1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
|
/* fhandler_serial.cc
Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Red Hat, Inc.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include <unistd.h>
#include <stdlib.h>
#include "cygerrno.h"
#include "security.h"
#include "path.h"
#include "fhandler.h"
#include "sigproc.h"
#include "pinfo.h"
#include <sys/termios.h>
#include <ddk/ntddser.h>
/**********************************************************************/
/* fhandler_serial */
fhandler_serial::fhandler_serial ()
: fhandler_base (), vmin_ (0), vtime_ (0), pgrp_ (myself->pgid)
{
set_need_fork_fixup ();
}
void
fhandler_serial::overlapped_setup ()
{
memset (&io_status, 0, sizeof (io_status));
io_status.hEvent = CreateEvent (&sec_none_nih, TRUE, FALSE, NULL);
ProtectHandle (io_status.hEvent);
overlapped_armed = 0;
}
void
fhandler_serial::raw_read (void *ptr, size_t& ulen)
{
int tot;
DWORD n;
HANDLE w4[2];
size_t minchars = vmin_ ?: ulen;
w4[0] = io_status.hEvent;
w4[1] = signal_arrived;
debug_printf ("ulen %d, vmin_ %d, vtime_ %d, hEvent %p", ulen, vmin_, vtime_,
io_status.hEvent);
if (!overlapped_armed)
{
(void) SetCommMask (get_handle (), EV_RXCHAR);
ResetEvent (io_status.hEvent);
}
for (n = 0, tot = 0; ulen; ulen -= n, ptr = (char *) ptr + n)
{
COMSTAT st;
DWORD inq = 1;
n = 0;
if (!vtime_ && !vmin_)
inq = ulen;
else if (vtime_)
{
inq = ulen; // non-interruptible -- have to use kernel timeouts
// also note that this is not strictly correct.
// if vmin > ulen then things won't work right.
overlapped_armed = -1;
}
if (!ClearCommError (get_handle (), &ev, &st))
goto err;
else if (ev)
termios_printf ("error detected %x", ev);
else if (st.cbInQue)
inq = st.cbInQue;
else if (!overlapped_armed)
{
if ((size_t) tot >= minchars)
break;
else if (WaitCommEvent (get_handle (), &ev, &io_status))
{
debug_printf ("WaitCommEvent succeeded: ev %x", ev);
if (!ev)
continue;
}
else if (GetLastError () != ERROR_IO_PENDING)
goto err;
else
{
overlapped_armed = 1;
switch (WaitForMultipleObjects (2, w4, FALSE, INFINITE))
{
case WAIT_OBJECT_0:
if (!GetOverlappedResult (get_handle (), &io_status, &n, FALSE))
goto err;
debug_printf ("n %d, ev %x", n, ev);
break;
case WAIT_OBJECT_0 + 1:
tot = -1;
PurgeComm (get_handle (), PURGE_RXABORT);
overlapped_armed = 0;
set_sig_errno (EINTR);
goto out;
default:
goto err;
}
}
}
overlapped_armed = 0;
ResetEvent (io_status.hEvent);
if (inq > ulen)
inq = ulen;
debug_printf ("inq %d", inq);
if (ReadFile (get_handle (), ptr, min (inq, ulen), &n, &io_status))
/* Got something */;
else if (GetLastError () != ERROR_IO_PENDING)
goto err;
else if (!GetOverlappedResult (get_handle (), &io_status, &n, TRUE))
goto err;
tot += n;
debug_printf ("vtime_ %d, vmin_ %d, n %d, tot %d", vtime_, vmin_, n, tot);
if (vtime_ || !vmin_ || !n)
break;
continue;
err:
PurgeComm (get_handle (), PURGE_RXABORT);
debug_printf ("err %E");
if (GetLastError () == ERROR_OPERATION_ABORTED)
n = 0;
else
{
tot = -1;
__seterrno ();
break;
}
}
out:
ulen = tot;
}
/* Cover function to WriteFile to provide Posix interface and semantics
