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MSYNC (2) | System calls | Unix Manual Pages | :man

NAME

msync - synchronize a mapped region

CONTENTS

Library
Synopsis
Description
Return Values
Errors
See Also
History
Bugs

LIBRARY


.Lb libc

SYNOPSIS


.In sys/mman.h int msync "void *addr" "size_t len" "int flags"

DESCRIPTION

The msync system call writes any modified pages back to the file system and updates the file modification time. If len is 0, all modified pages within the region containing addr will be flushed; if len is non-zero, only those pages containing addr and len-1 succeeding locations will be examined. The flags argument may be specified as follows:

MS_ASYNC Return immediately
MS_SYNC Perform synchronous writes
MS_INVALIDATE Invalidate all cached data

RETURN VALUES


.Rv -std msync

ERRORS

The msync system call will fail if:
[EBUSY]
Some or all of the pages in the specified region are locked and MS_INVALIDATE is specified.
[EINVAL]
The addr argument is not a multiple of the hardware page size.
[EINVAL]
The len argument is too large or negative.
[EINVAL]
The flags argument was both MS_ASYNC and MS_INVALIDATE. Only one of these flags is allowed.

SEE ALSO

madvise(2), mincore(2), mlock(2), mprotect(2), munmap(2)

HISTORY

BUGS


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