Parent: [77cba9] (diff)

Child: [10ea15] (diff)

Download this file

execmd.cpp    957 lines (864 with data), 24.5 kB

  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
/* Copyright (C) 2004 J.F.Dockes
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef TEST_EXECMD
#include "autoconfig.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/select.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include <time.h>
#include <vector>
#include <string>
#include <sstream>
#include <iostream>
using namespace std;
#include "execmd.h"
#include "pathut.h"
#include "debuglog.h"
#include "smallut.h"
#include "netcon.h"
#include "closefrom.h"
extern char **environ;
bool ExecCmd::o_useVfork = false;
/* From FreeBSD's which command */
static bool exec_is_there(const char *candidate)
{
struct stat fin;
/* XXX work around access(2) false positives for superuser */
if (access(candidate, X_OK) == 0 &&
stat(candidate, &fin) == 0 &&
S_ISREG(fin.st_mode) &&
(getuid() != 0 ||
(fin.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) != 0)) {
return true;
}
return false;
}
bool ExecCmd::which(const string& cmd, string& exepath, const char* path)
{
if (cmd.empty())
return false;
if (cmd[0] == '/') {
if (exec_is_there(cmd.c_str())) {
exepath = cmd;
return true;
} else {
return false;
}
}
const char *pp;
if (path) {
pp = path;
} else {
pp = getenv("PATH");
}
if (pp == 0)
return false;
vector<string> pels;
stringToTokens(pp, pels, ":");
for (vector<string>::iterator it = pels.begin(); it != pels.end(); it++) {
if (it->empty())
*it = ".";
string candidate = (it->empty() ? string(".") : *it) + "/" + cmd;
if (exec_is_there(candidate.c_str())) {
exepath = candidate;
return true;
}
}
return false;
}
void ExecCmd::putenv(const string &ea)
{
m_env.push_back(ea);
}
void ExecCmd::putenv(const string &name, const string& value)
{
string ea = name + "=" + value;
putenv(ea);
}
static void msleep(int millis)
{
struct timespec spec;
spec.tv_sec = millis / 1000;
spec.tv_nsec = (millis % 1000) * 1000000;
nanosleep(&spec, 0);
}
/** A resource manager to ensure that execcmd cleans up if an exception is
* raised in the callback, or at different places on errors occurring
* during method executions */
class ExecCmdRsrc {
public:
ExecCmdRsrc(ExecCmd *parent) : m_parent(parent), m_active(true) {}
void inactivate() {m_active = false;}
~ExecCmdRsrc() {
if (!m_active || !m_parent)
return;
LOGDEB1(("~ExecCmdRsrc: working. mypid: %d\n", (int)getpid()));
// Better to close the descs first in case the child is waiting in read
if (m_parent->m_pipein[0] >= 0)
close(m_parent->m_pipein[0]);
if (m_parent->m_pipein[1] >= 0)
close(m_parent->m_pipein[1]);
if (m_parent->m_pipeout[0] >= 0)
close(m_parent->m_pipeout[0]);
if (m_parent->m_pipeout[1] >= 0)
close(m_parent->m_pipeout[1]);
// It's apparently possible for m_pid to be > 0 and getpgid to fail. In
// this case, we have to conclude that the child process does
// not exist. Not too sure what causes this, but the previous code
// definitely tried to call killpg(-1,) from time to time.
pid_t grp;
if (m_parent->m_pid > 0 && (grp = getpgid(m_parent->m_pid)) > 0) {
LOGDEB(("ExecCmd: killpg(%d, SIGTERM)\n", grp));
int ret = killpg(grp, SIGTERM);
if (ret == 0) {
for (int i = 0; i < 3; i++) {
msleep(i == 0 ? 5 : (i == 1 ? 100 : 2000));
int status;
(void)waitpid(m_parent->m_pid, &status, WNOHANG);
if (kill(m_parent->m_pid, 0) != 0)
break;
if (i == 2) {
LOGDEB(("ExecCmd: killpg(%d, SIGKILL)\n", grp));
killpg(grp, SIGKILL);
(void)waitpid(m_parent->m_pid, &status, WNOHANG);
}
}
} else {
LOGERR(("ExecCmd: error killing process group %d: %d\n",
grp, errno));
}
}
m_parent->m_tocmd.release();
m_parent->m_fromcmd.release();
pthread_sigmask(SIG_UNBLOCK, &m_parent->m_blkcld, 0);
m_parent->reset();
}
private:
ExecCmd *m_parent;
bool m_active;
};
ExecCmd::~ExecCmd()
{
ExecCmdRsrc(this);
}
// In child process. Set up pipes and exec command.