(as much as possible). */
int
fhandler_serial::raw_write (const void *ptr, size_t len)
{
DWORD bytes_written;
OVERLAPPED write_status;
memset (&write_status, 0, sizeof (write_status));
write_status.hEvent = CreateEvent (&sec_none_nih, TRUE, FALSE, NULL);
ProtectHandle (write_status.hEvent);
for (;;)
{
if (WriteFile (get_handle (), ptr, len, &bytes_written, &write_status))
break;
switch (GetLastError ())
{
case ERROR_OPERATION_ABORTED:
continue;
case ERROR_IO_PENDING:
break;
default:
goto err;
}
if (!GetOverlappedResult (get_handle (), &write_status, &bytes_written, TRUE))
goto err;
break;
}
ForceCloseHandle (write_status.hEvent);
return bytes_written;
err:
__seterrno ();
ForceCloseHandle (write_status.hEvent);
return -1;
}
void
fhandler_serial::dump (void)
{
paranoid_printf ("here");
}
void
fhandler_serial::init (HANDLE f, DWORD flags, mode_t bin)
{
(void) open (flags, bin & (O_BINARY | O_TEXT));
}
int
fhandler_serial::open (int flags, mode_t mode)
{
int res;
COMMTIMEOUTS to;
extern BOOL reset_com;
syscall_printf ("fhandler_serial::open (%s, %p, %p)",
get_name (), flags, mode);
if (!fhandler_base::open (flags, mode))
return 0;
res = 1;
(void) SetCommMask (get_handle (), EV_RXCHAR);
set_r_no_interrupt (1); // Handled explicitly in read code
overlapped_setup ();
memset (&to, 0, sizeof (to));
(void) SetCommTimeouts (get_handle (), &to);
/* Reset serial port to known state of 9600-8-1-no flow control
on open for better behavior under Win 95.
FIXME: This should only be done when explicitly opening the com
port. It should not be reset if an fd is inherited.
Using __progname in this way, to determine how far along in the
initialization we are, is really a terrible kludge and should
be fixed ASAP.
*/
extern char *__progname;
if (reset_com && __progname)
{
DCB state;
GetCommState (get_handle (), &state);
syscall_printf ("setting initial state on %s (reset_com %d)",
get_name (), reset_com);
state.BaudRate = CBR_9600;
state.ByteSize = 8;
state.StopBits = ONESTOPBIT;
state.Parity = NOPARITY; /* FIXME: correct default? */
state.fBinary = TRUE; /* binary xfer */
state.EofChar = 0; /* no end-of-data in binary mode */
state.fNull = FALSE; /* don't discard nulls in binary mode */
state.fParity = FALSE; /* ignore parity errors */
state.fErrorChar = FALSE;
state.fTXContinueOnXoff = TRUE; /* separate TX and RX flow control */
state.fOutX = FALSE; /* disable transmission flow control */
state.fInX = FALSE; /* disable reception flow control */
state.XonChar = 0x11;
state.XoffChar = 0x13;
state.fOutxDsrFlow = FALSE; /* disable DSR flow control */
state.fRtsControl = RTS_CONTROL_ENABLE; /* ignore lead control except
DTR */
state.fOutxCtsFlow = FALSE; /* disable output flow control */
state.fDtrControl = DTR_CONTROL_ENABLE; /* assert DTR */
state.fDsrSensitivity = FALSE; /* don't assert DSR */
state.fAbortOnError = TRUE;
if (!SetCommState (get_handle (), &state))
system_printf ("couldn't set initial state for %s, %E", get_name ());
}
/* setting rts and dtr to known state so that ioctl() function with
request TIOCMGET could return correct value of RTS and DTR lines.
