forked from Alexpux/Cygwin
-
Notifications
You must be signed in to change notification settings - Fork 32
/
spawn.cc
1450 lines (1296 loc) · 40.7 KB
/
spawn.cc
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
/* spawn.cc
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 <stdlib.h>
#include <unistd.h>
#include <process.h>
#include <sys/wait.h>
#include <wchar.h>
#include <ctype.h>
#include <sys/cygwin.h>
#include "cygerrno.h"
#include "security.h"
#include "sigproc.h"
#include "pinfo.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "child_info.h"
#include "environ.h"
#include "cygtls.h"
#include "tls_pbuf.h"
#include "winf.h"
#include "ntdll.h"
static const suffix_info exe_suffixes[] =
{
suffix_info ("", 1),
suffix_info (".exe", 1),
suffix_info (".com"),
suffix_info (NULL)
};
/* Add .exe to PROG if not already present and see if that exists.
If not, return PROG (converted from posix to win32 rules if necessary).
The result is always BUF.
Returns (possibly NULL) suffix */
static const char *
perhaps_suffix (const char *prog, path_conv& buf, int& err, unsigned opt)
{
const char *ext;
err = 0;
debug_printf ("prog '%s'", prog);
buf.check (prog, PC_SYM_FOLLOW | PC_SYM_NOFOLLOW_REP | PC_NULLEMPTY | PC_POSIX,
(opt & FE_DLL) ? stat_suffixes : exe_suffixes);
if (buf.isdir ())
{
err = EACCES;
ext = NULL;
}
else if (!buf.exists ())
{
err = ENOENT;
ext = NULL;
}
else if (buf.known_suffix ())
ext = buf.get_win32 () + (buf.known_suffix () - buf.get_win32 ());
else
ext = strchr (buf.get_win32 (), '\0');
debug_printf ("buf %s, suffix found '%s'", (char *) buf.get_win32 (), ext);
return ext;
}
/* Find an executable name, possibly by appending known executable suffixes
to it. The path_conv struct 'buf' is filled and contains both, win32 and
posix path of the target file. Any found suffix is returned in known_suffix.
Eventually the posix path in buf is overwritten with the exact path as it
gets constructed for the path search. The reason is that the path is used
to create argv[0] in av::setup, and this requires that the filename stays
intact, instead of being resolved if the file is a symlink.
If the file is not found and !FE_NNF then the POSIX version of name is
placed in buf and returned. Otherwise the contents of buf is undefined
and NULL is returned. */
const char * __reg3
find_exec (const char *name, path_conv& buf, const char *search,
unsigned opt, const char **known_suffix)
{
const char *suffix = "";
const char *retval = NULL;
tmp_pathbuf tp;
char *tmp_path;
char *tmp = tp.c_get ();
bool has_slash = !!strpbrk (name, "/\\");
int err = 0;
debug_printf ("find_exec (%s)", name);
/* Check to see if file can be opened as is first. */
if ((has_slash || opt & FE_CWD)
&& (suffix = perhaps_suffix (name, buf, err, opt)) != NULL)
{
/* Overwrite potential symlink target with original path.
See comment preceeding this method. */
tmp_path = tmp;
if (!has_slash)
tmp_path = stpcpy (tmp, "./");
stpcpy (tmp_path, name);
buf.set_posix (tmp);
retval = buf.get_posix ();
goto out;
}
const char *path;
/* If it starts with a slash, it's a PATH-like pathlist. Otherwise it's
the name of an environment variable. */
if (strchr (search, '/'))
*stpncpy (tmp, search, NT_MAX_PATH - 1) = '\0';
else if (has_slash || isdrive (name) || !(path = getenv (search)) || !*path)
goto errout;
else
*stpncpy (tmp, path, NT_MAX_PATH - 1) = '\0';
path = tmp;
debug_printf ("searchpath %s", path);
tmp_path = tp.c_get ();
do
{
char *eotmp = strccpy (tmp_path, &path, ':');
/* An empty path or '.' means the current directory, but we've
already tried that. */
if ((opt & FE_CWD) && (tmp_path[0] == '\0'
|| (tmp_path[0] == '.' && tmp_path[1] == '\0')))
continue;
*eotmp++ = '/';
stpcpy (eotmp, name);
debug_printf ("trying %s", tmp_path);
int err1;
if ((suffix = perhaps_suffix (tmp_path, buf, err1, opt)) != NULL)
{
if (buf.has_acls () && check_file_access (buf, X_OK, true))
continue;
/* Overwrite potential symlink target with original path.
