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    The following form allows you to view linux man pages.

    Command:

    msync

    
    
    

    SYNOPSIS

           #include <sys/mman.h>
    
           int msync(void *addr, size_t length, int flags);
    
    
    

    DESCRIPTION

           msync()  flushes  changes  made  to the in-core copy of a file that was
           mapped into memory using mmap(2) back to disk.   Without  use  of  this
           call  there  is  no guarantee that changes are written back before mun-
           map(2) is called.  To be more precise, the part of the file that corre-
           sponds  to the memory area starting at addr and having length length is
           updated.
    
           The flags argument may have the bits MS_ASYNC, MS_SYNC, and  MS_INVALI-
           DATE  set,  but not both MS_ASYNC and MS_SYNC.  MS_ASYNC specifies that
           an update be scheduled, but the call returns immediately.  MS_SYNC asks
           for  an  update  and  waits  for it to complete.  MS_INVALIDATE asks to
           invalidate other mappings of the same file (so that they can be updated
           with the fresh values just written).
    
    
    

    RETURN VALUE

           On  success,  zero is returned.  On error, -1 is returned, and errno is
           set appropriately.
    
    
    

    ERRORS

           EBUSY  MS_INVALIDATE was specified in flags, and a memory  lock  exists
                  for the specified address range.
    
           EINVAL addr  is  not  a  multiple  of  PAGESIZE;  or any bit other than
                  MS_ASYNC | MS_INVALIDATE | MS_SYNC is  set  in  flags;  or  both
                  MS_SYNC and MS_ASYNC are set in flags.
    
           ENOMEM The indicated memory (or part of it) was not mapped.
    
    
    

    CONFORMING TO

           POSIX.1-2001.
    
           This  call was introduced in Linux 1.3.21, and then used EFAULT instead
           of ENOMEM.  In Linux 2.4.19 this was changed to the POSIX value ENOMEM.
    
    
    

    AVAILABILITY

           On    POSIX    systems    on   which   msync()   is   available,   both
           _POSIX_MAPPED_FILES   and   _POSIX_SYNCHRONIZED_IO   are   defined   in
           <unistd.h> to a value greater than 0.  (See also sysconf(3).)
    
    
    

    SEE ALSO

           mmap(2)
    
           B.O. Gallmeister, POSIX.4, O'Reilly, pp. 128-129 and 389-391.
    
    
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