Important only for Win 9x systems */
if (!wincap.supports_reading_modem_output_lines ())
{
if (EscapeCommFunction (get_handle (), SETDTR) == 0)
system_printf ("couldn't set initial state of DTR for %s, %E", get_name ());
if (EscapeCommFunction (get_handle (), SETRTS) == 0)
system_printf ("couldn't set initial state of RTS for %s, %E", get_name ());
/* even though one of above functions fail I have to set rts and dtr
variables to initial value. */
rts = TIOCM_RTS;
dtr = TIOCM_DTR;
}
SetCommMask (get_handle (), EV_RXCHAR);
set_open_status ();
syscall_printf ("%p = fhandler_serial::open (%s, %p, %p)",
res, get_name (), flags, mode);
return res;
}
int
fhandler_serial::close ()
{
(void) ForceCloseHandle (io_status.hEvent);
return fhandler_base::close ();
}
/* tcsendbreak: POSIX 7.2.2.1 */
/* Break for 250-500 milliseconds if duration == 0 */
/* Otherwise, units for duration are undefined */
int
fhandler_serial::tcsendbreak (int duration)
{
unsigned int sleeptime = 300000;
if (duration > 0)
sleeptime *= duration;
if (SetCommBreak (get_handle ()) == 0)
return -1;
/* FIXME: need to send zero bits during duration */
usleep (sleeptime);
if (ClearCommBreak (get_handle ()) == 0)
return -1;
syscall_printf ("0 = fhandler_serial:tcsendbreak (%d)", duration);
return 0;
}
/* tcdrain: POSIX 7.2.2.1 */
int
fhandler_serial::tcdrain (void)
{
if (FlushFileBuffers (get_handle ()) == 0)
return -1;
return 0;
}
/* tcflow: POSIX 7.2.2.1 */
int
fhandler_serial::tcflow (int action)
{
DWORD win32action = 0;
DCB dcb;
char xchar;
termios_printf ("action %d", action);
switch (action)
{
case TCOOFF:
win32action = SETXOFF;
break;
case TCOON:
win32action = SETXON;
break;
case TCION:
case TCIOFF:
if (GetCommState (get_handle (), &dcb) == 0)
return -1;
if (action == TCION)
xchar = (dcb.XonChar ? dcb.XonChar : 0x11);
else
xchar = (dcb.XoffChar ? dcb.XoffChar : 0x13);
if (TransmitCommChar (get_handle (), xchar) == 0)
return -1;
return 0;
break;
default:
return -1;
break;
}
if (EscapeCommFunction (get_handle (), win32action) == 0)
return -1;
return 0;
}
/* ioctl: */
int
fhandler_serial::ioctl (unsigned int cmd, void *buffer)
{
int res = 0;
# define ibuffer ((int) buffer)
# define ipbuffer (*(int *) buffer)
DWORD ev;
COMSTAT st;
if (!ClearCommError (get_handle (), &ev, &st))
{
__seterrno ();
res = -1;
}
else
switch (cmd)
{
case TCFLSH:
res = tcflush (ibuffer);
break;
case TIOCMGET:
DWORD modem_lines;
if (!GetCommModemStatus (get_handle (), &modem_lines))
{
__seterrno ();
res = -1;
}
else
{
ipbuffer = 0;
if (modem_lines & MS_CTS_ON)
ipbuffer |= TIOCM_CTS;
if (modem_lines & MS_DSR_ON)
ipbuffer |= TIOCM_DSR;
if (modem_lines & MS_RING_ON)
ipbuffer |= TIOCM_RI;
if (modem_lines & MS_RLSD_ON)
ipbuffer |= TIOCM_CD;
DWORD cb;
DWORD mcr;
if (!DeviceIoControl (get_handle (), IOCTL_SERIAL_GET_DTRRTS,
NULL, 0, &mcr, 4, &cb, 0) || cb != 4)
ipbuffer |= rts | dtr;
else
{
if (mcr & 2)
ipbuffer |= TIOCM_RTS;
if (mcr & 1)
ipbuffer |= TIOCM_DTR;
}
}
break;
case TIOCMSET:
if (ipbuffer & TIOCM_RTS)
{
if (EscapeCommFunction (get_handle (), SETRTS))
rts = TIOCM_RTS;
else
{
__seterrno ();
res = -1;
}
}
else
{
if (EscapeCommFunction (get_handle (), CLRRTS))
rts = 0;
else
{
__seterrno ();
res = -1;
}
}
if (ipbuffer & TIOCM_DTR)
{
if (EscapeCommFunction (get_handle (), SETDTR))
dtr = TIOCM_DTR;
else
{
__seterrno ();
res = -1;
}
}
else if (EscapeCommFunction (get_handle (), CLRDTR))
dtr = 0;
else
{
__seterrno ();
res = -1;
}
break;
case TIOCINQ:
if (ev & CE_FRAME || ev & CE_IOE || ev & CE_OVERRUN || ev & CE_RXOVER
|| ev & CE_RXPARITY)
{
set_errno (EINVAL); /* FIXME: Use correct errno */
res = -1;
}
else
ipbuffer = st.cbInQue;
break;
default:
set_errno (ENOSYS);
res = -1;
break;
}
termios_printf ("%d = ioctl (%p, %p)", res, cmd, buffer);
# undef ibuffer
# undef ipbuffer
return res;
}
/* tcflush: POSIX 7.2.2.1 */
int
fhandler_serial::tcflush (int queue)
{
if (queue == TCOFLUSH || queue == TCIOFLUSH)
PurgeComm (get_handle (), PURGE_TXABORT | PURGE_TXCLEAR);
if (queue == TCIFLUSH || queue == TCIOFLUSH)
/* Input flushing by polling until nothing turns up
(we stop after 1000 chars anyway) */
for (int max = 1000; max > 0; max--)
{
COMSTAT st;
if (!PurgeComm (get_handle (), PURGE_RXABORT | PURGE_RXCLEAR))
break;
low_priority_sleep (100);
if (!ClearCommError (get_handle (), &ev, &st) || !st.cbInQue)
break;
}
return 0;
}
/* tcsetattr: POSIX 7.2.1.1 */
int
fhandler_serial::tcsetattr (int action, const struct termios *t)
{
/* Possible actions:
TCSANOW: immediately change attributes.