// This must not return. _exit() on error.
// *** This can be called after a vfork, so no modification of the
// process memory at all is allowed ***
// The LOGXX calls should not be there, but they occur only after "impossible"
// errors, which we would most definitely want to have a hint about.
//
// Note that any of the LOGXX calls could block on a mutex set in the
// father process, so that only absolutely exceptional conditions,
// should be logged, for debugging and post-mortem purposes
// If one of the calls block, the problem manifests itself by 20mn
// (filter timeout) of looping on "ExecCmd::doexec: selectloop
// returned 1', because the father is waiting on the read descriptor
inline void ExecCmd::dochild(const string &cmd, const char **argv,
const char **envv,
bool has_input, bool has_output)
{
// Start our own process group
if (setpgid(0, getpid())) {
LOGINFO(("ExecCmd::DOCHILD: setpgid(0, %d) failed: errno %d\n",
getpid(), errno));
}
// Restore SIGTERM to default. Really, signal handling should be
// specified when creating the execmd. Help Recoll get rid of its
// filter children though. To be fixed one day... Not sure that
// all of this is needed. But an ignored sigterm and the masks are
// normally inherited.
if (signal(SIGTERM, SIG_DFL) == SIG_ERR) {
//LOGERR(("ExecCmd::DOCHILD: signal() failed, errno %d\n", errno));
}
sigset_t sset;
sigfillset(&sset);
pthread_sigmask(SIG_UNBLOCK, &sset, 0);
sigprocmask(SIG_UNBLOCK, &sset, 0);
if (has_input) {
close(m_pipein[1]);
if (m_pipein[0] != 0) {
dup2(m_pipein[0], 0);
close(m_pipein[0]);
}
}
if (has_output) {
close(m_pipeout[0]);
if (m_pipeout[1] != 1) {
if (dup2(m_pipeout[1], 1) < 0) {
LOGERR(("ExecCmd::DOCHILD: dup2() failed. errno %d\n", errno));
}
if (close(m_pipeout[1]) < 0) {
LOGERR(("ExecCmd::DOCHILD: close() failed. errno %d\n", errno));
}
}
}
// Do we need to redirect stderr ?
if (!m_stderrFile.empty()) {
int fd = open(m_stderrFile.c_str(), O_WRONLY|O_CREAT
#ifdef O_APPEND
|O_APPEND
#endif
, 0600);
if (fd < 0) {
close(2);
} else {
if (fd != 2) {
dup2(fd, 2);
}
lseek(2, 0, 2);
}
}
// Close all descriptors except 0,1,2
libclf_closefrom(3);
execve(cmd.c_str(), (char *const*)argv, (char *const*)envv);
// Hu ho. This should never happened as we checked the existence of the
// executable before calling dochild... Until we did this, this was
// the chief cause of LOG mutex deadlock
LOGERR(("ExecCmd::DOCHILD: execve(%s) failed. errno %d\n", cmd.c_str(),
errno));
_exit(127);
}
int ExecCmd::startExec(const string &cmd, const vector<string>& args,
bool has_input, bool has_output)
{
{ // Debug and logging
string command = cmd + " ";
for (vector<string>::const_iterator it = args.begin();it != args.end();
it++) {
command += "{" + *it + "} ";
}
LOGDEB(("ExecCmd::startExec: (%d|%d) %s\n",
has_input, has_output, command.c_str()));
}
// The resource manager ensures resources are freed if we return early
ExecCmdRsrc e(this);
if (has_input && pipe(m_pipein) < 0) {
LOGERR(("ExecCmd::startExec: pipe(2) failed. errno %d\n", errno));
return -1;
}
if (has_output && pipe(m_pipeout) < 0) {
LOGERR(("ExecCmd::startExec: pipe(2) failed. errno %d\n", errno));
return -1;
}
//////////// vfork setup section
// We do here things that we could/should do after a fork(), but
// not a vfork(). Does no harm to do it here in both cases, except
// that it needs cleanup (as compared to doing it just before
// exec()).
