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Sweden-Number/server/serial.c

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/*
* Server-side serial port communications management
*
* Copyright (C) 1998 Alexandre Julliard
* Copyright (C) 2000,2001 Mike McCormack
*
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#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/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"
#include "async.h"
static void serial_dump( struct object *obj, int verbose );
static int serial_get_fd( struct object *obj );
static int serial_get_info( struct object *obj, struct get_file_info_reply *reply, int *flags );
static int serial_get_poll_events( struct object *obj );
static struct async_queue * serial_queue_async(struct object *obj, struct async* async, int type, int count);
static void destroy_serial(struct object *obj);
static void serial_poll_event( struct object *obj, int event );
struct serial
{
struct object obj;
unsigned int access;
unsigned int attrib;
/* timeout values */
unsigned int readinterval;
unsigned int readconst;
unsigned int readmult;
unsigned int writeconst;
unsigned int writemult;
unsigned int eventmask;
unsigned int commerror;
struct termios original;
struct async_queue read_q;
struct async_queue write_q;
struct async_queue wait_q;
/* FIXME: add dcb, comm status, handler module, sharing */
};
static const struct object_ops serial_ops =
{
sizeof(struct serial), /* size */
serial_dump, /* dump */
default_poll_add_queue, /* add_queue */
default_poll_remove_queue, /* remove_queue */
default_poll_signaled, /* signaled */
no_satisfied, /* satisfied */
serial_get_poll_events, /* get_poll_events */
serial_poll_event, /* poll_event */
serial_get_fd, /* get_fd */
no_flush, /* flush */
serial_get_info, /* get_file_info */
serial_queue_async, /* queue_async */
destroy_serial /* destroy */
};
static struct serial *create_serial( const char *nameptr, size_t len, unsigned int access, int attributes )
{
struct serial *serial;
struct termios tios;
int fd, flags = 0;
char *name;
if (!(name = mem_alloc( len + 1 ))) return NULL;
memcpy( name, nameptr, len );
name[len] = 0;
switch(access & (GENERIC_READ | GENERIC_WRITE))
{
case GENERIC_READ: flags |= O_RDONLY; break;
case GENERIC_WRITE: flags |= O_WRONLY; break;
case GENERIC_READ|GENERIC_WRITE: flags |= O_RDWR; break;
default: break;
}
flags |= O_NONBLOCK;
fd = open( name, flags );
free( name );
if (fd < 0)
{
file_set_error();
return NULL;
}
/* check its really a serial port */
if (tcgetattr(fd,&tios))
{
file_set_error();
close( fd );
return NULL;
}
/* set the fd back to blocking if necessary */
if( ! (attributes & FILE_FLAG_OVERLAPPED) )
if(0>fcntl(fd, F_SETFL, 0))
perror("fcntl");
if ((serial = alloc_object( &serial_ops, fd )))
{
serial->attrib = attributes;
serial->access = access;
serial->readinterval = 0;
serial->readmult = 0;
serial->readconst = 0;
serial->writemult = 0;
serial->writeconst = 0;
serial->eventmask = 0;
serial->commerror = 0;
init_async_queue(&serial->read_q);
init_async_queue(&serial->write_q);
init_async_queue(&serial->wait_q);
}
return serial;
}
static void destroy_serial( struct object *obj)
{
struct serial *serial = (struct serial *)obj;
destroy_async_queue(&serial->read_q);
destroy_async_queue(&serial->write_q);
destroy_async_queue(&serial->wait_q);
}
static void serial_dump( struct object *obj, int verbose )
{
struct serial *serial = (struct serial *)obj;
assert( obj->ops == &serial_ops );
fprintf( stderr, "Port fd=%d mask=%x\n", serial->obj.fd, serial->eventmask );
}
struct serial *get_serial_obj( struct process *process, handle_t handle, unsigned int access )
{
return (struct serial *)get_handle_obj( process, handle, access, &serial_ops );
}
static int serial_get_poll_events( struct object *obj )
{
struct serial *serial = (struct serial *)obj;
int events = 0;
assert( obj->ops == &serial_ops );
if(IS_READY(serial->read_q))
events |= POLLIN;
if(IS_READY(serial->write_q))
events |= POLLOUT;
if(IS_READY(serial->wait_q))
events |= POLLIN;
