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STANDARDS(7)	     BSD 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 proto‐
     types 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 ISO/IEC 9945-1:1990 (“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.1”) visible.

     199506  Additionally, make definitions conforming to IEEE Std
	     1003.1c-1995 (“POSIX.1”) 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 specifi‐
     cation the programming environment conforms to.

     500  Make defintions 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.

HISTORY
     A standards manual page first appeared in DragonFly 2.7.

BSD			       November 6, 2010				   BSD

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