ARCHIVE_WRITE_FINISH_ENTRY(3) manual page
archive_write_finish_entry - functions for creating archives
Streaming Archive Library (libarchive, -larchive)
archive_write_finish_entry(struct archive *);
Close out the entry just written. In particular, this writes out the final padding required by some formats. Ordinarily, clients never need to call this, as it is called automatically by archive_write_next_header() and archive_write_close() as needed.
This function returns ARCHIVE_OK on success, or one of several non-zero error codes for errors. Specific error codes include: ARCHIVE_RETRY for operations that might succeed if retried, ARCHIVE_WARN for unusual conditions that do not prevent further operations, and ARCHIVE_FATAL for serious errors that make remaining operations impossible.
Detailed error codes and textual descriptions are available from the archive_errno() and archive_error_string() functions.