Class: DL::CFunc

Inherits:
Object
  • Object
show all
Defined in:
cfunc.c,
cfunc.c

Overview

A direct accessor to a function in a C library

Example

libc_so = "/lib64/libc.so.6"
=> "/lib64/libc.so.6"
libc = DL::dlopen(libc_so)
=> #<DL::Handle:0x00000000e05b00>
@cfunc = DL::CFunc.new(libc['strcpy'], DL::TYPE_VOIDP, 'strcpy')
=> #<DL::CFunc:0x000000012daec0 ptr=0x007f62ca5a8300 type=1 name='strcpy'>

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#DL::CFunc.new(address, type = DL::TYPE_VOID, name = nil, calltype = :cdecl) ⇒ Object

Create a new function that points to address with an optional return type of type, a name of name and a calltype of calltype.



151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
 
# File 'cfunc.c', line 151

static VALUE
rb_dlcfunc_initialize(int argc, VALUE argv[], VALUE self)
{
    VALUE addr, name, type, calltype, addrnum;
    struct cfunc_data *data;
    void *saddr;
    const char *sname;

    rb_scan_args(argc, argv, "13", &addr, &type, &name, &calltype);

    addrnum = rb_Integer(addr);
    saddr = (void*)(NUM2PTR(addrnum));
    sname = NIL_P(name) ? NULL : StringValuePtr(name);

    TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, data);
    if( data->name ) xfree(data->name);
    data->ptr  = saddr;
    data->name = sname ? strdup(sname) : 0;
    data->type = NIL_P(type) ? DLTYPE_VOID : NUM2INT(type);
    data->calltype = NIL_P(calltype) ? CFUNC_CDECL : SYM2ID(calltype);
    data->wrap = (addrnum == addr) ? 0 : addr;

    return Qnil;
}

Class Method Details

.last_error ⇒ Object

Returns the last error for the current executing thread



14
15
16
17
18
 
# File 'cfunc.c', line 14

static VALUE
rb_dl_get_last_error(VALUE self)
{
    return rb_thread_local_aref(rb_thread_current(), id_last_error);
}

.win32_last_error ⇒ Object

Returns the last win32 error for the current executing thread



31
32
33
34
35
 
# File 'cfunc.c', line 31

static VALUE
rb_dl_get_win32_last_error(VALUE self)
{
    return rb_thread_local_aref(rb_thread_current(), id_win32_last_error);
}

Instance Method Details

#call(ary) ⇒ Object #[](ary) ⇒ Object

Calls the function pointer passing in ary as values to the underlying C function. The return value depends on the ctype.



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
 
# File 'cfunc.c', line 340

static VALUE
rb_dlcfunc_call(VALUE self, VALUE ary)
{
    struct cfunc_data *cfunc;
    int i;
    DLSTACK_TYPE stack[DLSTACK_SIZE];
    VALUE result = Qnil;

    memset(stack, 0, sizeof(DLSTACK_TYPE) * DLSTACK_SIZE);
    Check_Type(ary, T_ARRAY);

    TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, cfunc);

    if( cfunc->ptr == 0 ){
	rb_raise(rb_eDLError, "can't call null-function");
	return Qnil;
    }

    for( i = 0; i < RARRAY_LEN(ary); i++ ){
	VALUE arg;
	if( i >= DLSTACK_SIZE ){
	    rb_raise(rb_eDLError, "too many arguments (stack overflow)");
	}
	arg = rb_to_int(RARRAY_PTR(ary)[i]);
	rb_check_safe_obj(arg);
	if (FIXNUM_P(arg)) {
	    stack[i] = (DLSTACK_TYPE)FIX2LONG(arg);
	}
	else if (RB_TYPE_P(arg, T_BIGNUM)) {
            unsigned long ls[(sizeof(DLSTACK_TYPE) + sizeof(long) - 1)/sizeof(long)];
            DLSTACK_TYPE d;
            int j;
            rb_big_pack(arg, ls, sizeof(ls)/sizeof(*ls));
            d = 0;
            for (j = 0; j < (int)(sizeof(ls)/sizeof(*ls)); j++)
                d |= (DLSTACK_TYPE)ls[j] << (j * sizeof(long) * CHAR_BIT);
	    stack[i] = d;
	}
	else {
	    Check_Type(arg, T_FIXNUM);
	}
    }

