.\" Copyright (c) 1983 Regents of the University of California.
.\" All rights reserved. The Berkeley software License Agreement
.\" specifies the terms and conditions for redistribution.
.\" @(#)fsync.2 6.4 (Berkeley) 5/22/86
.TH FSYNC 2 "May 22, 1986"
fsync \- synchronize a file's in-core state with that on disk
causes all modified data and attributes of \fIfd\fP
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.
should be used by programs that require a file to be
in a known state, for example, in building a simple transaction
A 0 value is returned on success. A \-1 value indicates
The \fIfsync\fP fails if:
\fIFd\fP is not a valid descriptor.
\fIFd\fP refers to a socket, not to a file.
An I/O error occurred while reading from or writing to the file system.
sync(2), sync(8), update(8)