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
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
|
/* dtable.cc: file descriptor support.
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. */
#define __INSIDE_CYGWIN_NET__
#include "winsup.h"
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <wchar.h>
#define USE_SYS_TYPES_FD_SET
#include <winsock.h>
#include "pinfo.h"
#include "cygerrno.h"
#include "perprocess.h"
#include "path.h"
#include "fhandler.h"
#include "select.h"
#include "dtable.h"
#include "cygheap.h"
#include "tls_pbuf.h"
#include "ntdll.h"
#include "shared_info.h"
static const DWORD std_consts[] = {STD_INPUT_HANDLE, STD_OUTPUT_HANDLE,
STD_ERROR_HANDLE};
static bool handle_to_fn (HANDLE, char *);
#define WCLEN(x) ((sizeof (x) / sizeof (WCHAR)) - 1)
static const char unknown_file[] = "some disk file";
static const WCHAR DEV_NULL[] = L"\\Device\\Null";
static const WCHAR DEV_SOCKET[] = L"\\Device\\Afd";
static const WCHAR DEVICE_PREFIX[] = L"\\device\\";
static const size_t DEVICE_PREFIX_LEN WCLEN (DEVICE_PREFIX);
static const WCHAR DEV_NAMED_PIPE[] = L"\\Device\\NamedPipe\\";
static const size_t DEV_NAMED_PIPE_LEN = WCLEN (DEV_NAMED_PIPE);
static const WCHAR DEV_REMOTE[] = L"\\Device\\LanmanRedirector\\";
static const size_t DEV_REMOTE_LEN = WCLEN (DEV_REMOTE);
static const WCHAR DEV_REMOTE1[] = L"\\Device\\WinDfs\\Root\\";
static const size_t DEV_REMOTE1_LEN = WCLEN (DEV_REMOTE1);
/* Set aside space for the table of fds */
void
dtable_init ()
{
if (!cygheap->fdtab.size)
cygheap->fdtab.extend (NOFILE_INCR, 0);
}
void __stdcall
set_std_handle (int fd)
{
fhandler_base *fh = cygheap->fdtab[fd];
if (fd == 0)
SetStdHandle (std_consts[fd], fh ? fh->get_handle () : NULL);
else if (fd <= 2)
SetStdHandle (std_consts[fd], fh ? fh->get_output_handle () : NULL);
}
int
dtable::extend (size_t howmuch, size_t min)
{
size_t new_size = size + howmuch;
fhandler_base **newfds;
if (new_size <= OPEN_MAX_MAX)
/* ok */;
else if (size < OPEN_MAX_MAX && min < OPEN_MAX_MAX)
new_size = OPEN_MAX_MAX;
else
{
set_errno (EMFILE);
return 0;
}
/* Try to allocate more space for fd table. We can't call realloc ()
here to preserve old table if memory allocation fails */
if (!(newfds = (fhandler_base **) ccalloc (HEAP_ARGV, new_size, sizeof newfds[0])))
{
debug_printf ("calloc failed");
set_errno (ENOMEM);
return 0;
}
if (fds)
{
memcpy (newfds, fds, size * sizeof (fds[0]));
cfree (fds);
}
size = new_size;
fds = newfds;
debug_printf ("size %ld, fds %p", size, fds);
return 1;
}
void
dtable::get_debugger_info ()
{
extern bool jit_debug;
if (!jit_debug && being_debugged ())
{
char std[3][sizeof ("/dev/ptyNNNN")];
std[0][0] = std[1][0] = std [2][0] = '\0';
char buf[sizeof ("cYgstd %x") + 64];
sprintf (buf, "cYgstd %p %zx %x", &std, sizeof (std[0]), 3);
OutputDebugString (buf);
for (int i = 0; i < 3; i++)
if (std[i][0])
{
HANDLE h = GetStdHandle (std_consts[i]);
fhandler_base *fh = build_fh_name (std[i]);
if (!fh)
continue;
fds[i] = fh;
if (!fh->open ((i ? (i == 2 ? O_RDWR : O_WRONLY) : O_RDONLY)
| O_BINARY, 0777))
release (i);
else
{
CloseHandle (h);
/* Copy to Windows' idea of a standard handle, otherwise
we have invalid standard handles when calling Windows
functions (small_printf and strace might suffer, too). */
SetStdHandle (std_consts[i], i ? fh->get_output_handle ()
: fh->get_handle ());
}
}
}
}
/* Initialize the file descriptor/handle mapping table.
