server/serial.c

   1 /*
   2  * Server-side serial port communications management
   3  *
   4  * Copyright (C) 1998 Alexandre Julliard
   5  * Copyright (C) 2000,2001 Mike McCormack
   6  *
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include "config.h"
  24 #include "wine/port.h"
  25
  26 #include <assert.h>
  27 #include <fcntl.h>
  28 #include <stdarg.h>
  29 #include <stdio.h>
  30 #include <string.h>
  31 #include <stdlib.h>
  32 #include <sys/time.h>
  33 #include <sys/types.h>
  34 #include <time.h>
  35 #include <unistd.h>
  36 #ifdef HAVE_UTIME_H
  37 #include <utime.h>
  38 #endif
  39 #ifdef HAVE_TERMIOS_H
  40 #include <termios.h>
  41 #endif
  42 #ifdef HAVE_SYS_IOCTL_H
  43 #include <sys/ioctl.h>
  44 #endif
  45
  46 #include "winerror.h"
  47 #include "windef.h"
  48 #include "winbase.h"
  49 #include "winreg.h"
  50 #include "winternl.h"
  51
  52 #include "file.h"
  53 #include "handle.h"
  54 #include "thread.h"
  55 #include "request.h"
  56 #include "async.h"
  57
  58 static void serial_dump( struct object *obj, int verbose );
  59 static struct fd *serial_get_fd( struct object *obj );
  60 static void serial_destroy(struct object *obj);
  61
  62 static int serial_get_poll_events( struct fd *fd );
  63 static void serial_poll_event( struct fd *fd, int event );
  64 static int serial_get_info( struct fd *fd, int *flags );
  65 static int serial_flush( struct fd *fd, struct event **event );
  66 static void serial_queue_async(struct fd *fd, void *ptr, unsigned int status, int type, int count);
  67
  68 struct serial
  69 {
  70     struct object       obj;
  71     struct fd          *fd;
  72     unsigned int        options;
  73
  74     /* timeout values */
  75     unsigned int        readinterval;
  76     unsigned int        readconst;
  77     unsigned int        readmult;
  78     unsigned int        writeconst;
  79     unsigned int        writemult;
  80
  81     unsigned int        eventmask;
  82     unsigned int        commerror;
  83
  84     struct termios      original;
  85
  86     struct async_queue  read_q;
  87     struct async_queue  write_q;
  88     struct async_queue  wait_q;
  89
  90     /* FIXME: add dcb, comm status, handler module, sharing */
  91 };
  92
  93 static const struct object_ops serial_ops =
  94 {
  95     sizeof(struct serial),        /* size */
  96     serial_dump,                  /* dump */
  97     default_fd_add_queue,         /* add_queue */
  98     default_fd_remove_queue,      /* remove_queue */
  99     default_fd_signaled,          /* signaled */
 100     no_satisfied,                 /* satisfied */
 101     serial_get_fd,                /* get_fd */
 102     serial_destroy                /* destroy */
 103 };
 104
 105 static const struct fd_ops serial_fd_ops =
 106 {
 107     serial_get_poll_events,       /* get_poll_events */
 108     serial_poll_event,            /* poll_event */
 109     serial_flush,                 /* flush */
 110     serial_get_info,              /* get_file_info */
 111     serial_queue_async            /* queue_async */
 112 };
 113
 114 /* check if the given fd is a serial port */
 115 int is_serial_fd( struct fd *fd )
 116 {
 117     struct termios tios;
 118
 119     return !tcgetattr( get_unix_fd(fd), &tios );
 120 }
 121
 122 /* create a serial object for a given fd */
 123 struct object *create_serial( struct fd *fd, unsigned int options )
 124 {
 125     struct serial *serial;
 126     int unix_fd;
 127
 128     if ((unix_fd = dup( get_unix_fd(fd) )) == -1) return NULL;
 129
 130     /* set the fd back to blocking if necessary */
 131     if (options & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT))
 132         fcntl( unix_fd, F_SETFL, 0 );
 133
 134     if (!(serial = alloc_object( &serial_ops )))
 135     {
 136         close( unix_fd );
