|FSYNC(2)||System Calls Manual||FSYNC(2)|
LIBRARY¶Standard C Library (libc, -lc)
fsync() system call causes all modified data and attributes of the file referenced by the file descriptor 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.
fdatasync() system call causes all
modified data of fd to be moved to a permanent storage
fsync(), the system call does not
guarantee that file attributes or metadata necessary to access the file are
committed to the permanent storage.
fsync() system call should be used by
programs that require a file to be in a known state, for example, in
building a simple transaction facility. If the file metadata has already
been committed, using
fdatasync() can be more
fsync() calls are cancellation points.
fsync() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.
fdatasync() calls fail if:
SEE ALSO¶fsync(1), sync(2), syncer(4), sync(8)
fsync() system call appeared in 4.2BSD. The
fdatasync() system call appeared in FreeBSD 11.1.
fdatasync() system call currently does not guarantee that enqueued aio(4) requests for the file referenced by fd are completed before the syscall returns.
|February 6, 2018||Linux 4.19.0-6-amd64|