TCSADRAIN: flush output, then change attributes.
TCSAFLUSH: flush output and discard input, then change attributes.
*/
bool dropDTR = false;
COMMTIMEOUTS to;
DCB ostate, state;
unsigned int ovtime = vtime_, ovmin = vmin_;
int tmpDtr, tmpRts, res;
res = tmpDtr = tmpRts = 0;
termios_printf ("action %d", action);
if ((action == TCSADRAIN) || (action == TCSAFLUSH))
{
FlushFileBuffers (get_handle ());
termios_printf ("flushed file buffers");
}
if (action == TCSAFLUSH)
PurgeComm (get_handle (), (PURGE_RXABORT | PURGE_RXCLEAR));
/* get default/last comm state */
if (!GetCommState (get_handle (), &ostate))
return -1;
state = ostate;
/* -------------- Set baud rate ------------------ */
/* FIXME: WIN32 also has 14400, 56000, 128000, and 256000.
Unix also has 230400. */
switch (t->c_ospeed)
{
case B0:
/* Drop DTR - but leave DCB-resident bitrate as-is since
0 is an invalid bitrate in Win32 */
dropDTR = true;
break;
case B110:
state.BaudRate = CBR_110;
break;
case B300:
state.BaudRate = CBR_300;
break;
case B600:
state.BaudRate = CBR_600;
break;
case B1200:
state.BaudRate = CBR_1200;
break;
case B2400:
state.BaudRate = CBR_2400;
break;
case B4800:
state.BaudRate = CBR_4800;
break;
case B9600:
state.BaudRate = CBR_9600;
break;
case B19200:
state.BaudRate = CBR_19200;
break;
case B38400:
state.BaudRate = CBR_38400;
break;
case B57600:
state.BaudRate = CBR_57600;
break;
case B115200:
state.BaudRate = CBR_115200;
break;
case B230400:
state.BaudRate = 230400 /* CBR_230400 - not defined */;
break;
default:
/* Unsupported baud rate! */
termios_printf ("Invalid t->c_ospeed %d", t->c_ospeed);
set_errno (EINVAL);
return -1;
}
/* -------------- Set byte size ------------------ */
switch (t->c_cflag & CSIZE)
{
case CS5:
state.ByteSize = 5;
break;
case CS6:
state.ByteSize = 6;
break;
case CS7:
state.ByteSize = 7;
break;
case CS8:
state.ByteSize = 8;
break;
default:
/* Unsupported byte size! */
termios_printf ("Invalid t->c_cflag byte size %d",
t->c_cflag & CSIZE);
set_errno (EINVAL);
return -1;
}
/* -------------- Set stop bits ------------------ */
if (t->c_cflag & CSTOPB)
state.StopBits = TWOSTOPBITS;
else
state.StopBits = ONESTOPBIT;
/* -------------- Set parity ------------------ */
if (t->c_cflag & PARENB)
state.Parity = (t->c_cflag & PARODD) ? ODDPARITY : EVENPARITY;
else
state.Parity = NOPARITY;
state.fBinary = TRUE; /* Binary transfer */
state.EofChar = 0; /* No end-of-data in binary mode */
state.fNull = FALSE; /* Don't discard nulls in binary mode */
/* -------------- Parity errors ------------------ */
/* fParity combines the function of INPCK and NOT IGNPAR */
if ((t->c_iflag & INPCK) && !(t->c_iflag & IGNPAR))
state.fParity = TRUE; /* detect parity errors */
else
state.fParity = FALSE; /* ignore parity errors */
/* Only present in Win32, Unix has no equivalent */
state.fErrorChar = FALSE;
state.ErrorChar = 0;
/* -------------- Set software flow control ------------------ */
/* Set fTXContinueOnXoff to FALSE. This prevents the triggering of a
premature XON when the remote device interprets a received character
