Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.c > #22717

Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc

Show all headers | View raw

On 06/25/2012 04:14 PM, Myth__Buster wrote:
...
> In my question being discussed, we are allocating space for a
> function pointer which might *not* be of same size as that of a data
> pointer on some machines. No questions on the allocation. It's fine
> and clear to me. But, the data pointer(void*) being returned by
> malloc will be improper to access the allocated space for the
> function pointer. ...

The function pointer itself has an object type, and you've instructed
malloc() to allocate enough memory to hold it for you. The data pointer
returned by malloc() will be perfectly usable for accessing the memory
you've allocated for the function pointer. Why do you think otherwise?

...
> ... regarding the usage, that
> will be another story. I am interested in getting a proper pointer in
> the first place from malloc ...

Don't worry about getting a proper pointer in the first place from
malloc() - if what you're trying to do makes any sense, and if it makes
sense to use malloc() as part of the solution to your problem, then I
guarantee you that the pointer returned by malloc() will be proper.
Telling us what you want to do with this pointer after you've allocated
might help us figure out why you think otherwise.

Back to comp.lang.c | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc Myth__Buster <raghavanil4m@gmail.com> - 2012-06-25 09:08 -0700
  Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc "christian.bau" <christian.bau@cbau.wanadoo.co.uk> - 2012-06-25 09:16 -0700
    Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc Myth__Buster <raghavanil4m@gmail.com> - 2012-06-25 12:08 -0700
      Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc James Kuyper <jameskuyper@verizon.net> - 2012-06-25 15:27 -0400
      Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-06-25 15:30 -0400
        Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc Myth__Buster <raghavanil4m@gmail.com> - 2012-06-25 12:47 -0700
          Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-06-25 16:10 -0400
      Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-06-25 20:42 +0100
        Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc Myth__Buster <raghavanil4m@gmail.com> - 2012-06-25 13:14 -0700
          Re: Different sizes of data and function pointers on a machine --   void* return type of malloc, calloc, and realloc Ian Collins <ian-news@hotmail.com> - 2012-06-26 08:30 +1200
            Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc Myth__Buster <raghavanil4m@gmail.com> - 2012-06-25 13:53 -0700
              Re: Different sizes of data and function pointers on a machine --   void* return type of malloc, calloc, and realloc Ian Collins <ian-news@hotmail.com> - 2012-06-26 09:00 +1200
              Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc James Kuyper <jameskuyper@verizon.net> - 2012-06-25 17:13 -0400
              Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc Myth__Buster <raghavanil4m@gmail.com> - 2012-06-25 13:58 -0700
                Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc Owen Jacobson <angrybaldguy@gmail.com> - 2012-06-26 00:03 -0400
          Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc James Kuyper <jameskuyper@verizon.net> - 2012-06-25 16:47 -0400
          Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc gordonb.vk4xa@burditt.org (Gordon Burditt) - 2012-06-25 16:06 -0500
          Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc Keith Thompson <kst-u@mib.org> - 2012-06-25 14:17 -0700
          Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-06-25 17:24 -0400
  Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc James Kuyper <jameskuyper@verizon.net> - 2012-06-25 12:52 -0400
    Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc Myth__Buster <raghavanil4m@gmail.com> - 2012-06-25 12:28 -0700
      Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc James Kuyper <jameskuyper@verizon.net> - 2012-06-25 15:59 -0400
      Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc Keith Thompson <kst-u@mib.org> - 2012-06-25 14:08 -0700
      Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc Nobody <nobody@nowhere.com> - 2012-06-26 21:29 +0100
  Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc Keith Thompson <kst-u@mib.org> - 2012-06-25 13:13 -0700
  Re: Different sizes of data and function pointers on a machine -- void* return type of malloc, calloc, and realloc Paul N <gw7rib@aol.com> - 2012-06-25 13:17 -0700

csiph-web