aboutsummaryrefslogtreecommitdiff
path: root/libiberty/pex-common.c
blob: 6fd3fdecd808b38ad024a7db14163795eb99a91f (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
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
/* Common code for executing a program in a sub-process.
   Copyright (C) 2005, 2010 Free Software Foundation, Inc.
   Written by Ian Lance Taylor <ian@airs.com>.

This file is part of the libiberty library.
Libiberty is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

Libiberty 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with libiberty; see the file COPYING.LIB.  If not,
write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1301, USA.  */

#include "config.h"
#include "libiberty.h"
#include "pex-common.h"

#include <stdio.h>
#include <errno.h>
#ifdef NEED_DECLARATION_ERRNO
extern int errno;
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

extern int mkstemps (char *, int);

/* This file contains subroutines for the program execution routines
   (pex_init, pex_run, etc.).  This file is compiled on all
   systems.  */

static void pex_add_remove (struct pex_obj *, const char *, int);
static int pex_get_status_and_time (struct pex_obj *, int, const char **,
				    int *);

/* Initialize a pex_obj structure.  */

struct pex_obj *
pex_init_common (int flags, const char *pname, const char *tempbase,
		 const struct pex_funcs *funcs)
{
  struct pex_obj *obj;

  obj = XNEW (struct pex_obj);
  obj->flags = flags;
  obj->pname = pname;
  obj->tempbase = tempbase;
  obj->next_input = STDIN_FILE_NO;
  obj->next_input_name = NULL;
  obj->next_input_name_allocated = 0;
  obj->stderr_pipe = -1;
  obj->count = 0;
  obj->children = NULL;
  obj->status = NULL;
  obj->time = NULL;
  obj->number_waited = 0;
  obj->input_file = NULL;
  obj->read_output = NULL;
  obj->read_err = NULL;
  obj->remove_count = 0;
  obj->remove = NULL;
  obj->funcs = funcs;
  obj->sysdep = NULL;
  return obj;
}

/* Add a file to be removed when we are done.  */

static void
pex_add_remove (struct pex_obj *obj, const char *name, int allocated)
{
  char *add;

  ++obj->remove_count;
  obj->remove = XRESIZEVEC (char *, obj->remove, obj->remove_count);
  if (allocated)
    add = (char *) name;
  else
    add = xstrdup (name);
  obj->remove[obj->remove_count - 1] = add;
}

/* Generate a temporary file name based on OBJ, FLAGS, and NAME.
   Return NULL if we were unable to reserve a temporary filename.

   If non-NULL, the result is either allocated with malloc, or the
   same pointer as NAME.  */
static char *
temp_file (struct pex_obj *obj, int flags, char *name)
{
  if (name == NULL)
    {
      if (obj->tempbase == NULL)
        {
          name = make_temp_file (NULL);
        }
      else
        {
          int len = strlen (obj->tempbase);
          int out;

          if (len >= 6
              && strcmp (obj->tempbase + len - 6, "XXXXXX") == 0)
            name = xstrdup (obj->tempbase);
          else
            name = concat (obj->tempbase, "XXXXXX", NULL);

          out = mkstemps (name, 0);
          if (out < 0)
            {
              free (name);
              return NULL;
            }

          /* This isn't obj->funcs->close because we got the
             descriptor from mkstemps, not from a function in
             obj->funcs.  Calling close here is just like what
             make_temp_file does.  */
          close (out);
        }
    }
  else if ((flags & PEX_SUFFIX) != 0)
    {
      if (obj->tempbase == NULL)
        name = make_temp_file (name);
      else
        name = concat (obj->tempbase, name, NULL);
    }

  return name;
}


/* As for pex_run (), but permits the environment for the child process
   to be specified. */

const char *
pex_run_in_environment (struct pex_obj *obj, int flags, const char *executable,
       	                char * const * argv, char * const * env,
                        const char *orig_outname, const char *errname,
                  	int *err)
{
  const char *errmsg;
  int in, out, errdes;
  char *outname;
  int outname_allocated;
  int p[2];
  int toclose;
  pid_t pid;

  in = -1;
  out = -1;
  errdes = -1;
  outname = (char *) orig_outname;
  outname_allocated = 0;

