fsync man page on 4.4BSD

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FSYNC(2)		    BSD System Calls Manual		      FSYNC(2)

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

     #include <unistd.h>

     fsync(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 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.

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

     The fsync() fails if:

     [EBADF]		is not a valid descriptor.

     [EINVAL]		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)

     The fsync function call appeared in 4.2BSD.

4.2 Berkeley Distribution	 June 4, 1993	     4.2 Berkeley Distribution

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