-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathcygmon.cc
1240 lines (1065 loc) · 32.1 KB
/
cygmon.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
/*
cygmon.cc
Periodically samples IP of a process and its DLLs; writes gprof data files.
Written by Mark Geisert <[email protected]>, who admits to
copying pretty liberally from strace.cc. h/t to cgf for strace!
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 WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <winternl.h>
#define cygwin_internal cygwin_internal_dontuse
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <getopt.h>
#include <io.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "../cygwin/include/sys/cygwin.h"
#include "../cygwin/include/cygwin/version.h"
#include "../cygwin/cygtls_padsize.h"
#include "../cygwin/gcc_seh.h"
typedef unsigned short ushort;
typedef uint16_t u_int16_t; // to work around ancient gmon.h usage
#include "../cygwin/gmon.h"
#include "path.h"
#undef cygwin_internal
#define SCALE_SHIFT 2 // == 4 bytes of address space per bucket
#define MS_VC_EXCEPTION 0x406D1388 // thread name notification from child
DWORD child_pid;
int debugging = 0;
void *drive_map;
int events = 0;
int forkprofile = 0;
int new_window;
int numprocesses;
FILE *ofile = stdout;
const char *pgm;
char *prefix = (char *) "gmon.out";
int samplerate = 100; // in Hz; up to 1000 might work
int verbose = 0;
void __attribute__ ((__noreturn__))
usage (FILE *where = stderr)
{
fprintf (where, "\
Usage: %s [OPTIONS] <command-line>\n\
or: %s [OPTIONS] -p <pid>\n\
or: %s -i <filename>...\n\
\n\
Profiles a command or process by sampling its IP (instruction pointer).\n\
OPTIONS are:\n\
\n\
-d, --debug Display debugging messages (toggle: default false)\n\
-e, --events Display Windows DEBUG_EVENTS (toggle: default false)\n\
-f, --fork-profile Profile child processes (toggle: default false)\n\
-h, --help Display usage information and exit\n\
-i, --info=FILENAME(S) Display summary info about given profile data file(s)\n\
-o, --output=FILENAME Write output to file FILENAME rather than stdout\n\
-p, --pid=N Attach to running program with Cygwin pid N\n\
... or with Windows pid -N\n\
-s, --sample-rate=N Set IP sampling rate to N Hz (default 100)\n\
-v, --verbose Display more status messages (toggle: default false)\n\
-V, --version Display version information and exit\n\
-w, --new-window Launch given command in a new window\n\
\n", pgm, pgm, pgm);
exit (where == stderr ? 1 : 0 );
}
/* A span is a memory address range covering an EXE's or DLL's .text segment. */
struct span_list
{
WCHAR *name;
LPVOID base;
size_t textlo;
size_t texthi;
int hitcount;
int hitbuckets;
int numbuckets;
int *buckets;
struct span_list *next;
};
/* A thread. */
struct thread_list
{
DWORD tid;
HANDLE hthread;
WCHAR *name;
struct thread_list *next;
};
/* A child is any process being sampled in this cygmon run. */
struct child_list
{
DWORD pid;
HANDLE hproc;
HANDLE hquitevt;
HANDLE hprofthr;
volatile int profiling;
struct thread_list *threads;
struct span_list *spans;
struct child_list *next;
};
child_list children;
typedef struct child_list child;
void
note (const char *fmt, ...)
{
va_list args;
char buf[4096];
va_start (args, fmt);
vsprintf (buf, fmt, args);
va_end (args);
fputs (buf, ofile);
fflush (ofile);
}
void
warn (int geterrno, const char *fmt, ...)
{
va_list args;
char buf[4096];
va_start (args, fmt);
sprintf (buf, "%s: ", pgm);
vsprintf (strchr (buf, '\0'), fmt, args);
va_end (args);
if (geterrno)
perror (buf);
else
{
fputs (buf, ofile);
fputs ("\n", ofile);
fflush (ofile);
}
}
void __attribute__ ((noreturn))
error (int geterrno, const char *fmt, ...)
