In Files
- fiddle/closure.c
- fiddle/fiddle.c
- fiddle/lib/fiddle.rb
- fiddle/lib/fiddle/closure.rb
- fiddle/lib/fiddle/cparser.rb
- fiddle/lib/fiddle/function.rb
- fiddle/lib/fiddle/import.rb
- fiddle/lib/fiddle/pack.rb
- fiddle/lib/fiddle/struct.rb
- fiddle/lib/fiddle/types.rb
- fiddle/lib/fiddle/value.rb
Namespace
- MODULE Fiddle::BasicTypes
- MODULE Fiddle::CParser
- MODULE Fiddle::CStructBuilder
- MODULE Fiddle::Importer
- MODULE Fiddle::Win32Types
- CLASS Fiddle::CStruct
- CLASS Fiddle::CStructEntity
- CLASS Fiddle::CUnion
- CLASS Fiddle::CUnionEntity
- CLASS Fiddle::Closure
- CLASS Fiddle::CompositeHandler
- CLASS Fiddle::DLError
- CLASS Fiddle::Function
- CLASS Fiddle::Handle
- CLASS Fiddle::Pointer
Class/Module Index
![[+]](./images/find.png "show/hide quicksearch")
- Fiddle
- Fiddle::BasicTypes
- Fiddle::CParser
- Fiddle::CStruct
- Fiddle::CStructBuilder
- Fiddle::CStructEntity
- Fiddle::CUnion
- Fiddle::CUnionEntity
- Fiddle::Closure
- Fiddle::Closure::BlockCaller
- Fiddle::CompositeHandler
- Fiddle::DLError
- Fiddle::Function
- Fiddle::Handle
- Fiddle::Importer
- Fiddle::Pointer
- Fiddle::Win32Types
- Win32
- Win32::Registry
- Win32::Registry::API
- Win32::Registry::Constants
- Win32::Registry::Error
- Win32::Registry::Error::Kernel32
- Win32::Registry::PredefinedKey
- Win32::Resolv
- Win32::Resolv::Kernel32
Fiddle
A libffi wrapper for Ruby.
Description¶ ↑
Fiddle is an extension to translate a foreign function interface (FFI) with ruby.
It wraps libffi, a popular C library which provides a portable interface that allows code written in one language to clal code written in another language.
Example¶ ↑
Here we will use Fiddle::Function to wrap floor(3) from libm
require 'fiddle' libm = Fiddle.dlopen('/lib/libm.so.6') floor = Fiddle::Function.new( libm['floor'], [Fiddle::TYPE_DOUBLE], Fiddle::TYPE_DOUBLE ) puts floor.call(3.14159) #=> 3.0
Constants
- ALIGN_CHAR
-
The alignment size of a char
- ALIGN_DOUBLE
-
The alignment size of a double
- ALIGN_FLOAT
-
The alignment size of a float
- ALIGN_INT
-
The alignment size of an int
- ALIGN_INTPTR_T
-
The alignment size of a intptr_t
- ALIGN_LONG
-
The alignment size of a long
- ALIGN_LONG_LONG
-
The alignment size of a long long
- ALIGN_PTRDIFF_T
-
The alignment size of a ptrdiff_t
- ALIGN_SHORT
-
The alignment size of a short
- ALIGN_SIZE_T
-
The alignment size of a size_t
- ALIGN_SSIZE_T
-
The alignment size of a ssize_t
- ALIGN_UINTPTR_T
-
The alignment size of a uintptr_t
- ALIGN_VOIDP
-
The alignment size of a void*
- BUILD_RUBY_PLATFORM
-
Platform built against (i.e. “x86_64-linux”, etc.)