as XON (same as IXANY on the remote side). Otherwise, a TRUE
value separates the TX and RX functions. */
state.fTXContinueOnXoff = TRUE; /* separate TX and RX flow control */
/* Transmission flow control */
if (t->c_iflag & IXON)
state.fOutX = TRUE; /* enable */
else
state.fOutX = FALSE; /* disable */
/* Reception flow control */
if (t->c_iflag & IXOFF)
state.fInX = TRUE; /* enable */
else
state.fInX = FALSE; /* disable */
/* XoffLim and XonLim are left at default values */
state.XonChar = (t->c_cc[VSTART] ? t->c_cc[VSTART] : 0x11);
state.XoffChar = (t->c_cc[VSTOP] ? t->c_cc[VSTOP] : 0x13);
/* -------------- Set hardware flow control ------------------ */
/* Disable DSR flow control */
state.fOutxDsrFlow = FALSE;
/* Some old flavors of Unix automatically enabled hardware flow
control when software flow control was not enabled. Since newer
Unices tend to require explicit setting of hardware flow-control,
this is what we do. */
/* RTS/CTS flow control */
if (t->c_cflag & CRTSCTS)
{ /* enable */
state.fOutxCtsFlow = TRUE;
state.fRtsControl = RTS_CONTROL_HANDSHAKE;
}
else
{ /* disable */
state.fRtsControl = RTS_CONTROL_ENABLE;
state.fOutxCtsFlow = FALSE;
tmpRts = TIOCM_RTS;
}
if (t->c_cflag & CRTSXOFF)
state.fRtsControl = RTS_CONTROL_HANDSHAKE;
/* -------------- DTR ------------------ */
/* Assert DTR on device open */
state.fDtrControl = DTR_CONTROL_ENABLE;
/* -------------- DSR ------------------ */
/* Assert DSR at the device? */
if (t->c_cflag & CLOCAL)
state.fDsrSensitivity = FALSE; /* no */
else
state.fDsrSensitivity = TRUE; /* yes */
/* -------------- Error handling ------------------ */
/* Since read/write operations terminate upon error, we
will use ClearCommError() to resume. */
state.fAbortOnError = TRUE;
if ((memcmp (&ostate, &state, sizeof (state)) != 0)
&& !SetCommState (get_handle (), &state))
{
/* SetCommState() failed, usually due to invalid DCB param.
Keep track of this so we can set errno to EINVAL later
and return failure */
termios_printf ("SetCommState() failed, %E");
__seterrno ();
res = -1;
}
set_r_binary ((t->c_iflag & IGNCR) ? 0 : 1);
set_w_binary ((t->c_oflag & ONLCR) ? 0 : 1);
if (dropDTR)
{
EscapeCommFunction (get_handle (), CLRDTR);
tmpDtr = 0;
}
else
{
/* FIXME: Sometimes when CLRDTR is set, setting
state.fDtrControl = DTR_CONTROL_ENABLE will fail. This
is a problem since a program might want to change some
parameters while DTR is still down. */
EscapeCommFunction (get_handle (), SETDTR);
tmpDtr = TIOCM_DTR;
}
rts = tmpRts;
dtr = tmpDtr;
/* The following documentation on was taken from "Linux Serial Programming
HOWTO". It explains how MIN (t->c_cc[VMIN] || vmin_) and TIME
(t->c_cc[VTIME] || vtime_) is to be used.
In non-canonical input processing mode, input is not assembled into
lines and input processing (erase, kill, delete, etc.) does not
occur. Two parameters control the behavior of this mode: c_cc[VTIME]
sets the character timer, and c_cc[VMIN] sets the minimum number of
characters to receive before satisfying the read.