// Allocate arg vector (2 more for arg0 + final 0)
typedef const char *Ccharp;
Ccharp *argv;
argv = (Ccharp *)malloc((args.size()+2) * sizeof(char *));
if (argv == 0) {
LOGERR(("ExecCmd::doexec: malloc() failed. errno %d\n", errno));
return -1;
}
// Fill up argv
argv[0] = cmd.c_str();
int i = 1;
vector<string>::const_iterator it;
for (it = args.begin(); it != args.end(); it++) {
argv[i++] = it->c_str();
}
argv[i] = 0;
Ccharp *envv;
int envsize;
for (envsize = 0; ; envsize++)
if (environ[envsize] == 0)
break;
envv = (Ccharp *)malloc((envsize + m_env.size() + 2) * sizeof(char *));
if (envv == 0) {
LOGERR(("ExecCmd::doexec: malloc() failed. errno %d\n", errno));
free(argv);
return -1;
}
int eidx;
for (eidx = 0; eidx < envsize; eidx++)
envv[eidx] = environ[eidx];
for (vector<string>::const_iterator it = m_env.begin();
it != m_env.end(); it++) {
envv[eidx++] = it->c_str();
}
envv[eidx] = 0;
// As we are going to use execve, not execvp, do the PATH thing.
string exe;
if (!which(cmd, exe)) {
LOGERR(("ExecCmd::startExec: %s not found\n", cmd.c_str()));
free(argv);
free(envv);
return -1;
}
////////////////////////////////
if (o_useVfork) {
m_pid = vfork();
} else {
m_pid = fork();
}
if (m_pid < 0) {
LOGERR(("ExecCmd::startExec: fork(2) failed. errno %d\n", errno));
return -1;
}
if (m_pid == 0) {
// e.inactivate() is not needed. As we do not return, the call
// stack won't be unwound and destructors of local objects
// won't be called.
dochild(exe, argv, envv, has_input, has_output);
// dochild does not return. Just in case...
_exit(1);
}
// Father process
////////////////////
// Vfork cleanup section
free(argv);
free(envv);
///////////////////
// Set the process group for the child. This is also done in the
// child process see wikipedia(Process_group)
if (setpgid(m_pid, m_pid)) {
// This can fail with EACCES if the son has already done execve
// (linux at least)
LOGDEB2(("ExecCmd: father setpgid(son)(%d,%d) errno %d (ok)\n",
m_pid, m_pid, errno));
}
sigemptyset(&m_blkcld);
sigaddset(&m_blkcld, SIGCHLD);
pthread_sigmask(SIG_BLOCK, &m_blkcld, 0);
if (has_input) {
close(m_pipein[0]);
m_pipein[0] = -1;
NetconCli *iclicon = new NetconCli();
iclicon->setconn(m_pipein[1]);
m_tocmd = NetconP(iclicon);
}
if (has_output) {
close(m_pipeout[1]);
m_pipeout[1] = -1;
NetconCli *oclicon = new NetconCli();
oclicon->setconn(m_pipeout[0]);
m_fromcmd = NetconP(oclicon);
}
/* Don't want to undo what we just did ! */
e.inactivate();
return 0;
}
// Netcon callback. Send data to the command's input
class ExecWriter : public NetconWorker {
public:
ExecWriter(const string *input, ExecCmdProvide *provide)
: m_input(input), m_cnt(0), m_provide(provide)
{}
virtual int data(NetconData *con, Netcon::Event reason)
{
if (!m_input) return -1;
LOGDEB1(("ExecWriter: input m_cnt %d input length %d\n", m_cnt,
m_input->length()));
if (m_cnt >= m_input->length()) {
// Fd ready for more but we got none.
if (m_provide) {
m_provide->newData();
if (m_input->empty()) {
return 0;
} else {
m_cnt = 0;
}
LOGDEB2(("ExecWriter: provide m_cnt %d input length %d\n",
m_cnt, m_input->length()));
} else {
return 0;
}
}
int ret = con->send(m_input->c_str() + m_cnt,
m_input->length() - m_cnt);
LOGDEB2(("ExecWriter: wrote %d to command\n", ret));
if (ret <= 0) {
LOGERR(("ExecWriter: data: can't write\n"));
return -1;
}
m_cnt += ret;
return ret;
}
private:
const string *m_input;
unsigned int m_cnt; // Current offset inside m_input
ExecCmdProvide *m_provide;
};
// Netcon callback. Get data from the command output.
