aboutsummaryrefslogblamecommitdiffstats
path: root/erts/emulator/beam/erl_bif_port.c
blob: 378c5e73fd8d65818d57956bb8acad7381de36a7 (plain) (tree)
1
2
3
4
5
6
7
8
9
10
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

                   


                                                        




                                                                      
  



                                                                         
  






                     













































































































































































































































































































































































































































































































































































                                                                                              

                                                                           


































































































































                                                                                        
                                             

                          
                                    





                                                                        
                                      































































































































































































































































































































































                                                                                    
                




                     


                                                               





                                                                        
                    


                                  

                                                                       
                  
                                                          


                                    
                              





































































































































































































































                                                                                       
                                                                             



























































                                                                             
                                        

                                                                            

                                                                                         



                                  
                                                                           
                                                                    
                                                      






















































                                                                                     
                                        
















                                                                       
/*
 * %CopyrightBegin%
 *
 * Copyright Ericsson AB 2001-2010. All Rights Reserved.
 *
 * The contents of this file are subject to the Erlang Public License,
 * Version 1.1, (the "License"); you may not use this file except in
 * compliance with the License. You should have received a copy of the
 * Erlang Public License along with this software. If not, it can be
 * retrieved online at http://www.erlang.org/.
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 *
 * %CopyrightEnd%
 */

#ifdef HAVE_CONFIG_H
#  include "config.h"
#endif

#include <ctype.h>

#define ERTS_WANT_EXTERNAL_TAGS
#include "sys.h"
#include "erl_vm.h"
#include "erl_sys_driver.h"
#include "global.h"
#include "erl_process.h"
#include "error.h"
#include "bif.h"
#include "big.h"
#include "dist.h"
#include "erl_version.h"
#include "erl_binary.h"
#include "erl_db_util.h"
#include "register.h"
#include "external.h"
#include "packet_parser.h"
#include "erl_bits.h"

static int open_port(Process* p, Eterm name, Eterm settings, int *err_nump);
static byte* convert_environment(Process* p, Eterm env);
static char **convert_args(Eterm);
static void free_args(char **);

char *erts_default_arg0 = "default";

BIF_RETTYPE open_port_2(BIF_ALIST_2)
{
    int port_num;
    Eterm port_val;
    char *str;
    int err_num;

    if ((port_num = open_port(BIF_P, BIF_ARG_1, BIF_ARG_2, &err_num)) < 0) {
	if (port_num == -3) {
	    ASSERT(err_num == BADARG || err_num == SYSTEM_LIMIT);
	    BIF_ERROR(BIF_P, err_num);
	} else if (port_num == -2) {
	    str = erl_errno_id(err_num);
	} else {
	    str = "einval";
	}
	BIF_P->fvalue = am_atom_put(str, strlen(str));
	BIF_ERROR(BIF_P, EXC_ERROR);
    }

    erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_LINK);

    port_val = erts_port[port_num].id;
    erts_add_link(&(erts_port[port_num].nlinks), LINK_PID, BIF_P->id);
    erts_add_link(&(BIF_P->nlinks), LINK_PID, port_val);

    erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_LINK);

    erts_port_release(&erts_port[port_num]);

    BIF_RET(port_val);
}

/****************************************************************************

  PORT BIFS:

           port_command/2   -- replace Port ! {..., {command, Data}}
               port_command(Port, Data) -> true
               when port(Port), io-list(Data)

           port_control/3   -- new port_control(Port, Ctl, Data) -> Reply
	      port_control(Port, Ctl, Data) -> Reply
              where integer(Ctl), io-list(Data), io-list(Reply)

           port_close/1     -- replace Port ! {..., close}
             port_close(Port) -> true
             when port(Port)

           port_connect/2   -- replace Port ! {..., {connect, Pid}}
              port_connect(Port, Pid) 
              when port(Port), pid(Pid)

 ***************************************************************************/

static Port*
id_or_name2port(Process *c_p, Eterm id)
{
    Port *port;
    if (is_not_atom(id))
	port = erts_id2port(id, c_p, ERTS_PROC_LOCK_MAIN);
    else
	erts_whereis_name(c_p, ERTS_PROC_LOCK_MAIN, id, NULL, 0, 0, &port);
    return port;
}

#define ERTS_PORT_COMMAND_FLAG_FORCE		(((Uint32) 1) << 0)
#define ERTS_PORT_COMMAND_FLAG_NOSUSPEND	(((Uint32) 1) << 1)

static BIF_RETTYPE do_port_command(Process *BIF_P,
				   Eterm BIF_ARG_1,
				   Eterm BIF_ARG_2,
				   Eterm BIF_ARG_3,
				   Uint32 flags)
{
    BIF_RETTYPE res;
    Port *p;

    /* Trace sched out before lock check wait */    
    if (IS_TRACED_FL(BIF_P, F_TRACE_SCHED_PROCS)) {
	trace_virtual_sched(BIF_P, am_out);
    }
    
    if (erts_system_profile_flags.runnable_procs && erts_system_profile_flags.exclusive) {
    	profile_runnable_proc(BIF_P, am_inactive);
    }

    p = id_or_name2port(BIF_P, BIF_ARG_1);
    if (!p) {
    	if (IS_TRACED_FL(BIF_P, F_TRACE_SCHED_PROCS)) {
	    trace_virtual_sched(BIF_P, am_in);
	}
    	if (erts_system_profile_flags.runnable_procs && erts_system_profile_flags.exclusive) {
    	    profile_runnable_proc(BIF_P, am_active);
    	}
	BIF_ERROR(BIF_P, BADARG);
    }
    
    /* Trace port in, id_or_name2port causes wait */

    if (IS_TRACED_FL(p, F_TRACE_SCHED_PORTS)) {
	trace_sched_ports_where(p, am_in, am_command);
    }
    if (erts_system_profile_flags.runnable_ports && !erts_port_is_scheduled(p)) {
    	profile_runnable_port(p, am_active);
    }

