MADVISE(2) BSD Programmer's Manual MADVISE(2)NAMEmadvise - 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
memory behavior to describe it to the system. The possible behaviors are:
MADV_NORMAL No further special treatment needed.
MADV_RANDOM Expect random page access patterns.
MADV_SEQUENTIAL Expect sequential page references.
MADV_WILLNEED The pages will be referenced soon.
MADV_DONTNEED The pages will not be referenced soon.
MADV_SPACEAVAIL Ensure that resources are reserved.
MADV_FREE The pages don't contain any useful data and can be recy-
cled.
RETURN VALUES
Upon successful completion, a value of 0 is returned. Otherwise, a value
of -1 is returned and errno is set to indicate the error.
SEE ALSOmincore(2), minherit(2), mprotect(2), msync(2), munmap(2)HISTORY
The madvise function first appeared in 4.4BSD.
MirOS BSD #10-current June 9, 1993 1