See comment preceeding this method. */
buf.set_posix (tmp_path);
retval = buf.get_posix ();
goto out;
}
}
while (*path && *++path);
errout:
/* Couldn't find anything in the given path.
Take the appropriate action based on FE_NNF. */
if (!(opt & FE_NNF))
{
buf.check (name, PC_SYM_FOLLOW | PC_POSIX);
retval = buf.get_posix ();
}
out:
debug_printf ("%s = find_exec (%s)", (char *) buf.get_posix (), name);
if (known_suffix)
*known_suffix = suffix ?: strchr (buf.get_win32 (), '\0');
if (!retval && err)
set_errno (err);
return retval;
}
/* Utility for child_info_spawn::worker. */
static HANDLE
handle (int fd, bool writing, bool iscygwin)
{
HANDLE h;
cygheap_fdget cfd (fd);
if (cfd < 0)
h = INVALID_HANDLE_VALUE;
else if (cfd->close_on_exec ())
h = INVALID_HANDLE_VALUE;
else if (!writing)
h = cfd->get_handle ();
else if (cfd->get_major () == DEV_PTYS_MAJOR && iscygwin)
{
fhandler_pty_slave *ptys = (fhandler_pty_slave *)(fhandler_base *) cfd;
h = ptys->get_output_handle_cyg ();
}
else
h = cfd->get_output_handle ();
return h;
}
int
iscmd (const char *argv0, const char *what)
{
int n;
n = strlen (argv0) - strlen (what);
if (n >= 2 && argv0[1] != ':')
return 0;
return n >= 0 && strcasematch (argv0 + n, what) &&
(n == 0 || isdirsep (argv0[n - 1]));
}
#define ILLEGAL_SIG_FUNC_PTR ((_sig_func_ptr) (-2))
struct system_call_handle
{
_sig_func_ptr oldint;
_sig_func_ptr oldquit;
sigset_t oldmask;
bool is_system_call ()
{
return oldint != ILLEGAL_SIG_FUNC_PTR;
}
system_call_handle (bool issystem)
{
if (!issystem)
oldint = ILLEGAL_SIG_FUNC_PTR;
else
{
sig_send (NULL, __SIGHOLD);
oldint = NULL;
}
}
void arm()
{
if (is_system_call ())
{
sigset_t child_block;
oldint = signal (SIGINT, SIG_IGN);
oldquit = signal (SIGQUIT, SIG_IGN);
sigemptyset (&child_block);
sigaddset (&child_block, SIGCHLD);
sigprocmask (SIG_BLOCK, &child_block, &oldmask);
sig_send (NULL, __SIGNOHOLD);
}
}
~system_call_handle ()
{
if (is_system_call ())
{
signal (SIGINT, oldint);
signal (SIGQUIT, oldquit);
sigprocmask (SIG_SETMASK, &oldmask, NULL);
}
}
# undef cleanup
};
child_info_spawn NO_COPY ch_spawn;
extern "C" void __posix_spawn_sem_release (void *sem, int error);
int
child_info_spawn::worker (const char *prog_arg, const char *const *argv,
const char *const envp[], int mode,
int in__stdin, int in__stdout)
{
bool rc;
int res = -1;
DWORD pid_restore = 0;
bool attach_to_console = false;
pid_t ctty_pgid = 0;
/* Search for CTTY and retrieve its PGID */
cygheap_fdenum cfd (false);
while (cfd.next () >= 0)
if (cfd->get_major () == DEV_PTYS_MAJOR ||
cfd->get_major () == DEV_CONS_MAJOR)
{
fhandler_termios *fh = (fhandler_termios *) (fhandler_base *) cfd;
if (fh->tc ()->ntty == myself->ctty)
{
ctty_pgid = fh->tc ()->getpgid ();
break;
}
}
/* Environment variable MSYS2_ARG_CONV_EXCL contains a list
of ';' separated argument prefixes to pass un-modified.