{
va_list args;
va_start (args, fmt);
warn (geterrno, fmt, args);
va_end (args);
exit (1);
}
size_t
sample (HANDLE h)
{
static CONTEXT *context = NULL;
size_t status;
if (!context)
{
context = (CONTEXT *) calloc (1, sizeof (CONTEXT));
context->ContextFlags = CONTEXT_CONTROL;
}
if (-1U == SuspendThread (h))
return 0ULL;
status = GetThreadContext (h, context);
if (-1U == ResumeThread (h))
if (verbose)
note ("*** unable to resume thread %d; continuing anyway\n", h);
if (0 == status)
{
if (verbose)
note ("*** unable to get context for thread %d\n", h);
return 0ULL;
}
else
//TODO this approach might not support 32-bit executables on 64-bit
#ifdef __x86_64__
return context->Rip;
#else
return context->Eip;
#endif
}
void
bump_bucket (child *c, size_t pc)
{
span_list *s = c->spans;
//note ("%lu %p\n", c->pid, pc);
if (pc == 0ULL)
return;
while (s)
{
if (pc >= s->textlo && pc < s->texthi)
{
if (0 == s->buckets[(pc - s->textlo) >> SCALE_SHIFT]++)
++s->hitbuckets;
++s->hitcount;
return;
}
s = s->next;
}
if (verbose)
note ("*** pc %p out of range for pid %lu\n", pc, c->pid);
}
/* profiler runs on its own thread; each sampled process has separate profiler*/
DWORD WINAPI
profiler (void *vp)
{
child *c = (child *) vp;
while (c->profiling)
{
thread_list *t = c->threads;
while (t)
{
if (t->hthread)
bump_bucket (c, sample (t->hthread));
t = t->next;
}
if (WaitForSingleObject (c->hquitevt, 1000 / samplerate) == WAIT_OBJECT_0)
break;
}
return 0;
}
void
start_profiler (child *c)
{
DWORD tid;
if (verbose)
note ("*** start profiler thread on pid %lu\n", c->pid);
c->hquitevt = CreateEvent (NULL, TRUE, FALSE, NULL);
if (!c->hquitevt)
error (0, "unable to create quit event\n");
c->profiling = 1;
c->hprofthr = CreateThread (NULL, 0, profiler, (void *) c, 0, &tid);
if (!c->hprofthr)
error (0, "unable to create profiling thread\n");
//SetThreadPriority (c->hprofthr, THREAD_PRIORITY_TIME_CRITICAL); Don't do this!
}
void
stop_profiler (child *c)
{
if (verbose)
note ("*** stop profiler thread on pid %lu\n", c->pid);
c->profiling = 0;
SignalObjectAndWait (c->hquitevt, c->hprofthr, INFINITE, FALSE);
CloseHandle (c->hquitevt);
CloseHandle (c->hprofthr);
c->hquitevt = c->hprofthr = 0;
}
/* Create a gmon.out file for each EXE or DLL that has at least one sample. */
void
dump_profile_data (child *c)
{
int fd;
char filename[MAX_PATH + 1];
struct gmonhdr hdr;
span_list *s = c->spans;
while (s)
{
if (s->hitbuckets == 0)
{
s = s->next;
continue;
}
if (s->name)
{
WCHAR *name = 1 + wcsrchr (s->name, L'\\');
sprintf (filename, "%s.%lu.%ls", prefix, c->pid, name);
}
else
sprintf (filename, "%s.%lu", prefix, c->pid);
fd = open (filename, O_CREAT | O_TRUNC | O_WRONLY | O_BINARY);
if (fd < 0)
error (0, "dump_profile_data: unable to create %s\n", filename);
memset (&hdr, 0, sizeof (hdr));
hdr.lpc = s->textlo;
hdr.hpc = s->texthi;
hdr.ncnt = s->numbuckets * sizeof (short) + sizeof (hdr);
hdr.version = GMONVERSION;
hdr.profrate = samplerate;
/* Our buckets hold more than gmon standard buckets, so truncate here. */