class ExecReader : public NetconWorker {
public:
ExecReader(string *output, ExecCmdAdvise *advise)
: m_output(output), m_advise(advise)
{}
virtual int data(NetconData *con, Netcon::Event reason)
{
char buf[8192];
int n = con->receive(buf, 8192);
LOGDEB1(("ExecReader: got %d from command\n", n));
if (n < 0) {
LOGERR(("ExecCmd::doexec: receive failed. errno %d\n", errno));
} else if (n > 0) {
m_output->append(buf, n);
if (m_advise)
m_advise->newData(n);
} // else n == 0, just return
return n;
}
private:
string *m_output;
ExecCmdAdvise *m_advise;
};
int ExecCmd::doexec(const string &cmd, const vector<string>& args,
const string *input, string *output)
{
if (startExec(cmd, args, input != 0, output != 0) < 0) {
return -1;
}
// Cleanup in case we return early
ExecCmdRsrc e(this);
SelectLoop myloop;
int ret = 0;
if (input || output) {
// Setup output
if (output) {
NetconCli *oclicon = dynamic_cast<NetconCli *>(m_fromcmd.getptr());
if (!oclicon) {
LOGERR(("ExecCmd::doexec: no connection from command\n"));
return -1;
}
oclicon->setcallback(RefCntr<NetconWorker>
(new ExecReader(output, m_advise)));
myloop.addselcon(m_fromcmd, Netcon::NETCONPOLL_READ);
// Give up ownership
m_fromcmd.release();
}
// Setup input
if (input) {
NetconCli *iclicon = dynamic_cast<NetconCli *>(m_tocmd.getptr());
if (!iclicon) {
LOGERR(("ExecCmd::doexec: no connection from command\n"));
return -1;
}
iclicon->setcallback(RefCntr<NetconWorker>
(new ExecWriter(input, m_provide)));
myloop.addselcon(m_tocmd, Netcon::NETCONPOLL_WRITE);
// Give up ownership
m_tocmd.release();
}
// Do the actual reading/writing/waiting
myloop.setperiodichandler(0, 0, m_timeoutMs);
while ((ret = myloop.doLoop()) > 0) {
LOGDEB(("ExecCmd::doexec: selectloop returned %d\n", ret));
if (m_advise)
m_advise->newData(0);
if (m_killRequest) {
LOGINFO(("ExecCmd::doexec: cancel request\n"));
break;
}
}
LOGDEB0(("ExecCmd::doexec: selectloop returned %d\n", ret));
// Check for interrupt request: we won't want to waitpid()
if (m_advise)
m_advise->newData(0);
// The netcons don't take ownership of the fds: we have to close them
// (have to do it before wait, this may be the signal the child is
// waiting for exiting).
if (input) {
close(m_pipein[1]);
m_pipein[1] = -1;
}
if (output) {
close(m_pipeout[0]);
m_pipeout[0] = -1;
}
}
// Normal return: deactivate cleaner, wait() will do the cleanup
e.inactivate();
int ret1 = ExecCmd::wait();
if (ret)
return -1;
return ret1;
}
int ExecCmd::send(const string& data)
{
NetconCli *con = dynamic_cast<NetconCli *>(m_tocmd.getptr());
if (con == 0) {
LOGERR(("ExecCmd::send: outpipe is closed\n"));
return -1;
}
unsigned int nwritten = 0;
while (nwritten < data.length()) {
if (m_killRequest)
break;
int n = con->send(data.c_str() + nwritten, data.length() - nwritten);
if (n < 0) {
LOGERR(("ExecCmd::send: send failed\n"));
return -1;
}
nwritten += n;
}
return nwritten;
}
int ExecCmd::receive(string& data, int cnt)
{
NetconCli *con = dynamic_cast<NetconCli *>(m_fromcmd.getptr());
if (con == 0) {
LOGERR(("ExecCmd::receive: inpipe is closed\n"));
return -1;
}
const int BS = 4096;
char buf[BS];
int ntot = 0;
do {
int toread = cnt > 0 ? MIN(cnt - ntot, BS) : BS;
int n = con->receive(buf, toread);
if (n < 0) {
LOGERR(("ExecCmd::receive: error\n"));
return -1;
} else if (n > 0) {
ntot += n;
data.append(buf, n);
} else {
LOGDEB(("ExecCmd::receive: got 0\n"));
break;
}
} while (cnt > 0 && ntot < cnt);
return ntot;
}
int ExecCmd::getline(string& data)
{
NetconCli *con = dynamic_cast<NetconCli *>(m_fromcmd.getptr());
if (con == 0) {
LOGERR(("ExecCmd::receive: inpipe is closed\n"));
return -1;
}
const int BS = 1024;
char buf[BS];
int n = con->getline(buf, BS);
if (n < 0) {
LOGERR(("ExecCmd::getline: error\n"));
} else if (n > 0) {
data.append(buf, n);
} else {
LOGDEB(("ExecCmd::getline: got 0\n"));
}
return n;
}
// Wait for command status and clean up all resources.