  /* If the user called pex_input_file, close the file now.  */
  if (obj->input_file)
    {
      if (fclose (obj->input_file) == EOF)
        {
          errmsg = "closing pipeline input file";
          goto error_exit;
        }
      obj->input_file = NULL;
    }

  /* Set IN.  */

  if (obj->next_input_name != NULL)
    {
      /* We have to make sure that the previous process has completed
	 before we try to read the file.  */
      if (!pex_get_status_and_time (obj, 0, &errmsg, err))
	goto error_exit;

      in = obj->funcs->open_read (obj, obj->next_input_name,
				  (flags & PEX_BINARY_INPUT) != 0);
      if (in < 0)
	{
	  *err = errno;
	  errmsg = "open temporary file";
	  goto error_exit;
	}
      if (obj->next_input_name_allocated)
	{
	  free (obj->next_input_name);
	  obj->next_input_name_allocated = 0;
	}
      obj->next_input_name = NULL;
    }
  else
    {
      in = obj->next_input;
      if (in < 0)
	{
	  *err = 0;
	  errmsg = "pipeline already complete";
	  goto error_exit;
	}
    }

  /* Set OUT and OBJ->NEXT_INPUT/OBJ->NEXT_INPUT_NAME.  */

  if ((flags & PEX_LAST) != 0)
    {
      if (outname == NULL)
	out = STDOUT_FILE_NO;
      else if ((flags & PEX_SUFFIX) != 0)
	{
	  outname = concat (obj->tempbase, outname, NULL);
	  outname_allocated = 1;
	}
      obj->next_input = -1;
    }
  else if ((obj->flags & PEX_USE_PIPES) == 0)
    {
      outname = temp_file (obj, flags, outname);
      if (! outname)
        {
          *err = 0;
          errmsg = "could not create temporary file";
          goto error_exit;
        }

      if (outname != orig_outname)
        outname_allocated = 1;

      if ((obj->flags & PEX_SAVE_TEMPS) == 0)
	{
	  pex_add_remove (obj, outname, outname_allocated);
	  outname_allocated = 0;
	}

      /* Hand off ownership of outname to the next stage.  */
      obj->next_input_name = outname;
      obj->next_input_name_allocated = outname_allocated;
      outname_allocated = 0;
    }
  else
    {
      if (obj->funcs->pipe (obj, p, (flags & PEX_BINARY_OUTPUT) != 0) < 0)
	{
	  *err = errno;
	  errmsg = "pipe";
	  goto error_exit;
	}

      out = p[WRITE_PORT];
      obj->next_input = p[READ_PORT];
    }

  if (out < 0)
    {
      out = obj->funcs->open_write (obj, outname,
				    (flags & PEX_BINARY_OUTPUT) != 0);
      if (out < 0)
	{
	  *err = errno;
	  errmsg = "open temporary output file";
	  goto error_exit;
	}
    }

  if (outname_allocated)
    {
      free (outname);
      outname_allocated = 0;
    }

  /* Set ERRDES.  */

  if (errname != NULL && (flags & PEX_STDERR_TO_PIPE) != 0)
    {
      *err = 0;
      errmsg = "both ERRNAME and PEX_STDERR_TO_PIPE specified.";
      goto error_exit;
    }

  if (obj->stderr_pipe != -1)
    {
      *err = 0;
      errmsg = "PEX_STDERR_TO_PIPE used in the middle of pipeline";
      goto error_exit;
    }

  if (errname == NULL)
    {
      if (flags & PEX_STDERR_TO_PIPE)
	{
	  if (obj->funcs->pipe (obj, p, (flags & PEX_BINARY_ERROR) != 0) < 0)
	    {
	      *err = errno;
	      errmsg = "pipe";
	      goto error_exit;
	    }
	  
	  errdes = p[WRITE_PORT];
	  obj->stderr_pipe = p[READ_PORT];	  
	}
      else
	{
	  errdes = STDERR_FILE_NO;
	}
    }
  else
    {
      errdes = obj->funcs->open_write (obj, errname, 
				       (flags & PEX_BINARY_ERROR) != 0);
      if (errdes < 0)
	{
	  *err = errno;
	  errmsg = "open error file";
	  goto error_exit;
	}
    }