This function should only be called when a cygwin function is invoked
by a non-cygwin function, i.e., it should only happen very rarely. */
void
dtable::stdio_init ()
{
if (myself->cygstarted || ISSTATE (myself, PID_CYGPARENT))
{
tty_min *t = cygwin_shared->tty.get_cttyp ();
if (t && t->is_console)
init_console_handler (true);
return;
}
HANDLE in = GetStdHandle (STD_INPUT_HANDLE);
HANDLE out = GetStdHandle (STD_OUTPUT_HANDLE);
HANDLE err = GetStdHandle (STD_ERROR_HANDLE);
init_std_file_from_handle (0, in);
/* STD_ERROR_HANDLE has been observed to be the same as
STD_OUTPUT_HANDLE. We need separate handles (e.g. using pipes
to pass data from child to parent). */
/* CV 2008-10-17: Under debugger control, std fd's have been potentially
initialized in dtable::get_debugger_info (). In this case
init_std_file_from_handle is a no-op, so, even if out == err we don't
want to duplicate the handle since it will be unused. */
if (out == err && (!being_debugged () || not_open (2)))
{
/* Since this code is not invoked for forked tasks, we don't have
to worry about the close-on-exec flag here. */
if (!DuplicateHandle (GetCurrentProcess (), out,
GetCurrentProcess (), &err,
0, TRUE, DUPLICATE_SAME_ACCESS))
{
/* If that fails, do this as a fall back. */
err = out;
system_printf ("couldn't make stderr distinct from stdout, %E");
}
}
init_std_file_from_handle (1, out);
init_std_file_from_handle (2, err);
}
const int dtable::initial_archetype_size;
fhandler_base *
dtable::find_archetype (device& dev)
{
for (unsigned i = 0; i < farchetype; i++)
if (archetypes[i]->get_device () == (dev_t) dev)
return archetypes[i];
return NULL;
}
fhandler_base **
dtable::add_archetype ()
{
if (farchetype++ >= narchetypes)
archetypes = (fhandler_base **) crealloc_abort (archetypes, (narchetypes += initial_archetype_size) * sizeof archetypes[0]);
return archetypes + farchetype - 1;
}
void
dtable::delete_archetype (fhandler_base *fh)
{
for (unsigned i = 0; i < farchetype; i++)
if (fh == archetypes[i])
{
debug_printf ("deleting element %d for %s(%d/%d)", i, fh->get_name (),
fh->dev ().get_major (), fh->dev ().get_minor ());
if (i < --farchetype)
archetypes[i] = archetypes[farchetype];
break;
}
delete fh;
}
int
dtable::find_unused_handle (size_t start)
{
/* When extending, try to allocate a NOFILE_INCR chunk
following the empty fd. */
size_t extendby = NOFILE_INCR + ((start >= size) ? 1 + start - size : 0);
/* This do loop should only ever execute twice. */
int res = -1;
do
{
for (size_t i = start; i < size; i++)
if (fds[i] == NULL)
{
res = (int) i;
goto out;
}
}
while (extend (extendby, start));
out:
return res;
}
void
dtable::release (int fd)
{
if (fds[fd]->need_fixup_before ())
dec_need_fixup_before ();
fds[fd]->dec_refcnt ();
fds[fd] = NULL;
if (fd <= 2)
set_std_handle (fd);
}
extern "C" int
cygwin_attach_handle_to_fd (char *name, int fd, HANDLE handle, mode_t bin,
DWORD myaccess)
{
cygheap->fdtab.lock ();
if (fd == -1)
fd = cygheap->fdtab.find_unused_handle ();