    ERTS_BIF_PREP_RET(res, am_true);

    if ((flags & ERTS_PORT_COMMAND_FLAG_FORCE)
	&& !(p->drv_ptr->flags & ERL_DRV_FLAG_SOFT_BUSY)) {
	ERTS_BIF_PREP_ERROR(res, BIF_P, EXC_NOTSUP);
    }
    else if (!(flags & ERTS_PORT_COMMAND_FLAG_FORCE)
	     && p->status & ERTS_PORT_SFLG_PORT_BUSY) {
	if (flags & ERTS_PORT_COMMAND_FLAG_NOSUSPEND) {
	    ERTS_BIF_PREP_RET(res, am_false);
	}
	else {
	    erts_suspend(BIF_P, ERTS_PROC_LOCK_MAIN, p);
	    if (erts_system_monitor_flags.busy_port) {
		monitor_generic(BIF_P, am_busy_port, p->id);
	    }
	    ERTS_BIF_PREP_YIELD3(res, bif_export[BIF_port_command_3], BIF_P,
				 BIF_ARG_1, BIF_ARG_2, BIF_ARG_3);    
	}
    } else {
	int wres;
	erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_MAIN);
	ERTS_SMP_CHK_NO_PROC_LOCKS;
	wres = erts_write_to_port(BIF_P->id, p, BIF_ARG_2);
	erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
	if (wres != 0) {
	    ERTS_BIF_PREP_ERROR(res, BIF_P, BADARG);
	}
    }
    
    if (IS_TRACED_FL(p, F_TRACE_SCHED_PORTS)) {
	trace_sched_ports_where(p, am_out, am_command);
    }
    if (erts_system_profile_flags.runnable_ports && !erts_port_is_scheduled(p)) {
    	profile_runnable_port(p, am_inactive);
    }

    erts_port_release(p);
    /* Trace sched in after port release */
    if (IS_TRACED_FL(BIF_P, F_TRACE_SCHED_PROCS)) {
	trace_virtual_sched(BIF_P, am_in);
    }
    if (erts_system_profile_flags.runnable_procs && erts_system_profile_flags.exclusive) {
    	profile_runnable_proc(BIF_P, am_active);
    }
    
    if (ERTS_PROC_IS_EXITING(BIF_P)) {
	KILL_CATCHES(BIF_P);	/* Must exit */
	ERTS_BIF_PREP_ERROR(res, BIF_P, EXC_ERROR);
    }
    return res;
}

BIF_RETTYPE port_command_2(BIF_ALIST_2)
{
    return do_port_command(BIF_P, BIF_ARG_1, BIF_ARG_2, NIL, 0);
}

BIF_RETTYPE port_command_3(BIF_ALIST_3)
{
    Eterm l = BIF_ARG_3;
    Uint32 flags = 0;
    while (is_list(l)) {
	Eterm* cons = list_val(l);
	Eterm car = CAR(cons);
	if (car == am_force) {
	    flags |= ERTS_PORT_COMMAND_FLAG_FORCE;
	} else if (car == am_nosuspend) {
	    flags |= ERTS_PORT_COMMAND_FLAG_NOSUSPEND;
	} else {
	    BIF_ERROR(BIF_P, BADARG);
	}
	l = CDR(cons);
    }
    if(!is_nil(l)) {
	BIF_ERROR(BIF_P, BADARG);
    }
    return do_port_command(BIF_P, BIF_ARG_1, BIF_ARG_2, BIF_ARG_3, flags);
}

BIF_RETTYPE port_call_2(BIF_ALIST_2)
{
    return port_call_3(BIF_P,BIF_ARG_1,make_small(0),BIF_ARG_2);
}

BIF_RETTYPE port_call_3(BIF_ALIST_3)
{
    Uint op;
    Port *p;
    Uint size;
    byte *bytes;
    byte *endp;
    size_t real_size;
    erts_driver_t *drv;
    byte port_input[256];	/* Default input buffer to encode in */
    byte port_result[256];	/* Buffer for result from port. */
    byte* port_resp;		/* Pointer to result buffer. */
    char *prc;
    int ret;
    Eterm res;
    Sint result_size;
    Eterm *hp;
    Eterm *hp_end;              /* To satisfy hybrid heap architecture */
    unsigned ret_flags = 0U;
    int fpe_was_unmasked;

    bytes = &port_input[0];
    port_resp = port_result;
    /* trace of port scheduling with virtual process descheduling
     * lock wait 
     */
    if (IS_TRACED_FL(BIF_P, F_TRACE_SCHED_PROCS)) {
    	trace_virtual_sched(BIF_P, am_out);
    }

    if (erts_system_profile_flags.runnable_procs && erts_system_profile_flags.exclusive) {
    	profile_runnable_proc(BIF_P, am_inactive);
    }

    p = id_or_name2port(BIF_P, BIF_ARG_1);
    if (!p) {
    error:
	if (port_resp != port_result && 
	    !(ret_flags & DRIVER_CALL_KEEP_BUFFER)) {
	    driver_free(port_resp);
	}
	if (bytes != &port_input[0])
	    erts_free(ERTS_ALC_T_PORT_CALL_BUF, bytes);
	/* Need to virtual schedule in the process if there
	 * was an error.
	 */
    	if (IS_TRACED_FL(BIF_P, F_TRACE_SCHED_PROCS)) {
    	    trace_virtual_sched(BIF_P, am_in);
    	}

	if (erts_system_profile_flags.runnable_procs && erts_system_profile_flags.exclusive) {
    	    profile_runnable_proc(BIF_P, am_active);
    	}

	if (p)
	    erts_port_release(p);
#ifdef ERTS_SMP
	ERTS_SMP_BIF_CHK_PENDING_EXIT(BIF_P, ERTS_PROC_LOCK_MAIN);
#else
	ERTS_BIF_CHK_EXITED(BIF_P);
#endif
	BIF_ERROR(BIF_P, BADARG);
    }

    if ((drv = p->drv_ptr) == NULL) {
	goto error;
    }
    if (drv->call == NULL) {
	goto error;
    }
    if (!term_to_Uint(BIF_ARG_2, &op)) {
	goto error;
    }
    p->caller = BIF_P->id;
    
    /* Lock taken, virtual schedule of port */
    if (IS_TRACED_FL(p, F_TRACE_SCHED_PORTS)) {
    	trace_sched_ports_where(p, am_in, am_call);
    }
    
    if (erts_system_profile_flags.runnable_ports && !erts_port_is_scheduled(p)) {
    	profile_runnable_port(p, am_active);
    }
    size = erts_encode_ext_size(BIF_ARG_3);
    if (size > sizeof(port_input))
	bytes = erts_alloc(ERTS_ALC_T_PORT_CALL_BUF, size);

    endp = bytes;
    erts_encode_ext(BIF_ARG_3, &endp);

    real_size = endp - bytes;
    if (real_size > size) {
	erl_exit(1, "%s, line %d: buffer overflow: %d word(s)\n",
		 __FILE__, __LINE__, endp - (bytes + size));
    }
    erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_MAIN);
    prc  = (char *) port_resp;
    fpe_was_unmasked = erts_block_fpe();
    ret = drv->call((ErlDrvData)p->drv_data, 
		    (unsigned) op,
		    (char *) bytes, 
		    (int) real_size,
		    &prc, 
		    (int) sizeof(port_result),
		    &ret_flags);
    erts_unblock_fpe(fpe_was_unmasked);
    if (IS_TRACED_FL(p, F_TRACE_SCHED_PORTS)) {
    	trace_sched_ports_where(p, am_out, am_call);
    }
    
