From: lyndon@orthanc.ca (Lyndon Nerenberg)
Subject: [TUHS] /bin/true (was basic tools / Universal Unix)
Date: Thu, 19 Oct 2017 18:31:16 -0700 [thread overview]
Message-ID: <FEE2FA3E-A7F8-484D-81F2-CC390B11E12D@orthanc.ca> (raw)
In-Reply-To: <CAEoi9W5Z6WDPtD9TuFz8W7KsSrsrLcrXmhhq4h6P2dG4vOAF7Q@mail.gmail.com>
> On Oct 19, 2017, at 6:27 PM, Dan Cross <crossd at gmail.com> wrote:
>
> macOS requires you to have a data section aligned to 4K, even if you
> don't use it. The resulting binary is a little over 8K; again, mostly
> zeros.
>
> There are parlor tricks people play to get binary sizes down to
> incredibly small values, but I found the results interesting. Building
> the obvious C program on a PDP-11 running 7th Edition yields a 136
> byte executable, stripped. Still infinitely greater than /bin/true in
> the limit, but still svelte by modern standards.
No matter how tiny you can make the a.out, the kernel's still going to have to map in at least one page to hold it, so you're eating a minimum of 4K on any modern machine, regardless.
next prev parent reply other threads:[~2017-10-20 1:31 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-19 14:52 /bin/true (was [TUHS] " Ron Natalie
2017-10-19 15:01 ` Pete Wright
2017-10-19 15:17 ` Chet Ramey
2017-10-19 21:23 ` Steffen Nurpmeso
2017-10-19 21:43 ` Chet Ramey
2017-10-19 23:00 ` [TUHS] /bin/true (was " Dave Horsfall
2017-10-19 23:14 ` Grant Taylor
2017-10-19 23:23 ` Lyndon Nerenberg
2017-10-19 23:27 ` Kurt H Maier
2017-10-22 4:18 ` Dave Horsfall
2017-10-20 12:10 ` Chet Ramey
2017-10-19 21:43 ` /bin/true (was [TUHS] " Dave Horsfall
2017-10-19 22:04 ` Ronald Natalie
2017-10-19 23:25 ` [TUHS] /bin/true (was " Dave Horsfall
[not found] ` <CAEoi9W7YZ7YXUip0JTMGip3Nd0czgdjqRCMRcK2GYmDJsckuDg@mail.gmail.com>
[not found] ` <CAEoi9W4zdJ3+RXjK5-5rAJ6rwx_0kx6N-bn1U61=txJGyLT_mw@mail.gmail.com>
2017-10-20 1:27 ` Dan Cross
2017-10-20 1:31 ` Lyndon Nerenberg [this message]
2017-10-20 2:05 ` Ronald Natalie
2017-11-28 16:21 ` Nemo
2017-11-28 17:56 ` Warner Losh
2017-11-28 18:26 ` Dan Cross
2017-11-28 18:41 ` Warner Losh
2017-11-28 19:09 ` Dan Cross
2017-11-28 20:34 ` Clem Cole
2017-11-28 22:42 ` Ralph Corderoy
2017-11-28 18:34 ` Bakul Shah
2017-11-28 23:25 ` Ralph Corderoy
2017-10-22 23:00 Doug McIlroy
2017-10-23 1:11 ` Dan Cross
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