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
|
/* pinfo.cc: process table support
Copyright 1996, 1997, 1998, 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 <stdlib.h>
#include <time.h>
#include <limits.h>
#include "security.h"
#include "fhandler.h"
#include "path.h"
#include "dtable.h"
#include "cygerrno.h"
#include "sigproc.h"
#include "pinfo.h"
#include "cygwin_version.h"
#include "perprocess.h"
#include "environ.h"
#include <assert.h>
#include <ntdef.h>
#include "ntdll.h"
#include "cygthread.h"
#include "shared_info.h"
static char NO_COPY pinfo_dummy[sizeof (_pinfo)] = {0};
pinfo NO_COPY myself ((_pinfo *)&pinfo_dummy); // Avoid myself != NULL checks
HANDLE hexec_proc;
void __stdcall
pinfo_fixup_after_fork ()
{
if (hexec_proc)
CloseHandle (hexec_proc);
if (!DuplicateHandle (hMainProc, hMainProc, hMainProc, &hexec_proc, 0,
TRUE, DUPLICATE_SAME_ACCESS))
{
system_printf ("couldn't save current process handle %p, %E", hMainProc);
hexec_proc = NULL;
}
}
/* Initialize the process table.
This is done once when the dll is first loaded. */
void __stdcall
set_myself (pid_t pid, HANDLE h)
{
DWORD winpid = GetCurrentProcessId ();
if (pid == 1)
pid = cygwin_pid (winpid);
myself.init (pid, PID_IN_USE | PID_MYSELF, h);
myself->dwProcessId = winpid;
myself->process_state |= PID_IN_USE;
myself->start_time = time (NULL); /* Register our starting time. */
(void) GetModuleFileName (NULL, myself->progname, sizeof (myself->progname));
if (!strace.active)
strace.hello ();
InitializeCriticalSection (&myself->lock);
return;
}
/* Initialize the process table entry for the current task.
This is not called for forked tasks, only execed ones. */
void __stdcall
pinfo_init (char **envp, int envc)
{
if (envp)
{
environ_init (envp, envc);
/* spawn has already set up a pid structure for us so we'll use that */
myself->process_state |= PID_CYGPARENT;
}
else
{
/* Invent our own pid. */
set_myself (1);
myself->ppid = 1;
myself->pgid = myself->sid = myself->pid;
myself->ctty = -1;
myself->uid = ILLEGAL_UID;
environ_init (NULL, 0); /* call after myself has been set up */
}
debug_printf ("pid %d, pgid %d", myself->pid, myself->pgid);
}
void
_pinfo::exit (UINT n, bool norecord)
{
if (this)
{
if (!norecord)
process_state = PID_EXITED;
/* FIXME: There is a potential race between an execed process and its
parent here. I hated to add a mutex just for this, though. */
struct rusage r;
fill_rusage (&r, hMainProc);
add_rusage (&rusage_self, &r);
}
cygthread::terminate ();
sigproc_printf ("Calling ExitProcess %d", n);
ExitProcess (n);
}
void
pinfo::init (pid_t n, DWORD flag, HANDLE in_h)
{
if (myself && n == myself->pid)
{
procinfo = myself;
destroy = 0;
h = NULL;
return;
}
void *mapaddr;
if (!(flag & PID_MYSELF))
mapaddr = NULL;
else
{
flag &= ~PID_MYSELF;
HANDLE hdummy;
mapaddr = open_shared (NULL, 0, hdummy, 0, SH_MYSELF);
}
int createit = flag & (PID_IN_USE | PID_EXECED);
for (int i = 0; i < 10; i++)
{
int created;
char mapname[MAX_PATH];
__small_sprintf (mapname, "cygpid.%x", n);
int mapsize;
if (flag & PID_EXECED)
mapsize = PINFO_REDIR_SIZE;
else
mapsize = sizeof (_pinfo);
if (in_h)
{
h = in_h;
created = 0;
}
else if (!createit)