  /* If we are using pipes, the child process has to close the next
     input pipe.  */

  if ((obj->flags & PEX_USE_PIPES) == 0)
    toclose = -1;
  else
    toclose = obj->next_input;

  /* Run the program.  */

  pid = obj->funcs->exec_child (obj, flags, executable, argv, env,
				in, out, errdes, toclose, &errmsg, err);
  if (pid < 0)
    goto error_exit;

  ++obj->count;
  obj->children = XRESIZEVEC (pid_t, obj->children, obj->count);
  obj->children[obj->count - 1] = pid;

  return NULL;

 error_exit:
  if (in >= 0 && in != STDIN_FILE_NO)
    obj->funcs->close (obj, in);
  if (out >= 0 && out != STDOUT_FILE_NO)
    obj->funcs->close (obj, out);
  if (errdes >= 0 && errdes != STDERR_FILE_NO)
    obj->funcs->close (obj, errdes);
  if (outname_allocated)
    free (outname);
  return errmsg;
}

/* Run a program.  */

const char *
pex_run (struct pex_obj *obj, int flags, const char *executable,
       	 char * const * argv, const char *orig_outname, const char *errname,
         int *err)
{
  return pex_run_in_environment (obj, flags, executable, argv, NULL,
				 orig_outname, errname, err);
}

/* Return a FILE pointer for a temporary file to fill with input for
   the pipeline.  */
FILE *
pex_input_file (struct pex_obj *obj, int flags, const char *in_name)
{
  char *name = (char *) in_name;
  FILE *f;

  /* This must be called before the first pipeline stage is run, and
     there must not have been any other input selected.  */
  if (obj->count != 0
      || (obj->next_input >= 0 && obj->next_input != STDIN_FILE_NO)
      || obj->next_input_name)
    {
      errno = EINVAL;
      return NULL;
    }

  name = temp_file (obj, flags, name);
  if (! name)
    return NULL;

  f = fopen (name, (flags & PEX_BINARY_OUTPUT) ? "wb" : "w");
  if (! f)
    {
      free (name);
      return NULL;
    }

  obj->input_file = f;
  obj->next_input_name = name;
  obj->next_input_name_allocated = (name != in_name);

  return f;
}

/* Return a stream for a pipe connected to the standard input of the
   first stage of the pipeline.  */
FILE *
pex_input_pipe (struct pex_obj *obj, int binary)
{
  int p[2];
  FILE *f;

  /* You must call pex_input_pipe before the first pex_run or pex_one.  */
  if (obj->count > 0)
    goto usage_error;

  /* You must be using pipes.  Implementations that don't support
     pipes clear this flag before calling pex_init_common.  */
  if (! (obj->flags & PEX_USE_PIPES))
    goto usage_error;

  /* If we have somehow already selected other input, that's a
     mistake.  */
  if ((obj->next_input >= 0 && obj->next_input != STDIN_FILE_NO)
      || obj->next_input_name)
    goto usage_error;

  if (obj->funcs->pipe (obj, p, binary != 0) < 0)
    return NULL;

  f = obj->funcs->fdopenw (obj, p[WRITE_PORT], binary != 0);
  if (! f)
    {
      int saved_errno = errno;
      obj->funcs->close (obj, p[READ_PORT]);
      obj->funcs->close (obj, p[WRITE_PORT]);
      errno = saved_errno;
      return NULL;
    }

  obj->next_input = p[READ_PORT];

  return f;

 usage_error:
  errno = EINVAL;
  return NULL;
}

/* Return a FILE pointer for the output of the last program
   executed.  */

FILE *
pex_read_output (struct pex_obj *obj, int binary)
{
  if (obj->next_input_name != NULL)
    {
      const char *errmsg;
      int err;

