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mpas_readonly_text(5)					 mpas_readonly_text(5)

NAME
       mpas_readonly_text  - dynamically enable or disable read-only text seg‐
       ment for 32-bit MPAS executables

VALUES
   Fail Safe
   Default
       semantics are disabled

   Allowed values
       or

DESCRIPTION
       This tunable allows 32-bit MPAS executables to have readonly text  seg‐
       ment. By default, text segment is writable for 32-bit MPAS executables.

       In  addition to setting this tunable to 1, the data segment should also
       start on a page aligned boundary (as set by the	tunable	 If  not,  the
       text  segment  will  continue  to be writable even when this tunable is
       set.

       When text and data are part of the same page, the text  segment	cannot
       be made read-only as data segment needs to be writable.

       When  the  tunable  is set to the default of 4K, data segment starts on
       its own page.  So, setting to 1 will always result in a read-only  text
       segment in this case.

       When  the  tunable is set to one of the supported page sizes other than
       4K, chances are that text and data segment are part of the  same	 page.
       In  that	 case,	setting to 1 may or may not give a read-only text seg‐
       ment.

       See the for more information on MPAS.

   Who Is Expected to Change This Tunable?
       System administrators who wish  to  have	 read-only  text  segment  for
       32-bit MPAS executables.

   Restrictions on Changing
       Changes to this tunable take effect immediately.

   When Should the Tunable Be Turned Off?
       If  there  is  any  legacy 32-bit MPAS application that depended on the
       writable attribute of the text segment, the tunable  should  be	turned
       off.

   When Should the Tunable Be Turned On?
       If a 32-bit MPAS application wishes to have its text segment read-only,
       this tunable must be turned on.

   What Other Tunables Should Be Changed at the Same Time?
       None.

WARNINGS
       All HP-UX kernel tunable parameters are release specific.  This parame‐
       ter  may	 be  removed or have its meaning changed in future releases of
       HP-UX.

       Installation of optional kernel software, from HP or other vendors, may
       cause  changes  to  tunable parameter values.  After installation, some
       tunable parameters may no longer be at the default or recommended  val‐
       ues.  For information about the effects of installation on tunable val‐
       ues, consult the documentation for the kernel software being installed.
       For  information	 about	optional  kernel  software  that  was  factory
       installed on your system, see at

AUTHOR
       was developed by HP.

SEE ALSO
       ld(1), base_pagesize(5).

			   Tunable Kernel Parameters	 mpas_readonly_text(5)

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