fhandler_base *fh = build_fh_name (name);
if (!fh)
fd = -1;
else
{
cygheap->fdtab[fd] = fh;
cygheap->fdtab[fd]->inc_refcnt ();
fh->init (handle, myaccess, bin ?: fh->pc_binmode ());
}
cygheap->fdtab.unlock ();
return fd;
}
void
dtable::init_std_file_from_handle (int fd, HANDLE handle)
{
tmp_pathbuf tp;
CONSOLE_SCREEN_BUFFER_INFO buf;
DCB dcb;
unsigned bin = O_BINARY;
device dev;
first_fd_for_open = 0;
if (!not_open (fd))
return;
SetLastError (0);
DWORD access = 0;
DWORD ft = GetFileType (handle);
char *name = tp.c_get ();
name[0] = '\0';
if (ft == FILE_TYPE_UNKNOWN && GetLastError () == ERROR_INVALID_HANDLE)
/* can't figure out what this is */;
else if (ft == FILE_TYPE_PIPE)
{
int rcv = 0, len = sizeof (int);
if (handle_to_fn (handle, name))
dev.parse (name);
else if (strcmp (name, ":sock:") == 0
/* NtQueryObject returns an error when called on an LSP socket
handle. fhandler_socket::set_socket_handle tries to fetch
the underlying base socket, but this might fail. */
|| (strcmp (name, unknown_file) == 0
&& !::getsockopt ((SOCKET) handle, SOL_SOCKET, SO_RCVBUF,
(char *) &rcv, &len)))
{
/* socket */
dev = *af_inet_dev;
name[0] = '\0';
}
else if (fd == 0)
dev = *piper_dev;
else
dev = *pipew_dev;
}
else if (GetConsoleScreenBufferInfo (handle, &buf)
|| GetNumberOfConsoleInputEvents (handle, (DWORD *) &buf))
{
/* Console I/O */
if (myself->ctty > 0)
dev.parse (myself->ctty);
else
{
dev.parse (FH_CONSOLE);
CloseHandle (handle);
handle = INVALID_HANDLE_VALUE;
}
}
else if (GetCommState (handle, &dcb))
/* FIXME: Not right - assumes ttyS0 */
dev.parse (DEV_SERIAL_MAJOR, 0);
else
/* Try to figure it out from context - probably a disk file */
handle_to_fn (handle, name);
if (!name[0] && !dev)
fds[fd] = NULL;
else
{
fhandler_base *fh;
if (dev)
fh = build_fh_dev (dev);
else
fh = build_fh_name (name);
if (!fh)
return;
if (name[0])
{
bin = fh->pc_binmode ();
if (!bin)
{
bin = fh->get_default_fmode (O_RDWR);
if (!bin && dev)
bin = O_BINARY;
}
}
IO_STATUS_BLOCK io;
FILE_ACCESS_INFORMATION fai;
int openflags = O_BINARY;
/* Console windows are no kernel objects up to Windows 7/2008R2, so the
access mask returned by NtQueryInformationFile is meaningless. CMD
always hands down stdin handles as R/O handles, but our tty slave
sides are R/W. */
if (fh->is_tty ())
{
openflags |= O_RDWR;
access |= GENERIC_READ | GENERIC_WRITE;
}
else if (!iscons_dev (dev)
&& NT_SUCCESS (NtQueryInformationFile (handle, &io, &fai,
sizeof fai,
FileAccessInformation)))
{
if (fai.AccessFlags & FILE_WRITE_DATA)
{
openflags |= O_WRONLY;
access |= GENERIC_WRITE;
}
if (fai.AccessFlags & FILE_READ_DATA)
{
openflags |= openflags & O_WRONLY ? O_RDWR : O_RDONLY;
access |= GENERIC_READ;
}
}
else if (fd == 0)
{
openflags |= O_RDONLY;
access |= GENERIC_READ;
}
else
{
openflags |= O_WRONLY;
access |= GENERIC_WRITE; /* Should be rdwr for stderr but not sure that's
possible for some versions of handles */
}
if (!fh->init (handle, access, bin))
api_fatal ("couldn't initialize fd %d for %s", fd, fh->get_name ());