{
h = OpenFileMappingA (FILE_MAP_READ | FILE_MAP_WRITE, FALSE, mapname);
created = 0;
}
else
{
h = CreateFileMapping (INVALID_HANDLE_VALUE, &sec_all_nih,
PAGE_READWRITE, 0, mapsize, mapname);
created = h && GetLastError () != ERROR_ALREADY_EXISTS;
}
if (!h)
{
if (createit)
__seterrno ();
procinfo = NULL;
return;
}
procinfo = (_pinfo *) MapViewOfFileEx (h, FILE_MAP_READ | FILE_MAP_WRITE,
0, 0, 0, mapaddr);
ProtectHandle1 (h, pinfo_shared_handle);
if ((procinfo->process_state & PID_INITIALIZING) && (flag & PID_NOREDIR)
&& cygwin_pid (procinfo->dwProcessId) != procinfo->pid)
{
release ();
set_errno (ENOENT);
return;
}
if (procinfo->process_state & PID_EXECED)
{
assert (!i);
pid_t realpid = procinfo->pid;
debug_printf ("execed process windows pid %d, cygwin pid %d", n, realpid);
if (realpid == n)
api_fatal ("retrieval of execed process info for pid %d failed due to recursion.", n);
n = realpid;
release ();
if (flag & PID_ALLPIDS)
{
set_errno (ENOENT);
break;
}
continue;
}
/* In certain rare, pathological cases, it is possible for the shared
memory region to exist for a while after a process has exited. This
should only be a brief occurrence, so rather than introduce some kind
of locking mechanism, just loop. FIXME: I'm sure I'll regret doing it
this way at some point. */
if (i < 9 && !created && createit && (procinfo->process_state & PID_EXITED))
{
low_priority_sleep (5);
release ();
continue;
}
if (!created)
/* nothing */;
else if (!(flag & PID_EXECED))
procinfo->pid = n;
else
{
procinfo->process_state |= PID_IN_USE | PID_EXECED;
procinfo->pid = myself->pid;
}
break;
}
destroy = 1;
}
bool
_pinfo::alive ()
{
HANDLE h = OpenProcess (PROCESS_QUERY_INFORMATION, false, dwProcessId);
if (h)
CloseHandle (h);
return !!h;
}
extern char **__argv;
void
_pinfo::commune_recv ()
{
DWORD nr;
DWORD code;
HANDLE hp;
HANDLE __fromthem = NULL;
HANDLE __tothem = NULL;
hp = OpenProcess (PROCESS_DUP_HANDLE, false, dwProcessId);
if (!hp)
{
sigproc_printf ("couldn't open handle for pid %d(%u)", pid, dwProcessId);
hello_pid = -1;
return;
}
if (!DuplicateHandle (hp, fromthem, hMainProc, &__fromthem, 0, false, DUPLICATE_SAME_ACCESS))
{
sigproc_printf ("couldn't duplicate fromthem, %E");
CloseHandle (hp);
hello_pid = -1;
return;
}
if (!DuplicateHandle (hp, tothem, hMainProc, &__tothem, 0, false, DUPLICATE_SAME_ACCESS))
{
sigproc_printf ("couldn't duplicate tothem, %E");
CloseHandle (__fromthem);
CloseHandle (hp);
hello_pid = -1;
return;
}
CloseHandle (hp);
hello_pid = 0;
if (!ReadFile (__fromthem, &code, sizeof code, &nr, NULL) || nr != sizeof code)
{
/* __seterrno ();*/ // this is run from the signal thread, so don't set errno
goto out;
}
switch (code)
{
case PICOM_CMDLINE:
{
unsigned n = 1;
CloseHandle (__fromthem); __fromthem = NULL;
for (char **a = __argv; *a; a++)
n += strlen (*a) + 1;
if (!WriteFile (__tothem, &n, sizeof n, &nr, NULL))
{
/*__seterrno ();*/ // this is run from the signal thread, so don't set errno
sigproc_printf ("WriteFile sizeof argv failed, %E");
}
else
for (char **a = __argv; *a; a++)
if (!WriteFile (__tothem, *a, strlen (*a) + 1, &nr, NULL))
{
sigproc_printf ("WriteFile arg %d failed, %E", a - __argv);