int ExecCmd::wait()
{
ExecCmdRsrc e(this);
int status = -1;
if (!m_killRequest && m_pid > 0) {
if (waitpid(m_pid, &status, 0) < 0) {
LOGERR(("ExecCmd::waitpid: returned -1 errno %d\n", errno));
status = -1;
}
LOGDEB(("ExecCmd::wait: got status 0x%x\n", status));
m_pid = -1;
}
// Let the ExecCmdRsrc cleanup
return status;
}
bool ExecCmd::maybereap(int *status)
{
ExecCmdRsrc e(this);
*status = -1;
if (m_pid <= 0) {
// Already waited for ??
return true;
}
pid_t pid = waitpid(m_pid, status, WNOHANG);
if (pid < 0) {
LOGERR(("ExecCmd::maybereap: returned -1 errno %d\n", errno));
m_pid = -1;
return true;
} else if (pid == 0) {
LOGDEB1(("ExecCmd::maybereap: not exited yet\n"));
e.inactivate();
return false;
} else {
LOGDEB(("ExecCmd::maybereap: got status 0x%x\n", status));
m_pid = -1;
return true;
}
}
// Static
bool ExecCmd::backtick(const std::vector<std::string> cmd, std::string& out)
{
vector<string>::const_iterator it = cmd.begin();
it++;
vector<string> args(it, cmd.end());
ExecCmd mexec;
int status = mexec.doexec(*cmd.begin(), args, 0, &out);
return status == 0;
}
/// ReExec class methods ///////////////////////////////////////////////////
ReExec::ReExec(int argc, char *args[])
{
init(argc, args);
}
void ReExec::init(int argc, char *args[])
{
for (int i = 0; i < argc; i++) {
m_argv.push_back(args[i]);
}
m_cfd = open(".", 0);
char *cd = getcwd(0, 0);
if (cd)
m_curdir = cd;
free(cd);
}
void ReExec::insertArgs(const vector<string>& args, int idx)
{
vector<string>::iterator it, cit;
unsigned int cmpoffset = (unsigned int)-1;
if (idx == -1 || string::size_type(idx) >= m_argv.size()) {
it = m_argv.end();
if (m_argv.size() >= args.size()) {
cmpoffset = m_argv.size() - args.size();
}
} else {
it = m_argv.begin() + idx;
if (idx + args.size() <= m_argv.size()) {
cmpoffset = idx;
}
}
// Check that the option is not already there
if (cmpoffset != (unsigned int)-1) {
bool allsame = true;
for (unsigned int i = 0; i < args.size(); i++) {
if (m_argv[cmpoffset + i] != args[i]) {
allsame = false;
break;
}
}
if (allsame)
return;
}
m_argv.insert(it, args.begin(), args.end());
}
void ReExec::removeArg(const string& arg)
{
for (vector<string>::iterator it = m_argv.begin();
it != m_argv.end(); it++) {
if (*it == arg)
it = m_argv.erase(it);
}
}
// Reexecute myself, as close as possible to the initial exec
void ReExec::reexec()
{
#if 0
char *cwd;
cwd = getcwd(0,0);
FILE *fp = stdout; //fopen("/tmp/exectrace", "w");
if (fp) {
fprintf(fp, "reexec: pwd: [%s] args: ", cwd?cwd:"getcwd failed");
for (vector<string>::const_iterator it = m_argv.begin();
it != m_argv.end(); it++) {
fprintf(fp, "[%s] ", it->c_str());
}
fprintf(fp, "\n");
}
#endif
// Execute the atexit funcs
while (!m_atexitfuncs.empty()) {
(m_atexitfuncs.top())();
m_atexitfuncs.pop();
}
// Try to get back to the initial working directory
if (m_cfd < 0 || fchdir(m_cfd) < 0) {
LOGINFO(("ReExec::reexec: fchdir failed, trying chdir\n"));
if (!m_curdir.empty() && chdir(m_curdir.c_str())) {
LOGERR(("ReExec::reexec: chdir failed\n"));
}
}
// Close all descriptors except 0,1,2
libclf_closefrom(3);
// Allocate arg vector (1 more for final 0)
typedef const char *Ccharp;
Ccharp *argv;
argv = (Ccharp *)malloc((m_argv.size()+1) * sizeof(char *));
if (argv == 0) {
