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fsync(2)							      fsync(2)

NAME
       fsync, fdatasync - synchronize a file's in-core and on-disk states

SYNOPSIS
DESCRIPTION
       and  cause  all modified data and attributes of fildes to be moved to a
       permanent storage device.  This normally results in all	in-core	 modi‐
       fied copies of buffers for the associated file to be written to a disk.
       and apply to ordinary files, and apply to block special devices on sys‐
       tems which permit I/O to block special devices.

       and  should  be	used  by programs that require a file to be in a known
       state, such as when building a simple transaction facility.

       causes all modified data and file  attributes  of  fildes  required  to
       retrieve the data to be written to disk.

       causes  all  modified data and all file attributes of fildes (including
       access time, modification time and status change time) to be written to
       disk.

       Together, and constitute support for File Synchronization.

RETURN VALUE
       and  return  0 on success or −1 if an error occurs, and set to indicate
       the error.

ERRORS
       fsync and fdatasync fail if any of the following conditions are encoun‐
       tered:

	      [EBADF]	     fildes is not a valid descriptor.

	      [EINVAL]	     fildes refers to a file type to which or does not
			     apply.

WARNINGS
       The current implementation of these functions is inefficient for	 large
       files.

AUTHOR
       was developed by the University of California, Berkeley and HP.

SEE ALSO
       fcntl(2), fcntl(5), open(2), select(2), sync(2), sync(1M), unistd(5).

STANDARDS CONFORMANCE
								      fsync(2)

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