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Re: Getting the saved set uid

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On Thursday, March 24, 2016 at 9:30:07 PM UTC+1, wil...@wilbur.25thandclement.com wrote:
> spud@potato.field wrote:
> > On Wed, 23 Mar 2016 10:01:14 -0700 (PDT)
> > Philip Guenther <guenther@gmail.com> wrote:
> >>On Wednesday, March 23, 2016 at 8:21:55 AM UTC-7, sp...@potato.field wrote:
> >>> Is there a way in C of getting the current saved set user id (as set by
> >>> seteuid()) ?
> >>
> >>Does your system have useful manpages?  If so, "man -k" (also called
> >>"apropos") can be a quick start to these questions:
> > 
> > $ man getresgid
> > No manual entry for getresgid
> > $ man getresuid
> > No manual entry for getresuid
> > 
> > So, hows that sarcasm working out for you?
> > 
> > Turns out those functions are non standard. Supported on Linux and hp-ux
> > but thats about it. Not OS/X as you can see above.
> > 
> > Are there posix functions that do the same? And yes I have googled already
> > otherwise I wouldn't asking.
> 
> You can download the POSIX specification for free from
> 
>         https://www2.opengroup.org/ogsys/catalog/c138
> 
> or just visit it online at
> 
>         http://pubs.opengroup.org/onlinepubs/9699919799/
> 
> The index of system interfaces is incomparably useful. Select "System
> Interfaces" from the top-left frame, then "System Interfaces" in the
> bottom-left frame. That gives you the full list of system interfaces (aka
> syscalls and libc routines), and AFAICT there's nothing like getreuid
> available.
> 
> The history and rationale sections of related interface definitions often
> provide useful information. As do other chapters in the Base Definitions and
> System Interfaces volumes. For example, section 3.331 Saved Set-User-ID
> directs you to the setuid and exec-family definitions for more information,
> and indeed the rationale section of setuid contains much information about
> the semantics of uids.
> 
> If you're serious about C or Unix programming it would be prudent to have
> local copies of the POSIX and C standards.[1] Once you become familiar with
> them I think you'll find them much more convenient and reliable in general
> than either man pages (especially the inconsistent Linux man pages),
> Googling, or technical forums. Only once I know or suspect I'm dealing with
> vendor extensions do I bother with anything else, and by then the standards
> have framed things such that I'm much more productive when searching and
> analyzing other sources.
> 
> 
> [1] The draft C99 and C11 standards are freely available, and but for
> inconsequential typos identical to the published standards. See
> 
>         http://www.open-std.org/jtc1/sc22/wg14/www/standards

According to my manual page, sendto() conforms to POSIX.1-2001. Is this normal?

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Getting the saved set uid spud@potato.field - 2016-03-23 15:21 +0000
  Re: Getting the saved set uid Philip Guenther <guenther@gmail.com> - 2016-03-23 10:01 -0700
    Re: Getting the saved set uid spud@potato.field - 2016-03-24 09:40 +0000
      Re: Getting the saved set uid Philip Guenther <guenther@gmail.com> - 2016-03-24 09:10 -0700
        Re: Getting the saved set uid spud-u-dont-like@potato.field - 2016-03-25 12:50 +0000
          Re: Getting the saved set uid Barry Margolin <barmar@alum.mit.edu> - 2016-03-25 10:28 -0400
          Sarcasm in Usenet posts (Was: Getting the saved set uid) gazelle@shell.xmission.com (Kenny McCormack) - 2016-03-25 14:29 +0000
            Re: Sarcasm in Usenet posts (Was: Getting the saved set uid) Barry Margolin <barmar@alum.mit.edu> - 2016-03-25 11:49 -0400
              Re: Sarcasm in Usenet posts (Was: Getting the saved set uid) Ian Zimmerman <itz@buug.org> - 2016-03-26 09:41 -0700
            Re: Sarcasm in Usenet posts (Was: Getting the saved set uid) Philip Guenther <guenther@gmail.com> - 2016-03-25 10:10 -0700
      Re: Getting the saved set uid <william@wilbur.25thandClement.com> - 2016-03-24 13:16 -0700
        Re: Getting the saved set uid boon <fred900rbc@gmail.com> - 2016-04-01 04:42 -0700
          Re: Getting the saved set uid Noob <root@127.0.0.1> - 2016-04-01 19:16 +0200
            Re: Getting the saved set uid Barry Margolin <barmar@alum.mit.edu> - 2016-04-01 17:23 -0400
              Re: Getting the saved set uid boon <fred900rbc@gmail.com> - 2016-04-01 17:27 -0700
  Re: Getting the saved set uid boon <root@127.10.10.1> - 2016-03-24 12:08 +0100
    Re: Getting the saved set uid spud@potato.field - 2016-03-24 11:59 +0000
      Re: Getting the saved set uid boon <root@127.10.10.1> - 2016-03-24 13:19 +0100

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