standards.5 (2010 09)

standards(5) 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 exe-

cute 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 com-

piling an application. Both a feature test macro and an environment variable must be deﬁned while com-

piling the application so that the application conforms and executes according to a particular UNIX stan-

dard. 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

UNIX_STD environment variable to 2003 and deﬁne the _XOPEN_SOURCE=600

feature test macro before compilation.

$ export UNIX_STD=2003

$ c99 -D_XOPEN_SOURCE=600 foo.c

The following example changes the ls command to have UNIX95 behavior by setting one of the environ-

ment variables to UNIX95 or to UNIX_STD=95 before executing that command. There are three ways of

setting the environment variable for UNIX95:

$ export UNIX95=1

$lsoptions

$ export UNIX_STD=95

$lsoptions

$ export UNIX_STD=1995

$lsoptions

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standards(5) 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.
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(Notes) A (Notes) sA 2 Hewlett-Packard Company −1− HP-UX 11i Version 3: September 2010