ushort *gmonbuckets = (ushort *) calloc (s->numbuckets, sizeof (ushort));
for (int i = 0; i < s->numbuckets; i++)
{
if (s->buckets[i])
{
if (s->buckets[i] > 65535)
{
note (" WARNING: bucket %d: value %d truncated to %d\n",
i, s->buckets[i], 65535);
gmonbuckets[i] = 65535;
}
else
gmonbuckets[i] = s->buckets[i];
}
}
write (fd, &hdr, sizeof (hdr));
write (fd, gmonbuckets, hdr.ncnt - sizeof (hdr));
note ("%d %s across %d %s written to %s\n", s->hitcount,
s->hitcount == 1 ? "sample" : "samples", s->hitbuckets,
s->hitbuckets == 1 ? "bucket" : "buckets", filename);
close (fd);
chmod (filename, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);//XXX ineffective
free (gmonbuckets);
s = s->next;
}
}
void
info_profile_file (char *filename)
{
ushort *bucket = NULL;
int fd;
struct gmonhdr hdr;
int hitbuckets;
int hitcount;
int numbuckets;
int numrawarcs;
struct rawarc *rawarc = NULL;
int res;
struct stat stat;
fd = open (filename, O_RDONLY | O_BINARY);
if (fd < 0)
{
note ("file %s couldn't be opened; continuing\n", filename);
return;
}
/* Read and sanity-check what should be a gmon header */
res = fstat (fd, &stat);
if (res < 0)
goto notgmon;
if (S_IFREG != (stat.st_mode & S_IFMT))
goto notgmon;
res = read (fd, &hdr, sizeof (hdr));
if (res != sizeof (hdr))
goto notgmon;
if (hdr.lpc >= hdr.hpc)
goto notgmon;
numrawarcs = 0;
if (stat.st_size != hdr.ncnt)
{
numrawarcs = stat.st_size - hdr.ncnt;
if (numrawarcs !=
(int) sizeof (rawarc) * (numrawarcs / (int) sizeof (rawarc)))
goto notgmon;
numrawarcs /= (int) sizeof (rawarc);
}
/* Looks good, so read and display the profiling info */
numbuckets = (hdr.ncnt - sizeof (hdr)) / sizeof (short);
bucket = (ushort *) calloc (numbuckets, sizeof (ushort));
res = read (fd, bucket, hdr.ncnt - sizeof (hdr));
if (res != hdr.ncnt - (int) sizeof (hdr))
goto notgmon;
hitcount = hitbuckets = 0;
for (res = 0; res < numbuckets; ++bucket, ++res)
if (*bucket)
{
++hitbuckets;
hitcount += *bucket;
}
bucket -= numbuckets;
note ("file %s, gmon version 0x%x, sample rate %d\n",
filename, hdr.version, hdr.profrate);
note (" address range 0x%p..0x%p\n", hdr.lpc, hdr.hpc);
note (" numbuckets %d, hitbuckets %d, hitcount %d, numrawarcs %d\n",
numbuckets, hitbuckets, hitcount, numrawarcs);
/* If verbose is set, display contents of buckets and rawarcs arrays */
if (verbose)
{
if (hitbuckets)
note (" bucket data follows...\n");
char *addr = (char *) hdr.lpc;
int incr = (hdr.hpc - hdr.lpc) / numbuckets;
for (res = 0; res < numbuckets; ++bucket, ++res, addr += incr)
if (*bucket)
note (" address 0x%p, hitcount %d\n", addr, *bucket);
bucket -= numbuckets;
if (numrawarcs)
{
rawarc = (struct rawarc *) calloc (numrawarcs, sizeof (rawarc));
res = read (fd, rawarc, numrawarcs * (int) sizeof (rawarc));
if (res != numrawarcs * (int) sizeof (rawarc))
error (0, "unable to read rawarc data");
note (" rawarc data follows...\n");
for (res = 0; res < numrawarcs; ++rawarc, ++res)
note (" from 0x%p, self 0x%p, count %d\n",
rawarc->raw_frompc, rawarc->raw_selfpc, rawarc->raw_count);
}
}
note ("\n");