LOGERR(("ExecCmd::doexec: malloc() failed. errno %d\n", errno));
return;
}
// Fill up argv
int i = 0;
vector<string>::const_iterator it;
for (it = m_argv.begin(); it != m_argv.end(); it++) {
argv[i++] = it->c_str();
}
argv[i] = 0;
execvp(m_argv[0].c_str(), (char *const*)argv);
}
////////////////////////////////////////////////////////////////////
#else // TEST
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <string>
#include <iostream>
#include <vector>
using namespace std;
#include "debuglog.h"
#include "cancelcheck.h"
#include "execmd.h"
static int op_flags;
#define OPT_MOINS 0x1
#define OPT_b 0x4
#define OPT_w 0x8
#define OPT_c 0x10
#define OPT_r 0x20
const char *data = "Une ligne de donnees\n";
class MEAdv : public ExecCmdAdvise {
public:
ExecCmd *cmd;
void newData(int cnt) {
if (op_flags & OPT_c) {
static int callcnt;
if (callcnt++ == 3) {
throw CancelExcept();
}
}
cerr << "newData(" << cnt << ")" << endl;
// CancelCheck::instance().setCancel();
// CancelCheck::instance().checkCancel();
// cmd->setCancel();
}
};
class MEPv : public ExecCmdProvide {
public:
FILE *m_fp;
string *m_input;
MEPv(string *i)
: m_input(i)
{
m_fp = fopen("/etc/group", "r");
}
~MEPv() {
if (m_fp)
fclose(m_fp);
}
void newData() {
char line[1024];
if (m_fp && fgets(line, 1024, m_fp)) {
m_input->assign((const char *)line);
} else {
m_input->erase();
}
}
};
static char *thisprog;
static char usage [] =
"trexecmd [-c|-r] cmd [arg1 arg2 ...]\n"
" -c : test cancellation (ie: trexecmd -c sleep 1000)\n"
" -r : test reexec\n"
"trexecmd -w cmd : do the which thing\n"
;
static void Usage(void)
{
fprintf(stderr, "%s: usage:\n%s", thisprog, usage);
exit(1);
}
ReExec reexec;
int main(int argc, char *argv[])
{
reexec.init(argc, argv);
if (0) {
vector<string> newargs;
newargs.push_back("newarg");
newargs.push_back("newarg1");
newargs.push_back("newarg2");
newargs.push_back("newarg3");
newargs.push_back("newarg4");
reexec.insertArgs(newargs, 2);
}
thisprog = argv[0];
argc--; argv++;
while (argc > 0 && **argv == '-') {
(*argv)++;
if (!(**argv))
/* Cas du "adb - core" */
Usage();
while (**argv)
switch (*(*argv)++) {
case 'c': op_flags |= OPT_c; break;
case 'r': op_flags |= OPT_r; break;
case 'w': op_flags |= OPT_w; break;
default: Usage(); break;
}
b1: argc--; argv++;
}
if (argc < 1)
Usage();
string cmd = *argv++; argc--;
vector<string> l;
while (argc > 0) {
l.push_back(*argv++); argc--;
}
DebugLog::getdbl()->setloglevel(DEBDEB1);
DebugLog::setfilename("stderr");
signal(SIGPIPE, SIG_IGN);
if (op_flags & OPT_r) {
chdir("/");
argv[0] = strdup("");
sleep(1);
reexec.reexec();
}
if (op_flags & OPT_w) {
string path;
if (ExecCmd::which(cmd, path)) {
cout << path << endl;
exit(0);
}
exit(1);
}
ExecCmd mexec;
MEAdv adv;
adv.cmd = &mexec;
mexec.setAdvise(&adv);
mexec.setTimeout(5);
mexec.setStderr("/tmp/trexecStderr");
mexec.putenv("TESTVARIABLE1=TESTVALUE1");
mexec.putenv("TESTVARIABLE2=TESTVALUE2");
mexec.putenv("TESTVARIABLE3=TESTVALUE3");
string input, output;
// input = data;
string *ip = 0;
ip = &input;
MEPv pv(&input);
mexec.setProvide(&pv);
int status = -1;
try {
status = mexec.doexec(cmd, l, ip, &output);
} catch (CancelExcept) {
cerr << "CANCELLED" << endl;
}
fprintf(stderr, "Status: 0x%x\n", status);
cout << output;
exit (status >> 8);
}
#endif // TEST