 137         return NULL;
 138     }
 139     serial->options      = options;
 140     serial->readinterval = 0;
 141     serial->readmult     = 0;
 142     serial->readconst    = 0;
 143     serial->writemult    = 0;
 144     serial->writeconst   = 0;
 145     serial->eventmask    = 0;
 146     serial->commerror    = 0;
 147     init_async_queue(&serial->read_q);
 148     init_async_queue(&serial->write_q);
 149     init_async_queue(&serial->wait_q);
 150     if (!(serial->fd = create_anonymous_fd( &serial_fd_ops, unix_fd, &serial->obj )))
 151     {
 152         release_object( serial );
 153         return NULL;
 154     }
 155     return &serial->obj;
 156 }
 157
 158 static struct fd *serial_get_fd( struct object *obj )
 159 {
 160     struct serial *serial = (struct serial *)obj;
 161     return (struct fd *)grab_object( serial->fd );
 162 }
 163
 164 static void serial_destroy( struct object *obj)
 165 {
 166     struct serial *serial = (struct serial *)obj;
 167
 168     destroy_async_queue(&serial->read_q);
 169     destroy_async_queue(&serial->write_q);
 170     destroy_async_queue(&serial->wait_q);
 171     if (serial->fd) release_object( serial->fd );
 172 }
 173
 174 static void serial_dump( struct object *obj, int verbose )
 175 {
 176     struct serial *serial = (struct serial *)obj;
 177     assert( obj->ops == &serial_ops );
 178     fprintf( stderr, "Port fd=%p mask=%x\n", serial->fd, serial->eventmask );
 179 }
 180
 181 static struct serial *get_serial_obj( struct process *process, obj_handle_t handle, unsigned int access )
 182 {
 183     return (struct serial *)get_handle_obj( process, handle, access, &serial_ops );
 184 }
 185
 186 static int serial_get_poll_events( struct fd *fd )
 187 {
 188     struct serial *serial = get_fd_user( fd );
 189     int events = 0;
 190     assert( serial->obj.ops == &serial_ops );
 191
 192     if(IS_READY(serial->read_q))
 193         events |= POLLIN;
 194     if(IS_READY(serial->write_q))
 195         events |= POLLOUT;
 196     if(IS_READY(serial->wait_q))
 197         events |= POLLIN;
 198
 199     /* fprintf(stderr,"poll events are %04x\n",events); */
 200
 201     return events;
 202 }
 203
 204 static int serial_get_info( struct fd *fd, int *flags )
 205 {
 206     struct serial *serial = get_fd_user( fd );
 207     assert( serial->obj.ops == &serial_ops );
 208
 209     *flags = 0;
 210     if (!(serial->options & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT)))
 211         *flags |= FD_FLAG_OVERLAPPED;
 212     else if(!((serial->readinterval == MAXDWORD) &&
 213               (serial->readmult == 0) && (serial->readconst == 0)) )
 214         *flags |= FD_FLAG_TIMEOUT;
 215
 216     return FD_TYPE_DEFAULT;
 217 }
 218
 219 static void serial_poll_event(struct fd *fd, int event)
 220 {
 221     struct serial *serial = get_fd_user( fd );
 222
 223     /* fprintf(stderr,"Poll event %02x\n",event); */
 224
 225     if(IS_READY(serial->read_q) && (POLLIN & event) )
 226         async_notify(serial->read_q.head,STATUS_ALERTED);
 227
 228     if(IS_READY(serial->write_q) && (POLLOUT & event) )
 229         async_notify(serial->write_q.head,STATUS_ALERTED);
 230
 231     if(IS_READY(serial->wait_q) && (POLLIN & event) )
 232         async_notify(serial->wait_q.head,STATUS_ALERTED);
 233
 234     set_fd_events( fd, serial_get_poll_events(fd) );
 235 }
 236
 237 static void serial_queue_async(struct fd *fd, void *ptr, unsigned int status, int type, int count)
 238 {
 239     struct serial *serial = get_fd_user( fd );
 240     struct async_queue *q;
 241     struct async *async;
 242     int timeout;
 243
 244     assert(serial->obj.ops == &serial_ops);
 245
 246     switch(type)
 247     {
 248     case ASYNC_TYPE_READ:
 249         q = &serial->read_q;
