MSYNC(2) BSD System Calls Manual MSYNC(2)

NAME
     mmssyynncc - synchronize a mapped region

LLIIBBRRAARRYY
     Standard C Library (libc, -lc)

SYNOPSIS
     ##iinncclluuddee <>

     int
     mmssyynncc(void *addr, sizet len, int flags);

DESCRIPTION
     The mmssyynncc() system call writes modified whole pages back to the filesys-
     tem and updates the file modification time.  Only those pages containing
     addr and len-1 succeeding locations will be examined.

     The flags argument may be specified as follows:

     MSASYNC        Return immediately
     MSSYNC         Perform synchronous writes
     MSINVALIDATE   Invalidate all cached data

     The MSASYNC flag is not permitted to be combined with other flags.

RETURN VALUES
     If any errors occur, -1 is returned and errno is set to indicate the
     error.  Otherwise, a 0 value is returned.

EERRRROORRSS
     mmssyynncc() will fail if:

     [EBUSY]            Some of the specified addresses are locked and
                        MSINVALIDATE is specified.

     [EINVAL]           addr is not a multiple of the hardware page size.

     [EINVAL]           len is too large, or less than 1.

     [EINVAL]           flags is invalid (e.g., it combines MSASYNC with
                        another flag, which is not permitted).

     [EIO]              An I/O error occurs while writing to the file system.

     [ENOMEM]           The specified address range is outside of the address
                        range of the process or includes an unmapped page.

LEGACY SYNOPSIS
     ##iinncclluuddee <>
     ##iinncclluuddee <>

     The include file  is necessary.

SEE ALSO
     madvise(2), mincore(2), mprotect(2), munmap(2), compat(5)

HISTORY     The mmssyynncc() function first appeared in 4.4BSD.

BSD                              June 21, 1994                             BSD