FSYNC(2)FSYNC(2)NAMEfsync - synchronize a file's in-core state with that on disk
SYNOPSISfsync(fd)
int fd;
DESCRIPTION
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.
RETURN VALUE
A 0 value is returned on success. A -1 value indicates an error.
ERRORS
The fsync fails if:
[EBADF] Fd is not a valid descriptor.
[EINVAL] Fd refers to a socket, not to a file.
[EIO] An I/O error occurred while reading from or writing to
the file system.
SEE ALSOsync(2), sync(8), update(8)4.2 Berkeley Distribution May 22, 1986 FSYNC(2)