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| From | Ian Collins <ian-news@hotmail.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: Typecasting Pointers on a 64 bit System |
| Date | 2011-11-11 11:22 +1300 |
| Message-ID | <9i314pF5h8U10@mid.individual.net> (permalink) |
| References | <j9hbnp$13g$1@speranza.aioe.org> |
On 11/11/11 09:21 AM, Quentin Pope wrote: > What is the best way to handle this warning: > > warning: cast from pointer to integer of different size > > I am casting in and out of a function that requires a pointer type. I > am casting an integer as a pointer, but the pointer is 8 bytes while > the integer is only 4 bytes. > > Here's an example function: > > pthread_create(&tid, NULL, readit, (void *)(long)connfd) > > I need to pass the file descriptor as a void * for pthread_create. But > I need the file descriptor as an integer to read and write to it. Is the > above the best approach to turn off the warning? No. just pass the address of the descriptor. > I am considering just > typecasting to size_t before typecasting to the pointer. Is that a > better approach than typecasting to long since size_t should remain equal > to the size of pointers? Pointers aren't actors. > Of course, I run into the reverse problem when I have to close the > file descriptor. > > close((int) arg); > > I don't even know what to do in the above case. I shouldn't be > truncating anything, so I should be okay. > > I originally wrote the code using a 32 bit version, so I am receiving > these errors when I ported it over to a 64 bit version. Hacks invariably come back and bite you in the arse! -- Ian Collins
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Typecasting Pointers on a 64 bit System Quentin Pope <qp19433@hotmail.NOSPAM.com> - 2011-11-10 20:21 +0000
Re: Typecasting Pointers on a 64 bit System Lauri Alanko <la@iki.fi> - 2011-11-10 20:29 +0000
Re: Typecasting Pointers on a 64 bit System Kaz Kylheku <kaz@kylheku.com> - 2011-11-10 20:51 +0000
Re: Typecasting Pointers on a 64 bit System Kaz Kylheku <kaz@kylheku.com> - 2011-11-10 20:58 +0000
Re: Typecasting Pointers on a 64 bit System James Kuyper <jameskuyper@verizon.net> - 2011-11-10 16:08 -0500
Re: Typecasting Pointers on a 64 bit System Kaz Kylheku <kaz@kylheku.com> - 2011-11-10 21:35 +0000
Re: Typecasting Pointers on a 64 bit System James Kuyper <jameskuyper@verizon.net> - 2011-11-10 17:18 -0500
Re: Typecasting Pointers on a 64 bit System Kaz Kylheku <kaz@kylheku.com> - 2011-11-10 23:14 +0000
Re: Typecasting Pointers on a 64 bit System Richard Damon <news.x.richarddamon@xoxy.net> - 2011-11-10 19:36 -0500
Re: Typecasting Pointers on a 64 bit System Ben Pfaff <blp@cs.stanford.edu> - 2011-11-10 12:32 -0800
Re: Typecasting Pointers on a 64 bit System James Kuyper <jameskuyper@verizon.net> - 2011-11-10 15:44 -0500
Re: Typecasting Pointers on a 64 bit System Keith Thompson <kst-u@mib.org> - 2011-11-10 12:58 -0800
Re: Typecasting Pointers on a 64 bit System blmblm@myrealbox.com <blmblm.myrealbox@gmail.com> - 2011-11-17 15:53 +0000
Re: Typecasting Pointers on a 64 bit System Kaz Kylheku <kaz@kylheku.com> - 2011-11-10 20:45 +0000
Re: Typecasting Pointers on a 64 bit System Kaz Kylheku <kaz@kylheku.com> - 2011-11-10 21:00 +0000
Re: Typecasting Pointers on a 64 bit System Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-11-10 15:14 -0700
Re: Typecasting Pointers on a 64 bit System Ian Collins <ian-news@hotmail.com> - 2011-11-11 11:22 +1300
Re: Typecasting Pointers on a 64 bit System William Ahern <william@wilbur.25thandClement.com> - 2011-11-14 11:10 -0800
Re: Typecasting Pointers on a 64 bit System Ian Collins <ian-news@hotmail.com> - 2011-11-15 08:28 +1300
Re: Typecasting Pointers on a 64 bit System James Kuyper <jameskuyper@verizon.net> - 2011-11-14 14:48 -0500
Re: Typecasting Pointers on a 64 bit System Ian Collins <ian-news@hotmail.com> - 2011-11-15 10:15 +1300
Re: Typecasting Pointers on a 64 bit System jacob navia <jacob@spamsink.net> - 2011-11-14 22:18 +0100
