Re: srand(0)

From	Michael S <already5chosen@yahoo.com>
Newsgroups	comp.lang.c
Subject	Re: srand(0)
Date	2026-01-01 01:45 +0200
Organization	A noiseless patient Spider
Message-ID	<20260101014548.000012eb@yahoo.com> (permalink)
References	(12 earlier) <q2V4R.913844$ACS3.500160@fx17.iad> <10j206j$27s3j$1@dont-email.me> <87jyy3wcgf.fsf@example.invalid> <20251231151502.00002c3e@yahoo.com> <877bu2w92v.fsf@example.invalid>

Show all headers | View raw

On Wed, 31 Dec 2025 15:00:24 -0800
Keith Thompson <Keith.S.Thompson+u@gmail.com> wrote:

> Michael S <already5chosen@yahoo.com> writes:
> > On Tue, 30 Dec 2025 19:35:12 -0800
> > Keith Thompson <Keith.S.Thompson+u@gmail.com> wrote:  
> [...]
> >> For more information, see
> >> <https://github.com/Keith-S-Thompson/argv0>.  
> >
> > If you are interested in behavior on non-POSIX systems, primarily
> > Windows, but possibly others as well (e.g. VMS) then using exec()
> > in caller sounds like a bad idea. It just not how these systems
> > work and not how people write programs on them.
> > Even when exec() *appears* to works in some environments (like
> > msys2) it likely emulated by spawn() followed by exit().
> >
> > I'd implement caller with spawn(). I suppose that even on POSIX it
> > is more idiomatic.  
> 
> If I were going to look into the behavior on Windows, I'd probably
> want to use Windows native features.  (I tried my test on Cygwin,
> and the callee wasn't invoked.)
> 

That's likely because under Windows callee is named callee.exe.
I didn't try on cygwin, but that was the reason of failure under msys2.
Also, I am not sure if slash in the name is allowed. May be, backslash
is required.

> Apparently the Windows way to invoke a program is CreateProcessA().
> But it takes the command line as a single string.  There might not
> be a Windows-native way to exercise the kind of control over argc
> and argv provided by POSIX execve().
> 

Yes, some tricky combinations easily possible under POSIX are hard to
achieve under Windows. The result could depend on exact implementation
of parsing of command line in C start up code. May be, some combinations
are even impossible, although right now I can not think out an
example.

But that was not my point. My point was that analog of exec() family
does not exist in Windows (or VMS). Even if it appears to exist that
just means that your environment somehow fooling you. The PID of child
is not the same as parent's.
So, if you want cross-platform test, it makes more sense to use spawn()
family. It does not look like your test will be any more complicated
with spawn() and as a free benefit you can print some info of
interest in the parent process after after spawn() call.

However I was wrong in my suggestion. I didn't realize that spawn
functions under Windows and their POSIX equivalents have different names
and different order of arguments. 
So, I take my suggestion back.

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

Thread

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

csiph-web