if (0)
{
notgmon:
note ("file %s isn't a profile data file; continuing\n", filename);
}
if (rawarc)
free (rawarc);
if (bucket)
free (bucket);
close (fd);
}
HANDLE lasth;
DWORD lastpid = 0;
child *
get_child (DWORD pid)
{
child *c;
for (c = &children; (c = c->next) != NULL;)
if (c->pid == pid)
return (child *) c;
return NULL;
}
void add_span (DWORD, WCHAR *, LPVOID, HANDLE);
void
add_child (DWORD pid, WCHAR *name, LPVOID base, HANDLE hproc)
{
if (!get_child (pid))
{
child *c = children.next;
children.next = (child *) calloc (1, sizeof (child));
children.next->next = c;
lastpid = children.next->pid = pid;
lasth = children.next->hproc = hproc;
add_span (pid, name, base, hproc);
start_profiler (children.next);
numprocesses++;
if (verbose)
note ("*** Windows process %lu attached\n", pid);
}
}
void
remove_child (DWORD pid)
{
child *c;
if (pid == lastpid)
lastpid = 0;
for (c = &children; c->next != NULL; c = c->next)
if (c->next->pid == pid)
{
child *c1 = c->next;
c->next = c1->next;
stop_profiler (c1);
dump_profile_data (c1);
CloseHandle (c1->hproc);
c1->hproc = 0;
free (c1);
if (verbose)
note ("*** Windows process %lu detached\n", pid);
numprocesses--;
return;
}
error (0, "no process id %d found", pid);
}
void
add_thread (DWORD pid, DWORD tid, HANDLE h, WCHAR *name)
{
child *c = get_child (pid);
if (!c)
error (0, "add_thread: pid %lu not found\n", pid);
thread_list *t = (thread_list *) calloc (1, sizeof (thread_list));
t->tid = tid;
t->hthread = h;
t->name = name;
t->next = c->threads;
c->threads = t;
}
void
remove_thread (DWORD pid, DWORD tid)
{
child *c = get_child (pid);
if (!c)
error (0, "remove_thread: pid %lu not found\n", pid);
thread_list *t = c->threads;
while (t)
{
if (t->tid == tid)
{
/*TODO We don't free(t), we just zero it out. Maybe revisit this. */
t->tid = 0;
CloseHandle (t->hthread);
t->hthread = 0;
if (t->name)
free (t->name);
t->name = NULL;
return;
}
t = t->next;
}
error (0, "remove_thread: pid %lu tid %lu not found\n", pid, tid);
}
void
read_child (void *buf, SIZE_T size, void *addr, HANDLE h)
{
SIZE_T len;
if (debugging)
note ("read %d bytes at %p from handle %d\n", size, addr, h);
if (0 == ReadProcessMemory (h, addr, buf, size, &len))
error (0, "read_child: failed\n");
if (len != size)
error (0, "read_child: asked for %d bytes but got %d\n", size, len);
}
IMAGE_SECTION_HEADER *
find_text_section (LPVOID base, HANDLE h)
{
static IMAGE_SECTION_HEADER asect;
DWORD lfanew;
WORD machine;
WORD nsects;
DWORD ntsig;
char *ptr = (char *) base;
IMAGE_DOS_HEADER *idh = (IMAGE_DOS_HEADER *) ptr;
read_child ((void *) &lfanew, sizeof (lfanew), &idh->e_lfanew, h);
ptr += lfanew;
/* Code handles 32- or 64-bit headers depending on compilation environment. */
/*TODO It doesn't yet handle 32-bit headers on 64-bit Cygwin or v/v. */
IMAGE_NT_HEADERS *inth = (IMAGE_NT_HEADERS *) ptr;
read_child ((void *) &ntsig, sizeof (ntsig), &inth->Signature, h);
if (ntsig != IMAGE_NT_SIGNATURE)
error (0, "find_text_section: NT signature not found\n");
read_child ((void *) &machine, sizeof (machine),
