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The Windows Access Control Model: Part 2

, 27 Jun 2005
This second part of the Access Control series will program with the basic Access Control structures.
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//  (C) Copyright Boost.org 2001. Permission to copy, use, modify, sell and
//  distribute this software is granted provided this copyright notice appears
//  in all copies. This software is provided "as is" without express or implied
//  warranty, and with no claim as to its suitability for any purpose.

//  See http://www.boost.org for most recent version.

// All POSIX feature tests go in this file,
// Note that we test _POSIX_C_SOURCE and _XOPEN_SOURCE as well
// _POSIX_VERSION and _XOPEN_VERSION: on some systems POSIX API's
// may be present but none-functional unless _POSIX_C_SOURCE and
// _XOPEN_SOURCE have been defined to the right value (it's up
// to the user to do this *before* including any header, although
// in most cases the compiler will do this for you).

#  if defined(BOOST_HAS_UNISTD_H)
#     include <unistd.h>

      // XOpen has <nl_types.h>, but is this the correct version check?
#     if defined(_XOPEN_VERSION) && (_XOPEN_VERSION >= 3)
#        define BOOST_HAS_NL_TYPES_H
#     endif

      // POSIX version 6 requires <stdint.h>
#     if defined(_POSIX_VERSION) && (_POSIX_VERSION >= 200100)
#        define BOOST_HAS_STDINT_H
#     endif

      // POSIX version 2 requires <dirent.h>
#     if defined(_POSIX_VERSION) && (_POSIX_VERSION >= 199009L)
#        define BOOST_HAS_DIRENT_H
#     endif

      // POSIX version 3 requires <signal.h> to have sigaction:
#     if defined(_POSIX_VERSION) && (_POSIX_VERSION >= 199506L)
#        define BOOST_HAS_SIGACTION
#     endif
      // POSIX defines _POSIX_THREADS > 0 for pthread support,
      // however some platforms define _POSIX_THREADS without
      // a value, hence the (_POSIX_THREADS+0 >= 0) check.
      // Strictly speaking this may catch platforms with a
      // non-functioning stub <pthreads.h>, but such occurrences should
      // occur very rarely if at all.
#     if defined(_POSIX_THREADS) && (_POSIX_THREADS+0 >= 0) && !defined(BOOST_HAS_WINTHREADS) && !defined(BOOST_HAS_MPTASKS)
#        define BOOST_HAS_PTHREADS
#     endif

      // BOOST_HAS_NANOSLEEP:
      // This is predicated on _POSIX_TIMERS or _XOPEN_REALTIME:
#     if (defined(_POSIX_TIMERS) && (_POSIX_TIMERS+0 >= 0)) \
             || (defined(_XOPEN_REALTIME) && (_XOPEN_REALTIME+0 >= 0))
#        define BOOST_HAS_NANOSLEEP
#     endif

      // BOOST_HAS_CLOCK_GETTIME:
      // This is predicated on _POSIX_TIMERS (also on _XOPEN_REALTIME
      // but at least one platform - linux - defines that flag without
      // defining clock_gettime):
#     if (defined(_POSIX_TIMERS) && (_POSIX_TIMERS+0 >= 0))
#        define BOOST_HAS_CLOCK_GETTIME
#     endif

      // BOOST_HAS_SCHED_YIELD:
      // This is predicated on _POSIX_PRIORITY_SCHEDULING or
      // on _POSIX_THREAD_PRIORITY_SCHEDULING or on _XOPEN_REALTIME.
#     if defined(_POSIX_PRIORITY_SCHEDULING) && (_POSIX_PRIORITY_SCHEDULING+0 > 0)\
            || (defined(_POSIX_THREAD_PRIORITY_SCHEDULING) && (_POSIX_THREAD_PRIORITY_SCHEDULING+0 > 0))\
            || (defined(_XOPEN_REALTIME) && (_XOPEN_REALTIME+0 >= 0))
#        define BOOST_HAS_SCHED_YIELD
#     endif

      // BOOST_HAS_GETTIMEOFDAY:
      // BOOST_HAS_PTHREAD_MUTEXATTR_SETTYPE:
      // These are predicated on _XOPEN_VERSION, and appears to be first released
      // in issue 4, version 2 (_XOPEN_VERSION > 500).
#     if defined(_XOPEN_VERSION) && (_XOPEN_VERSION+0 >= 500)
#        define BOOST_HAS_GETTIMEOFDAY
#        if defined(_XOPEN_SOURCE) && (_XOPEN_SOURCE >= 500)
#           define BOOST_HAS_PTHREAD_MUTEXATTR_SETTYPE
#        endif
#     endif

#  endif


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About the Author

oshah
Web Developer
United States United States
Mr. Shah is a reclusive C++/C# developer lurking somewhere in the depths of the city of London. He learnt physics at Kings' College London and obtained a Master in Science there. Having earned an MCAD, he teeters on the brink of transitioning from C++ to C#, unsure of which language to jump to. Fortunately, he also knows how to use .NET interop to merge code between the two languages (which means he won't have to make the choice anytime soon).
 
His interests (apart from programming) are walking, football (the real one!), philosophy, history, retro-gaming, strategy gaming, and any good game in general.
 
He maintains a website / blog / FAQ / junk at shexec32.serveftp.net, where he places the best answers he's written to the questions you've asked. If you can find him, maybe you can hire Mr. Shah to help you with anything C++[/CLI]/C#/.NET related Smile | :) .

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