fsync(2)                                                 fsync(2)



NAME
     fsync - synchronize a file's in-core state with that on disk

SYNOPSIS
     int fsync(fd)
     int fd;

DESCRIPTION
     fsync causes all modified data and attributes of fd to be
     moved to a permanent storage device.  This normally results
     in all in-core modified copies of buffers for the associated
     file to be written to a disk.

     fsync should be used by programs which require a file to be
     in a known state; for example in building a simple
     transaction facility.

STATUS MESSAGES AND VALUES
     A 0 value is returned on success.  A -1 value indicates an
     error.

     The fsync command fails if:

     EBADF
          fd is not a valid descriptor.

     EINVAL
          fd refers to a socket, not to a file.

LIMITATIONS
     The current implementation of this call is expensive for
     large files.

SEE ALSO
     sync(2)

     sync(1) in A/UX Command Reference


















January 1992                                                    1