&inth->FileHeader.Machine, h);
#ifdef __x86_64__
if (machine != IMAGE_FILE_MACHINE_AMD64)
#else
if (machine != IMAGE_FILE_MACHINE_I386)
#endif
error (0, "target program was built for different machine architecture\n");
read_child ((void *) &nsects, sizeof (nsects),
&inth->FileHeader.NumberOfSections, h);
ptr += sizeof (*inth);
IMAGE_SECTION_HEADER *ish = (IMAGE_SECTION_HEADER *) ptr;
for (int i = 0; i < nsects; i++)
{
read_child ((void *) &asect, sizeof (asect), ish, h);
if (0 == memcmp (".text\0\0\0", &asect.Name, 8))
return &asect;
ish++;
}
error (0, ".text section not found\n");
}
void
add_span (DWORD pid, WCHAR *name, LPVOID base, HANDLE h)
{
child *c = get_child (pid);
if (!c)
error (0, "add_span: pid %lu not found\n", pid);
IMAGE_SECTION_HEADER *sect = find_text_section (base, c->hproc);
span_list *s = (span_list *) calloc (1, sizeof (span_list));
s->name = name;
s->base = base;
s->textlo = sect->VirtualAddress + (size_t) base;
s->texthi = s->textlo + sect->Misc.VirtualSize;
s->numbuckets = (s->texthi - s->textlo) >> SCALE_SHIFT;
s->buckets = (int *) calloc (s->numbuckets, sizeof (int));
if (debugging)
note (" span %p - %p, size %X, numbuckets %d\n",
s->textlo, s->texthi, s->texthi - s->textlo, s->numbuckets);
s->next = c->spans;
c->spans = s;
}
#define LINE_BUF_CHUNK 128
class linebuf
{
size_t alloc;
public:
size_t ix;
char *buf;
linebuf ()
{
ix = 0;
alloc = 0;
buf = NULL;
}
~linebuf ()
{
if (buf)
free (buf);
}
void add (const char *what, int len);
void add (const char *what)
{
add (what, strlen (what));
}
void prepend (const char *what, int len);
};
void
linebuf::add (const char *what, int len)
{
size_t newix;
if ((newix = ix + len) >= alloc)
{
alloc += LINE_BUF_CHUNK + len;
buf = (char *) realloc (buf, alloc + 1);
}
memcpy (buf + ix, what, len);
ix = newix;
buf[ix] = '\0';
}
void
linebuf::prepend (const char *what, int len)
{
int buflen;
size_t newix;
if ((newix = ix + len) >= alloc)
{
alloc += LINE_BUF_CHUNK + len;
buf = (char *) realloc (buf, alloc + 1);
buf[ix] = '\0';
}
if ((buflen = strlen (buf)))
memmove (buf + len, buf, buflen + 1);
else
buf[newix] = '\0';
memcpy (buf, what, len);
ix = newix;
}
void
make_command_line (linebuf & one_line, char **argv)
{
for (; *argv; argv++)
{
char *p = NULL;
const char *a = *argv;
int len = strlen (a);
if (len != 0 && !(p = strpbrk (a, " \t\n\r\"")))
one_line.add (a, len);
else
{
one_line.add ("\"", 1);
for (; p; a = p, p = strchr (p, '"'))
{
one_line.add (a, ++p - a);
if (p[-1] == '"')
one_line.add ("\"", 1);
}
if (*a)
one_line.add (a);
one_line.add ("\"", 1);
}
one_line.add (" ", 1);
}
if (one_line.ix)
one_line.buf[one_line.ix - 1] = '\0';
else
one_line.add ("", 1);
}
BOOL WINAPI
ctrl_c (DWORD)
{
static int tic = 1;
if ((tic ^= 1) && !GenerateConsoleCtrlEvent (CTRL_C_EVENT, 0))
error (0, "couldn't send CTRL-C to child, win32 error %d\n",
GetLastError ());
return TRUE;
}
extern "C" {
uintptr_t (*cygwin_internal) (int, ...);
WCHAR cygwin_dll_path[32768];
};
int
load_cygwin ()
{
static HMODULE h;
