plock man page on DigitalUNIX

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plock(2)							      plock(2)

       plock - Lock the text and/or data segments of a process in memory

       #include <sys/lock.h>

       int plock(
	       int opr );

       Specifies one of the following operations: Locks the text and data seg‐
       ments into memory.  Locks the text segment into memory.	Locks the data
       segment into memory.  Removes locks.

       The  plock()  function locks or unlocks a process's 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() call may or  may  not
       be locked in memory, depending on the specific acquisition method. Mem‐
       ory acquired by using the brk() or sbrk() function will	be  locked  if
       the  data segment was locked. Memory acquired by means of the mmap() or
       vm_allocate() function will not be locked.

       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.

       If the plock() function fails, errno may be set to one of the following
       values: There are insufficient resources to perform the operation.  One
       of the following occurred: 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.
       The caller does not have appropriate privilege.

       Functions: brk(2), mmap(2)


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