      /* We have to make sure that the process has completed before we
	 try to read the file.  */
      if (!pex_get_status_and_time (obj, 0, &errmsg, &err))
	{
	  errno = err;
	  return NULL;
	}

      obj->read_output = fopen (obj->next_input_name, binary ? "rb" : "r");

      if (obj->next_input_name_allocated)
	{
	  free (obj->next_input_name);
	  obj->next_input_name_allocated = 0;
	}
      obj->next_input_name = NULL;
    }
  else
    {
      int o;

      o = obj->next_input;
      if (o < 0 || o == STDIN_FILE_NO)
	return NULL;
      obj->read_output = obj->funcs->fdopenr (obj, o, binary);
      obj->next_input = -1;
    }

  return obj->read_output;
}

FILE *
pex_read_err (struct pex_obj *obj, int binary)
{
  int o;
  
  o = obj->stderr_pipe;
  if (o < 0 || o == STDIN_FILE_NO)
    return NULL;
  obj->read_err = obj->funcs->fdopenr (obj, o, binary);
  obj->stderr_pipe = -1;
  return obj->read_err;    
}

/* Get the exit status and, if requested, the resource time for all
   the child processes.  Return 0 on failure, 1 on success.  */

static int
pex_get_status_and_time (struct pex_obj *obj, int done, const char **errmsg,
			 int *err)
{
  int ret;
  int i;

  if (obj->number_waited == obj->count)
    return 1;

  obj->status = XRESIZEVEC (int, obj->status, obj->count);
  if ((obj->flags & PEX_RECORD_TIMES) != 0)
    obj->time = XRESIZEVEC (struct pex_time, obj->time, obj->count);

  ret = 1;
  for (i = obj->number_waited; i < obj->count; ++i)
    {
      if (obj->funcs->wait (obj, obj->children[i], &obj->status[i],
			    obj->time == NULL ? NULL : &obj->time[i],
			    done, errmsg, err) < 0)
	ret = 0;
    }
  obj->number_waited = i;

  return ret;
}

/* Get exit status of executed programs.  */

int
pex_get_status (struct pex_obj *obj, int count, int *vector)
{
  if (obj->status == NULL)
    {
      const char *errmsg;
      int err;

      if (!pex_get_status_and_time (obj, 0, &errmsg, &err))
	return 0;
    }

  if (count > obj->count)
    {
      memset (vector + obj->count, 0, (count - obj->count) * sizeof (int));
      count = obj->count;
    }

  memcpy (vector, obj->status, count * sizeof (int));

  return 1;
}

/* Get process times of executed programs.  */

int
pex_get_times (struct pex_obj *obj, int count, struct pex_time *vector)
{
  if (obj->status == NULL)
    {
      const char *errmsg;
      int err;

      if (!pex_get_status_and_time (obj, 0, &errmsg, &err))
	return 0;
    }

  if (obj->time == NULL)
    return 0;

  if (count > obj->count)
    {
      memset (vector + obj->count, 0,
	      (count - obj->count) * sizeof (struct pex_time));
      count = obj->count;
    }

  memcpy (vector, obj->time, count * sizeof (struct pex_time));

  return 1;
}

/* Free a pex_obj structure.  */

void
pex_free (struct pex_obj *obj)
{
  /* Close pipe file descriptors corresponding to child's stdout and
     stderr so that the child does not hang trying to output something
     while we're waiting for it.  */
  if (obj->next_input >= 0 && obj->next_input != STDIN_FILE_NO)
    obj->funcs->close (obj, obj->next_input);
  if (obj->stderr_pipe >= 0 && obj->stderr_pipe != STDIN_FILE_NO)
    obj->funcs->close (obj, obj->stderr_pipe);
  if (obj->read_output != NULL)
    fclose (obj->read_output);
  if (obj->read_err != NULL)
    fclose (obj->read_err);

  /* If the caller forgot to wait for the children, we do it here, to
     avoid zombies.  */
  if (obj->status == NULL)
    {
      const char *errmsg;
      int err;

      obj->flags &= ~ PEX_RECORD_TIMES;
      pex_get_status_and_time (obj, 1, &errmsg, &err);
    }

  if (obj->next_input_name_allocated)
    free (obj->next_input_name);
  free (obj->children);
  free (obj->status);
  free (obj->time);

  if (obj->remove_count > 0)
    {
      int i;

      for (i = 0; i < obj->remove_count; ++i)
	{
	  remove (obj->remove[i]);
	  free (obj->remove[i]);
	}
      free (obj->remove);
    }

  if (obj->funcs->cleanup != NULL)
    obj->funcs->cleanup (obj);

  free (obj);
}