IABSD.fr/src/lib/libc/sys/msync.2

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• Author : schwarze
  Date : 2021-06-30 18:46:49
  Hash : 852d73fb
  Message : more trivial .Ar -> .Fa replacements in syscall manuals

• lib/libc/sys/msync.2

• .\"	$OpenBSD: msync.2,v 1.29 2021/06/30 18:46:49 schwarze Exp $
  .\"	$NetBSD: msync.2,v 1.8 1995/10/12 15:41:09 jtc Exp $
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  .\"	@(#)msync.2	8.1 (Berkeley) 6/9/93
  .\"
  .Dd $Mdocdate: June 30 2021 $
  .Dt MSYNC 2
  .Os
  .Sh NAME
  .Nm msync
  .Nd synchronize a mapped region
  .Sh SYNOPSIS
  .In sys/mman.h
  .Ft int
  .Fn msync "void *addr" "size_t len" "int flags"
  .Sh DESCRIPTION
  The
  .Fn msync
  system call writes all pages with shared modifications
  in the specified region starting from
  .Fa addr
  and continuing for
  .Fa len
  bytes.
  .Fa addr
  should be a multiple of the page size.
  Any required synchronization of memory caches
  will also take place at this time.
  Filesystem operations on a file that is mapped for shared modifications
  are unpredictable except after an
  .Fn msync .
  .Pp
  The
  .Fa flags
  argument is the bitwise OR of zero or more of the following values:
  .Bd -literal -offset indent
  MS_ASYNC	Perform asynchronous writes.
  MS_SYNC		Perform synchronous writes.
  MS_INVALIDATE	Invalidate cached data after writing.
  .Ed
  .Sh RETURN VALUES
  .Rv -std
  .Sh ERRORS
  The following errors may be reported:
  .Bl -tag -width Er
  .It Bq Er EBUSY
  The
  .Dv MS_INVALIDATE
  flag was specified and a portion of the specified region
  was locked with
  .Xr mlock 2 .
  .It Bq Er EINVAL
  The specified
  .Fa flags
  argument was invalid.
  .It Bq Er EINVAL
  The
  .Fa addr
  parameter was not page aligned or
  .Fa addr
  and
  .Fa size
  specify a region that would extend beyond the end of the address space.
  .It Bq Er ENOMEM
  Addresses in the specified region are outside the range allowed
  for the address space of the process, or specify one or more pages
  which are unmapped.
  .It Bq Er EIO
  An I/O error occurred while writing.
  .El
  .Sh SEE ALSO
  .Xr madvise 2 ,
  .Xr minherit 2 ,
  .Xr mprotect 2 ,
  .Xr munmap 2
  .Sh HISTORY
  The
  .Fn msync
  function has been available since
  .Bx 4.3 Net/2 .
  It was modified to conform to
  .St -p1003.1b-93
  .Sh BUGS
  Writes are currently done synchronously even if the
  .Dv MS_ASYNC
  flag is specified.