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| From | Keith Thompson <Keith.S.Thompson+u@gmail.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: srand(0) |
| Date | 2026-01-08 22:46 -0800 |
| Organization | None to speak of |
| Message-ID | <87tswvnuzx.fsf@example.invalid> (permalink) |
| References | (2 earlier) <867bttph43.fsf@linuxsc.com> <87ikddgkc2.fsf@example.invalid> <10joipc$1jc43$1@dont-email.me> <87344fhghg.fsf@example.invalid> <10jq5u1$23nps$1@dont-email.me> |
Michael Sanders <porkchop@invalid.foo> writes:
> On Thu, 08 Jan 2026 14:44:27 -0800, Keith Thompson wrote:
>> Michael Sanders <porkchop@invalid.foo> writes:
[...]
>>> So then clang would use:
>>>
>>> #ifdef __OpenBSD__
>>> srand_deterministic(seed);
>>> #else
>>> srand(seed);
>>> #endif
>>>
>>> But I don't know (yet) that gcc does as well under OpenBSD.
>>
>> I don't know what you mean when you say that clang "would use"
>> that code.
>>
>> I'm not aware that either clang or gcc uses random numbers
>> internally. I don't know why they would.
>
> Well, I meant the macro itself is (I'm guessing) probably defined
> by clang since its the default compiler.
You mean the macro __OpenBSD__? Yes, that and other similar macros
are predefined by the compiler, which is configured for each OS.
gcc on OpenBSD also predefines it. (I don't know whether it's
predefined by the preprocessor directly or by some header that's
included implicitly. That doesn't really matter.) Compilers on
other platforms will not predefine __OpenBSD__.
But your original statement implied that clang would *use* that
particular piece of code, which didn't make much sense. Were you
just asking about how the __OpenBSD__ macro is defined, without
reference to srand?
[...]
--
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
void Void(void) { Void(); } /* The recursive call of the void */
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srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-22 08:48 +0000
Re: srand(0) James Kuyper <jameskuyper@alumni.caltech.edu> - 2025-12-22 06:44 -0500
Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-22 13:18 +0100
Re: srand(0) James Kuyper <jameskuyper@alumni.caltech.edu> - 2025-12-22 12:13 -0500
Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-22 18:41 +0100
Re: srand(0) Michael S <already5chosen@yahoo.com> - 2025-12-22 20:45 +0200
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-22 21:16 +0000
Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-22 22:19 +0100
Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-22 22:57 +0100
Re: srand(0) Michael S <already5chosen@yahoo.com> - 2025-12-23 11:18 +0200
Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-23 10:54 +0100
Re: srand(0) Michael S <already5chosen@yahoo.com> - 2025-12-23 13:50 +0200
Re: srand(0) James Kuyper <jameskuyper@alumni.caltech.edu> - 2025-12-23 18:29 -0500
Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-23 16:30 -0800
Re: srand(0) antispam@fricas.org (Waldek Hebisch) - 2025-12-23 17:54 +0000
Re: srand(0) Michael S <already5chosen@yahoo.com> - 2025-12-24 00:08 +0200
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-24 02:02 +0000
Re: srand(0) James Kuyper <jameskuyper@alumni.caltech.edu> - 2025-12-23 23:43 -0500
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-24 05:34 +0000
Re: srand(0) antispam@fricas.org (Waldek Hebisch) - 2025-12-24 09:00 +0000
Re: srand(0) Michael S <already5chosen@yahoo.com> - 2025-12-24 12:12 +0200
Article of Melissa O'Nail (Was: srand(0)) Michael S <already5chosen@yahoo.com> - 2025-12-28 02:44 +0200
Re: Article of Melissa O'Nail antispam@fricas.org (Waldek Hebisch) - 2025-12-28 05:38 +0000
Re: Article of Melissa O'Nail Michael S <already5chosen@yahoo.com> - 2025-12-28 12:35 +0200
Re: Article of Melissa O'Nail Michael S <already5chosen@yahoo.com> - 2026-01-05 14:21 +0200
Re: Article of Melissa O'Nail antispam@fricas.org (Waldek Hebisch) - 2026-01-07 10:51 +0000
Re: Article of Melissa O'Nail Michael S <already5chosen@yahoo.com> - 2026-01-08 14:03 +0200
Re: Article of Melissa O'Nail Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-01-08 09:40 -0800
Re: srand(0) Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-01-08 09:26 -0800
Re: srand(0) "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-12-24 13:48 -0800
Re: srand(0) Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-01-07 08:41 -0800
Re: srand(0) Michael S <already5chosen@yahoo.com> - 2026-01-08 01:06 +0200
Re: srand(0) Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-02-03 05:26 -0800
Re: srand(0) Michael S <already5chosen@yahoo.com> - 2026-02-03 16:37 +0200
Re: srand(0) Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-02-17 23:47 -0800
Re: srand(0) Tristan Wibberley <tristan.wibberley+netnews2@alumni.manchester.ac.uk> - 2026-02-18 11:21 +0000
Re: srand(0) David Brown <david.brown@hesbynett.no> - 2026-02-19 10:01 +0100
Re: srand(0) James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-02-19 14:33 -0500
Re: srand(0) David Brown <david.brown@hesbynett.no> - 2026-02-19 20:47 +0100
Re: srand(0) James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-02-20 16:01 -0500