A value of * means don't convert any arguments. */
char* msys2_arg_conv_excl_env = getenv("MSYS2_ARG_CONV_EXCL");
char* msys2_arg_conv_excl = NULL;
size_t msys2_arg_conv_excl_count = 0;
if (msys2_arg_conv_excl_env)
{
msys2_arg_conv_excl = (char*)alloca (strlen(msys2_arg_conv_excl_env)+1);
strcpy (msys2_arg_conv_excl, msys2_arg_conv_excl_env);
msys2_arg_conv_excl_count = string_split_delimited (msys2_arg_conv_excl, ';');
}
/* Check if we have been called from exec{lv}p or spawn{lv}p and mask
mode to keep only the spawn mode. */
bool p_type_exec = !!(mode & _P_PATH_TYPE_EXEC);
mode = _P_MODE (mode);
if (prog_arg == NULL)
{
syscall_printf ("prog_arg is NULL");
set_errno (EFAULT); /* As on Linux. */
return -1;
}
if (!prog_arg[0])
{
syscall_printf ("prog_arg is empty");
set_errno (ENOENT); /* Per POSIX */
return -1;
}
syscall_printf ("mode = %d, prog_arg = %.9500s", mode, prog_arg);
/* FIXME: This is no error condition on Linux. */
if (argv == NULL)
{
syscall_printf ("argv is NULL");
set_errno (EINVAL);
return -1;
}
av newargv;
linebuf cmd;
PWCHAR envblock = NULL;
path_conv real_path;
bool reset_sendsig = false;
tmp_pathbuf tp;
PWCHAR runpath = tp.w_get ();
int c_flags;
bool null_app_name = false;
STARTUPINFOW si = {};
int looped = 0;
system_call_handle system_call (mode == _P_SYSTEM);
__try
{
child_info_types chtype;
if (mode == _P_OVERLAY)
chtype = _CH_EXEC;
else
chtype = _CH_SPAWN;
moreinfo = cygheap_exec_info::alloc ();
/* CreateProcess takes one long string that is the command line (sigh).
We need to quote any argument that has whitespace or embedded "'s. */
int ac;
for (ac = 0; argv[ac]; ac++)
/* nothing */;
int err;
const char *ext;
if ((ext = perhaps_suffix (prog_arg, real_path, err, FE_NADA)) == NULL)
{
set_errno (err);
res = -1;
__leave;
}
res = newargv.setup (prog_arg, real_path, ext, ac, argv, p_type_exec);
if (res)
__leave;
if (!real_path.iscygexec () && ::cygheap->cwd.get_error ())
{
small_printf ("Error: Current working directory %s.\n"
"Can't start native Windows application from here.\n\n",
::cygheap->cwd.get_error_desc ());
set_errno (::cygheap->cwd.get_error ());
res = -1;
__leave;
}
if (ac == 3 && argv[1][0] == '/' && tolower (argv[1][1]) == 'c' &&
(iscmd (argv[0], "command.com") || iscmd (argv[0], "cmd.exe")))
{
real_path.check (prog_arg);
cmd.add ("\"");
if (!real_path.error)
cmd.add (real_path.get_win32 ());
else
cmd.add (argv[0]);
cmd.add ("\"");
cmd.add (" ");
cmd.add (argv[1]);
cmd.add (" ");
cmd.add (argv[2]);
real_path.set_path (argv[0]);
null_app_name = true;
}
else
{
if (real_path.iscygexec ())
{
moreinfo->argc = newargv.argc;
moreinfo->argv = newargv;
}
else
{
for (int i = 0; i < newargv.argc; i++)
{
