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BSD 2.11 - man page for fsync (bsd section 2)

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FSYNC(2)										 FSYNC(2)

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

       int fd;

       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  associ-
       ated 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.

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

       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.

       sync(2), sync(8), update(8)

4.2 Berkeley Distribution		   May 22, 1986 				 FSYNC(2)
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