Re: srand(0) David Brown <david.brown@hesbynett.no> - 2026-02-21 11:09 +0100
Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-02-19 14:39 -0800
Re: srand(0) David Brown <david.brown@hesbynett.no> - 2026-02-20 09:16 +0100
Re: srand(0) Paul <nospam@needed.invalid> - 2026-02-23 08:32 -0500
Re: srand(0) David Brown <david.brown@hesbynett.no> - 2026-02-23 16:05 +0100
Re: srand(0) Michael S <already5chosen@yahoo.com> - 2026-02-23 19:59 +0200
Re: srand(0) David Brown <david.brown@hesbynett.no> - 2026-02-23 20:06 +0100
Re: srand(0) Paul <nospam@needed.invalid> - 2026-02-23 15:24 -0500
Re: srand(0) Axel Reichert <mail@axel-reichert.de> - 2026-02-24 07:08 +0100
Re: srand(0) David Brown <david.brown@hesbynett.no> - 2026-02-24 10:24 +0100
Re: srand(0) Axel Reichert <mail@axel-reichert.de> - 2026-02-26 19:13 +0100
Re: srand(0) BGB <cr88192@gmail.com> - 2025-12-24 05:22 -0600
Re: srand(0) BGB <cr88192@gmail.com> - 2025-12-24 23:09 -0600
Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-25 09:51 +0100
Re: srand(0) BGB <cr88192@gmail.com> - 2025-12-25 04:24 -0600
Re: srand(0) Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-01-07 07:50 -0800
Re: srand(0) Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-01-07 07:46 -0800
Re: srand(0) Michael S <already5chosen@yahoo.com> - 2026-01-07 18:14 +0200
Re: srand(0) Kaz Kylheku <046-301-5902@kylheku.com> - 2025-12-22 19:16 +0000
Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-22 22:35 +0100
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-23 07:24 +0000
Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-23 09:59 +0100
Re: srand(0) Michael Bäuerle <michael.baeuerle@stz-e.de> - 2025-12-23 11:09 +0100
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-23 14:49 +0000
Re: srand(0) scott@slp53.sl.home (Scott Lurndal) - 2025-12-23 16:13 +0000
Re: srand(0) richard@cogsci.ed.ac.uk (Richard Tobin) - 2025-12-23 19:05 +0000
Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-23 02:16 -0800
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-23 14:47 +0000
Re: srand(0) scott@slp53.sl.home (Scott Lurndal) - 2025-12-23 16:08 +0000
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-24 15:44 +0000
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-23 07:17 +0000
Re: srand(0) David Brown <david.brown@hesbynett.no> - 2025-12-23 08:25 +0100
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-23 14:45 +0000
Re: srand(0) David Brown <david.brown@hesbynett.no> - 2025-12-23 19:15 +0100
Re: srand(0) John McCue <jmclnx@gmail.com.invalid> - 2025-12-23 00:39 +0000
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-23 02:17 +0000
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-23 14:55 +0000
Re: srand(0) BGB <cr88192@gmail.com> - 2025-12-24 23:35 -0600
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-26 08:23 +0000
Re: srand(0) BGB <cr88192@gmail.com> - 2025-12-26 14:48 -0600
Re: srand(0) BGB <cr88192@gmail.com> - 2025-12-26 15:12 -0600
Re: srand(0) Ike Naar <ike@sdf.org> - 2025-12-23 06:49 +0000
Re: srand(0) John McCue <jmclnx@gmail.com.invalid> - 2025-12-23 20:37 +0000
Re: srand(0) Ike Naar <ike@sdf.org> - 2025-12-24 15:22 +0000
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-23 07:25 +0000
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-24 06:16 +0000
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-24 15:21 +0000
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-24 19:00 +0000
Re: srand(0) BGB <cr88192@gmail.com> - 2025-12-25 03:07 -0600
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-25 19:31 +0000
Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-25 21:14 +0100
Re: srand(0) BGB <cr88192@gmail.com> - 2025-12-25 15:29 -0600
Re: srand(0) Paul <nospam@needed.invalid> - 2025-12-25 23:25 -0500
Re: srand(0) BGB <cr88192@gmail.com> - 2025-12-25 23:41 -0600
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-26 05:42 +0000
Re: srand(0) Paul <nospam@needed.invalid> - 2025-12-26 01:52 -0500
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-26 07:56 +0000
Re: srand(0) BGB <cr88192@gmail.com> - 2025-12-26 04:48 -0600
Re: srand(0) Michael S <already5chosen@yahoo.com> - 2025-12-24 10:51 +0200
Re: srand(0) "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-12-24 00:59 -0800
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-24 15:28 +0000
Re: srand(0) Michael S <already5chosen@yahoo.com> - 2025-12-24 17:44 +0200
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-24 16:17 +0000
Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-24 17:53 +0100
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-24 17:27 +0000
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-24 17:33 +0000
Re: srand(0) Michael S <already5chosen@yahoo.com> - 2025-12-24 20:16 +0200
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-25 02:01 +0000
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-25 03:17 +0000
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-26 08:13 +0000
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-25 04:30 +0000
Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-25 09:10 +0100
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-26 08:08 +0000
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-30 06:07 +0000
