fsync(2)
NAME
fsync − synchronize a file’s in-core state with that on disk
SYNTAX
fsync(fd)
int fd;
DESCRIPTION
The fcync system call causes all modified data and attributes of fd to be moved to a permanent storage device. This results in all in-core modified copies of buffers for the associated file to be written to a disk.
The fsync call should be used by programs which require a file to be in a known state, for example, in building a simple transaction facility.
A 0 value is returned on success. A −1 value indicates an error.
DIAGNOSTICS
The fsync call fails if:
[EBADF] The fd argument is not a valid descriptor.
[EINVAL] The fd argument refers to a socket.
[EIO] An I/O error occurred while reading from or writing to the file system.