fh->open_setup (openflags);
fh->usecount = 0;
cygheap->fdtab[fd] = fh;
cygheap->fdtab[fd]->inc_refcnt ();
set_std_handle (fd);
paranoid_printf ("fd %d, handle %p", fd, handle);
}
}
#define cnew(name, ...) \
({ \
void* ptr = (void*) ccalloc (HEAP_FHANDLER, 1, sizeof (name)); \
ptr ? new (ptr) name (__VA_ARGS__) : NULL; \
})
#define cnew_no_ctor(name, ...) \
({ \
void* ptr = (void*) ccalloc (HEAP_FHANDLER, 1, sizeof (name)); \
ptr ? new (ptr) name (ptr) : NULL; \
})
fhandler_base *
build_fh_name (const char *name, unsigned opt, suffix_info *si)
{
path_conv pc (name, opt | PC_NULLEMPTY | PC_POSIX, si);
if (pc.error)
{
fhandler_base *fh = cnew (fhandler_nodevice);
if (fh)
fh->set_error (pc.error);
set_errno (fh ? pc.error : EMFILE);
return fh;
}
return build_fh_pc (pc);
}
fhandler_base *
build_fh_dev (const device& dev, const char *unix_name)
{
path_conv pc (dev);
if (unix_name)
pc.set_posix (unix_name);
else
pc.set_posix (dev.name ());
return build_fh_pc (pc);
}
#define fh_unset ((fhandler_base *) 1)
static device last_tty_dev;
#define fh_last_tty_dev ((fhandler_termios *) cygheap->fdtab.find_archetype (last_tty_dev))
static fhandler_base *
fh_alloc (path_conv& pc)
{
fhandler_base *fh = fh_unset;
fhandler_base *fhraw = NULL;
switch (pc.dev.get_major ())
{
case DEV_PTYS_MAJOR:
fh = cnew (fhandler_pty_slave, pc.dev.get_minor ());
break;
case DEV_PTYM_MAJOR:
fh = cnew (fhandler_pty_master, pc.dev.get_minor ());
break;
case DEV_FLOPPY_MAJOR:
case DEV_CDROM_MAJOR:
case DEV_SD_MAJOR:
case DEV_SD1_MAJOR ... DEV_SD7_MAJOR:
case DEV_SD_HIGHPART_START ... DEV_SD_HIGHPART_END:
fh = cnew (fhandler_dev_floppy);
break;
case DEV_TAPE_MAJOR:
fh = cnew (fhandler_dev_tape);
break;
case DEV_SERIAL_MAJOR:
fh = cnew (fhandler_serial);
break;
case DEV_CONS_MAJOR:
fh = cnew (fhandler_console, pc.dev);
break;
default:
switch ((dev_t) pc.dev)
{
case FH_CONSOLE:
case FH_CONIN:
case FH_CONOUT:
fh = cnew (fhandler_console, pc.dev);
break;
case FH_PTMX:
if (pc.isopen ())
fh = cnew (fhandler_pty_master, -1);
else
fhraw = cnew_no_ctor (fhandler_pty_master, -1);
break;
case FH_WINDOWS:
fh = cnew (fhandler_windows);
break;
case FH_FIFO:
fh = cnew (fhandler_fifo);
break;
case FH_PIPE:
case FH_PIPER:
case FH_PIPEW:
fh = cnew (fhandler_pipe);
break;
case FH_INET:
fh = cnew (fhandler_socket_inet);
break;
case FH_LOCAL:
fh = cnew (fhandler_socket_local);
break;
#ifdef __WITH_AF_UNIX
case FH_UNIX:
fh = cnew (fhandler_socket_unix);
break;
#endif /* __WITH_AF_UNIX */
case FH_FS:
fh = cnew (fhandler_disk_file);
break;
case FH_NULL:
fh = cnew (fhandler_dev_null);
break;
case FH_ZERO:
case FH_FULL:
fh = cnew (fhandler_dev_zero);
break;
case FH_RANDOM:
case FH_URANDOM:
fh = cnew (fhandler_dev_random);
break;
case FH_CLIPBOARD:
fh = cnew (fhandler_dev_clipboard);
break;
case FH_OSS_DSP:
fh = cnew (fhandler_dev_dsp);
break;
case FH_PROC:
fh = cnew (fhandler_proc);
break;
case FH_REGISTRY:
fh = cnew (fhandler_registry);
break;
case FH_PROCESS:
fh = cnew (fhandler_process);
break;