//convert argv to win32
int newargvlen = strlen (newargv[i]);
char *tmpbuf = (char *)malloc (newargvlen + 1);
memcpy (tmpbuf, newargv[i], newargvlen + 1);
tmpbuf = arg_heuristic_with_exclusions(tmpbuf, msys2_arg_conv_excl, msys2_arg_conv_excl_count);
debug_printf("newargv[%d] = %s", i, newargv[i]);
newargv.replace (i, tmpbuf);
free (tmpbuf);
}
}
if ((wincmdln || !real_path.iscygexec ())
&& !cmd.fromargv (newargv, real_path.get_win32 (),
real_path.iscygexec ()))
{
res = -1;
__leave;
}
if (mode != _P_OVERLAY || !real_path.iscygexec ()
|| !DuplicateHandle (GetCurrentProcess (), myself.shared_handle (),
GetCurrentProcess (), &moreinfo->myself_pinfo,
0, TRUE, DUPLICATE_SAME_ACCESS))
moreinfo->myself_pinfo = NULL;
else
VerifyHandle (moreinfo->myself_pinfo);
}
PROCESS_INFORMATION pi;
pi.hProcess = pi.hThread = NULL;
pi.dwProcessId = pi.dwThreadId = 0;
c_flags = GetPriorityClass (GetCurrentProcess ());
sigproc_printf ("priority class %d", c_flags);
c_flags |= CREATE_SEPARATE_WOW_VDM | CREATE_UNICODE_ENVIRONMENT;
/* We're adding the CREATE_BREAKAWAY_FROM_JOB flag here to workaround
issues with the "Program Compatibility Assistant (PCA) Service".
For some reason, when starting long running sessions from mintty(*),
the affected svchost.exe process takes more and more memory and at one
point takes over the CPU. At this point the machine becomes
unresponsive. The only way to get back to normal is to stop the
entire mintty session, or to stop the PCA service. However, a process
which is controlled by PCA is part of a compatibility job, which
allows child processes to break away from the job. This helps to
avoid this issue.
First we call IsProcessInJob. It fetches the information whether or
not we're part of a job 20 times faster than QueryInformationJobObject.
(*) Note that this is not mintty's fault. It has just been observed
with mintty in the first place. See the archives for more info:
http://cygwin.com/ml/cygwin-developers/2012-02/msg00018.html */
JOBOBJECT_BASIC_LIMIT_INFORMATION jobinfo;
BOOL is_in_job;
if (IsProcessInJob (GetCurrentProcess (), NULL, &is_in_job)
&& is_in_job
&& QueryInformationJobObject (NULL, JobObjectBasicLimitInformation,
&jobinfo, sizeof jobinfo, NULL)
&& (jobinfo.LimitFlags & (JOB_OBJECT_LIMIT_BREAKAWAY_OK
| JOB_OBJECT_LIMIT_SILENT_BREAKAWAY_OK)))
{
debug_printf ("Add CREATE_BREAKAWAY_FROM_JOB");
c_flags |= CREATE_BREAKAWAY_FROM_JOB;
}
if (mode == _P_DETACH)
c_flags |= DETACHED_PROCESS;
else
fhandler_console::need_invisible ();
if (mode != _P_OVERLAY)
myself->exec_sendsig = NULL;
else
{
/* Reset sendsig so that any process which wants to send a signal
to this pid will wait for the new process to become active.