break;
}
if (!WriteFile (__tothem, "", 1, &nr, NULL))
{
sigproc_printf ("WriteFile null failed, %E");
break;
}
}
}
out:
if (__fromthem)
CloseHandle (__fromthem);
if (__tothem)
CloseHandle (__tothem);
}
#define PIPEBUFSIZE (16 * sizeof (DWORD))
commune_result
_pinfo::commune_send (DWORD code)
{
HANDLE fromthem = NULL, tome = NULL;
HANDLE fromme = NULL, tothem = NULL;
DWORD nr;
commune_result res;
res.s = NULL;
res.n = 0;
if (!pid || !this || (dwProcessId != (DWORD) pid && !pinfo (myself->dwProcessId)))
{
set_errno (ESRCH);
goto err;
}
if (!CreatePipe (&fromthem, &tome, &sec_all_nih, PIPEBUFSIZE))
{
sigproc_printf ("first CreatePipe failed, %E");
__seterrno ();
goto err;
}
if (!CreatePipe (&fromme, &tothem, &sec_all_nih, PIPEBUFSIZE))
{
sigproc_printf ("first CreatePipe failed, %E");
__seterrno ();
goto err;
}
EnterCriticalSection (&myself->lock);
myself->tothem = tome;
myself->fromthem = fromme;
myself->hello_pid = pid;
if (!WriteFile (tothem, &code, sizeof code, &nr, NULL) || nr != sizeof code)
{
__seterrno ();
goto err;
}
if (sig_send (this, __SIGCOMMUNE))
goto err;
/* FIXME: Need something better than an busy loop here */
bool isalive;
for (int i = 0; (isalive = alive ()) && (i < 10000); i++)
if (myself->hello_pid <= 0)
break;
else
low_priority_sleep (0);
CloseHandle (tome);
tome = NULL;
CloseHandle (fromme);
fromme = NULL;
if (!isalive)
{
set_errno (ESRCH);
goto err;
}
if (myself->hello_pid < 0)
{
set_errno (ENOSYS);
goto err;
}
size_t n;
if (!ReadFile (fromthem, &n, sizeof n, &nr, NULL) || nr != sizeof n)
{
__seterrno ();
goto err;
}
switch (code)
{
case PICOM_CMDLINE:
res.s = (char *) malloc (n);
char *p;
for (p = res.s; ReadFile (fromthem, p, n, &nr, NULL); p += nr)
continue;
if ((unsigned) (p - res.s) != n)
{
__seterrno ();
goto err;
}
res.n = n;
break;
}
CloseHandle (tothem);
CloseHandle (fromthem);
goto out;
err:
if (tome)
CloseHandle (tome);
if (fromthem)
CloseHandle (fromthem);
if (tothem)
CloseHandle (tothem);
if (fromme)
CloseHandle (fromme);
res.n = 0;
out:
myself->hello_pid = 0;
LeaveCriticalSection (&myself->lock);
return res;
}
char *
_pinfo::cmdline (size_t& n)
{
char *s;
if (!this || !pid)
return NULL;
if (pid != myself->pid)
{
commune_result cr = commune_send (PICOM_CMDLINE);
s = cr.s;
n = cr.n;
}
else
{
n = 1;
for (char **a = __argv; *a; a++)
n += strlen (*a) + 1;
char *p;
p = s = (char *) malloc (n);
for (char **a = __argv; *a; a++)
{
strcpy (p, *a);
p = strchr (p, '\0') + 1;
}
*p = '\0';
}
return s;
}
void
pinfo::release ()
{
if (h)
{
#ifdef DEBUGGING
if (((DWORD) procinfo & 0x77000000) == 0x61000000) try_to_debug ();
#endif
UnmapViewOfFile (procinfo);
procinfo = NULL;
ForceCloseHandle1 (h, pinfo_shared_handle);
h = NULL;
}
}
/* DOCTOOL-START
<sect1 id="func-cygwin-winpid-to-pid">
<title>cygwin_winpid_to_pid</title>
<funcsynopsis>
<funcdef>extern "C" pid_t
<function>cygwin_winpid_to_pid</function>
</funcdef>
<paramdef>int <parameter>winpid</parameter></paramdef>
</funcsynopsis>
<para>Given a windows pid, converts to the corresponding Cygwin
pid, if any. Returns -1 if windows pid does not correspond to
a cygwin pid.</para>
<example>
<title>Example use of cygwin_winpid_to_pid</title>