case FH_PROCESSFD:
fh = cnew (fhandler_process_fd);
break;
case FH_PROCNET:
fh = cnew (fhandler_procnet);
break;
case FH_PROCSYS:
fh = cnew (fhandler_procsys);
break;
case FH_PROCSYSVIPC:
fh = cnew (fhandler_procsysvipc);
break;
case FH_NETDRIVE:
fh = cnew (fhandler_netdrive);
break;
case FH_DEV:
fh = cnew (fhandler_dev);
break;
case FH_CYGDRIVE:
fh = cnew (fhandler_cygdrive);
break;
case FH_SIGNALFD:
fh = cnew (fhandler_signalfd);
break;
case FH_TIMERFD:
fh = cnew (fhandler_timerfd);
break;
case FH_TTY:
if (!pc.isopen ())
{
fhraw = cnew_no_ctor (fhandler_console, -1);
debug_printf ("not called from open for /dev/tty");
}
else if (myself->ctty <= 0 && last_tty_dev
&& !myself->set_ctty (fh_last_tty_dev, 0))
debug_printf ("no /dev/tty assigned");
else if (myself->ctty > 0)
{
debug_printf ("determining /dev/tty assignment for ctty %p", myself->ctty);
if (iscons_dev (myself->ctty))
fh = cnew (fhandler_console, pc.dev);
else
fh = cnew (fhandler_pty_slave, myself->ctty);
if (fh->dev () != FH_NADA)
fh->set_name ("/dev/tty");
}
break;
}
}
/* If `fhraw' is set that means that this fhandler is just a dummy
set up for stat(). Mock it up for use by stat without actually
trying to do any real initialization. */
if (fhraw)
{
fh = fhraw;
fh->set_name (pc);
if (fh->use_archetype ())
fh->archetype = fh;
}
if (fh == fh_unset)
fh = cnew (fhandler_nodevice);
else if (fh->dev () == FH_ERROR)
{
if (!pc.isopen () && pc.dev.isfs ())
fh->dev () = pc.dev; /* Special case: This file actually exists on
disk and we're not trying to open it so just
return the info from pc. */
else
{
delete fh;
fh = NULL;
}
}
return fh;
}
fhandler_base *
build_fh_pc (path_conv& pc)
{
fhandler_base *fh = fh_alloc (pc);
if (!fh)
{
set_errno (ENXIO);
goto out;
}
if (!fh->use_archetype ())
fh->set_name (pc);
else if ((fh->archetype = cygheap->fdtab.find_archetype (fh->dev ())))
{
debug_printf ("found an archetype for %s(%d/%d) io_handle %p", fh->get_name (), fh->dev ().get_major (), fh->dev ().get_minor (),
fh->archetype->get_io_handle ());
if (!fh->get_name ())
fh->set_name (fh->archetype->dev ().name ());
}
else if (cygwin_finished_initializing && !pc.isopen ())
fh->set_name (pc);
else
{
if (!fh->get_name ())
fh->set_name (fh->dev ().native ());
fh->archetype = fh->clone ();
debug_printf ("created an archetype (%p) for %s(%d/%d)", fh->archetype, fh->get_name (), fh->dev ().get_major (), fh->dev ().get_minor ());
fh->archetype->archetype = NULL;
*cygheap->fdtab.add_archetype () = fh->archetype;
}
/* Keep track of the last tty-like thing opened. We could potentially want
to open it if /dev/tty is referenced. */
if (myself->ctty > 0 || !fh->is_tty () || !pc.isctty_capable ())
last_tty_dev = FH_NADA;
else
last_tty_dev = fh->dev ();
out:
debug_printf ("fh %p, dev %08x", fh, fh ? (dev_t) fh->dev () : 0);
return fh;
}
fhandler_base *
dtable::dup_worker (fhandler_base *oldfh, int flags)
{
/* Don't call set_name in build_fh_pc. It will be called in
fhandler_base::operator= below. Calling it twice will result