if (cygwin_internal)
return 1;
if (h)
return 0;
if (!(h = LoadLibrary ("cygwin1.dll")))
{
errno = ENOENT;
return 0;
}
GetModuleFileNameW (h, cygwin_dll_path, 32768);
if (!(cygwin_internal =
(uintptr_t (*) (int, ...)) GetProcAddress (h, "cygwin_internal")))
{
errno = ENOSYS;
return 0;
}
return 1;
}
#define DEBUG_PROCESS_DETACH_ON_EXIT 0x00000001
#define DEBUG_PROCESS_ONLY_THIS_PROCESS 0x00000002
void
attach_process (pid_t pid)
{
child_pid = pid < 0 ? (DWORD) -pid :
(DWORD) cygwin_internal (CW_CYGWIN_PID_TO_WINPID, pid);
if (!DebugActiveProcess (child_pid))
error (0, "couldn't attach to pid %d for debugging", child_pid);
if (forkprofile)
{
HANDLE h = OpenProcess (PROCESS_ALL_ACCESS, FALSE, child_pid);
if (h)
{
/* Try to turn off DEBUG_ONLY_THIS_PROCESS so we can follow forks */
ULONG DebugFlags = DEBUG_PROCESS_DETACH_ON_EXIT;
NTSTATUS status = NtSetInformationProcess (h, ProcessDebugFlags,
&DebugFlags, sizeof (DebugFlags));
if (!NT_SUCCESS (status))
warn (0, "Could not clear DEBUG_ONLY_THIS_PROCESS (%x), "
"will not trace child processes", status);
CloseHandle (h);
}
}
return;
}
void
create_child (char **argv)
{
DWORD flags;
linebuf one_line;
PROCESS_INFORMATION pi;
BOOL ret;
STARTUPINFO si;
if (strchr (*argv, '/'))
*argv = cygpath (*argv, NULL);
memset (&si, 0, sizeof (si));
si.cb = sizeof (si);
flags = CREATE_DEFAULT_ERROR_MODE
| (forkprofile ? DEBUG_PROCESS : DEBUG_ONLY_THIS_PROCESS);
if (new_window)
flags |= CREATE_NEW_CONSOLE | CREATE_NEW_PROCESS_GROUP;
make_command_line (one_line, argv);
SetConsoleCtrlHandler (NULL, 0);
const char *cygwin_env = getenv ("CYGWIN");
const char *space;
if (cygwin_env && strlen (cygwin_env) <= 256) /* sanity check */
space = " ";
else
space = cygwin_env = "";
char *newenv = (char *) malloc (sizeof ("CYGWIN=noglob") +
strlen (space) + strlen (cygwin_env));
sprintf (newenv, "CYGWIN=noglob%s%s", space, cygwin_env);
_putenv (newenv);
ret = CreateProcess (0, one_line.buf, /* command line */
NULL, /* Security */
NULL, /* thread */
TRUE, /* inherit handles */
flags, /* start flags */
NULL, /* default environment */
NULL, /* current directory */
&si, &pi);
if (!ret)
error (0, "error creating process %s, (error %d)", *argv,
GetLastError ());
CloseHandle (pi.hThread);
CloseHandle (pi.hProcess);
child_pid = pi.dwProcessId;
SetConsoleCtrlHandler (ctrl_c, 1);
}
void
handle_output_debug_string (DWORD pid, OUTPUT_DEBUG_STRING_INFO *ev)
{
char *buf = (char *) alloca (ev->nDebugStringLength);
child *c = get_child (pid);
if (!c)
error (0, "handle_output_debug_string: pid %lu not found\n", pid);
read_child (buf, ev->nDebugStringLength, ev->lpDebugStringData, c->hproc);
if (strncmp (buf, "cYg", 3))
{ // string is not from Cygwin, it's from the target app; just display it
if (ev->fUnicode)
note ("%ls", buf);
else
note ("%s", buf);
}
//else TODO Possibly decode and display Cygwin-internal debug string
}
BOOL
GetFileNameFromHandle (HANDLE hFile, WCHAR pszFilename[MAX_PATH+1])
{
BOOL result = FALSE;
ULONG len = 0;
OBJECT_NAME_INFORMATION *ntfn = (OBJECT_NAME_INFORMATION *) alloca (65536);