See also RUBY_PLATFORM
- RUBY_FREE
-
Address of the ruby_xfree() function
- SIZEOF_CHAR
-
size of a char
- SIZEOF_DOUBLE
-
size of a double
- SIZEOF_FLOAT
-
size of a float
- SIZEOF_INT
-
size of an int
- SIZEOF_INTPTR_T
-
size of a intptr_t
- SIZEOF_LONG
-
size of a long
- SIZEOF_LONG_LONG
-
size of a long long
- SIZEOF_PTRDIFF_T
-
size of a ptrdiff_t
- SIZEOF_SHORT
-
size of a short
- SIZEOF_SIZE_T
-
size of a size_t
- SIZEOF_SSIZE_T
-
size of a ssize_t
- SIZEOF_UINTPTR_T
-
size of a uintptr_t
- SIZEOF_VOIDP
-
size of a void*
- TYPE_CHAR
-
C type - char
- TYPE_DOUBLE
-
C type - double
- TYPE_FLOAT
-
C type - float
- TYPE_INT
-
C type - int
- TYPE_INTPTR_T
-
C type - intptr_t
- TYPE_LONG
-
C type - long
- TYPE_LONG_LONG
-
C type - long long
- TYPE_PTRDIFF_T
-
C type - ptrdiff_t
- TYPE_SHORT
-
C type - short
- TYPE_SIZE_T
-
C type - size_t
- TYPE_SSIZE_T
-
C type - ssize_t
- TYPE_UINTPTR_T
-
C type - uintptr_t
- TYPE_VOID
-
C type - void
- TYPE_VOIDP
-
C type - void*
- WINDOWS
Returns a boolean regarding whether the host is WIN32
Public Class Methods
Creates a new handler that opens library, and returns an
instance of Fiddle::Handle.
See Fiddle::Handle.new for more.
# File fiddle/lib/fiddle.rb, line 36
def dlopen library
Fiddle::Handle.new library
end
Returns the hexadecimal representation of a memory pointer address
addr
Example:
lib = Fiddle.dlopen('/lib64/libc-2.15.so')
=> #<Fiddle::Handle:0x00000001342460>
lib['strcpy'].to_s(16)
=> "7f59de6dd240"
Fiddle.dlunwrap(Fiddle.dlwrap(lib['strcpy'].to_s(16)))
=> "7f59de6dd240"
VALUE
rb_fiddle_ptr2value(VALUE self, VALUE addr)
{
rb_secure(4);
return (VALUE)NUM2PTR(addr);
}
Returns a memory pointer of a function's hexadecimal address location
val
Example:
lib = Fiddle.dlopen('/lib64/libc-2.15.so')
=> #<Fiddle::Handle:0x00000001342460>
Fiddle.dlwrap(lib['strcpy'].to_s(16))
=> 25522520
static VALUE
rb_fiddle_value2ptr(VALUE self, VALUE val)
{
return PTR2NUM((void*)val);
}
Free the memory at address addr
VALUE
rb_fiddle_free(VALUE self, VALUE addr)
{
void *ptr = NUM2PTR(addr);
rb_secure(4);
ruby_xfree(ptr);
return Qnil;
}
Returns the last Error of the current executing
Thread or nil if none
# File fiddle/lib/fiddle.rb, line 20
def self.last_error
Thread.current[:__FIDDLE_LAST_ERROR__]
end
Sets the last Error of the current executing
Thread to error
# File fiddle/lib/fiddle.rb, line 25
def self.last_error= error
Thread.current[:__DL2_LAST_ERROR__] = error
Thread.current[:__FIDDLE_LAST_ERROR__] = error
end
Allocate size bytes of memory and return the integer memory
address for the allocated memory.
static VALUE
rb_fiddle_malloc(VALUE self, VALUE size)
{
void *ptr;
rb_secure(4);
ptr = (void*)ruby_xmalloc(NUM2INT(size));
return PTR2NUM(ptr);
}
Change the size of the memory allocated at the memory location
addr to size bytes. Returns the memory address
of the reallocated memory, which may be different than the address passed
in.
static VALUE
rb_fiddle_realloc(VALUE self, VALUE addr, VALUE size)
{
void *ptr = NUM2PTR(addr);
rb_secure(4);
ptr = (void*)ruby_xrealloc(ptr, NUM2INT(size));
return PTR2NUM(ptr);
}