 250         timeout = serial->readconst + serial->readmult*count;
 251         break;
 252     case ASYNC_TYPE_WAIT:
 253         q = &serial->wait_q;
 254         timeout = 0;
 255         break;
 256     case ASYNC_TYPE_WRITE:
 257         q = &serial->write_q;
 258         timeout = serial->writeconst + serial->writemult*count;
 259         break;
 260     default:
 261         set_error(STATUS_INVALID_PARAMETER);
 262         return;
 263     }
 264
 265     async = find_async ( q, current, ptr );
 266
 267     if ( status == STATUS_PENDING )
 268     {
 269         int events;
 270
 271         if ( !async )
 272             async = create_async ( &serial->obj, current, ptr );
 273         if ( !async )
 274             return;
 275
 276         async->status = STATUS_PENDING;
 277         if(!async->q)
 278         {
 279             async_add_timeout(async,timeout);
 280             async_insert(q, async);
 281         }
 282
 283         /* Check if the new pending request can be served immediately */
 284         events = check_fd_events( fd, serial_get_poll_events( fd ) );
 285         if (events)
 286         {
 287             /* serial_poll_event() calls set_select_events() */
 288             serial_poll_event( fd, events );
 289             return;
 290         }
 291     }
 292     else if ( async ) destroy_async ( async );
 293     else set_error ( STATUS_INVALID_PARAMETER );
 294
 295     set_fd_events ( fd, serial_get_poll_events( fd ));
 296 }
 297
 298 static int serial_flush( struct fd *fd, struct event **event )
 299 {
 300     /* MSDN says: If hFile is a handle to a communications device,
 301      * the function only flushes the transmit buffer.
 302      */
 303     int ret = (tcflush( get_unix_fd(fd), TCOFLUSH ) != -1);
 304     if (!ret) file_set_error();
 305     return ret;
 306 }
 307
 308 DECL_HANDLER(get_serial_info)
 309 {
 310     struct serial *serial;
 311
 312     if ((serial = get_serial_obj( current->process, req->handle, 0 )))
 313     {
 314         /* timeouts */
 315         reply->readinterval = serial->readinterval;
 316         reply->readconst    = serial->readconst;
 317         reply->readmult     = serial->readmult;
 318         reply->writeconst   = serial->writeconst;
 319         reply->writemult    = serial->writemult;
 320
 321         /* event mask */
 322         reply->eventmask    = serial->eventmask;
 323
 324         /* comm port error status */
 325         reply->commerror    = serial->commerror;
 326
 327         release_object( serial );
 328     }
 329 }
 330
 331 DECL_HANDLER(set_serial_info)
 332 {
 333     struct serial *serial;
 334
 335     if ((serial = get_serial_obj( current->process, req->handle, 0 )))
 336     {
 337         /* timeouts */
 338         if(req->flags & SERIALINFO_SET_TIMEOUTS)
 339         {
 340             serial->readinterval = req->readinterval;
 341             serial->readconst    = req->readconst;
 342             serial->readmult     = req->readmult;
 343             serial->writeconst   = req->writeconst;
 344             serial->writemult    = req->writemult;
 345         }
 346
 347         /* event mask */
 348         if(req->flags & SERIALINFO_SET_MASK)
 349         {
 350             serial->eventmask = req->eventmask;
 351             if(!serial->eventmask)
 352             {
 353                 while(serial->wait_q.head)
 354                 {
 355                     async_notify(serial->wait_q.head, STATUS_SUCCESS);
 356                     destroy_async(serial->wait_q.head);
 357                 }
 358             }
 359         }
 360
 361         /* comm port error status */
 362         if(req->flags & SERIALINFO_SET_ERROR)
 363         {
 364             serial->commerror = req->commerror;
 365         }
 366
 367         release_object( serial );
 368     }
 369 }