    if (erts_system_profile_flags.runnable_ports && !erts_port_is_scheduled(p)) {
    	profile_runnable_port(p, am_inactive);
    }
   
    port_resp = (byte *) prc;
    p->caller = NIL;
    erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
#ifdef HARDDEBUG
    { 
	int z;
	printf("real_size = %ld,%d, ret = %d\r\n",real_size, 
	       (int) real_size, ret);
	printf("[");
	for(z = 0; z < real_size; ++z) {
	    printf("%d, ",(int) bytes[z]);
	}
	printf("]\r\n");
	printf("[");
	for(z = 0; z < ret; ++z) {
	    printf("%d, ",(int) port_resp[z]);
	}
	printf("]\r\n");
    }
#endif
    if (ret <= 0 || port_resp[0] != VERSION_MAGIC) { 
	/* Error or a binary without magic/ with wrong magic */
	goto error;
    }
    result_size = erts_decode_ext_size(port_resp, ret, 0);
    if (result_size < 0) {
	goto error;
    }
    hp = HAlloc(BIF_P, result_size);
    hp_end = hp + result_size;
    endp = port_resp;
    res = erts_decode_ext(&hp, &MSO(BIF_P), &endp);
    if (res == THE_NON_VALUE) {
	goto error;
    }
    HRelease(BIF_P, hp_end, hp);
    if (port_resp != port_result && !(ret_flags & DRIVER_CALL_KEEP_BUFFER)) {
	driver_free(port_resp);
    }
    if (bytes != &port_input[0])
	erts_free(ERTS_ALC_T_PORT_CALL_BUF, bytes);
    if (p)
	erts_port_release(p);
#ifdef ERTS_SMP
    ERTS_SMP_BIF_CHK_PENDING_EXIT(BIF_P, ERTS_PROC_LOCK_MAIN);
#else
    ERTS_BIF_CHK_EXITED(BIF_P);
#endif
    if (IS_TRACED_FL(BIF_P, F_TRACE_SCHED_PROCS)) {
    	trace_virtual_sched(BIF_P, am_in);
    }

    if (erts_system_profile_flags.runnable_procs && erts_system_profile_flags.exclusive) {
    	profile_runnable_proc(BIF_P, am_active);
    }
  
    return res;
}
    
BIF_RETTYPE port_control_3(BIF_ALIST_3)
{
    Port* p;
    Uint op;
    Eterm res = THE_NON_VALUE;
    
    /* Virtual schedule out calling process before lock wait */
    if (IS_TRACED_FL(BIF_P, F_TRACE_SCHED_PROCS)) {
	trace_virtual_sched(BIF_P, am_out);
    }

    if (erts_system_profile_flags.runnable_procs && erts_system_profile_flags.exclusive) {
    	profile_runnable_proc(BIF_P, am_inactive);
    }

    p = id_or_name2port(BIF_P, BIF_ARG_1);
    if (!p) {
    	/* Schedule the process before exiting */
    	if (IS_TRACED_FL(BIF_P, F_TRACE_SCHED_PROCS)) {
	    trace_virtual_sched(BIF_P, am_in);
    	}
	
	if (erts_system_profile_flags.runnable_procs && erts_system_profile_flags.exclusive) {
    	    profile_runnable_proc(BIF_P, am_active);
	}
	
	BIF_ERROR(BIF_P, BADARG);
    }

    /* Trace the port for scheduling in */
    if (IS_TRACED_FL(p, F_TRACE_SCHED_PORTS)) {
    	trace_sched_ports_where(p, am_in, am_control);
    }
    
    if (erts_system_profile_flags.runnable_ports && !erts_port_is_scheduled(p)) {
    	profile_runnable_port(p, am_active);
    }

    if (term_to_Uint(BIF_ARG_2, &op))
	res = erts_port_control(BIF_P, p, op, BIF_ARG_3);
    
    /* Trace the port for scheduling out */
    if (IS_TRACED_FL(p, F_TRACE_SCHED_PORTS)) {
    	trace_sched_ports_where(p, am_out, am_control);
    }

    if (erts_system_profile_flags.runnable_ports && !erts_port_is_scheduled(p)) {
    	profile_runnable_port(p, am_inactive);
    }

    erts_port_release(p);
#ifdef ERTS_SMP
    ERTS_SMP_BIF_CHK_PENDING_EXIT(BIF_P, ERTS_PROC_LOCK_MAIN);
#else
    ERTS_BIF_CHK_EXITED(BIF_P);
#endif
    
    if (IS_TRACED_FL(BIF_P, F_TRACE_SCHED_PROCS)) {
	trace_virtual_sched(BIF_P, am_in);
    }
    
    if (erts_system_profile_flags.runnable_procs && erts_system_profile_flags.exclusive) {
    	profile_runnable_proc(BIF_P, am_active);
    }
    
    if (is_non_value(res)) {
	BIF_ERROR(BIF_P, BADARG);
    }
    BIF_RET(res);
}

BIF_RETTYPE port_close_1(BIF_ALIST_1)
{
    Port* p;
    erts_smp_proc_unlock(BIF_P, ERTS_PROC_LOCK_MAIN);
    p = id_or_name2port(NULL, BIF_ARG_1);
    if (!p) {
	erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
	BIF_ERROR(BIF_P, BADARG);
    }
    erts_do_exit_port(p, p->connected, am_normal);
    /* if !ERTS_SMP: since we terminate port with reason normal 
       we SHOULD never get an exit signal ourselves
       */
    erts_port_release(p);
    erts_smp_proc_lock(BIF_P, ERTS_PROC_LOCK_MAIN);
    BIF_RET(am_true);
}

BIF_RETTYPE port_connect_2(BIF_ALIST_2)
{
    Port* prt;
    Process* rp;
    Eterm pid = BIF_ARG_2;

    if (is_not_internal_pid(pid)) {
    error:
	BIF_ERROR(BIF_P, BADARG);
    }
    prt = id_or_name2port(BIF_P, BIF_ARG_1);
    if (!prt) {
	goto error;
    }

    rp = erts_pid2proc(BIF_P, ERTS_PROC_LOCK_MAIN,
		       pid, ERTS_PROC_LOCK_LINK);
    if (!rp) {
	erts_smp_port_unlock(prt);
	ERTS_SMP_ASSERT_IS_NOT_EXITING(BIF_P);
	goto error;
    }

    erts_add_link(&(rp->nlinks), LINK_PID, prt->id);
    erts_add_link(&(prt->nlinks), LINK_PID, pid);

    erts_smp_proc_unlock(rp, ERTS_PROC_LOCK_LINK);

    prt->connected = pid; /* internal pid */
    erts_smp_port_unlock(prt);
    BIF_RET(am_true);
}

