osf1 man page for versw

versw(3)						     Library Functions Manual							  versw(3)

NAME
       versw,  VERSW - Check the status of an operating system version switch on a single cluster member to determine whether the calling applica-
       tion can enable new features that are incompatible with the old version of the operating system

LIBRARY
       Standard C Library (libc.so, libc.a)

SYNOPSIS
       #include <sys/versw.h>

       #include <sys/clu.h>

       int VERSW();

       int versw (
	       ulong high_vers,
	       ulong low_vers );

PARAMETERS
       Most significant ulong of new version ID.

       Least significant ulong of new version ID.

DESCRIPTION
       The VERSW() macro and versw() function check the status of a version switch on a single cluster member to  determine  whether  the  calling
       application  can  enable  new features that are incompatible with the old version of the operating system. Applications can use the VERSW()
       macro to enable new features on cluster members participating in a rolling upgrade.

       The versw() function examines the versw_transition attribute of the generic subsystem of the member's /etc/sysconfigtab file  and  compares
       the  specified  high_vers and low_vers parameters to the new version of the running kernel. It then compares these parameters to the active
       version of the running kernel. The VERSW() macro provides a wrapper for the versw()  function.  Because	the  VERSW()  macro  automatically
       extracts  the high and low version values from /usr/sys/conf/version.id, we recommend that you use it rather than call the versw() function
       directly.

RETURN VALUES
       Upon completion, the VERSW() macro and versw() function return one of the following values: A version switch is in progress and the  speci-
       fied  new  version  is greater than the active version of the running kernel. The calling application should disable new, incompatible fea-
       tures and respond to all requests for such features with an error condition.  A version switch is in progess and the specified new  version
       is  less  than  or equal to new version of the running kernel, or a version switch is not in progress and the specified new version is less
       than or equal to the active version of the running kernel. The application can safely enable, and entertain requests for, all new features.
       A  version  switch  is in progress  and the specified new version is greater than the active version of the running kernel. The application
       should disable new, incompatible features. Although the application should respond to all requests for such  features  originating  on  the
       local  member with an error condition, it should be prepared to handle requests for new, incompatible features originating from other clus-
       ter members with grace and elan.

EXAMPLES
       #include <stdio.h> #include <sys/versw.h> #include <sys/clu.h> main() {
	       if(VERSW() == VERSW_ENABLE)
		       printf("Enable new features
");
	       else    printf("Disable new features
");
	       endif }

FILES
       Rolling upgrade blocking conditions directory.  Version switch header file.  High and low version values used by VERSW() macro.

RELATED INFORMATION
       Functions: clu_is_member(3), clu_get_info(3)

       Commands: versw(8)

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																	  versw(3)