in double allocation. */
fhandler_base *newfh = oldfh->clone ();
if (!newfh)
debug_printf ("build_fh_pc failed");
else
{
if (!oldfh->archetype)
newfh->set_io_handle (NULL);
newfh->pc.reset_conv_handle ();
if (oldfh->dup (newfh, flags))
{
delete newfh;
newfh = NULL;
debug_printf ("oldfh->dup failed");
}
else
{
/* Don't increment refcnt here since we don't know if this is a
allocated fd. So we leave this chore to the caller. */
newfh->usecount = 0;
newfh->archetype_usecount (1);
/* The O_CLOEXEC flag enforces close-on-exec behaviour. */
newfh->set_close_on_exec (!!(flags & O_CLOEXEC));
debug_printf ("duped '%s' old %p, new %p", oldfh->get_name (),
oldfh->get_io_handle (), newfh->get_io_handle ());
}
}
return newfh;
}
int
dtable::dup3 (int oldfd, int newfd, int flags)
{
int res = -1;
fhandler_base *newfh = NULL; // = NULL to avoid an incorrect warning
debug_printf ("dup3 (%d, %d, %y)", oldfd, newfd, flags);
lock ();
bool do_unlock = true;
bool unlock_on_return;
if (!(flags & O_EXCL))
unlock_on_return = true; /* Relinquish lock on return */
else
{
flags &= ~O_EXCL;
unlock_on_return = false; /* Return with lock set on success */
}
if (not_open (oldfd))
{
syscall_printf ("fd %d not open", oldfd);
set_errno (EBADF);
goto done;
}
if (newfd >= OPEN_MAX_MAX || newfd < 0)
{
syscall_printf ("new fd out of bounds: %d", newfd);
set_errno (EBADF);
goto done;
}
if ((flags & ~O_CLOEXEC) != 0)
{
syscall_printf ("invalid flags value %y", flags);
set_errno (EINVAL);
return -1;
}
/* This is a temporary kludge until all utilities can catch up with
a change in behavior that implements linux functionality: opening
a tty should not automatically cause it to become the controlling
tty for the process. */
if (newfd > 2)
flags |= O_NOCTTY;
if ((newfh = dup_worker (fds[oldfd], flags)) == NULL)
{
res = -1;
goto done;
}
debug_printf ("newfh->io_handle %p, oldfh->io_handle %p, new win32_name %p, old win32_name %p",
newfh->get_io_handle (), fds[oldfd]->get_io_handle (), newfh->get_win32_name (), fds[oldfd]->get_win32_name ());
if (!not_open (newfd))
close (newfd);
else if ((size_t) newfd >= size
&& find_unused_handle (newfd) < 0)
/* couldn't extend fdtab */
{
newfh->close ();
res = -1;
goto done;
}
fds[newfd] = newfh;
if ((res = newfd) <= 2)
set_std_handle (res);
do_unlock = unlock_on_return;
done:
if (do_unlock)
unlock ();
syscall_printf ("%R = dup3(%d, %d, %y)", res, oldfd, newfd, flags);
return res;
}
bool
dtable::select_read (int fd, select_stuff *ss)
{
if (not_open (fd))
{
set_errno (EBADF);
return false;
}
fhandler_base *fh = fds[fd];
select_record *s = fh->select_read (ss);
s->fd = fd;
if (!s->fh)
s->fh = fh;
s->thread_errno = 0;
debug_printf ("%s fd %d", fh->get_name (), fd);
return true;
}
bool
dtable::select_write (int fd, select_stuff *ss)
{
if (not_open (fd))
{
set_errno (EBADF);
return NULL;
}
fhandler_base *fh = fds[fd];
select_record *s = fh->select_write (ss);
s->fd = fd;
s->fh = fh;
s->thread_errno = 0;
debug_printf ("%s fd %d", fh->get_name (), fd);
