The fd_prestat_dir_name() function is used to retrieve the directory name associated with a preopened file descriptor (fd). It retrieves the directory name from the file system and writes it into the provided buffer (path) up to the specified length (path_len). The function returns an error code indicating the success or failure of the operation.
When working with preopened file descriptors, which represent files opened by the WebAssembly module's host environment, it can be useful to obtain information about the directory from which the file was opened. The fd_prestat_dir_name() function provides a convenient way to retrieve the directory name associated with a preopened file descriptor.
Note
The fd_prestat_dir_name() function retrieves the directory name associated with a preopened file descriptor. It writes the directory name into the provided buffer (path) up to the specified length (path_len). The function returns an error code to indicate the success or failure of the operation. If the directory name is successfully written into the buffer, it returns Errno::Success. Otherwise, it returns an appropriate error code.