aboutsummaryrefslogtreecommitdiff
path: root/gcc/ada/expect.c
blob: e6899632bc9045e70d7c70def7f43cc4eaa3595d (plain)
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
/****************************************************************************
 *                                                                          *
 *                         GNAT RUN-TIME COMPONENTS                         *
 *                                                                          *
 *                               E X P E C T                                *
 *                                                                          *
 *                          C Implementation File                           *
 *                                                                          *
 *                     Copyright (C) 2001-2023, AdaCore                     *
 *                                                                          *
 * GNAT is free software;  you can  redistribute it  and/or modify it under *
 * terms of the  GNU General Public License as published  by the Free Soft- *
 * ware  Foundation;  either version 3,  or (at your option) any later ver- *
 * sion.  GNAT is distributed in the hope that it will be useful, but WITH- *
 * OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY *
 * or FITNESS FOR A PARTICULAR PURPOSE.                                     *
 *                                                                          *
 * As a special exception under Section 7 of GPL version 3, you are granted *
 * additional permissions described in the GCC Runtime Library Exception,   *
 * version 3.1, as published by the Free Software Foundation.               *
 *                                                                          *
 * You should have received a copy of the GNU General Public License and    *
 * a copy of the GCC Runtime Library Exception along with this program;     *
 * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    *
 * <http://www.gnu.org/licenses/>.                                          *
 *                                                                          *
 * GNAT was originally developed  by the GNAT team at  New York University. *
 * Extensive contributions were provided by Ada Core Technologies Inc.      *
 *                                                                          *
 ****************************************************************************/

#ifdef IN_RTS
#define POSIX
#include "runtime.h"
#include <unistd.h>

#else
#include "config.h"
#include "system.h"
#endif

#include "adaint.h"
#include <sys/types.h>

#if defined (__vxworks) && defined (__RTP__)
# include <wait.h>
#elif defined (__Lynx__)
  /* ??? See comment in adaint.c.  */
# define GCC_RESOURCE_H
# include <sys/wait.h>
#elif defined (__PikeOS__) || defined (__MINGW32__)
  /* No wait.h available */
#else
#include <sys/wait.h>
#endif

/* This file provides the low level functionalities needed to implement Expect
   capabilities in GNAT.Expect.
   Implementations for unix and windows systems is provided.
   Dummy stubs are also provided for other systems. */

#ifdef _AIX
/* Work around the fact that gcc/cpp does not define "__unix__" under AiX.  */
#define __unix__
#endif

#ifdef __APPLE__
/* Work around the fact that gcc/cpp does not define "__unix__" on Darwin.  */
#define __unix__
#endif

#ifdef _WIN32

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <process.h>
#include <signal.h>
#include <io.h>
#include "mingw32.h"

int
__gnat_waitpid (int pid)
{
  HANDLE h = OpenProcess (PROCESS_ALL_ACCESS, FALSE, pid);
  DWORD exitcode = 1;

  if (h != NULL)
    {
      (void) WaitForSingleObject (h, INFINITE);
      GetExitCodeProcess (h, &exitcode);
      CloseHandle (h);
    }

  __gnat_win32_remove_handle (NULL, pid);
  return (int) exitcode;
}

int
__gnat_expect_fork (void)
{
  return 0;
}

void
__gnat_expect_portable_execvp (int *pid, char *cmd ATTRIBUTE_UNUSED,
                               char *argv[])
{
  *pid = __gnat_portable_no_block_spawn (argv);
}

int
__gnat_pipe (int *fd)
{
  HANDLE read, write;

  CreatePipe (&read, &write, NULL, 0);
  fd[0]=_open_osfhandle ((intptr_t)read, 0);
  fd[1]=_open_osfhandle ((intptr_t)write, 0);
  return 0;  /* always success */
}

int
__gnat_expect_poll (int *fd,
                    int num_fd,
                    int timeout,
                    int *dead_process,
                    int *is_set)
{
#define MAX_DELAY 100

  int i, delay, infinite = 0;
  DWORD avail;
  HANDLE handles[num_fd];

  *dead_process = 0;

  for (i = 0; i < num_fd; i++)
    is_set[i] = 0;

  for (i = 0; i < num_fd; i++)
    handles[i] = (HANDLE) _get_osfhandle (fd [i]);