Save the old value in case the exec fails. */
if (!myself->exec_sendsig)
{
myself->exec_sendsig = myself->sendsig;
myself->exec_dwProcessId = myself->dwProcessId;
myself->sendsig = NULL;
reset_sendsig = true;
}
}
if (null_app_name)
runpath = NULL;
else
{
USHORT len = real_path.get_nt_native_path ()->Length / sizeof (WCHAR);
if (RtlEqualUnicodePathPrefix (real_path.get_nt_native_path (),
&ro_u_natp, FALSE))
{
runpath = real_path.get_wide_win32_path (runpath);
/* If the executable path length is < MAX_PATH, make sure the long
path win32 prefix is removed from the path to make subsequent
not long path aware native Win32 child processes happy. */
if (len < MAX_PATH + 4)
{
if (runpath[5] == ':')
runpath += 4;
else if (len < MAX_PATH + 6)
*(runpath += 6) = L'\\';
}
}
else if (len < NT_MAX_PATH - ro_u_globalroot.Length / sizeof (WCHAR))
{
UNICODE_STRING rpath;
RtlInitEmptyUnicodeString (&rpath, runpath,
(NT_MAX_PATH - 1) * sizeof (WCHAR));
RtlCopyUnicodeString (&rpath, &ro_u_globalroot);
RtlAppendUnicodeStringToString (&rpath,
real_path.get_nt_native_path ());
}
else
{
set_errno (ENAMETOOLONG);
res = -1;
__leave;
}
}
cygbench ("spawn-worker");
if (!real_path.iscygexec())
::cygheap->fdtab.set_file_pointers_for_exec ();
/* If we switch the user, merge the user's Windows environment. */
bool switch_user = ::cygheap->user.issetuid ()
&& (::cygheap->user.saved_uid
!= ::cygheap->user.real_uid);
bool keep_posix = (iscmd (argv[0], "strace.exe")
|| iscmd (argv[0], "strace")) ? true : real_path.iscygexec ();
moreinfo->envp = build_env (envp, envblock, moreinfo->envc,
real_path.iscygexec (),
switch_user ? ::cygheap->user.primary_token ()
: NULL,
keep_posix);
if (!moreinfo->envp || !envblock)
{
set_errno (E2BIG);
res = -1;
__leave;
}
set (chtype, real_path.iscygexec ());
__stdin = in__stdin;
__stdout = in__stdout;
record_children ();
si.lpReserved2 = (LPBYTE) this;
si.cbReserved2 = sizeof (*this);
/* Depends on set call above.
Some file types might need extra effort in the parent after CreateProcess
and before copying the datastructures to the child. So we have to start
the child in suspend state, unfortunately, to avoid a race condition. */
if (!newargv.win16_exe
&& (!iscygwin () || mode != _P_OVERLAY
|| ::cygheap->fdtab.need_fixup_before ()))
c_flags |= CREATE_SUSPENDED;
/* If a native application should be spawned, we test here if the spawning
process is running in a console and, if so, if it's a foreground or
background process. If it's a background process, we start the native
process with the CREATE_NEW_PROCESS_GROUP flag set. This lets the native
process ignore Ctrl-C by default. If we don't do that, pressing Ctrl-C
in a console will break native processes running in the background,
because the Ctrl-C event is sent to all processes in the console, unless
they ignore it explicitely. CREATE_NEW_PROCESS_GROUP does that for us. */
if (!iscygwin () && ctty_pgid && ctty_pgid != myself->pgid)
c_flags |= CREATE_NEW_PROCESS_GROUP;
refresh_cygheap ();
if (mode == _P_DETACH)
/* all set */;
else if (mode != _P_OVERLAY || !my_wr_proc_pipe)
prefork ();
else
wr_proc_pipe = my_wr_proc_pipe;
/* Don't allow child to inherit these handles if it's not a Cygwin program.
wr_proc_pipe will be injected later. parent won't be used by the child
so there is no reason for the child to have it open as it can confuse
ps into thinking that children of windows processes are all part of
the same "execed" process.
FIXME: Someday, make it so that parent is never created when starting
non-Cygwin processes. */
if (!iscygwin ())
{
SetHandleInformation (wr_proc_pipe, HANDLE_FLAG_INHERIT, 0);
SetHandleInformation (parent, HANDLE_FLAG_INHERIT, 0);
}
/* FIXME: racy */
if (mode != _P_OVERLAY)
SetHandleInformation (my_wr_proc_pipe, HANDLE_FLAG_INHERIT, 0);
