mlock(3C)               LIBRARY FUNCTIONS               mlock(3C)



NAME
     mlock, munlock - lock (or unlock) pages in memory

SYNOPSIS
     #include <sys/types.h>
     int mlock(caddrt addr, sizet len);
     int munlock(caddrt addr, sizet len);

DESCRIPTION
     The function mlock uses the  mappings  established  for  the
     address  range  [addr,  addr  + len) to identify pages to be
     locked  in  memory.   The  effect  of  mlock(addr,  len)  is
     equivalent to memcntl(addr, len, MCLOCK, 0, 0, 0).  munlock
     removes  locks  established  with  mlock.   The  effect   of
     munlock(addr,  len)  is  equivalent  to  memcntl(addr,  len,
     MCUNLOCK, 0, 0, 0).  Locks established with mlock  are  not
     inherited  by  a  child  process  after  a  fork and are not
     nested.

RETURN VALUE
     Upon successful completion, the functions mlock and  munlock
     return  a  value  of 0; otherwise, they return a value of -1
     and set errno to indicate an error.

ERRORS
     See memcntl(2).

NOTES
     Use of  mlock  and  munlock  requires  that  the  user  have
     appropriate privileges.

SEE ALSO
     fork(2), memcntl(2), mmap(2), mlockall(3C), plock(2),
     sysconf(3C).





















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