osf1 man page for plock

plock(2)							System Calls Manual							  plock(2)

NAME
       plock -	Locks a process' text and/or data segments in memory

SYNOPSIS
       #include <sys/lock.h>
       int plock(      int opr) ;

PARAMETERS
       Specifies  one  of  the following operations: Locks the text and data segments into memory.  Locks the text segment into memory.  Locks the
       data segment into memory.  Removes locks.

DESCRIPTION
       The plock() function locks or unlocks a process' text segments, data segments, or both in physical memory.  When locked, the physical pages
       containing the text or data segment will not be paged out.  It is an error to lock a segment that is already locked.

       The caller must have superuser privilege to use the plock() function.

       Note  that  memory  acquired  subsequent  to  a	plock() function may or may not be locked in memory, depending on the specific acquisition
       method.	Memory acquired using the brk() function (or the sbrk() function) is locked if the data segment was locked.  Memory  acquired  via
       the mmap() or vm_allocate() functions will not be locked.

RETURN VALUES
       Upon successful completion, a value of 0 (zero) is returned to the calling process.  Otherwise, a value of -1 is returned and  errno is set
       to indicate the error.

ERRORS
       If the plock() function fails, errno may be set to one of the following values: The caller does not have appropriate privilege.	There  are
       insufficient  resources	to  perform  the  operation.   The  opr parameter is PROCLOCK, but the text segment or the data segment is already
       locked.	The opr parameter is TXTLOCK, but the text segment is already locked.  The opr parameter is  DATLOCK,  but  the  data  segment	is
       already locked.	The opr parameter is UNLOCK, but neither the text segment nor the data segment is locked.

RELATED INFORMATION
       Functions: brk(2), mmap(2) delim off

																	  plock(2)