Re: srand(0) scott@slp53.sl.home (Scott Lurndal) - 2025-12-30 18:42 +0000
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-31 02:01 +0000
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-31 03:10 +0000
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-31 03:28 +0000
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-31 09:37 +0000
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2026-01-01 07:32 +0000
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-01 19:02 +0000
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2026-01-01 19:20 +0000
Re: srand(0) Michael S <already5chosen@yahoo.com> - 2026-01-01 21:53 +0200
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-01 23:50 +0000
Re: srand(0) Michael S <already5chosen@yahoo.com> - 2026-01-02 14:32 +0200
Re: srand(0) Michael S <already5chosen@yahoo.com> - 2026-01-02 16:18 +0200
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-02 20:52 +0000
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-02 20:46 +0000
Re: srand(0) Mike Terry <news.dead.person.stones@darjeeling.plus.com> - 2026-01-03 04:08 +0000
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-03 04:39 +0000
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2026-01-03 14:24 +0000
Re: srand(0) Michael S <already5chosen@yahoo.com> - 2026-01-03 20:38 +0200
Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-30 19:37 -0800
Re: srand(0) scott@slp53.sl.home (Scott Lurndal) - 2025-12-31 17:24 +0000
Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-31 15:17 -0800
Re: srand(0) Paul <nospam@needed.invalid> - 2025-12-31 12:30 -0500
Re: srand(0) bart <bc@freeuk.com> - 2025-12-31 18:42 +0000
Re: srand(0) Paul <nospam@needed.invalid> - 2025-12-31 15:07 -0500
Re: srand(0) Michael S <already5chosen@yahoo.com> - 2025-12-31 22:18 +0200
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-31 20:55 +0000
Re: srand(0) bart <bc@freeuk.com> - 2025-12-31 22:57 +0000
Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-31 16:00 -0800
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-01 01:03 +0000
Re: srand(0) bart <bc@freeuk.com> - 2026-01-01 14:05 +0000
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-01 19:03 +0000
Re: srand(0) bart <bc@freeuk.com> - 2026-01-01 20:28 +0000
Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-31 15:29 -0800
Re: srand(0) highcrew <high.crew3868@fastmail.com> - 2026-01-01 00:31 +0100
Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-31 16:05 -0800
Re: srand(0) Michael S <already5chosen@yahoo.com> - 2025-12-31 15:29 +0200
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-31 20:52 +0000
Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-31 15:14 -0800
Re: srand(0) Geoff <geoff@invalid.invalid> - 2026-01-05 20:00 -0800
Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-31 15:03 -0800
Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-30 19:35 -0800
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-31 04:51 +0000
Re: srand(0) Michael S <already5chosen@yahoo.com> - 2025-12-31 15:15 +0200
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-31 20:51 +0000
Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-31 15:00 -0800
Re: srand(0) Michael S <already5chosen@yahoo.com> - 2026-01-01 01:45 +0200
Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-31 16:34 -0800
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2026-01-01 07:23 +0000
Re: srand(0) Mike Terry <news.dead.person.stones@darjeeling.plus.com> - 2026-01-01 02:01 +0000
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-01 02:29 +0000
Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-30 06:34 +0000
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-30 14:05 +0000
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-28 05:51 +0000
Re: srand(0) scott@slp53.sl.home (Scott Lurndal) - 2025-12-24 17:08 +0000
Re: srand(0) Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-01-07 07:39 -0800
Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-01-07 13:54 -0800
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2026-01-08 15:34 +0000
Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-01-08 14:44 -0800
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2026-01-09 06:06 +0000
Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-01-08 22:46 -0800
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2026-01-09 22:38 +0000
Re: srand(0) scott@slp53.sl.home (Scott Lurndal) - 2026-01-09 23:27 +0000
Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-01-09 17:09 -0800
Re: srand(0) Kaz Kylheku <046-301-5902@kylheku.com> - 2026-01-10 19:44 +0000
Re: srand(0) Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-01-09 00:36 -0800
Re: srand(0) Bonita Montero <Bonita.Montero@gmail.com> - 2025-12-23 11:04 +0100
Re: srand(0) "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-12-23 21:44 -0800
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-24 15:41 +0000
Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-24 18:04 +0100
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-25 05:41 +0000
Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2026-01-08 02:57 +0000
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