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STANDARDS(7)      DragonFly Miscellaneous Information Manual      STANDARDS(7)


NAME

     standards - standards supported by DragonFly


SYNOPSIS

     #define _XOPEN_SOURCE 600

     #include <sys/cdefs.h>


DESCRIPTION

     A number of "feature test macros", namely _POSIX_C_SOURCE and
     _XOPEN_SOURCE, can be used by applications to indicate desired sets of
     features (beyond those specified by the C standard) in the programming
     environment supplied by DragonFly.  These macros determine which
     prototypes are exposed by header files and so on.

     If neither _POSIX_C_SOURCE and _XOPEN_SOURCE are set, the programming
     environment defaults to Version 3 of the Single UNIX Specification
     ("SUSv3").  In addition, a number of BSD specific prototypes, definitions
     etc. are made visible.

   POSIX Standards (_POSIX_C_SOURCE)
     The value of the _POSIX_C_SOURCE macro determines which POSIX standard
     the programming environment conforms to.

     1           Make definitions conforming to IEEE Std 1003.1-1990
                 ("POSIX.1") visible.  Implies ISO/IEC 9899:1990 ("ISO C90").

     2           Additionally, make definitions conforming to IEEE Std
                 1003.2-1992 ("POSIX.2") visible.

     199009      Same as 1.

     199209      Same as 2.

     199309      Additionally, make definitions conforming to IEEE Std
                 1003.1b-1993 ("POSIX.1b") visible.

     199506      Additionally, make definitions conforming to IEEE Std
                 1003.1c-1995 ("POSIX.1c") visible.

     200112      Additionally, make definitions conforming to IEEE Std
                 1003.1-2001 ("POSIX.1") visible.  Implies ISO/IEC 9899:1999
                 ("ISO C99").  This is the default.

     200809      Additionally, make definitions conforming to IEEE Std
                 1003.1-2008 ("POSIX.1") visible.  Implies ISO/IEC 9899:1999
                 ("ISO C99").

     Defining _POSIX_C_SOURCE to any value lower than 199009 (other than 1 or
     2) makes it default to 198808 which makes definitions conforming to IEEE
     Std 1003.1-1988 ("POSIX.1") visible.  No C standard is implied in this
     case.

     Defining the obsolete _POSIX_SOURCE macro without defining
     _POSIX_C_SOURCE is equivalent to defining _POSIX_C_SOURCE to 198808.

   X/Open CAE Specifications (_XOPEN_SOURCE)
     The value of the _XOPEN_SOURCE macro determines which X/Open CAE
     specification the programming environment conforms to.

     500      Make definitions conforming to the Version 2 of the Single UNIX
              Specification ("SUSv2") visible.  Implies defining
              _POSIX_C_SOURCE to 199506.

     600      Make definitions conforming to the Version 3 of the Single UNIX
              Specification ("SUSv3") visible.  Implies defining
              _POSIX_C_SOURCE to 200112.  This is the default.

     700      Make definitions conforming to IEEE Std 1003.1-2008 ("POSIX.1")
              and to the corresponding XSI extensions visible.

     If both CAE and POSIX conformance is required, only _XOPEN_SOURCE can be
     set.


SEE ALSO

     http://pubs.opengroup.org/onlinepubs/9699919799/
         IEEE Std 1003.1-2008 ("POSIX.1")

     http://pubs.opengroup.org/onlinepubs/009695399/
         IEEE Std 1003.1-2004 ("POSIX.1")

     http://pubs.opengroup.org/onlinepubs/7908799/
         Version 2 of the Single UNIX Specification ("SUSv2")

     http://pubs.opengroup.org/onlinepubs/9695969499/toc.pdf
         X/Open System Interfaces and Headers Issue 4, Version 2 ("XSH4.2")


HISTORY

     A standards manual page first appeared in DragonFly 2.7.

DragonFly 5.5-DEVELOPMENT      December 20, 2012     DragonFly 5.5-DEVELOPMENT

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