  /* Start with small delays, and then increase them, to avoid polling too
     much when waiting a long time */
  delay = 5;

  if (timeout < 0)
    infinite = 1;

  while (1)
    {
      for (i = 0; i < num_fd; i++)
        {
          if (!PeekNamedPipe (handles [i], NULL, 0, NULL, &avail, NULL))
            {
              *dead_process = i + 1;
              return -1;
            }
          if (avail > 0)
            {
              is_set[i] = 1;
              return 1;
            }
        }

      if (!infinite && timeout <= 0)
        return 0;

      Sleep (delay);
      timeout -= delay;

      if (delay < MAX_DELAY)
        delay += 10;
    }
}

#elif defined (VMS)
#include <unistd.h>
#include <stdio.h>
#include <unixio.h>
#include <stdlib.h>
#include <string.h>
#include <vms/descrip.h>
#include <stdio.h>
#include <vms/stsdef.h>
#include <vms/iodef.h>
#include <signal.h>

int
__gnat_waitpid (int pid)
{
  int status = 0;

  waitpid (pid, &status, 0);
  status = WEXITSTATUS (status);

  return status;
}

int
__gnat_pipe (int *fd)
{
  return pipe (fd);
}

int
__gnat_expect_fork (void)
{
  return -1;
}

void
__gnat_expect_portable_execvp (int *pid, char *cmd, char *argv[])
{
  *pid = (int) getpid ();
  /* Since cmd is fully qualified, it is incorrect to call execvp */
  execv (cmd, argv);
  _exit (1);
}

int
__gnat_expect_poll (int *fd,
                    int num_fd,
                    int timeout,
                    int *dead_process,
                    int *is_set)
{
  int i, num, ready = 0;
  unsigned int status;
  int mbxchans [num_fd];
  struct dsc$descriptor_s mbxname;
  struct io_status_block {
    short int condition;
    short int count;
    int dev;
  } iosb;
  char buf [256];

  *dead_process = 0;

  for (i = 0; i < num_fd; i++)
    is_set[i] = 0;

  for (i = 0; i < num_fd; i++)
    {

      /* Get name of the mailbox used in the pipe */
      getname (fd [i], buf);

      /* Assign a channel to the mailbox */
      if (strlen (buf) > 0)
	{
	  mbxname.dsc$w_length = strlen (buf);
	  mbxname.dsc$b_dtype = DSC$K_DTYPE_T;
	  mbxname.dsc$b_class = DSC$K_CLASS_S;
	  mbxname.dsc$a_pointer = buf;

	  status = SYS$ASSIGN (&mbxname, &mbxchans[i], 0, 0, 0);

	  if ((status & 1) != 1)
	    {
              ready = -1;
              *dead_process = i + 1;
              return ready;
	    }
	}
    }

  num = timeout / 100;

  while (1)
    {
      for (i = 0; i < num_fd; i++)
	{
	  if (mbxchans[i] > 0)
	    {

	      /* Peek in the mailbox to see if there's data */
	      status = SYS$QIOW
		(0, mbxchans[i], IO$_SENSEMODE|IO$M_READERCHECK,
		 &iosb, 0, 0, 0, 0, 0, 0, 0, 0);

	      if ((status & 1) != 1)
		{
		  ready = -1;
		  goto deassign;
		}

	      if (iosb.count > 0)
		{
		  is_set[i] = 1;
		  ready = 1;
		  goto deassign;
		}
	    }
	}

      if (timeout > 0 && num == 0)
	{
	  ready = 0;
	  goto deassign;
	}

      usleep (100000);
      num--;
    }

 deassign:

  /* Deassign channels assigned above */
  for (i = 0; i < num_fd; i++)
    {
      if (mbxchans[i] > 0)
	status = SYS$DASSGN (mbxchans[i]);
    }

  return ready;
}
#elif defined (__unix__)