BIF_RETTYPE port_set_data_2(BIF_ALIST_2)
{
    Port* prt;
    Eterm portid = BIF_ARG_1;
    Eterm data   = BIF_ARG_2;

    prt = id_or_name2port(BIF_P, portid);
    if (!prt) {
	BIF_ERROR(BIF_P, BADARG);
    }
    if (prt->bp != NULL) {
	free_message_buffer(prt->bp);
	prt->bp = NULL;
    }
    if (IS_CONST(data)) {
	prt->data = data;
    } else {
	Uint size;
	ErlHeapFragment* bp;
	Eterm* hp;

	size = size_object(data);
	prt->bp = bp = new_message_buffer(size);
	hp = bp->mem;
	prt->data = copy_struct(data, size, &hp, &bp->off_heap);
    }
    erts_smp_port_unlock(prt);
    BIF_RET(am_true);
}


BIF_RETTYPE port_get_data_1(BIF_ALIST_1)
{
    BIF_RETTYPE res;
    Port* prt;
    Eterm portid = BIF_ARG_1;

    prt = id_or_name2port(BIF_P, portid);
    if (!prt) {
	BIF_ERROR(BIF_P, BADARG);
    }
    if (prt->bp == NULL) {	/* MUST be CONST! */
	res = prt->data;
    } else {
	Eterm* hp = HAlloc(BIF_P, prt->bp->used_size);
	res = copy_struct(prt->data, prt->bp->used_size, &hp, &MSO(BIF_P));
    }
    erts_smp_port_unlock(prt);
    BIF_RET(res);
}

/* 
 * Open a port. Most of the work is not done here but rather in
 * the file io.c.
 * Error returns: -1 or -2 returned from open_driver (-2 implies
 * that *err_nump contains the error code; -1 means we don't really know what happened),
 * -3 if argument parsing failed or we are out of ports (*err_nump should contain
 * either BADARG or SYSTEM_LIMIT).
 */

static int
open_port(Process* p, Eterm name, Eterm settings, int *err_nump)
{
#define OPEN_PORT_ERROR(VAL) do { port_num = (VAL); goto do_return; } while (0)
    int i, port_num;
    Eterm option;
    Uint arity;
    Eterm* tp;
    Uint* nargs;
    erts_driver_t* driver;
    char* name_buf = NULL;
    SysDriverOpts opts;
    int binary_io;
    int soft_eof;
    Sint linebuf;
    byte dir[MAXPATHLEN];

    /* These are the defaults */
    opts.packet_bytes = 0;
    opts.use_stdio = 1;
    opts.redir_stderr = 0;
    opts.read_write = 0;
    opts.hide_window = 0;
    opts.wd = NULL;
    opts.envir = NULL;
    opts.exit_status = 0;
    opts.overlapped_io = 0; 
    opts.spawn_type = ERTS_SPAWN_ANY; 
    opts.argv = NULL;
    binary_io = 0;
    soft_eof = 0;
    linebuf = 0;

    *err_nump = 0;

    if (is_not_list(settings) && is_not_nil(settings)) {
	goto badarg;
    }
    /*
     * Parse the settings.
     */

    if (is_not_nil(settings)) {
	nargs = list_val(settings);
	while (1) {
	    if (is_tuple_arity(*nargs, 2)) {
		tp = tuple_val(*nargs);
		arity = *tp++;
		option = *tp++;
		if (option == am_packet) {
		    if (is_not_small(*tp)) {
			goto badarg;
		    }
		    opts.packet_bytes = signed_val(*tp);
		    switch (opts.packet_bytes) {
		    case 1:
		    case 2:
		    case 4:
			break;
		    default:
			goto badarg;
		   }
		} else if (option == am_line) {
		    if (is_not_small(*tp)) {
			goto badarg;
		    }
		    linebuf = signed_val(*tp);
		    if (linebuf <= 0) {
			goto badarg;
		    }
		} else if (option == am_env) {
		    byte* bytes;
		    if ((bytes = convert_environment(p, *tp)) == NULL) {
			goto badarg;
		    }
		    opts.envir = (char *) bytes;
		} else if (option == am_args) {
		    char **av;
		    char **oav = opts.argv;
		    if ((av = convert_args(*tp)) == NULL) {
			goto badarg;
		    }
		    opts.argv = av;
		    if (oav) {
			opts.argv[0] = oav[0];
			oav[0] = erts_default_arg0;
			free_args(oav);
		    }

		} else if (option == am_arg0) {
		    char *a0;
		    int n;
		    if (is_nil(*tp)) {
			n = 0;
		    } else if( (n = is_string(*tp)) == 0) {
			goto badarg;
		    }
		    a0 = (char *) erts_alloc(ERTS_ALC_T_TMP, 
					    (n + 1) * sizeof(byte));
		    if (intlist_to_buf(*tp, a0, n) != n) {
			erl_exit(1, "%s:%d: Internal error\n",
				 __FILE__, __LINE__);
		    }
		    a0[n] = '\0';		    
		    if (opts.argv == NULL) {
			opts.argv = erts_alloc(ERTS_ALC_T_TMP, 
					       2 * sizeof(char **));
			opts.argv[0] = a0;
			opts.argv[1] = NULL;
		    } else {
			if (opts.argv[0] != erts_default_arg0) {
			    erts_free(ERTS_ALC_T_TMP, opts.argv[0]);
			}
			opts.argv[0] = a0;
		    }
		} else if (option == am_cd) {
		    Eterm iolist;
		    DeclareTmpHeap(heap,4,p);
		    int r;