parent_winpid = GetCurrentProcessId ();
PSECURITY_ATTRIBUTES sa = (PSECURITY_ATTRIBUTES) tp.w_get ();
if (!sec_user_nih (sa, cygheap->user.sid (),
well_known_authenticated_users_sid,
PROCESS_QUERY_LIMITED_INFORMATION))
sa = &sec_none_nih;
/* Attach to pseudo console if pty salve is used */
pid_restore = fhandler_console::get_console_process_id
(GetCurrentProcessId (), false);
for (int i = 0; i < 3; i ++)
{
const int chk_order[] = {1, 0, 2};
int fd = chk_order[i];
fhandler_base *fh = ::cygheap->fdtab[fd];
if (fh && fh->get_major () == DEV_PTYS_MAJOR)
{
fhandler_pty_slave *ptys = (fhandler_pty_slave *) fh;
if (ptys->get_pseudo_console ())
{
DWORD helper_process_id = ptys->get_helper_process_id ();
debug_printf ("found a PTY slave %d: helper_PID=%d",
fh->get_minor (), helper_process_id);
if (fhandler_console::get_console_process_id
(helper_process_id, true))
/* Already attached */
attach_to_console = true;
else if (!attach_to_console)
{
FreeConsole ();
if (AttachConsole (helper_process_id))
attach_to_console = true;
}
ptys->fixup_after_attach (!iscygwin (), fd);
if (mode == _P_OVERLAY)
ptys->set_freeconsole_on_close (iscygwin ());
}
}
else if (fh && fh->get_major () == DEV_CONS_MAJOR)
{
attach_to_console = true;
fhandler_console *cons = (fhandler_console *) fh;
if (wincap.has_con_24bit_colors () && !iscygwin ())
if (fd == 1 || fd == 2)
cons->request_xterm_mode_output (false);
}
}
if (!iscygwin ())
{
cfd.rewind ();
while (cfd.next () >= 0)
if (cfd->get_major () == DEV_PTYS_MAJOR)
{
fhandler_pty_slave *ptys =
(fhandler_pty_slave *)(fhandler_base *) cfd;
ptys->setup_locale ();
}
}
/* Set up needed handles for stdio */
si.dwFlags = STARTF_USESTDHANDLES;
si.hStdInput = handle ((in__stdin < 0 ? 0 : in__stdin), false,
iscygwin ());
si.hStdOutput = handle ((in__stdout < 0 ? 1 : in__stdout), true,
iscygwin ());
si.hStdError = handle (2, true, iscygwin ());
si.cb = sizeof (si);
if (!iscygwin ())
init_console_handler (myself->ctty > 0);
loop:
/* When ruid != euid we create the new process under the current original
account and impersonate in child, this way maintaining the different
effective vs. real ids.
FIXME: If ruid != euid and ruid != saved_uid we currently give
up on ruid. The new process will have ruid == euid. */
::cygheap->user.deimpersonate ();
if (!real_path.iscygexec () && mode == _P_OVERLAY)
myself->process_state |= PID_NOTCYGWIN;
cygpid = (mode != _P_OVERLAY) ? create_cygwin_pid () : myself->pid;
wchar_t wcmd[(size_t) cmd];
if (!::cygheap->user.issetuid ()
|| (::cygheap->user.saved_uid == ::cygheap->user.real_uid
&& ::cygheap->user.saved_gid == ::cygheap->user.real_gid
&& !::cygheap->user.groups.issetgroups ()
&& !::cygheap->user.setuid_to_restricted))
{
rc = CreateProcessW (runpath, /* image name w/ full path */
cmd.wcs (wcmd), /* what was passed to exec */
sa, /* process security attrs */
sa, /* thread security attrs */
TRUE, /* inherit handles */
c_flags,
envblock, /* environment */
NULL,
&si,
&pi);
}
else
{
/* Give access to myself */
if (mode == _P_OVERLAY)
myself.set_acl();
HWINSTA hwst = NULL;
HWINSTA hwst_orig = GetProcessWindowStation ();
HDESK hdsk = NULL;
HDESK hdsk_orig = GetThreadDesktop (GetCurrentThreadId ());
/* Don't create WindowStation and Desktop for restricted child. */
if (!::cygheap->user.setuid_to_restricted)
{
PSECURITY_ATTRIBUTES sa;
WCHAR sid[128];
WCHAR wstname[1024] = { L'\0' };
sa = sec_user ((PSECURITY_ATTRIBUTES) alloca (1024),
::cygheap->user.sid ());
/* We're creating a window station per user, not per logon
session First of all we might not have a valid logon session
for the user (logon by create_token), and second, it doesn't
make sense in terms of security to create a new window
station for every logon of the same user. It just fills up
the system with window stations for no good reason. */
