madvise(2) - NetBSD Manual Pages

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MADVISE(2)                NetBSD System Calls Manual                MADVISE(2)


NAME
madvise -- give advice about use of memory
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#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 /* ensure that resources are reserved */ #define MADV_FREE 6 /* pages are empty, free them */
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.
ERRORS
madvise() will fail if: [EINVAL] Invalid parameters were provided.
SEE ALSO
mincore(2), mprotect(2), msync(2), munmap(2)
HISTORY
The madvise system call first appeared in 4.4BSD, but until NetBSD 1.5 it did not perform any of the requests on, or change any behavior of the address range given. NetBSD 4.0 October 7, 2006 NetBSD 4.0
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