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.



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# 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_errorObject

Returns the last error for the current executing thread



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# 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_errorObject

Returns the last win32 error for the current executing thread



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# 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.



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# 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.



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# 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;
}

#calltypeObject

Get the call type of this function.



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# 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.



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# 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;
}

#ctypeNumeric

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

Returns:

  • (Numeric)


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# 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.



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# 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;
}

#inspectObject #to_sObject

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



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# 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;
}

#nameString

Get the name of this function

Returns:

  • (String)


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# 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;
}

#ptrObject

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



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# 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.



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# 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_iInteger

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

Returns:

  • (Integer)


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# 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);
}

#inspectObject #to_sObject

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



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# 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;
}