fsync man page on NeXTSTEP

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FSYNC(2)							      FSYNC(2)

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

SYNOPSIS
       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 that require a file to be in  a	 known
       state, for example, in building a simple transaction facility.

RETURN VALUE
       A 0 value is returned on success.  A -1 value indicates an error.

ERRORS
       The fsync fails if:

       [EBADF]	      Fd is not a valid descriptor.

       [EINVAL]	      Fd refers to a socket, not to a file.

       [EIO]	      An  I/O  error occurred while reading from or writing to
		      the file system.

SEE ALSO
       sync(2), sync(8), update(8)

4.2 Berkeley Distribution	 May 22, 1986			      FSYNC(2)
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