hwst = CreateWindowStationW (::cygheap->user.get_windows_id (sid),
0, GENERIC_READ | GENERIC_WRITE, sa);
if (!hwst)
system_printf ("CreateWindowStation failed, %E");
else if (!SetProcessWindowStation (hwst))
system_printf ("SetProcessWindowStation failed, %E");
else if (!(hdsk = CreateDesktopW (L"Default", NULL, NULL, 0,
GENERIC_ALL, sa)))
system_printf ("CreateDesktop failed, %E");
else
{
wcpcpy (wcpcpy (wstname, sid), L"\\Default");
si.lpDesktop = wstname;
debug_printf ("Desktop: %W", si.lpDesktop);
}
}
rc = CreateProcessAsUserW (::cygheap->user.primary_token (),
runpath, /* image name w/ full path */
cmd.wcs (wcmd), /* what was passed to exec */
sa, /* process security attrs */
sa, /* thread security attrs */
TRUE, /* inherit handles */
c_flags,
envblock, /* environment */
NULL,
&si,
&pi);
if (hwst)
{
SetProcessWindowStation (hwst_orig);
CloseWindowStation (hwst);
}
if (hdsk)
{
SetThreadDesktop (hdsk_orig);
CloseDesktop (hdsk);
}
}
if (mode != _P_OVERLAY)
SetHandleInformation (my_wr_proc_pipe, HANDLE_FLAG_INHERIT,
HANDLE_FLAG_INHERIT);
/* Set errno now so that debugging messages from it appear before our
final debugging message [this is a general rule for debugging
messages]. */
if (!rc)
{
__seterrno ();
syscall_printf ("CreateProcess failed, %E");
/* If this was a failed exec, restore the saved sendsig. */
if (reset_sendsig)
{
myself->sendsig = myself->exec_sendsig;
myself->exec_sendsig = NULL;
}
myself->process_state &= ~PID_NOTCYGWIN;
/* Reset handle inheritance to default when the execution of a'
non-Cygwin process fails. Only need to do this for _P_OVERLAY
since the handle will be closed otherwise. Don't need to do
this for 'parent' since it will be closed in every case.
See FIXME above. */
if (!iscygwin () && mode == _P_OVERLAY)
SetHandleInformation (wr_proc_pipe, HANDLE_FLAG_INHERIT,
HANDLE_FLAG_INHERIT);
if (wr_proc_pipe == my_wr_proc_pipe)
wr_proc_pipe = NULL; /* We still own it: don't nuke in destructor */
/* Restore impersonation. In case of _P_OVERLAY this isn't
allowed since it would overwrite child data. */
if (mode != _P_OVERLAY)
::cygheap->user.reimpersonate ();
res = -1;
__leave;
}
/* The CREATE_SUSPENDED case is handled below */
if (iscygwin () && !(c_flags & CREATE_SUSPENDED))
strace.write_childpid (pi.dwProcessId);
/* Fixup the parent data structures if needed and resume the child's
main thread. */
if (::cygheap->fdtab.need_fixup_before ())
::cygheap->fdtab.fixup_before_exec (pi.dwProcessId);
/* Print the original program name here so the user can see that too. */
syscall_printf ("pid %d, prog_arg %s, cmd line %.9500s)",
rc ? cygpid : (unsigned int) -1, prog_arg, (const char *) cmd);
/* Name the handle similarly to proc_subproc. */
ProtectHandle1 (pi.hProcess, childhProc);
if (mode == _P_OVERLAY)
{
myself->dwProcessId = pi.dwProcessId;
strace.execing = 1;
myself.hProcess = hExeced = pi.hProcess;
HANDLE old_winpid_hdl = myself.shared_winpid_handle ();
if (!real_path.iscygexec ())
{
/* If the child process is not a Cygwin process, we have to
create a new winpid symlink on behalf of the child process
not being able to do this by itself. */
myself.create_winpid_symlink ();
}
NtClose (old_winpid_hdl);
real_path.get_wide_win32_path (myself->progname); // FIXME: race?
sigproc_printf ("new process name %W", myself->progname);
if (!iscygwin ())
close_all_files ();
}
else
{
myself->set_has_pgid_children ();
ProtectHandle (pi.hThread);
pinfo child (cygpid,
PID_IN_USE | (real_path.iscygexec () ? 0 : PID_NOTCYGWIN));
if (!child)
{
syscall_printf ("pinfo failed");
if (get_errno () != ENOMEM)
set_errno (EAGAIN);
res = -1;
__leave;
}
child->dwProcessId = pi.dwProcessId;
child.hProcess = pi.hProcess;
real_path.get_wide_win32_path (child->progname);
/* This introduces an unreferenced, open handle into the child.
