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MADVISE(2)                NetBSD Programmer's Manual                MADVISE(2)


NAME

     madvise - give advice about use of memory


SYNOPSIS

     #include <sys/types.h>
     #include <sys/mman.h>

     int
     madvise(void *addr, size_t len, int behav);


DESCRIPTION

     The madvise() system call allows a process that has knowledge of its mem-
     ory behavior to describe it to the system.  The known behaviors are given
     in <sys/mman.h>:

     #define MADV_NORMAL     0       /* no further special treatment */
     #define MADV_RANDOM     1       /* expect random page references */
     #define MADV_SEQUENTIAL 2       /* expect sequential references */
     #define MADV_WILLNEED   3       /* will need these pages */
     #define MADV_DONTNEED   4       /* don't need these pages */
     #define MADV_SPACEAVAIL 5       /* insure that resources are reserved */


SEE ALSO

     mincore(2), mprotect(2), msync(2), munmap(2)


HISTORY

     The madvise function first appeared in 4.4BSD.

NetBSD 1.4                       June 9, 1993                                1