return true;
}
bool
dtable::select_except (int fd, select_stuff *ss)
{
if (not_open (fd))
{
set_errno (EBADF);
return NULL;
}
fhandler_base *fh = fds[fd];
select_record *s = fh->select_except (ss);
s->fd = fd;
s->fh = fh;
s->thread_errno = 0;
debug_printf ("%s fd %d", fh->get_name (), fd);
return true;
}
void
dtable::move_fd (int from, int to)
{
// close (to); /* It is assumed that this is close-on-exec */
fds[to] = fds[from];
fds[from] = NULL;
}
void
dtable::set_file_pointers_for_exec ()
{
/* This is not POSIX-compliant so the function is only called for
non-Cygwin processes. */
LONG off_high = 0;
lock ();
fhandler_base *fh;
for (size_t i = 0; i < size; i++)
if ((fh = fds[i]) != NULL && fh->get_flags () & O_APPEND)
SetFilePointer (fh->get_handle (), 0, &off_high, FILE_END);
unlock ();
}
void
dtable::fixup_close (size_t i, fhandler_base *fh)
{
if (fh->archetype)
{
debug_printf ("closing fd %d since it is an archetype", i);
fh->close_with_arch ();
}
release (i);
}
void
dtable::fixup_after_exec ()
{
first_fd_for_open = 0;
fhandler_base *fh;
for (size_t i = 0; i < size; i++)
if ((fh = fds[i]) != NULL)
{
fh->clear_readahead ();
fh->fixup_after_exec ();
/* Close the handle if it's close-on-exec or if an error was detected
(typically with opening a console in a gui app) by fixup_after_exec.
*/
if (fh->close_on_exec () || (!fh->nohandle () && !fh->get_io_handle ()))
fixup_close (i, fh);
else if (fh->get_popen_pid ())
close (i);
else if (i == 0)
SetStdHandle (std_consts[i], fh->get_io_handle ());
else if (i <= 2)
SetStdHandle (std_consts[i], fh->get_output_handle ());
}
}
void
dtable::fixup_after_fork (HANDLE parent)
{
fhandler_base *fh;
for (size_t i = 0; i < size; i++)
if ((fh = fds[i]) != NULL)
{
if (fh->close_on_exec () || fh->need_fork_fixup ())
{
debug_printf ("fd %d (%s)", i, fh->get_name ());
fh->fixup_after_fork (parent);
if (!fh->nohandle () && !fh->get_io_handle ())
{
/* This should actually never happen but it's here to make sure
we don't crash due to access of an unopened file handle. */
fixup_close (i, fh);
continue;
}
}
if (i == 0)
SetStdHandle (std_consts[i], fh->get_io_handle ());
else if (i <= 2)
SetStdHandle (std_consts[i], fh->get_output_handle ());
}
}
static void
decode_tty (char *buf, WCHAR *w32)
{
int ttyn = wcstol (w32, NULL, 10);
__ptsname (buf, ttyn);
}
/* Try to derive posix filename from given handle. Return true if
the handle is associated with a cygwin tty. */
static bool
handle_to_fn (HANDLE h, char *posix_fn)
{
tmp_pathbuf tp;
ULONG len = 0;
WCHAR *maxmatchdos = NULL;
PWCHAR device = tp.w_get ();
int maxmatchlen = 0;
OBJECT_NAME_INFORMATION *ntfn = (OBJECT_NAME_INFORMATION *) tp.w_get ();
NTSTATUS status = NtQueryObject (h, ObjectNameInformation, ntfn, 65536, &len);
if (!NT_SUCCESS (status))
debug_printf ("NtQueryObject failed, %y", status);
// NT seems to do this on an unopened file
else if (!ntfn->Name.Buffer)
debug_printf ("nt->Name.Buffer == NULL");
else
{
WCHAR *w32 = ntfn->Name.Buffer;