NTSTATUS status = NtQueryObject (hFile, ObjectNameInformation,
ntfn, 65536, &len);
if (NT_SUCCESS (status))
{
PWCHAR win32path = ntfn->Name.Buffer;
win32path[ntfn->Name.Length / sizeof (WCHAR)] = L'\0';
/* NtQueryObject returns a native NT path. (Try to) convert to Win32. */
if (drive_map)
win32path = (PWCHAR) cygwin_internal (CW_MAP_DRIVE_MAP, drive_map,
win32path);
pszFilename[0] = L'\0';
wcsncat (pszFilename, win32path, MAX_PATH);
result = TRUE;
}
return result;
}
char *
cygwin_pid (DWORD winpid)
{
static char buf[48];
DWORD cygpid;
static DWORD max_cygpid = 0;
if (!max_cygpid)
max_cygpid = (DWORD) cygwin_internal (CW_MAX_CYGWIN_PID);
cygpid = (DWORD) cygwin_internal (CW_WINPID_TO_CYGWIN_PID, winpid);
if (cygpid >= max_cygpid)
snprintf (buf, sizeof buf, "%lu", winpid);
else
snprintf (buf, sizeof buf, "%lu (pid: %lu)", winpid, cygpid);
return buf;
}
DWORD
profile1 (FILE *ofile, pid_t pid)
{
DEBUG_EVENT ev;
DWORD res = 0;
SetThreadPriority (GetCurrentThread (), THREAD_PRIORITY_HIGHEST);
while (1)
{
BOOL debug_event = WaitForDebugEvent (&ev, INFINITE);
DWORD status = DBG_CONTINUE;
if (!debug_event)
continue;
/* Usually continue event here so child resumes while we process event. */
if (ev.dwDebugEventCode != EXCEPTION_DEBUG_EVENT &&
ev.dwDebugEventCode != OUTPUT_DEBUG_STRING_EVENT)
debug_event = ContinueDebugEvent (ev.dwProcessId, ev.dwThreadId, status);
switch (ev.dwDebugEventCode)
{
case CREATE_PROCESS_DEBUG_EVENT:
WCHAR exename[MAX_PATH+1];
if (!GetFileNameFromHandle (ev.u.CreateProcessInfo.hFile, exename))
wcscpy (exename, L"(unknown)");
if (events)
{
note ("--- Process %s created from %ls\n",
cygwin_pid (ev.dwProcessId), exename);
note ("--- Process %s thread %lu created at %p\n",
cygwin_pid (ev.dwProcessId), ev.dwThreadId,
ev.u.CreateProcessInfo.lpStartAddress);
}
if (ev.u.CreateProcessInfo.hFile)
CloseHandle (ev.u.CreateProcessInfo.hFile);
add_child (ev.dwProcessId, wcsdup (exename),
ev.u.CreateProcessInfo.lpBaseOfImage,
ev.u.CreateProcessInfo.hProcess);
add_thread (ev.dwProcessId, ev.dwThreadId,
ev.u.CreateProcessInfo.hThread, wcsdup (exename));
break;
case CREATE_THREAD_DEBUG_EVENT:
if (events)
note ("--- Process %s thread %lu created at %p\n",
cygwin_pid (ev.dwProcessId), ev.dwThreadId,
ev.u.CreateThread.lpStartAddress);
add_thread (ev.dwProcessId, ev.dwThreadId,
ev.u.CreateThread.hThread, NULL);
break;
case LOAD_DLL_DEBUG_EVENT:
WCHAR dllname[MAX_PATH+1];
// lpImageName is not always populated, so find the filename for
// hFile instead
if (!GetFileNameFromHandle (ev.u.LoadDll.hFile, dllname))
wcscpy (dllname, L"(unknown)");
if (events)
note ("--- Process %s loaded %ls at %p\n",
cygwin_pid (ev.dwProcessId), dllname,
ev.u.LoadDll.lpBaseOfDll);
add_span (ev.dwProcessId, wcsdup (dllname),
ev.u.LoadDll.lpBaseOfDll, ev.u.LoadDll.hFile);
if (ev.u.LoadDll.hFile)
CloseHandle (ev.u.LoadDll.hFile);
break;
case UNLOAD_DLL_DEBUG_EVENT:
if (events)
note ("--- Process %s unloaded DLL at %p\n",
cygwin_pid (ev.dwProcessId), ev.u.UnloadDll.lpBaseOfDll);
break;