#ifdef __hpux__
#include <sys/ptyio.h>
#endif

#include <sys/time.h>

#ifndef NO_FD_SET
#define SELECT_MASK fd_set
#else /* !NO_FD_SET */
#ifndef _AIX
typedef long fd_mask;
#endif /* _AIX */
#ifdef _IBMR2
#define SELECT_MASK void
#else /* !_IBMR2 */
#define SELECT_MASK int
#endif /* !_IBMR2 */
#endif /* !NO_FD_SET */

int
__gnat_waitpid (int pid)
{
  int status = 0;

  if (waitpid (pid, &status, 0) == -1) {
     return -1;
  }

  if WIFEXITED (status) {
     status = WEXITSTATUS (status);
  } else if WIFSIGNALED (status) {
     status = WTERMSIG (status);
  } else if WIFSTOPPED (status) {
     status = WSTOPSIG (status);
  }

  return status;
}

int
__gnat_pipe (int *fd)
{
  return pipe (fd);
}

int
__gnat_expect_fork (void)
{
  int pid = fork();
  if (pid == 0) {
    __gnat_in_child_after_fork = 1;
  }
  return pid;
}

void
__gnat_expect_portable_execvp (int *pid, char *cmd, char *argv[])
{
  *pid = (int) getpid ();
  /* Since cmd is fully qualified, it is incorrect to call execvp */
  execv (cmd, argv);
  _exit (1);
}

int
__gnat_expect_poll (int *fd,
                    int num_fd,
                    int timeout,
                    int *dead_process,
                    int *is_set)
{
  struct timeval tv;
  SELECT_MASK rset;
  SELECT_MASK eset;

  int max_fd = 0;
  int ready;
  int i;
#ifdef __hpux__
  int received;
#endif

  *dead_process = 0;

  tv.tv_sec  = timeout / 1000;
  tv.tv_usec = (timeout % 1000) * 1000;

  do {
    FD_ZERO (&rset);
    FD_ZERO (&eset);

    for (i = 0; i < num_fd; i++)
      {
        FD_SET (fd[i], &rset);
        FD_SET (fd[i], &eset);

        if (fd[i] > max_fd)
	  max_fd = fd[i];
      }

    ready =
      select (max_fd + 1, &rset, NULL, &eset, timeout == -1 ? NULL : &tv);

    if (ready > 0)
      {
#ifdef __hpux__
	received = 0;
#endif

        for (i = 0; i < num_fd; i++)
	  {
	    if (FD_ISSET (fd[i], &rset))
	      {
		is_set[i] = 1;
#ifdef __hpux__
		received = 1;
#endif
	      }
	    else
	      is_set[i] = 0;
	  }

#ifdef __hpux__
        for (i = 0; i < num_fd; i++)
	  {
	    if (FD_ISSET (fd[i], &eset))
	      {
	        struct request_info ei;

	        /* Only query and reset error state if no file descriptor
	           is ready to be read, otherwise we will be signalling a
	           died process too early */

	        if (!received)
		  {
	            ioctl (fd[i], TIOCREQCHECK, &ei);

	            if (ei.request == TIOCCLOSE)
		      {
		        ioctl (fd[i], TIOCREQSET, &ei);
                        *dead_process = i + 1;
		        return -1;
		      }

	            ioctl (fd[i], TIOCREQSET, &ei);
		  }
	        ready--;
	      }
	  }
#endif
      }
  } while (timeout == -1 && ready == 0);

  return ready;
}

#else

int
__gnat_waitpid (int pid ATTRIBUTE_UNUSED, int sig ATTRIBUTE_UNUSED)
{
  return 0;
}

int
__gnat_pipe (int *fd ATTRIBUTE_UNUSED)
{
  return -1;
}

int
__gnat_expect_fork (void)
{
  return -1;
}

void
__gnat_expect_portable_execvp (int *pid ATTRIBUTE_UNUSED,
			       char *cmd ATTRIBUTE_UNUSED,
			       char *argv[] ATTRIBUTE_UNUSED)
{
  *pid = 0;
}

int
__gnat_expect_poll (int *fd ATTRIBUTE_UNUSED,
                    int num_fd ATTRIBUTE_UNUSED,
                    int timeout ATTRIBUTE_UNUSED,
                    int *dead_process ATTRIBUTE_UNUSED,
                    int *is_set ATTRIBUTE_UNUSED)
{
  *dead_process = 0;
  return -1;
}
#endif