size_t w32len = ntfn->Name.Length / sizeof (WCHAR);
w32[w32len] = L'\0';
if (wcscasecmp (w32, DEV_NULL) == 0)
{
strcpy (posix_fn, "/dev/null");
return false;
}
if (wcscasecmp (w32, DEV_SOCKET) == 0)
{
strcpy (posix_fn, ":sock:");
return false;
}
if (wcsncasecmp (w32, DEV_NAMED_PIPE, DEV_NAMED_PIPE_LEN) == 0)
{
w32 += DEV_NAMED_PIPE_LEN;
if (wcsncmp (w32, L"cygwin-", WCLEN (L"cygwin-")) != 0)
return false;
w32 += WCLEN (L"cygwin-");
/* Check for installation key and trailing dash. */
w32len = cygheap->installation_key.Length / sizeof (WCHAR);
if (w32len
&& wcsncmp (w32, cygheap->installation_key.Buffer, w32len) != 0)
return false;
w32 += w32len;
if (*w32 != L'-')
return false;
++w32;
bool istty = wcsncmp (w32, L"pty", WCLEN (L"pty")) == 0;
if (istty)
decode_tty (posix_fn, w32 + WCLEN (L"pty"));
else if (wcsncmp (w32, L"pipe", WCLEN (L"pipe")) == 0)
strcpy (posix_fn, "/dev/pipe");
return istty;
}
WCHAR fnbuf[64 * 1024];
if (wcsncasecmp (w32, DEVICE_PREFIX, DEVICE_PREFIX_LEN) != 0
|| !QueryDosDeviceW (NULL, fnbuf, sizeof (fnbuf) / sizeof (WCHAR)))
{
sys_wcstombs (posix_fn, NT_MAX_PATH, w32, w32len);
return false;
}
for (WCHAR *s = fnbuf; *s; s = wcschr (s, '\0') + 1)
{
if (!QueryDosDeviceW (s, device, NT_MAX_PATH))
continue;
if (wcschr (s, ':') == NULL)
continue;
WCHAR *q = wcsrchr (device, ';');
if (q)
{
WCHAR *r = wcschr (q, '\\');
if (r)
wcscpy (q, r + 1);
}
int devlen = wcslen (device);
if (device[devlen - 1] == L'\\')
device[--devlen] = L'\0';
if (devlen < maxmatchlen)
continue;
if (wcsncmp (device, w32, devlen) != 0||
(w32[devlen] != L'\0' && w32[devlen] != L'\\'))
continue;
maxmatchlen = devlen;
maxmatchdos = s;
debug_printf ("current match '%W' = '%W'\n", s, device);
}
if (maxmatchlen)
{
WCHAR *p = wcschr (w32 + DEVICE_PREFIX_LEN, L'\\');
size_t n = wcslen (maxmatchdos);
WCHAR ch;
if (!p)
ch = L'\0';
else
{
if (maxmatchdos[n - 1] == L'\\')
n--;
w32 += maxmatchlen - n;
ch = L'\\';
}
memcpy (w32, maxmatchdos, n * sizeof (WCHAR));
w32[n] = ch;
}
else if (wcsncmp (w32, DEV_REMOTE, DEV_REMOTE_LEN) == 0)
{
w32 += DEV_REMOTE_LEN - 2;
*w32 = L'\\';
debug_printf ("remote drive");
}
else if (wcsncmp (w32, DEV_REMOTE1, DEV_REMOTE1_LEN) == 0)
{
w32 += DEV_REMOTE1_LEN - 2;
*w32 = L'\\';
debug_printf ("remote drive");
}
cygwin_conv_path (CCP_WIN_W_TO_POSIX | CCP_ABSOLUTE, w32, posix_fn,
NT_MAX_PATH);
debug_printf ("derived path '%W', posix '%s'", w32, posix_fn);
return false;
}
strcpy (posix_fn, unknown_file);
return false;
}
void
dtable::fixup_before_fork (DWORD target_proc_id)
{
lock ();
fhandler_base *fh;
for (size_t i = 0; i < size; i++)
if ((fh = fds[i]) != NULL)
{
debug_printf ("fd %d (%s)", i, fh->get_name ());
fh->fixup_before_fork_exec (target_proc_id);
}
unlock ();
}
void
dtable::fixup_before_exec (DWORD target_proc_id)
{
lock ();
fhandler_base *fh;
for (size_t i = 0; i < size; i++)
if ((fh = fds[i]) != NULL && !fh->close_on_exec ())
{
debug_printf ("fd %d (%s)", i, fh->get_name ());
fh->fixup_before_fork_exec (target_proc_id);
}
unlock ();
}
|