standards(5)							  standards(5)

NAME
       standards - UNIX standards behavior on HP-UX

DESCRIPTION
       HP-UX  conforms	to various UNIX standards.  In some cases, these stan‐
       dards conflict.	This manpage describes the  methods  that  programmers
       and  users  must	 follow	 to  have  an  application conform and execute
       according to a particular UNIX standard.

   UNIX Standard Conformant Programmer Environment
       The following table lists feature test macros and environment variables
       that  must  be  defined while compiling an application.	Both a feature
       test macro and an environment variable must be defined while  compiling
       the application so that the application conforms and executes according
       to a particular UNIX standard.  Otherwise, the behavior is undefined.

	      Standard	  Feature Test Macros to be	 Environment variable
			  defined during compilation	 to be set

	      UNIX 95	  _XOPEN_SOURCE_EXTENDED=1	 UNIX95	 or
							 UNIX_STD=95  or
							 UNIX_STD=1995

	      UNIX 2003	  _XOPEN_SOURCE=600		 UNIX_STD=2003

       The compiler uses the feature test macros  to  obtain  the  appropriate
       namespace  from	the  header  files.  The compiler uses the environment
       variable to link in an  appropriate  object  file  to  the  executable.
       Using  the environment variable customizes libc to match UNIX standards
       for various functions.

       If an application has already been compiled for default HP-UX  behavior
       or  for	one  particular	 standard, and needs to change to a particular
       UNIX standard behavior, recompile the application as specified  in  the
       above table.

       For an HP-UX command to conform to a particular UNIX standard behavior,
       the application has to set the corresponding  environment  variable  as
       specified in the above table before executing that command.

   UNIX Standard Conformant User Environment
       To  enable  a particular UNIX standard conformant user environment, set
       the corresponding environment variable as defined in the above table.

EXAMPLES
       The following examples shows an application example.  To have the  sys‐
       tem be conformant to UNIX2003 behavior, set the environment variable to
       and define the feature test macro before compilation.

       The following example changes the command to have  UNIX95  behavior  by
       setting one of the environment variables to or to before executing that
       command.	 There are three ways of setting the environment variable  for
       UNIX95:

       or

       or

SEE ALSO
       cc(1), stdsyms(5).

								  standards(5)

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