/* fprintf(stderr,"poll events are %04x\n",events); */
return events;
}
static int serial_get_fd( struct object *obj )
{
struct serial *serial = (struct serial *)obj;
assert( obj->ops == &serial_ops );
return serial->obj.fd;
}
static int serial_get_info( struct object *obj, struct get_file_info_reply *reply, int *flags )
{
struct serial *serial = (struct serial *) obj;
assert( obj->ops == &serial_ops );
if (reply)
{
reply->type = FILE_TYPE_CHAR;
reply->attr = 0;
reply->access_time = 0;
reply->write_time = 0;
reply->size_high = 0;
reply->size_low = 0;
reply->links = 0;
reply->index_high = 0;
reply->index_low = 0;
reply->serial = 0;
}
*flags = 0;
if(serial->attrib & FILE_FLAG_OVERLAPPED)
*flags |= FD_FLAG_OVERLAPPED;
else if(!((serial->readinterval == MAXDWORD) &&
(serial->readmult == 0) && (serial->readconst == 0)) )
*flags |= FD_FLAG_TIMEOUT;
return FD_TYPE_DEFAULT;
}
static void serial_poll_event(struct object *obj, int event)
{
struct serial *serial = (struct serial *)obj;
/* fprintf(stderr,"Poll event %02x\n",event); */
if(IS_READY(serial->read_q) && (POLLIN & event) )
async_notify(serial->read_q.head,STATUS_ALERTED);
if(IS_READY(serial->write_q) && (POLLOUT & event) )
async_notify(serial->write_q.head,STATUS_ALERTED);
if(IS_READY(serial->wait_q) && (POLLIN & event) )
async_notify(serial->wait_q.head,STATUS_ALERTED);
set_select_events(obj,obj->ops->get_poll_events(obj));
}
/*
* This function is an abuse of overloading that deserves some explanation.
*
* It has three purposes:
*
* 1. get the queue for a type of async operation
* 2. requeue an async operation
* 3. queue a new async operation
*
* It is overloaded so that these three functions only take one function pointer
* in the object operations list.
*
* In all cases, it returns the async queue.
*/
static struct async_queue *serial_queue_async(struct object *obj, struct async *async, int type, int count)
{
struct serial *serial = (struct serial *)obj;
struct async_queue *q;
int timeout;
assert(obj->ops == &serial_ops);
switch(type)
{
case ASYNC_TYPE_READ:
q = &serial->read_q;
timeout = serial->readconst + serial->readmult*count;
break;
case ASYNC_TYPE_WAIT:
q = &serial->wait_q;
timeout = 0;
break;
case ASYNC_TYPE_WRITE:
q = &serial->write_q;
timeout = serial->writeconst + serial->writemult*count;
break;
default:
set_error(STATUS_INVALID_PARAMETER);
return NULL;
}
if(async)
{
if(!async->q)
{
async_add_timeout(async,timeout);
async_insert(q, async);
}
}
return q;
}
/* create a serial */
DECL_HANDLER(create_serial)
{
struct serial *serial;
reply->handle = 0;
if ((serial = create_serial( get_req_data(), get_req_data_size(), req->access, req->attributes )))
{
reply->handle = alloc_handle( current->process, serial, req->access, req->inherit );
release_object( serial );
}
}
DECL_HANDLER(get_serial_info)
{
struct serial *serial;
if ((serial = get_serial_obj( current->process, req->handle, 0 )))
{
/* timeouts */
reply->readinterval = serial->readinterval;
reply->readconst = serial->readconst;
reply->readmult = serial->readmult;
reply->writeconst = serial->writeconst;
reply->writemult = serial->writemult;
/* event mask */
reply->eventmask = serial->eventmask;
/* comm port error status */
reply->commerror = serial->commerror;
release_object( serial );
}
}
DECL_HANDLER(set_serial_info)
{
struct serial *serial;
if ((serial = get_serial_obj( current->process, req->handle, 0 )))
{
/* timeouts */
if(req->flags & SERIALINFO_SET_TIMEOUTS)
{
serial->readinterval = req->readinterval;
serial->readconst = req->readconst;
serial->readmult = req->readmult;
serial->writeconst = req->writeconst;
serial->writemult = req->writemult;
}
/* event mask */
if(req->flags & SERIALINFO_SET_MASK)
{
serial->eventmask = req->eventmask;
if(!serial->eventmask)
{
while(serial->wait_q.head)
{
async_notify(serial->wait_q.head, STATUS_SUCCESS);
destroy_async(serial->wait_q.head);
}
}
}
/* comm port error status */
if(req->flags & SERIALINFO_SET_ERROR)
{
serial->commerror = req->commerror;
}
release_object( serial );
}
}
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