		    UseTmpHeap(4,p);
		    heap[0] = *tp;
		    heap[1] = make_list(heap+2);
		    heap[2] = make_small(0);
		    heap[3] = NIL;
		    iolist = make_list(heap);
		    r = io_list_to_buf(iolist, (char*) dir, MAXPATHLEN);
		    UnUseTmpHeap(4,p);
		    if (r < 0) {
			goto badarg;
		    }
		    opts.wd = (char *) dir;
		} else {
		    goto badarg;
		}
	    } else if (*nargs == am_stream) {
		opts.packet_bytes = 0;
	    } else if (*nargs == am_use_stdio) {
		opts.use_stdio = 1;
	    } else if (*nargs == am_stderr_to_stdout) {
		opts.redir_stderr = 1;
	    } else if (*nargs == am_line) {
		linebuf = 512;
	    } else if (*nargs == am_nouse_stdio) {
		opts.use_stdio = 0;
	    } else if (*nargs == am_binary) {
		binary_io = 1;
	    } else if (*nargs == am_in) {
		opts.read_write |= DO_READ;
	    } else if (*nargs == am_out) {
		opts.read_write |= DO_WRITE;
	    } else if (*nargs == am_eof) {
		soft_eof = 1;
	    } else if (*nargs == am_hide) {
		opts.hide_window = 1;
	    } else if (*nargs == am_exit_status) {
		opts.exit_status = 1;
	    } else if (*nargs == am_overlapped_io) {
		opts.overlapped_io = 1;
	    } else {
		goto badarg;
	    }
	    if (is_nil(*++nargs)) 
		break;
	    if (is_not_list(*nargs)) {
		goto badarg;
	    }
	    nargs = list_val(*nargs);
	}
    }
    if (opts.read_write == 0)	/* implement default */
	opts.read_write = DO_READ|DO_WRITE;

    /* Mutually exclusive arguments. */
    if((linebuf && opts.packet_bytes) || 
       (opts.redir_stderr && !opts.use_stdio)) {
	goto badarg;
    }

    /*
     * Parse the first argument and start the appropriate driver.
     */
    
    if (is_atom(name) || (i = is_string(name))) {
	/* a vanilla port */
	if (is_atom(name)) {
	    name_buf = (char *) erts_alloc(ERTS_ALC_T_TMP,
					   atom_tab(atom_val(name))->len+1);
	    sys_memcpy((void *) name_buf,
		       (void *) atom_tab(atom_val(name))->name, 
		       atom_tab(atom_val(name))->len);
	    name_buf[atom_tab(atom_val(name))->len] = '\0';
	} else {
	    name_buf = (char *) erts_alloc(ERTS_ALC_T_TMP, i + 1);
	    if (intlist_to_buf(name, name_buf, i) != i)
		erl_exit(1, "%s:%d: Internal error\n", __FILE__, __LINE__);
	    name_buf[i] = '\0';
	}
	driver = &vanilla_driver;
    } else {   
	if (is_not_tuple(name)) {
	    goto badarg;		/* Not a process or fd port */
	}
	tp = tuple_val(name);
	arity = *tp++;

	if (arity == make_arityval(0)) {
	    goto badarg;
	}
    
	if (*tp == am_spawn || *tp == am_spawn_driver) {	/* A process port */
	    if (arity != make_arityval(2)) {
		goto badarg;
	    }
	    name = tp[1];
	    if (is_atom(name)) {
		name_buf = (char *) erts_alloc(ERTS_ALC_T_TMP,
					       atom_tab(atom_val(name))->len+1);
		sys_memcpy((void *) name_buf,
			   (void *) atom_tab(atom_val(name))->name, 
			   atom_tab(atom_val(name))->len);
		name_buf[atom_tab(atom_val(name))->len] = '\0';
	    } else if ((i = is_string(name))) {
		name_buf = (char *) erts_alloc(ERTS_ALC_T_TMP, i + 1);
		if (intlist_to_buf(name, name_buf, i) != i)
		    erl_exit(1, "%s:%d: Internal error\n", __FILE__, __LINE__);
		name_buf[i] = '\0';
	    } else {
		goto badarg;
	    }
	    if (*tp == am_spawn_driver) {
		opts.spawn_type = ERTS_SPAWN_DRIVER;
	    }
	    driver = &spawn_driver;
	} else if (*tp == am_spawn_executable) {	/* A program */
	    /*
	     * {spawn_executable,Progname}
	     */
	    
	    if (arity != make_arityval(2)) {
		goto badarg;
	    }
	    name = tp[1];
	    if (is_atom(name)) {
		name_buf = (char *) erts_alloc(ERTS_ALC_T_TMP,
					       atom_tab(atom_val(name))->len+1);
		sys_memcpy((void *) name_buf,
			   (void *) atom_tab(atom_val(name))->name, 
			   atom_tab(atom_val(name))->len);
		name_buf[atom_tab(atom_val(name))->len] = '\0';
	    } else if ((i = is_string(name))) {
		name_buf = (char *) erts_alloc(ERTS_ALC_T_TMP, i + 1);
		if (intlist_to_buf(name, name_buf, i) != i)
		    erl_exit(1, "%s:%d: Internal error\n", __FILE__, __LINE__);
		name_buf[i] = '\0';
	    } else {
		goto badarg;
	    }
	    opts.spawn_type = ERTS_SPAWN_EXECUTABLE;
	    driver = &spawn_driver;
	} else if (*tp == am_fd) { /* An fd port */
	    int n;
	    struct Sint_buf sbuf;
	    char* p;

	    if (arity != make_arityval(3)) {
		goto badarg;
	    }
	    if (is_not_small(tp[1]) || is_not_small(tp[2])) {
		goto badarg;
	    }
	    opts.ifd = unsigned_val(tp[1]);
	    opts.ofd = unsigned_val(tp[2]);

	    /* Syntesize name from input and output descriptor. */
	    name_buf = erts_alloc(ERTS_ALC_T_TMP,
				  2*sizeof(struct Sint_buf) + 2); 
	    p = Sint_to_buf(opts.ifd, &sbuf);
	    n = sys_strlen(p);
	    sys_strncpy(name_buf, p, n);
	    name_buf[n] = '/';
	    p = Sint_to_buf(opts.ofd, &sbuf);
	    sys_strcpy(name_buf+n+1, p);

	    driver = &fd_driver;
	} else {
	    goto badarg;
	}
    }

    if ((driver != &spawn_driver && opts.argv != NULL) ||
	(driver == &spawn_driver && 
	 opts.spawn_type != ERTS_SPAWN_EXECUTABLE && 
	 opts.argv != NULL)) {
	/* Argument vector only if explicit spawn_executable */
	goto badarg;
    }
	

    if (driver != &spawn_driver && opts.exit_status) {
	goto badarg;
    }
    
    if (IS_TRACED_FL(p, F_TRACE_SCHED_PROCS)) {
        trace_virtual_sched(p, am_out);
    }
    

    erts_smp_proc_unlock(p, ERTS_PROC_LOCK_MAIN);

    port_num = erts_open_driver(driver, p->id, name_buf, &opts, err_nump);

    erts_smp_proc_lock(p, ERTS_PROC_LOCK_MAIN);

    if (port_num < 0) {
	DEBUGF(("open_driver returned %d(%d)\n", port_num, *err_nump));
    	if (IS_TRACED_FL(p, F_TRACE_SCHED_PROCS)) {
            trace_virtual_sched(p, am_in);
    	}
	OPEN_PORT_ERROR(port_num);
    }
    
