From: cowan@ccil.org (John Cowan)
Subject: [TUHS] Comments on "C"
Date: Wed, 31 Aug 2016 10:37:03 -0400 [thread overview]
Message-ID: <CAD2gp_Rxno3-+Lwk0R8qHNeZ4QUiJC1CSeY3mQKSdVUT_9uPHw@mail.gmail.com> (raw)
In-Reply-To: <01a901d2038c$157e4ff0$407aefd0$@ronnatalie.com>
On Wed, Aug 31, 2016 at 9:32 AM, Ron Natalie <ron at ronnatalie.com> wrote:
> The null pointer constant does not need a cast on ANY architecture .
Well, it's a matter of what counts as "need". People normally expect
execl("/bin/sh", "sh", "-c", "date", NULL) to work, but it will not on
systems
that define NULL as 0 and have different sizes of integers and pointers
(or, Ghu forbid, null pointers that are not all-bits-0). The man page is
careful to warn against this practice, but it is commonplace anyhow,
and on such architectures, defining NULL as (void *)0 will protect
users against this situation.
--
John Cowan http://www.ccil.org/~cowan cowan at ccil.org
Clear? Huh! Why a four-year-old child could understand this report.
Run out and find me a four-year-old child. I can't make head or tail
out of it. --Rufus T. Firefly on government reports
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next prev parent reply other threads:[~2016-08-31 14:37 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-28 18:21 Dave Horsfall
2016-08-29 0:37 ` Marc Rochkind
2016-08-29 0:42 ` Larry McVoy
2016-08-29 1:54 ` Steve Nickolas
2016-09-08 1:19 ` Blake McBride
2016-08-29 3:16 ` Greg 'groggy' Lehey
2016-08-31 10:02 ` Tim Bradshaw
2016-08-31 12:59 ` John Cowan
2016-08-31 13:32 ` Ron Natalie
2016-08-31 14:37 ` John Cowan [this message]
2016-08-31 13:57 ` Brantley Coile
2016-09-01 9:17 Norman Wilson
2016-09-01 15:11 ` Clem Cole
2016-09-01 21:47 ` Tim Bradshaw
2016-09-02 0:11 ` Mary Ann Horton
2016-09-02 7:10 ` Steve Simon
2016-09-02 10:02 ` Steve Nickolas
2016-09-02 14:13 ` Random832
2016-09-02 21:23 ` Dave Horsfall
2016-09-04 17:03 ` scj
2016-09-05 13:07 ` Ron Natalie
2016-09-04 22:24 ` Nemo
2016-09-08 12:35 Doug McIlroy
2016-09-09 17:07 ` scj
2016-09-08 13:30 Noel Chiappa
2016-09-08 14:22 ` Tony Finch
2016-09-08 19:20 ` Ron Natalie
2016-09-08 22:06 ` Dave Horsfall
2016-09-09 3:02 ` Ronald Natalie
2016-09-09 6:06 ` Diomidis Spinellis
2016-09-09 21:15 ` Mary Ann Horton
2016-09-09 2:43 Doug McIlroy
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