    /* calltype == CFUNC_CDECL */
    if( cfunc->calltype == CFUNC_CDECL
#ifndef FUNC_STDCALL
	|| cfunc->calltype == CFUNC_STDCALL
#endif
	){
	switch( cfunc->type ){
	case DLTYPE_VOID:
#define CASE(n) case n: { \
	    DECL_FUNC_CDECL(f,void,DLSTACK_PROTO##n,cfunc->ptr); \
	    f(DLSTACK_ARGS##n(stack)); \
	    result = Qnil; \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_VOIDP:
#define CASE(n) case n: { \
	    DECL_FUNC_CDECL(f,void*,DLSTACK_PROTO##n,cfunc->ptr); \
	    void * ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = PTR2NUM(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_CHAR:
#define CASE(n) case n: { \
	    DECL_FUNC_CDECL(f,char,DLSTACK_PROTO##n,cfunc->ptr); \
	    char ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = CHR2FIX(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_SHORT:
#define CASE(n) case n: { \
	    DECL_FUNC_CDECL(f,short,DLSTACK_PROTO##n,cfunc->ptr); \
	    short ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = INT2NUM((int)ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_INT:
#define CASE(n) case n: { \
	    DECL_FUNC_CDECL(f,int,DLSTACK_PROTO##n,cfunc->ptr); \
	    int ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = INT2NUM(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_LONG:
#define CASE(n) case n: { \
	    DECL_FUNC_CDECL(f,long,DLSTACK_PROTO##n,cfunc->ptr); \
	    long ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = LONG2NUM(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
#if HAVE_LONG_LONG  /* used in ruby.h */
	case DLTYPE_LONG_LONG:
#define CASE(n) case n: { \
	    DECL_FUNC_CDECL(f,LONG_LONG,DLSTACK_PROTO##n,cfunc->ptr); \
	    LONG_LONG ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = LL2NUM(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
#endif
	case DLTYPE_FLOAT:
#define CASE(n) case n: { \
	    DECL_FUNC_CDECL(f,float,DLSTACK_PROTO##n,cfunc->ptr); \
	    float ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = rb_float_new(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_DOUBLE:
#define CASE(n) case n: { \
	    DECL_FUNC_CDECL(f,double,DLSTACK_PROTO##n,cfunc->ptr); \
	    double ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = rb_float_new(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	default:
	    rb_raise(rb_eDLTypeError, "unknown type %d", cfunc->type);
	}
    }
#ifdef FUNC_STDCALL
    else if( cfunc->calltype == CFUNC_STDCALL ){
	/* calltype == CFUNC_STDCALL */
	switch( cfunc->type ){
	case DLTYPE_VOID:
#define CASE(n) case n: { \
	    DECL_FUNC_STDCALL(f,void,DLSTACK_PROTO##n##_,cfunc->ptr); \
	    f(DLSTACK_ARGS##n(stack)); \
	    result = Qnil; \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_VOIDP:
#define CASE(n) case n: { \
	    DECL_FUNC_STDCALL(f,void*,DLSTACK_PROTO##n##_,cfunc->ptr); \
	    void * ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = PTR2NUM(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_CHAR:
#define CASE(n) case n: { \
	    DECL_FUNC_STDCALL(f,char,DLSTACK_PROTO##n##_,cfunc->ptr); \
	    char ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = CHR2FIX(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_SHORT:
#define CASE(n) case n: { \
	    DECL_FUNC_STDCALL(f,short,DLSTACK_PROTO##n##_,cfunc->ptr); \
	    short ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = INT2NUM((int)ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_INT:
#define CASE(n) case n: { \
	    DECL_FUNC_STDCALL(f,int,DLSTACK_PROTO##n##_,cfunc->ptr); \
	    int ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = INT2NUM(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_LONG:
#define CASE(n) case n: { \
	    DECL_FUNC_STDCALL(f,long,DLSTACK_PROTO##n##_,cfunc->ptr); \
	    long ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = LONG2NUM(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
#if HAVE_LONG_LONG  /* used in ruby.h */
	case DLTYPE_LONG_LONG:
#define CASE(n) case n: { \
	    DECL_FUNC_STDCALL(f,LONG_LONG,DLSTACK_PROTO##n##_,cfunc->ptr); \
	    LONG_LONG ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = LL2NUM(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
#endif
	case DLTYPE_FLOAT:
#define CASE(n) case n: { \
	    DECL_FUNC_STDCALL(f,float,DLSTACK_PROTO##n##_,cfunc->ptr); \
	    float ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = rb_float_new(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_DOUBLE:
#define CASE(n) case n: { \
	    DECL_FUNC_STDCALL(f,double,DLSTACK_PROTO##n##_,cfunc->ptr); \
	    double ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = rb_float_new(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	default:
	    rb_raise(rb_eDLTypeError, "unknown type %d", cfunc->type);
	}
    }
#endif
    else{
	const char *name = rb_id2name(cfunc->calltype);
	if( name ){
	    rb_raise(rb_eDLError, "unsupported call type: %s",
		     name);
	}
	else{
	    rb_raise(rb_eDLError, "unsupported call type: %"PRIxVALUE,
		     cfunc->calltype);
	}
    }