The purpose is to keep the pid shared memory open so that all
of the fields filled out by child.remember do not disappear
and so there is not a brief period during which the pid is
not available. */
DuplicateHandle (GetCurrentProcess (), child.shared_handle (),
pi.hProcess, NULL, 0, 0, DUPLICATE_SAME_ACCESS);
if (!real_path.iscygexec ())
{
/* If the child process is not a Cygwin process, we have to
create a new winpid symlink and induce it into the child
process as well to keep it over the lifetime of the child. */
child.create_winpid_symlink ();
DuplicateHandle (GetCurrentProcess (),
child.shared_winpid_handle (),
pi.hProcess, NULL, 0, 0, DUPLICATE_SAME_ACCESS);
}
child->start_time = time (NULL); /* Register child's starting time. */
child->nice = myself->nice;
postfork (child);
if (mode == _P_DETACH
? !child.remember (true)
: !(child.remember (false) && child.reattach ()))
{
/* FIXME: Child in strange state now */
CloseHandle (pi.hProcess);
ForceCloseHandle (pi.hThread);
res = -1;
__leave;
}
}
/* Start the child running */
if (c_flags & CREATE_SUSPENDED)
{
/* Inject a non-inheritable wr_proc_pipe handle into child so that we
can accurately track when the child exits without keeping this
process waiting around for it to exit. */
if (!iscygwin ())
DuplicateHandle (GetCurrentProcess (), wr_proc_pipe, pi.hProcess, NULL,
0, false, DUPLICATE_SAME_ACCESS);
ResumeThread (pi.hThread);
if (iscygwin ())
strace.write_childpid (pi.dwProcessId);
}
ForceCloseHandle (pi.hThread);
sigproc_printf ("spawned windows pid %d", pi.dwProcessId);
bool synced;
if ((mode == _P_DETACH || mode == _P_NOWAIT) && !iscygwin ())
synced = false;
else
/* Just mark a non-cygwin process as 'synced'. We will still eventually
wait for it to exit in maybe_set_exit_code_from_windows(). */
synced = iscygwin () ? sync (pi.dwProcessId, pi.hProcess, INFINITE) : true;
switch (mode)
{
case _P_OVERLAY:
myself.hProcess = pi.hProcess;
if (!synced)
{
if (!proc_retry (pi.hProcess))
{
looped++;
goto loop;
}
close_all_files (true);
}
else
{
if (iscygwin ())
close_all_files (true);
if (!my_wr_proc_pipe
&& WaitForSingleObject (pi.hProcess, 0) == WAIT_TIMEOUT)
wait_for_myself ();
}
if (sem)
__posix_spawn_sem_release (sem, 0);
myself.exit (EXITCODE_NOSET);
break;
case _P_WAIT:
case _P_SYSTEM:
system_call.arm ();
if (waitpid (cygpid, &res, 0) != cygpid)
res = -1;
break;
case _P_DETACH:
res = 0; /* Lost all memory of this child. */
break;
case _P_NOWAIT:
case _P_NOWAITO:
case _P_VFORK:
res = cygpid;
break;
default:
break;
}
}
__except (NO_ERROR)
{
if (get_errno () == ENOMEM)
set_errno (E2BIG);
else
set_errno (EFAULT);
res = -1;
}
__endtry
this->cleanup ();
if (envblock)
free (envblock);
if (attach_to_console && pid_restore)
{
FreeConsole ();
AttachConsole (pid_restore);
cygheap_fdenum cfd (false);
int fd;
while ((fd = cfd.next ()) >= 0)
if (cfd->get_major () == DEV_PTYS_MAJOR)
{
fhandler_pty_slave *ptys =
(fhandler_pty_slave *) (fhandler_base *) cfd;
ptys->fixup_after_attach (false, fd);
}
}