Understanding UNIX/Linux

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LEARN ABOUT HPUX

standards

standards(5)							File Formats Manual						      standards(5)

NAME

       standards - UNIX standards behavior on HP-UX

DESCRIPTION

       HP-UX  conforms	to  various UNIX standards.  In some cases, these standards 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  fea-
       ture  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 system 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)

UNIX for Dummies Questions & Answers