Re: Typecasting Pointers on a 64 bit System Ian Collins <ian-news@hotmail.com> - 2011-11-15 10:26 +1300
Re: Typecasting Pointers on a 64 bit System James Kuyper <jameskuyper@verizon.net> - 2011-11-14 16:46 -0500
Re: Typecasting Pointers on a 64 bit System Ian Collins <ian-news@hotmail.com> - 2011-11-15 10:58 +1300
Re: Typecasting Pointers on a 64 bit System James Kuyper <jameskuyper@verizon.net> - 2011-11-14 17:15 -0500
Re: Typecasting Pointers on a 64 bit System blp@cs.stanford.edu (Ben Pfaff) - 2011-11-14 14:18 -0800
Re: Typecasting Pointers on a 64 bit System Ian Collins <ian-news@hotmail.com> - 2011-11-15 11:29 +1300
Re: Typecasting Pointers on a 64 bit System James Kuyper <jameskuyper@verizon.net> - 2011-11-14 18:14 -0500
Re: Typecasting Pointers on a 64 bit System Seebs <usenet-nospam@seebs.net> - 2011-11-14 23:01 +0000
Re: Typecasting Pointers on a 64 bit System Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-11-16 10:39 +0200
Re: Typecasting Pointers on a 64 bit System Seebs <usenet-nospam@seebs.net> - 2011-11-16 20:18 +0000
Re: Typecasting Pointers on a 64 bit System Fritz Wuehler <fritz@spamexpire-201111.rodent.frell.theremailer.net> - 2011-11-17 02:54 +0100
Re: Typecasting Pointers on a 64 bit System pete <pfiland@mindspring.com> - 2011-11-16 21:29 -0500
Re: Typecasting Pointers on a 64 bit System Seebs <usenet-nospam@seebs.net> - 2011-11-17 02:31 +0000
Re: Typecasting Pointers on a 64 bit System Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-11-18 14:31 +0200
Re: Typecasting Pointers on a 64 bit System Kaz Kylheku <kaz@kylheku.com> - 2011-11-17 02:44 +0000
Re: Typecasting Pointers on a 64 bit System Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-11-16 21:33 -0700
Re: Typecasting Pointers on a 64 bit System "io_x" <a@b.c.invalid> - 2011-11-17 04:01 +0100
Re: Typecasting Pointers on a 64 bit System blmblm@myrealbox.com <blmblm.myrealbox@gmail.com> - 2011-11-17 15:46 +0000
Re: Typecasting Pointers on a 64 bit System Seebs <usenet-nospam@seebs.net> - 2011-11-17 18:48 +0000
Re: Typecasting Pointers on a 64 bit System blmblm@myrealbox.com <blmblm.myrealbox@gmail.com> - 2011-11-18 14:48 +0000
Re: Typecasting Pointers on a 64 bit System Ian Collins <ian-news@hotmail.com> - 2011-11-15 14:37 +1300
Re: Typecasting Pointers on a 64 bit System Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-11-16 10:23 +0200
Re: Typecasting Pointers on a 64 bit System James Kuyper <jameskuyper@verizon.net> - 2011-11-16 06:53 -0500
Re: Typecasting Pointers on a 64 bit System James Kuyper <jameskuyper@verizon.net> - 2011-11-16 11:15 -0500
Re: Typecasting Pointers on a 64 bit System Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-11-16 17:08 +0000
Re: Typecasting Pointers on a 64 bit System Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-11-18 15:09 +0200
Re: Typecasting Pointers on a 64 bit System Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-11-18 14:24 +0200
Re: Typecasting Pointers on a 64 bit System James Kuyper <jameskuyper@verizon.net> - 2011-11-18 10:08 -0500
Re: Typecasting Pointers on a 64 bit System Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2011-11-18 17:52 +0200
Re: Typecasting Pointers on a 64 bit System Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2011-11-14 15:45 -0700
Re: Typecasting Pointers on a 64 bit System "christian.bau" <christian.bau@cbau.wanadoo.co.uk> - 2011-11-10 15:19 -0800
Re: Typecasting Pointers on a 64 bit System Kaz Kylheku <kaz@kylheku.com> - 2011-11-10 23:41 +0000
Re: Typecasting Pointers on a 64 bit System Keith Thompson <kst-u@mib.org> - 2011-11-10 20:48 -0800
Re: Typecasting Pointers on a 64 bit System "christian.bau" <christian.bau@cbau.wanadoo.co.uk> - 2011-11-14 03:39 -0800
Re: Typecasting Pointers on a 64 bit System Lauri Alanko <la@iki.fi> - 2011-11-14 13:08 +0000
Re: Typecasting Pointers on a 64 bit System James Kuyper <jameskuyper@verizon.net> - 2011-11-14 09:21 -0500
Re: Typecasting Pointers on a 64 bit System Keith Thompson <kst-u@mib.org> - 2011-11-14 12:54 -0800
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