    if (IS_TRACED_FL(p, F_TRACE_SCHED_PROCS)) {
        trace_virtual_sched(p, am_in);
    }

    if (binary_io) {
	erts_port_status_bor_set(&erts_port[port_num],
				 ERTS_PORT_SFLG_BINARY_IO);
    }
    if (soft_eof) {
	erts_port_status_bor_set(&erts_port[port_num],
				 ERTS_PORT_SFLG_SOFT_EOF);
    }
    if (linebuf && erts_port[port_num].linebuf == NULL){
	erts_port[port_num].linebuf = allocate_linebuf(linebuf); 
	erts_port_status_bor_set(&erts_port[port_num],
				 ERTS_PORT_SFLG_LINEBUF_IO);
    }
 
 do_return:
    if (name_buf)
	erts_free(ERTS_ALC_T_TMP, (void *) name_buf);
    if (opts.argv) {
	free_args(opts.argv);
    }
    return port_num;
    
 badarg:
    *err_nump = BADARG;
    OPEN_PORT_ERROR(-3);
    goto do_return;
#undef OPEN_PORT_ERROR
}

static char **convert_args(Eterm l)
{
    char **pp;
    char *b;
    int n;
    int i = 0;
    Eterm str;
    /* We require at least one element in list (argv[0]) */
    if (is_not_list(l) && is_not_nil(l)) {
	return NULL;
    }
    n = list_length(l);
    pp = erts_alloc(ERTS_ALC_T_TMP, (n + 2) * sizeof(char **));
    pp[i++] = erts_default_arg0;
    while (is_list(l)) {
	str = CAR(list_val(l));

	if (is_nil(str)) {
	    n = 0;
	} else if( (n = is_string(str)) == 0) {
	    /* Not a string... */
	    int j;
	    for (j = 1; j < i; ++j)
		erts_free(ERTS_ALC_T_TMP, pp[j]);
	    erts_free(ERTS_ALC_T_TMP, pp);
	    return NULL;
	}
	b = (char *) erts_alloc(ERTS_ALC_T_TMP, (n + 1) * sizeof(byte));
	pp[i++] = (char *) b;
	if (intlist_to_buf(str, b, n) != n)
	    erl_exit(1, "%s:%d: Internal error\n", __FILE__, __LINE__);
	b[n] = '\0';
	l = CDR(list_val(l));
    }
    pp[i] = NULL;
    return pp;
}

static void free_args(char **av)
{
    int i;
    if (av == NULL)
	return;
    for (i = 0; av[i] != NULL; ++i) {
	if (av[i] != erts_default_arg0) {
	    erts_free(ERTS_ALC_T_TMP, av[i]);
	}
    }
    erts_free(ERTS_ALC_T_TMP, av);
}
    

static byte* convert_environment(Process* p, Eterm env)
{
    Eterm all;
    Eterm* temp_heap;
    Eterm* hp;
    Uint heap_size;
    int n;
    byte* bytes;

    if ((n = list_length(env)) < 0) {
	return NULL;
    }
    heap_size = 2*(5*n+1);
    temp_heap = hp = (Eterm *) erts_alloc(ERTS_ALC_T_TMP, heap_size*sizeof(Eterm));
    bytes = NULL;		/* Indicating error */

    /*
     * All errors below are handled by jumping to 'done', to ensure that the memory
     * gets deallocated. Do NOT return directly from this function.
     */

    all = CONS(hp, make_small(0), NIL);
    hp += 2;

    while(is_list(env)) {
	Eterm tmp;
	Eterm* tp;

	tmp = CAR(list_val(env));
	if (is_not_tuple_arity(tmp, 2)) {
	    goto done;
	}
	tp = tuple_val(tmp);
	tmp = CONS(hp, make_small(0), NIL);
	hp += 2;
	if (tp[2] != am_false) {
	    tmp = CONS(hp, tp[2], tmp);
	    hp += 2;
	}
	tmp = CONS(hp, make_small('='), tmp);
	hp += 2;
	tmp = CONS(hp, tp[1], tmp);
	hp += 2;
	all = CONS(hp, tmp, all);
	hp += 2;
	env = CDR(list_val(env));
    }
    if (is_not_nil(env)) {
	goto done;
    }
    if ((n = io_list_len(all)) < 0) {
	goto done;
    }

    /*
     * Put the result in a binary (no risk for a memory leak that way).
     */
    (void) erts_new_heap_binary(p, NULL, n, &bytes);
    io_list_to_buf(all, (char*)bytes, n);

 done:
    erts_free(ERTS_ALC_T_TMP, temp_heap);
    return bytes;
}

/* ------------ decode_packet() and friends: */

struct packet_callback_args
{
    Process* p;  /* In */
    Eterm res;   /* Out */
    int string_as_bin; /* return strings as binaries (http_bin): */
    byte* aligned_ptr;
    Uint bin_sz;
    Eterm orig;
    Uint bin_offs;
    byte bin_bitoffs;
};

#define in_area(ptr,start,nbytes) \
    ((unsigned long)((char*)(ptr) - (char*)(start)) < (nbytes))

static Eterm
http_bld_string(struct packet_callback_args* pca, Uint **hpp, Uint *szp,
		const char *str, Sint len)
{
    Eterm res = THE_NON_VALUE;
    Uint size;
    int make_subbin;

    if (pca->string_as_bin) {
	size = heap_bin_size(len);
	make_subbin = (size > ERL_SUB_BIN_SIZE
		       && in_area(str, pca->aligned_ptr, pca->bin_sz));
	if (szp) {
	    *szp += make_subbin ? ERL_SUB_BIN_SIZE : size;
	}
	if (hpp) {
	    res = make_binary(*hpp);
	    if (make_subbin) {
		ErlSubBin* bin = (ErlSubBin*) *hpp;
		bin->thing_word = HEADER_SUB_BIN;
		bin->size = len;
		bin->offs = pca->bin_offs + ((byte*)str - pca->aligned_ptr);
		bin->orig = pca->orig;
		bin->bitoffs = pca->bin_bitoffs;
		bin->bitsize = 0;
		bin->is_writable = 0;
		*hpp += ERL_SUB_BIN_SIZE;
	    }
	    else {
		ErlHeapBin* bin = (ErlHeapBin*) *hpp;
		bin->thing_word = header_heap_bin(len);
		bin->size = len;
		memcpy(bin->data, str, len);
		*hpp += size;
	    }
	}
    }
    else {
	res = erts_bld_string_n(hpp, szp, str, len);
    }
    return res;
}

