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patch_active_text(5)					  patch_active_text(5)

NAME
       patch_active_text  -  dynamically  enable or disable running executable
       text to be modified via mprotect()

VALUES
   Fail Safe
   Default
       semantics is enabled

   Allowed values
       or

DESCRIPTION
       This tunable allows write access to text of a running process such that
       the  active text can be modified.  When this tunable is enabled, can be
       used with a special flag, to modify the text of a running executable.

       By default, does not work on text of a process.	Enabling  the  tunable
       allows  to  work	 on  text segments of a process.  Making text writable
       will create a private copy of the text to the process using  this  fea‐
       ture.

       Once  with  special  flag  allows  running text to be modified, further
       invocations of on text of a process with	 other	prot  flags  are  also
       allowed.

       For must always be used with (see mprotect(2)).	must always be used on
       text address range.

       After the first invocation of further mprotect(2) calls	will  work  on
       text  segments  of  process  with any other prot flags; in other words,
       will work on text with or any combinations  of  the  above.   The  only
       requirement is that both these flags must be invoked first.

   Who Is Expected to Change This Tunable?
       System administrators who wish to change the default behavior.

   Restrictions on Changing
       Changes to this tunable take effect immediately.

   When Should the Tunable Be Turned Off?
       If  an application expects to fail on text segments, the tunable should
       be turned off.

   What Are the Side Effects of Turning the Tunable Off?
       Applications will no longer be able to use on text of a process.

   When Should the Tunable Be Turned On?
       If an application wants its text segment to be writable and also	 wants
       to  be  able  to work on text of processes, this tunable must be turned
       on.  Making text writable will create a private copy of the text to the
       process using this feature.

   What Are the Side Effects of Turning the Tunable On?
       Memory  consumption  in the system will increase.  This is because with
       the process will create a private copy of  the  shared  text  on	 first
       invocation.   It	 should also be noted that large page benefits on text
       segments will be lost.

   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
       mprotect(2), copy_on_write(5)

			   Tunable Kernel Parameters	  patch_active_text(5)

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