    rb_dl_set_last_error(self, INT2NUM(errno));
#if defined(_WIN32)
    rb_dl_set_win32_last_error(self, INT2NUM(GetLastError()));
#endif

    return result;
}

#call(ary) ⇒ Object #[](ary) ⇒ Object

Calls the function pointer passing in ary as values to the underlying C function. The return value depends on the ctype.



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
 
# File 'cfunc.c', line 340

static VALUE
rb_dlcfunc_call(VALUE self, VALUE ary)
{
    struct cfunc_data *cfunc;
    int i;
    DLSTACK_TYPE stack[DLSTACK_SIZE];
    VALUE result = Qnil;

    memset(stack, 0, sizeof(DLSTACK_TYPE) * DLSTACK_SIZE);
    Check_Type(ary, T_ARRAY);

    TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, cfunc);

    if( cfunc->ptr == 0 ){
	rb_raise(rb_eDLError, "can't call null-function");
	return Qnil;
    }

    for( i = 0; i < RARRAY_LEN(ary); i++ ){
	VALUE arg;
	if( i >= DLSTACK_SIZE ){
	    rb_raise(rb_eDLError, "too many arguments (stack overflow)");
	}
	arg = rb_to_int(RARRAY_PTR(ary)[i]);
	rb_check_safe_obj(arg);
	if (FIXNUM_P(arg)) {
	    stack[i] = (DLSTACK_TYPE)FIX2LONG(arg);
	}
	else if (RB_TYPE_P(arg, T_BIGNUM)) {
            unsigned long ls[(sizeof(DLSTACK_TYPE) + sizeof(long) - 1)/sizeof(long)];
            DLSTACK_TYPE d;
            int j;
            rb_big_pack(arg, ls, sizeof(ls)/sizeof(*ls));
            d = 0;
            for (j = 0; j < (int)(sizeof(ls)/sizeof(*ls)); j++)
                d |= (DLSTACK_TYPE)ls[j] << (j * sizeof(long) * CHAR_BIT);
	    stack[i] = d;
	}
	else {
	    Check_Type(arg, T_FIXNUM);
	}
    }

