mlock(3C)            COMPATIBILITY FUNCTIONS            mlock(3C)



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

SYNOPSIS
     #include <sys/types.h>

     int mlock(caddr_t addr, size_t len);
     int munlock(caddr_t addr, size_t 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, MC_LOCK, 0, 0, 0).  munlock
     removes  locks  established  with  mlock.   The  effect   of
     munlock(addr,  len)  is  equivalent  to  memcntl(addr,  len,
     MC_UNLOCK, 0, 0, 0).  Locks established with mlock  are  not
     inherited  by  a  child  process  after  a  fork and are not
     nested.

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

DIAGNOSTICS
     Upon successful completion, the functions mlock and  munlock
     return  0;  otherwise, they return -1 and set errno to indi-
     cate the error.

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























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