static int http_response_erl(void *arg, int major, int minor,
                             int status, const char* phrase, int phrase_len)
{
    /* {http_response,{Major,Minor},Status,"Phrase"} */
    struct packet_callback_args* pca = (struct packet_callback_args*) arg;    
    Eterm phrase_term, ver;
    Uint hsize = 3 + 5;
    Eterm* hp;
#ifdef DEBUG
    Eterm* hend;
#endif

    http_bld_string(pca, NULL, &hsize, phrase, phrase_len);
    hp = HAlloc(pca->p, hsize);
#ifdef DEBUG
    hend = hp + hsize;
#endif
    phrase_term = http_bld_string(pca, &hp, NULL, phrase, phrase_len);
    ver = TUPLE2(hp, make_small(major), make_small(minor));
    hp += 3;
    pca->res = TUPLE4(hp, am_http_response, ver, make_small(status), phrase_term);
    ASSERT(hp+5==hend);
    return 1;
}   
    
static Eterm http_bld_uri(struct packet_callback_args* pca,
			  Eterm** hpp, Uint* szp, const PacketHttpURI* uri)
{
    Eterm s1, s2;
    if (uri->type == URI_STAR) {
        return am_Times; /* '*' */
    }

    s1 = http_bld_string(pca, hpp, szp, uri->s1_ptr, uri->s1_len);

    switch (uri->type) {
    case URI_ABS_PATH:
        return erts_bld_tuple(hpp, szp, 2, am_abs_path, s1);
    case URI_HTTP:
    case URI_HTTPS:
        s2 = http_bld_string(pca, hpp, szp, uri->s2_ptr, uri->s2_len);
        return erts_bld_tuple
            (hpp, szp, 5, am_absoluteURI, 
             ((uri->type==URI_HTTP) ? am_http : am_https),
             s1, 
             ((uri->port==0) ? am_undefined : make_small(uri->port)),
             s2);
        
    case URI_STRING:
        return s1;
    case URI_SCHEME:
        s2 = http_bld_string(pca, hpp, szp, uri->s2_ptr, uri->s2_len);
        return erts_bld_tuple(hpp, szp, 3, am_scheme, s1, s2);
                              
    default:
        erl_exit(1, "%s, line %d: type=%u\n", __FILE__, __LINE__, uri->type);
    }
}

static int http_request_erl(void* arg, const http_atom_t* meth,
                            const char* meth_ptr, int meth_len,
                            const PacketHttpURI* uri, int major, int minor)
{
    struct packet_callback_args* pca = (struct packet_callback_args*) arg;    
    Eterm meth_term, uri_term, ver_term;
    Uint sz = 0;
    Uint* szp = &sz;
    Eterm* hp;
    Eterm** hpp = NULL;

    /* {http_request,Meth,Uri,Version} */

    for (;;) {
        meth_term = (meth!=NULL) ? meth->atom :
	    http_bld_string(pca, hpp, szp, meth_ptr, meth_len);
        uri_term = http_bld_uri(pca, hpp, szp, uri);
        ver_term = erts_bld_tuple(hpp, szp, 2,
                                  make_small(major), make_small(minor));
        pca->res = erts_bld_tuple(hpp, szp, 4, am_http_request, meth_term,
                                  uri_term, ver_term); 
        if (hpp != NULL) break;
        hpp = &hp;
        hp = HAlloc(pca->p, sz);
        szp = NULL;        
    }
    return 1;
}

static int
http_header_erl(void* arg, const http_atom_t* name, const char* name_ptr,
                int name_len, const char* value_ptr, int value_len)
{
    struct packet_callback_args* pca = (struct packet_callback_args*) arg;    
    Eterm bit_term, name_term, val_term;
    Uint sz = 6;
    Eterm* hp;
#ifdef DEBUG
    Eterm* hend;
#endif
    
    /* {http_header,Bit,Name,IValue,Value} */

    if (name == NULL) {
	http_bld_string(pca, NULL, &sz, name_ptr, name_len);
    }
    http_bld_string(pca, NULL, &sz, value_ptr, value_len);

    hp = HAlloc(pca->p, sz);
#ifdef DEBUG
    hend = hp + sz;
#endif	

    if (name != NULL) {
	bit_term = make_small(name->index+1);
	name_term = name->atom;
    }
    else {	
	bit_term = make_small(0);	
	name_term = http_bld_string(pca, &hp,NULL,name_ptr,name_len);
    }

    val_term = http_bld_string(pca, &hp, NULL, value_ptr, value_len);
    pca->res = TUPLE5(hp, am_http_header, bit_term, name_term, am_undefined, val_term);
    ASSERT(hp+6==hend);
    return 1;
}   

static int http_eoh_erl(void* arg)
{
    /* http_eoh */
    struct packet_callback_args* pca = (struct packet_callback_args*) arg;    
    pca->res = am_http_eoh;
    return 1;
}

static int http_error_erl(void* arg, const char* buf, int len)
{
    /* {http_error,Line} */
    struct packet_callback_args* pca = (struct packet_callback_args*) arg;
    Uint sz = 3;
    Eterm* hp;
#ifdef DEBUG
    Eterm* hend;
#endif

    http_bld_string(pca, NULL, &sz, buf, len);

    hp = HAlloc(pca->p, sz);
#ifdef DEBUG
    hend = hp + sz;
#endif
    pca->res = erts_bld_tuple(&hp, NULL, 2, am_http_error,
			      http_bld_string(pca, &hp, NULL, buf, len));
    ASSERT(hp==hend);
    return 1;
}

static
int ssl_tls_erl(void* arg, unsigned type, unsigned major, unsigned minor,
		const char* buf, int len, const char* prefix, int plen)
{
    struct packet_callback_args* pca = (struct packet_callback_args*) arg;
    Eterm* hp;
    Eterm ver;
    Eterm bin = new_binary(pca->p, NULL, plen+len);
    byte* bin_ptr = binary_bytes(bin);

    memcpy(bin_ptr+plen, buf, len);
    if (plen) {
        memcpy(bin_ptr, prefix, plen);
    }

    /* {ssl_tls,NIL,ContentType,{Major,Minor},Bin} */
    hp = HAlloc(pca->p, 3+6);
    ver = TUPLE2(hp, make_small(major), make_small(minor));
    hp += 3;
    pca->res = TUPLE5(hp, am_ssl_tls, NIL, make_small(type), ver, bin);
    return 1;
}


PacketCallbacks packet_callbacks_erl = {
    http_response_erl,
    http_request_erl,
    http_eoh_erl,
    http_header_erl,
    http_error_erl,
    ssl_tls_erl
};