    /* calltype == CFUNC_CDECL */
    if( cfunc->calltype == CFUNC_CDECL
#ifndef FUNC_STDCALL
	|| cfunc->calltype == CFUNC_STDCALL
#endif
	){
	switch( cfunc->type ){
	case DLTYPE_VOID:
#define CASE(n) case n: { \
	    DECL_FUNC_CDECL(f,void,DLSTACK_PROTO##n,cfunc->ptr); \
	    f(DLSTACK_ARGS##n(stack)); \
	    result = Qnil; \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_VOIDP:
#define CASE(n) case n: { \
	    DECL_FUNC_CDECL(f,void*,DLSTACK_PROTO##n,cfunc->ptr); \
	    void * ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = PTR2NUM(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_CHAR:
#define CASE(n) case n: { \
	    DECL_FUNC_CDECL(f,char,DLSTACK_PROTO##n,cfunc->ptr); \
	    char ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = CHR2FIX(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_SHORT:
#define CASE(n) case n: { \
	    DECL_FUNC_CDECL(f,short,DLSTACK_PROTO##n,cfunc->ptr); \
	    short ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = INT2NUM((int)ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_INT:
#define CASE(n) case n: { \
	    DECL_FUNC_CDECL(f,int,DLSTACK_PROTO##n,cfunc->ptr); \
	    int ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = INT2NUM(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_LONG:
#define CASE(n) case n: { \
	    DECL_FUNC_CDECL(f,long,DLSTACK_PROTO##n,cfunc->ptr); \
	    long ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = LONG2NUM(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
#if HAVE_LONG_LONG  /* used in ruby.h */
	case DLTYPE_LONG_LONG:
#define CASE(n) case n: { \
	    DECL_FUNC_CDECL(f,LONG_LONG,DLSTACK_PROTO##n,cfunc->ptr); \
	    LONG_LONG ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = LL2NUM(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
#endif
	case DLTYPE_FLOAT:
#define CASE(n) case n: { \
	    DECL_FUNC_CDECL(f,float,DLSTACK_PROTO##n,cfunc->ptr); \
	    float ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = rb_float_new(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_DOUBLE:
#define CASE(n) case n: { \
	    DECL_FUNC_CDECL(f,double,DLSTACK_PROTO##n,cfunc->ptr); \
	    double ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = rb_float_new(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	default:
	    rb_raise(rb_eDLTypeError, "unknown type %d", cfunc->type);
	}
    }
#ifdef FUNC_STDCALL
    else if( cfunc->calltype == CFUNC_STDCALL ){
	/* calltype == CFUNC_STDCALL */
	switch( cfunc->type ){
	case DLTYPE_VOID:
#define CASE(n) case n: { \
	    DECL_FUNC_STDCALL(f,void,DLSTACK_PROTO##n##_,cfunc->ptr); \
	    f(DLSTACK_ARGS##n(stack)); \
	    result = Qnil; \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_VOIDP:
#define CASE(n) case n: { \
	    DECL_FUNC_STDCALL(f,void*,DLSTACK_PROTO##n##_,cfunc->ptr); \
	    void * ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = PTR2NUM(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_CHAR:
#define CASE(n) case n: { \
	    DECL_FUNC_STDCALL(f,char,DLSTACK_PROTO##n##_,cfunc->ptr); \
	    char ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = CHR2FIX(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_SHORT:
#define CASE(n) case n: { \
	    DECL_FUNC_STDCALL(f,short,DLSTACK_PROTO##n##_,cfunc->ptr); \
	    short ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = INT2NUM((int)ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_INT:
#define CASE(n) case n: { \
	    DECL_FUNC_STDCALL(f,int,DLSTACK_PROTO##n##_,cfunc->ptr); \
	    int ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = INT2NUM(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_LONG:
#define CASE(n) case n: { \
	    DECL_FUNC_STDCALL(f,long,DLSTACK_PROTO##n##_,cfunc->ptr); \
	    long ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = LONG2NUM(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
#if HAVE_LONG_LONG  /* used in ruby.h */
	case DLTYPE_LONG_LONG:
#define CASE(n) case n: { \
	    DECL_FUNC_STDCALL(f,LONG_LONG,DLSTACK_PROTO##n##_,cfunc->ptr); \
	    LONG_LONG ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = LL2NUM(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
#endif
	case DLTYPE_FLOAT:
#define CASE(n) case n: { \
	    DECL_FUNC_STDCALL(f,float,DLSTACK_PROTO##n##_,cfunc->ptr); \
	    float ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = rb_float_new(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	case DLTYPE_DOUBLE:
#define CASE(n) case n: { \
	    DECL_FUNC_STDCALL(f,double,DLSTACK_PROTO##n##_,cfunc->ptr); \
	    double ret; \
	    ret = f(DLSTACK_ARGS##n(stack)); \
	    result = rb_float_new(ret); \
}
	    CALL_CASE;
#undef CASE
	    break;
	default:
	    rb_raise(rb_eDLTypeError, "unknown type %d", cfunc->type);
	}
    }
#endif
    else{
	const char *name = rb_id2name(cfunc->calltype);
	if( name ){
	    rb_raise(rb_eDLError, "unsupported call type: %s",
		     name);
	}
	else{
	    rb_raise(rb_eDLError, "unsupported call type: %"PRIxVALUE,
		     cfunc->calltype);
	}
    }

    rb_dl_set_last_error(self, INT2NUM(errno));
#if defined(_WIN32)
    rb_dl_set_win32_last_error(self, INT2NUM(GetLastError()));
#endif

    return result;
}

#calltype ⇒ Object

Get the call type of this function.



