plock man page on HP-UX

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plock(2)							      plock(2)

NAME
       plock() - lock process, text, data, stack, or shared library in memory

SYNOPSIS
DESCRIPTION
       The  system call allows the calling process to lock the text segment of
       the process (text lock), its data segment (data lock), or both its text
       and  data  segment (process lock) into memory.  Stack segments are also
       locked when data segments are locked.  Shared library text  and	shared
       library data segments (shlib lock) can also be locked.  Locked segments
       are immune to all routine swapping.  also allows these segments	to  be
       unlocked.

       The  effective  user  ID of the calling process must be a user with the
       privilege.

       op must be one of the following:

	      Lock text and data segments into memory (process lock)

	      Lock text segment into memory (text lock)

	      Lock data segment into memory (data lock)

	      Remove locks

	      Lock shared  library  text  and  shared  library	data  segments
	      (shared library lock)

	      Lock  text, data and shared library text and shared library data
	      segments
				  into	memory	(process  and  shared  library
				  lock)

	      Lock  text, shared library text and shared library data segments
	      into memory
				  (text and shared library lock)

	      Lock data, shared library text and shared library data  segments
	      into memory
				  (data and shared library lock)

	      Although	and the family of functions may be used together in an
	      application, each may affect the other in unexpected ways.  This
	      practice is not recommended.

   Security Restrictions
       Some or all of the actions associated with this system call require the
       privilege.  Processes owned by the superuser have this privilege.  Pro‐
       cesses  owned by other users may have this privilege, depending on sys‐
       tem configuration.  See privileges(5) for more information about privi‐
       leged access on systems that support fine-grained privileges.

RETURN VALUE
       returns the following values:

	      Successful completion.
	      Failure.
		     The  requested  operation	is  not	 performed.  is set to
		     indicate the error.

ERRORS
       If fails, is set to one of the following values.

	      op	     is equal to and a process lock, a text lock, or a
			     data lock already exists on the calling process.

	      op	     is	 equal	to  and	 a  text  lock or process lock
			     already exists on the calling process.

	      op	     is equal to and a	data  lock,  or	 process  lock
			     already exists on the calling process.

	      op	     is	 equal	to  and	 no type of lock exists on the
			     calling process.

	      op	     is equal to and  there  are  no  unlocked	shared
			     library segments in the calling process.

	      op	     is equal to and a process lock, a text lock, or a
			     data lock already exists on the calling process.

	      op	     is equal to and  a	 text  lock  or	 process  lock
			     already exists on the calling process.

	      op	     is	 equal	to  and	 a  data lock, or process lock
			     already exists on the calling process.

	      op	     is not equal to one of the values specified in

	      is not allowed in a
			     window.  See vfork(2).

	      There is not enough lockable memory in the system
			     to satisfy the locking request.

	      The effective user ID of the calling process
			     is not a user with the privilege.

EXAMPLES
       The following call to locks the calling process in memory:

SEE ALSO
       setprivgrp(1M), exec(2),	 exit(2),  fork(2),  getprivgrp(2),  mlock(2),
       vfork(2), privileges(5).

STANDARDS CONFORMANCE
								      plock(2)
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