/*
 decode_packet(Type,Bin,Options)
 Returns:
     {ok, PacketBodyBin, RestBin}
     {more, PacketSz | undefined}
     {error, invalid}
*/
BIF_RETTYPE decode_packet_3(BIF_ALIST_3)
{
    unsigned max_plen = 0;   /* Packet max length, 0=no limit */
    unsigned trunc_len = 0;  /* Truncate lines if longer, 0=no limit */
    int http_state = 0;      /* 0=request/response 1=header */
    int packet_sz;           /*-------Binaries involved: ------------------*/
    byte* bin_ptr;           /*| orig: original binary                     */
    byte bin_bitsz;          /*| bin: BIF_ARG_2, may be sub-binary of orig */
	                     /*| packet: prefix of bin                     */
    char* body_ptr;          /*| body: part of packet to return            */
    int body_sz;             /*| rest: bin without packet                  */
    struct packet_callback_args pca;
    enum PacketParseType type;
    Eterm* hp;
    Eterm* hend;
    ErlSubBin* rest;
    Eterm res;
    Eterm options;
    int code;

    if (!is_binary(BIF_ARG_2) || 
        (!is_list(BIF_ARG_3) && !is_nil(BIF_ARG_3))) {
        BIF_ERROR(BIF_P, BADARG);
    }
    switch (BIF_ARG_1) {
    case make_small(0): case am_raw: type = TCP_PB_RAW; break;
    case make_small(1): type = TCP_PB_1; break;
    case make_small(2): type = TCP_PB_2; break;
    case make_small(4): type = TCP_PB_4; break;
    case am_asn1: type = TCP_PB_ASN1; break;
    case am_sunrm: type = TCP_PB_RM; break;
    case am_cdr: type = TCP_PB_CDR; break;
    case am_fcgi: type = TCP_PB_FCGI; break;
    case am_line: type = TCP_PB_LINE_LF; break;
    case am_tpkt: type = TCP_PB_TPKT; break;
    case am_http: type = TCP_PB_HTTP; break;
    case am_httph: type = TCP_PB_HTTPH; break;
    case am_http_bin: type = TCP_PB_HTTP_BIN; break;
    case am_httph_bin: type = TCP_PB_HTTPH_BIN; break;
    case am_ssl_tls: type = TCP_PB_SSL_TLS; break;
    default:
        BIF_ERROR(BIF_P, BADARG);
    }

    options = BIF_ARG_3;
    while (!is_nil(options)) {
        Eterm* cons = list_val(options);
        if (is_tuple(CAR(cons))) {
            Eterm* tpl = tuple_val(CAR(cons));
            Uint val;
            if (tpl[0] == make_arityval(2) &&
		term_to_Uint(tpl[2],&val) && val <= UINT_MAX) {
                switch (tpl[1]) {
                case am_packet_size:
                    max_plen = val;
                    goto next_option;
                case am_line_length:
                    trunc_len = val;
                    goto next_option;
                }
            }
        }
        BIF_ERROR(BIF_P, BADARG);

    next_option:       
        options = CDR(cons);
    }


    pca.bin_sz = binary_size(BIF_ARG_2);
    ERTS_GET_BINARY_BYTES(BIF_ARG_2, bin_ptr, pca.bin_bitoffs, bin_bitsz);  
    if (pca.bin_bitoffs != 0) {
        pca.aligned_ptr = erts_alloc(ERTS_ALC_T_TMP, pca.bin_sz);
        erts_copy_bits(bin_ptr, pca.bin_bitoffs, 1, pca.aligned_ptr, 0, 1, pca.bin_sz*8);
    }
    else {
        pca.aligned_ptr = bin_ptr;
    }
    packet_sz = packet_get_length(type, (char*)pca.aligned_ptr, pca.bin_sz,
                                  max_plen, trunc_len, &http_state);
    if (!(packet_sz > 0 && packet_sz <= pca.bin_sz)) {
        if (packet_sz < 0) {
	    goto error;
        }
        else { /* not enough data */
            Eterm plen = (packet_sz==0) ? am_undefined : 
                erts_make_integer(packet_sz, BIF_P);
            Eterm* hp = HAlloc(BIF_P,3);        
            res = TUPLE2(hp, am_more, plen);
            goto done;
        }
    }
    /* We got a whole packet */

    body_ptr = (char*) pca.aligned_ptr;
    body_sz = packet_sz;
    packet_get_body(type, (const char**) &body_ptr, &body_sz);

    ERTS_GET_REAL_BIN(BIF_ARG_2, pca.orig, pca.bin_offs, pca.bin_bitoffs, bin_bitsz);
    pca.p = BIF_P;
    pca.res = THE_NON_VALUE;
    pca.string_as_bin = (type == TCP_PB_HTTP_BIN || type == TCP_PB_HTTPH_BIN);
    code = packet_parse(type, (char*)pca.aligned_ptr, packet_sz, &http_state,
			&packet_callbacks_erl, &pca);
    if (code == 0) { /* no special packet parsing, make plain binary */
        ErlSubBin* body;
        Uint hsz = 2*ERL_SUB_BIN_SIZE + 4;
        hp = HAlloc(BIF_P, hsz);
        hend = hp + hsz;

        body = (ErlSubBin *) hp;
        body->thing_word = HEADER_SUB_BIN;
        body->size = body_sz;
        body->offs = pca.bin_offs + (body_ptr - (char*)pca.aligned_ptr);
        body->orig = pca.orig;
        body->bitoffs = pca.bin_bitoffs;
        body->bitsize = 0;
        body->is_writable = 0;
        hp += ERL_SUB_BIN_SIZE;
        pca.res = make_binary(body);
    }
    else if (code > 0) {
	Uint hsz = ERL_SUB_BIN_SIZE + 4;
	ASSERT(pca.res != THE_NON_VALUE);
	hp = HAlloc(BIF_P, hsz);
	hend = hp + hsz;
    }
    else {
error:
	hp = HAlloc(BIF_P,3);        
	res = TUPLE2(hp, am_error, am_invalid);
	goto done;
    }

    rest = (ErlSubBin *) hp;
    rest->thing_word = HEADER_SUB_BIN;
    rest->size = pca.bin_sz - packet_sz;
    rest->offs = pca.bin_offs + packet_sz;
    rest->orig = pca.orig;
    rest->bitoffs = pca.bin_bitoffs;
    rest->bitsize = bin_bitsz;   /* The extra bits go into the rest. */
    rest->is_writable = 0;
    hp += ERL_SUB_BIN_SIZE;
    res = TUPLE3(hp, am_ok, pca.res, make_binary(rest));
    hp += 4;
    ASSERT(hp==hend); (void)hend;

done:
    if (pca.aligned_ptr != bin_ptr) {
        erts_free(ERTS_ALC_T_TMP, pca.aligned_ptr);
    }
    BIF_RET(res);
}