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munlock(2)							    munlock(2)

NAME
       munlock() - unlock a segment of the process virtual address space

SYNOPSIS
DESCRIPTION
       The  system  call allows the calling process to unlock a segment of the
       process virtual address space that may have been previously locked with
       or Upon successful completion of the pages within the specified segment
       are subject to routine paging and/or swapping.

       addr must be a valid address in	the  process  virtual  address	space.
       addr+len	 must  also  be a valid address in the process virtual address
       space.

       Pages are unlocked at page boundaries that  encompass  the  range  from
       addr  to addr+len.  If any address within the range is not a valid part
       of the process virtual address space,  an  error	 is  returned  and  no
       unlocks	are  performed.	 However, no error is reported for valid pages
       within the range that are not already locked, since their state at  the
       completion of the call is as desired.

       Regardless  of  how many times a process locks a page, a single or will
       unlock it.  An of a page within a range specified in an call results in
       only the range specified in the being unlocked.

       When  memory  is shared by multiple processes and mlocks are applied to
       the same physical page by multiple processes,  a	 page  remains	locked
       until the last lock is removed from that page.

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

       Although and the family of functions may be used together in an	appli‐
       cation, 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:

	      One or more addresses in the specified range is not valid within
			     the process address space.

	      The	     parameter was zero.

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

EXAMPLES
       The following call to unlocks the first 10 pages of the calling process
       address space:

SEE ALSO
       setprivgrp(1M), getprivgrp(2),  mlock(2),  mlockall(2),	munlockall(2),
       plock(2), privileges(5).

STANDARDS CONFORMANCE
								    munlock(2)

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