- fd
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On success, zero is returned. On error, -1 is returned and Stdlib.GetLastError returns the translated error.
Usage
The fsync() fails if:
Error Details Errno.EBADF The fd argument is not a valid descriptor.
Errno.EINVAL The fd argument refers to a socket, not to a file.
Errno.EIO An I/O error occurred while reading from or writing to the file system.
The fsync() system call 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.
The 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.