If MIN > 0 and TIME = 0, MIN sets the number of characters to receive
before the read is satisfied. As TIME is zero, the timer is not used.
If MIN = 0 and TIME > 0, TIME serves as a timeout value. The read will
be satisfied if a single character is read, or TIME is exceeded (t =
TIME *0.1 s). If TIME is exceeded, no character will be returned.
If MIN > 0 and TIME > 0, TIME serves as an inter-character timer. The
read will be satisfied if MIN characters are received, or the time
between two characters exceeds TIME. The timer is restarted every time
a character is received and only becomes active after the first
character has been received.
If MIN = 0 and TIME = 0, read will be satisfied immediately. The
number of characters currently available, or the number of characters
requested will be returned. According to Antonino (see contributions),
you could issue a fcntl(fd, F_SETFL, FNDELAY); before reading to get
the same result.
*/
if (t->c_lflag & ICANON)
{
vmin_ = 0;
vtime_ = 0;
}
else
{
vtime_ = t->c_cc[VTIME] * 100;
vmin_ = t->c_cc[VMIN];
}
debug_printf ("vtime %d, vmin %d", vtime_, vmin_);
if (ovmin != vmin_ || ovtime != vtime_)
{
memset (&to, 0, sizeof (to));
if ((vmin_ > 0) && (vtime_ == 0))
{
/* Returns immediately with whatever is in buffer on a ReadFile();
or blocks if nothing found. We will keep calling ReadFile(); until
vmin_ characters are read */
to.ReadIntervalTimeout = to.ReadTotalTimeoutMultiplier = MAXDWORD;
to.ReadTotalTimeoutConstant = MAXDWORD - 1;
}
else if ((vmin_ == 0) && (vtime_ > 0))
{
/* set timeoout constant appropriately and we will only try to
read one character in ReadFile() */
to.ReadTotalTimeoutConstant = vtime_;
to.ReadIntervalTimeout = to.ReadTotalTimeoutMultiplier = MAXDWORD;
}
else if ((vmin_ > 0) && (vtime_ > 0))
{
/* time applies to the interval time for this case */
to.ReadIntervalTimeout = vtime_;
}
else if ((vmin_ == 0) && (vtime_ == 0))
{
/* returns immediately with whatever is in buffer as per
Time-Outs docs in Win32 SDK API docs */
to.ReadIntervalTimeout = MAXDWORD;
}
debug_printf ("ReadTotalTimeoutConstant %d, ReadIntervalTimeout %d, ReadTotalTimeoutMultiplier %d",
to.ReadTotalTimeoutConstant, to.ReadIntervalTimeout, to.ReadTotalTimeoutMultiplier);
if (!SetCommTimeouts(get_handle (), &to))
{
/* SetCommTimeouts() failed. Keep track of this so we
can set errno to EINVAL later and return failure */
termios_printf ("SetCommTimeouts() failed, %E");
__seterrno ();
res = -1;
}
}
return res;
}
/* tcgetattr: POSIX 7.2.1.1 */
int
fhandler_serial::tcgetattr (struct termios *t)
{
DCB state;
/* Get current Win32 comm state */
if (GetCommState (get_handle (), &state) == 0)
return -1;
/* for safety */
memset (t, 0, sizeof (*t));
/* -------------- Baud rate ------------------ */
/* If DTR is NOT set, return B0 as our speed */
if (dtr != TIOCM_DTR)
t->c_cflag = t->c_ospeed = t->c_ispeed = B0;
else
switch (state.BaudRate)
{
case CBR_110:
t->c_cflag = t->c_ospeed = t->c_ispeed = B110;
break;
case CBR_300:
t->c_cflag = t->c_ospeed = t->c_ispeed = B300;
break;
case CBR_600:
t->c_cflag = t->c_ospeed = t->c_ispeed = B600;
break;
case CBR_1200:
t->c_cflag = t->c_ospeed = t->c_ispeed = B1200;
break;
case CBR_2400:
t->c_cflag = t->c_ospeed = t->c_ispeed = B2400;
break;
case CBR_4800:
t->c_cflag = t->c_ospeed = t->c_ispeed = B4800;
break;
case CBR_9600:
t->c_cflag = t->c_ospeed = t->c_ispeed = B9600;
break;
case CBR_19200:
t->c_cflag = t->c_ospeed = t->c_ispeed = B19200;
break;
case CBR_38400:
t->c_cflag = t->c_ospeed = t->c_ispeed = B38400;
break;
case CBR_57600:
t->c_cflag = t->c_ospeed = t->c_ispeed = B57600;
break;
case CBR_115200:
t->c_cflag = t->c_ospeed = t->c_ispeed = B115200;
break;
case 230400: /* CBR_230400 - not defined */
t->c_cflag = t->c_ospeed = t->c_ispeed = B230400;
break;
default:
/* Unsupported baud rate! */
termios_printf ("Invalid baud rate %d", state.BaudRate);
set_errno (EINVAL);
return -1;
}
/* -------------- Byte size ------------------ */
switch (state.ByteSize)
{
case 5:
t->c_cflag |= CS5;
break;
case 6:
t->c_cflag |= CS6;
break;
case 7:
t->c_cflag |= CS7;
break;
case 8:
t->c_cflag |= CS8;
break;
default:
/* Unsupported byte size! */
termios_printf ("Invalid byte size %d", state.ByteSize);
set_errno (EINVAL);
return -1;
}
/* -------------- Stop bits ------------------ */
if (state.StopBits == TWOSTOPBITS)
t->c_cflag |= CSTOPB;
/* -------------- Parity ------------------ */
if (state.Parity == ODDPARITY)
t->c_cflag |= (PARENB | PARODD);
if (state.Parity == EVENPARITY)
t->c_cflag |= PARENB;
/* -------------- Parity errors ------------------ */
/* fParity combines the function of INPCK and NOT IGNPAR */
if (state.fParity)
t->c_iflag |= INPCK;
else
t->c_iflag |= IGNPAR; /* not necessarily! */
/* -------------- Software flow control ------------------ */
/* transmission flow control */
if (state.fOutX)
t->c_iflag |= IXON;
/* reception flow control */
if (state.fInX)
t->c_iflag |= IXOFF;
t->c_cc[VSTART] = (state.XonChar ? state.XonChar : 0x11);
t->c_cc[VSTOP] = (state.XoffChar ? state.XoffChar : 0x13);
/* -------------- Hardware flow control ------------------ */
/* Some old flavors of Unix automatically enabled hardware flow
control when software flow control was not enabled. Since newer
Unices tend to require explicit setting of hardware flow-control,
this is what we do. */
/* Input flow-control */
if ((state.fRtsControl == RTS_CONTROL_HANDSHAKE) && state.fOutxCtsFlow)
t->c_cflag |= CRTSCTS;
if (state.fRtsControl == RTS_CONTROL_HANDSHAKE)
t->c_cflag |= CRTSXOFF;
/* -------------- CLOCAL --------------- */
/* DSR is only lead toggled only by CLOCAL. Check it to see if
CLOCAL was called. */
/* FIXME: If tcsetattr() hasn't been called previously, this may
give a false CLOCAL. */
if (!state.fDsrSensitivity)
t->c_cflag |= CLOCAL;
/* FIXME: need to handle IGNCR */
#if 0
if (!get_r_binary ())
t->c_iflag |= IGNCR;
#endif
if (!get_w_binary ())
t->c_oflag |= ONLCR;
t->c_cc[VTIME] = vtime_ / 100;
t->c_cc[VMIN] = vmin_;
debug_printf ("vmin_ %d, vtime_ %d", vmin_, vtime_);
return 0;
}
void
fhandler_serial::fixup_after_fork (HANDLE parent)
{
if (get_close_on_exec ())
fhandler_base::fixup_after_fork (parent);
overlapped_setup ();
debug_printf ("io_status.hEvent %p", io_status.hEvent);
}
void
fhandler_serial::fixup_after_exec (HANDLE)
{
overlapped_setup ();
debug_printf ("io_status.hEvent %p", io_status.hEvent);
return;
}
int
fhandler_serial::dup (fhandler_base *child)
{
fhandler_serial *fhc = (fhandler_serial *) child;
overlapped_setup ();
fhc->vmin_ = vmin_;
fhc->vtime_ = vtime_;
return fhandler_base::dup (child);
}
|