229
230
231
232
233
234
235
236
 
# File 'cfunc.c', line 229

static VALUE
rb_dlcfunc_calltype(VALUE self)
{
    struct cfunc_data *cfunc;

    TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, cfunc);
    return ID2SYM(cfunc->calltype);
}

#calltype=(symbol) ⇒ Object

Set the call type for this function.



244
245
246
247
248
249
250
251
252
 
# File 'cfunc.c', line 244

static VALUE
rb_dlcfunc_set_calltype(VALUE self, VALUE sym)
{
    struct cfunc_data *cfunc;

    TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, cfunc);
    cfunc->calltype = SYM2ID(sym);
    return sym;
}

#ctype ⇒ Numeric

Get the C function return value type. See DL for a list of constants corresponding to this method’s return value.

Returns:

  • (Numeric) 


198
199
200
201
202
203
204
205
 
# File 'cfunc.c', line 198

static VALUE
rb_dlcfunc_ctype(VALUE self)
{
    struct cfunc_data *cfunc;

    TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, cfunc);
    return INT2NUM(cfunc->type);
}

#ctype=(type) ⇒ Object

Set the C function return value type to type.



213
214
215
216
217
218
219
220
221
 
# File 'cfunc.c', line 213

static VALUE
rb_dlcfunc_set_ctype(VALUE self, VALUE ctype)
{
    struct cfunc_data *cfunc;

    TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, cfunc);
    cfunc->type = NUM2INT(ctype);
    return ctype;
}

#inspect ⇒ Object #to_s ⇒ Object

Returns a string formatted with an easily readable representation of the internal state of the DL::CFunc



294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
 
# File 'cfunc.c', line 294

static VALUE
rb_dlcfunc_inspect(VALUE self)
{
    VALUE val;
    struct cfunc_data *cfunc;

    TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, cfunc);

    val = rb_sprintf("#<DL::CFunc:%p ptr=%p type=%d name='%s'>",
	     cfunc,
	     cfunc->ptr,
	     cfunc->type,
	     cfunc->name ? cfunc->name : "");
    OBJ_TAINT(val);
    return val;
}

#name ⇒ String

Get the name of this function

Returns:

  • (String) 


182
183
184
185
186
187
188
189
 
# File 'cfunc.c', line 182

static VALUE
rb_dlcfunc_name(VALUE self)
{
    struct cfunc_data *cfunc;

    TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, cfunc);
    return cfunc->name ? rb_tainted_str_new2(cfunc->name) : Qnil;
}

#ptr ⇒ Object

Get the underlying function pointer as a DL::CPtr object.



260
261
262
263
264
265
266
267
 
# File 'cfunc.c', line 260

static VALUE
rb_dlcfunc_ptr(VALUE self)
{
    struct cfunc_data *cfunc;

    TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, cfunc);
    return PTR2NUM(cfunc->ptr);
}

#ptr=(pointer) ⇒ Object

Set the underlying function pointer to a DL::CPtr named pointer.



275
276
277
278
279
280
281
282
283
284
 
# File 'cfunc.c', line 275

static VALUE
rb_dlcfunc_set_ptr(VALUE self, VALUE addr)
{
    struct cfunc_data *cfunc;

    TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, cfunc);
    cfunc->ptr = NUM2PTR(addr);

    return Qnil;
}

#to_i ⇒ Integer

Returns the memory location of this function pointer as an integer.

Returns:

  • (Integer) 


614
615
616
617
618
619
620
621
 
# File 'cfunc.c', line 614

static VALUE
rb_dlcfunc_to_i(VALUE self)
{
  struct cfunc_data *cfunc;

  TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, cfunc);
  return PTR2NUM(cfunc->ptr);
}

#inspect ⇒ Object #to_s ⇒ Object

Returns a string formatted with an easily readable representation of the internal state of the DL::CFunc



294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
 
# File 'cfunc.c', line 294

static VALUE
rb_dlcfunc_inspect(VALUE self)
{
    VALUE val;
    struct cfunc_data *cfunc;

    TypedData_Get_Struct(self, struct cfunc_data, &dlcfunc_data_type, cfunc);

    val = rb_sprintf("#<DL::CFunc:%p ptr=%p type=%d name='%s'>",
	     cfunc,
	     cfunc->ptr,
	     cfunc->type,
	     cfunc->name ? cfunc->name : "");
    OBJ_TAINT(val);
    return val;
}