|FSYNC(2)||System Calls Manual||FSYNC(2)|
— synchronize a file's in-core state with that on
function 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
function is similar to
fsync() except that it only
guarantees modified data (and metadata necessary to read that data) is
committed to storage. Other file modifications may be left
fdatasync() should be used by programs that
require a file to be in a known state, for example, in building a simple
fdatasync() fail with
EIO, the state of the on-disk data may have been
only partially written. To guard against potential inconsistency, future
calls will continue failing until all references to the file are closed.
fdatasync() functions return the value 0 if
successful; otherwise the value -1 is returned and the global
variable errno is set to indicate the error.
fdatasync() functions fail if:
fdatasync() functions conform to
IEEE Std 1003.1-2008 (“POSIX.1”).
fsync() system call first appeared in
4.1cBSD, and the
function has been available since OpenBSD 5.4.
fdatasync() function is currently a
fsync(), so it synchronizes more
state than necessary.
|April 18, 2019||OpenBSD-current|