
remove_timeout_user(ov->timeout);
ov->timeout = NULL;
}
}
struct async *get_async_obj( struct process *process, handle_t handle, unsigned int access )
{
return (struct async *)get_handle_obj( process, handle, access, &async_ops );
}
static int async_get_poll_events( struct object *obj )
{
struct async *ov = (struct async *)obj;
assert( obj->ops == &async_ops );
/* FIXME: this should be a function pointer */
return serial_async_get_poll_events(ov);
}
static int async_get_fd( struct object *obj )
{
struct async *async = (struct async *)obj;
assert( obj->ops == &async_ops );
return async->obj.fd;
}
static int async_get_info( struct object *obj, struct get_file_info_request *req ) {
assert( obj->ops == &async_ops );
req->type = FILE_TYPE_CHAR;
req->attr = 0;
req->access_time = 0;
req->write_time = 0;
req->size_high = 0;
req->size_low = 0;
req->links = 0;
req->index_high = 0;
req->index_low = 0;
req->serial = 0;
return 1;
}
/* data access functions */
int async_type(struct async *ov)
{
return ov->type;
}
int async_count(struct async *ov)
{
return ov->count;
}
int async_get_eventmask(struct async *ov)
{
return ov->eventmask;
}
int async_set_eventmask(struct async *ov, int eventmask)
{
return ov->eventmask = eventmask;
}
DECL_HANDLER(create_async)
{
struct object *obj;
struct async *ov = NULL;
int fd;
req->ov_handle = 0;
if (!(obj = get_handle_obj( current->process, req->file_handle, 0, NULL)) )
return;
fd = dup(obj->fd);
if(fd<0)
{
release_object(obj);
set_error(STATUS_UNSUCCESSFUL);
return;
}
if(0>fcntl(fd, F_SETFL, O_NONBLOCK))
{
release_object(obj);
set_error(STATUS_UNSUCCESSFUL);
return;
}
ov = alloc_object (&async_ops, fd);
if(!ov)
{
release_object(obj);
set_error(STATUS_UNSUCCESSFUL);
return;
}
ov->client_overlapped = req->overlapped;
ov->next = NULL;
ov->timeout = NULL;
ov->type = req->type;
ov->thread = current;
ov->func = req->func;
ov->file = obj;
ov->buffer = req->buffer;
ov->count = req->count;
ov->tv.tv_sec = 0;
ov->tv.tv_usec = 0;
/* FIXME: this should be a function pointer */
serial_async_setup(obj,ov);
if( ov->tv.tv_sec || ov->tv.tv_usec )
{
ov->timeout = add_timeout_user(&ov->tv, overlapped_timeout, ov);
}
ov->obj.ops->add_queue(&ov->obj,&ov->wait);
req->ov_handle = alloc_handle( current->process, ov, GENERIC_READ|GENERIC_WRITE, 0 );
release_object(obj);
}
/* handler for async poll() events */
static void async_poll_event( struct object *obj, int event )
{
struct async *ov = (struct async *) obj;
/* queue an APC in the client thread to do our dirty work */
ov->obj.ops->remove_queue(&ov->obj,&ov->wait);
if(ov->timeout)
{
remove_timeout_user(ov->timeout);
ov->timeout = NULL;
}
/* FIXME: this should be a function pointer */
event = serial_async_poll_event(obj,event);
thread_queue_apc(ov->thread, NULL, ov->func, APC_ASYNC, 1, 3,
ov->client_overlapped, ov->buffer, event);
}
/* handler for async i/o timeouts */
static void overlapped_timeout (void *private)
{
struct async *ov = (struct async *) private;
ov->obj.ops->remove_queue(&ov->obj,&ov->wait);
ov->timeout = NULL;
thread_queue_apc(ov->thread, NULL, ov->func, APC_ASYNC, 1, 3,
ov->client_overlapped,ov->buffer, 0);
}
void async_add_timeout(struct async *ov, int timeout)
{
if(timeout)
{
gettimeofday(&ov->tv,0);
add_timeout(&ov->tv,timeout);
}
}
DECL_HANDLER(async_result)
{
struct async *ov;
if ((ov = get_async_obj( current->process, req->ov_handle, 0 )))
{
ov->result = req->result;
if(ov->result == STATUS_PENDING)
{
ov->obj.ops->add_queue(&ov->obj,&ov->wait);
if( (ov->tv.tv_sec || ov->tv.tv_usec) && !ov->timeout)
{
ov->timeout = add_timeout_user(&ov->tv, overlapped_timeout, ov);
}
}
release_object( ov );
}
}