Function fuse_buf_copy 

pub unsafe extern "C" fn fuse_buf_copy(
    dst: *mut fuse_bufvec,
    src: *mut fuse_bufvec,
    flags: fuse_buf_copy_flags,
) -> ssize_t

Copy data from one buffer vector to another

@param dst destination buffer vector @param src source buffer vector @param flags flags controlling the copy @return actual number of bytes copied or -errno on error