<programlisting>
extern "C" cygwin_winpid_to_pid (int winpid);
pid_t mypid;
mypid = cygwin_winpid_to_pid (windows_pid);
</programlisting>
</example>
</sect1>
DOCTOOL-END */
extern "C" pid_t
cygwin_winpid_to_pid (int winpid)
{
pinfo p (cygwin_pid (winpid));
if (p)
return p->pid;
set_errno (ESRCH);
return (pid_t) -1;
}
#include <tlhelp32.h>
#define slop_pidlist 200
#define size_pidlist(i) (sizeof (pidlist[0]) * ((i) + 1))
#define size_pinfolist(i) (sizeof (pinfolist[0]) * ((i) + 1))
inline void
winpids::add (DWORD& nelem, bool winpid, DWORD pid)
{
pid_t cygpid = cygwin_pid (pid);
if (nelem >= npidlist)
{
npidlist += slop_pidlist;
pidlist = (DWORD *) realloc (pidlist, size_pidlist (npidlist + 1));
pinfolist = (pinfo *) realloc (pinfolist, size_pinfolist (npidlist + 1));
}
pinfolist[nelem].init (cygpid, PID_NOREDIR | (winpid ? PID_ALLPIDS : 0));
if (winpid)
/* nothing to do */;
else if (!pinfolist[nelem])
return;
else
/* Scan list of previously recorded pids to make sure that this pid hasn't
shown up before. This can happen when a process execs. */
for (unsigned i = 0; i < nelem; i++)
if (pinfolist[i]->pid == pinfolist[nelem]->pid)
{
if ((_pinfo *) pinfolist[nelem] != (_pinfo *) myself)
pinfolist[nelem].release ();
return;
}
pidlist[nelem++] = pid;
}
DWORD
winpids::enumNT (bool winpid)
{
static DWORD szprocs;
static SYSTEM_PROCESSES *procs;
DWORD nelem = 0;
if (!szprocs)
procs = (SYSTEM_PROCESSES *) malloc (sizeof (*procs) + (szprocs = 200 * sizeof (*procs)));
NTSTATUS res;
for (;;)
{
res = NtQuerySystemInformation (SystemProcessesAndThreadsInformation,
procs, szprocs, NULL);
if (res == 0)
break;
if (res == STATUS_INFO_LENGTH_MISMATCH)
procs = (SYSTEM_PROCESSES *) realloc (procs, szprocs += 200 * sizeof (*procs));
else
{
system_printf ("error %p reading system process information", res);
return 0;
}
}
SYSTEM_PROCESSES *px = procs;
for (;;)
{
if (px->ProcessId)
add (nelem, winpid, px->ProcessId);
if (!px->NextEntryDelta)
break;
px = (SYSTEM_PROCESSES *) ((char *) px + px->NextEntryDelta);
}
return nelem;
}
DWORD
winpids::enum9x (bool winpid)
{
DWORD nelem = 0;
HANDLE h = CreateToolhelp32Snapshot (TH32CS_SNAPPROCESS, 0);
if (!h)
{
system_printf ("Couldn't create process snapshot, %E");
return 0;
}
PROCESSENTRY32 proc;
proc.dwSize = sizeof (proc);
if (Process32First (h, &proc))
do
{
if (proc.th32ProcessID)
add (nelem, winpid, proc.th32ProcessID);
}
while (Process32Next (h, &proc));
CloseHandle (h);
return nelem;
}
NO_COPY CRITICAL_SECTION winpids::cs;
void
winpids::set (bool winpid)
{
EnterCriticalSection (&cs);
npids = (this->*enum_processes) (winpid);
if (pidlist)
pidlist[npids] = 0;
LeaveCriticalSection (&cs);
}
void
winpids::init ()
{
InitializeCriticalSection (&cs);
}
DWORD
winpids::enum_init (bool winpid)
{
if (wincap.is_winnt ())
enum_processes = &winpids::enumNT;
else
enum_processes = &winpids::enum9x;
return (this->*enum_processes) (winpid);
}
void
winpids::release ()
{
for (unsigned i = 0; i < npids; i++)
if (pinfolist[i] && (_pinfo *) pinfolist[i] != (_pinfo *) myself)
pinfolist[i].release ();
}
winpids::~winpids ()
{
if (npidlist)
{
release ();
free (pidlist);
free (pinfolist);
}
}
|