libio-sessiondata-perl 1.03-1 (i386 binary) in ubuntu focal

 This package contains the modules IO::SessionData and IO::SessionSet which
 deal with non-blocking I/O.
 .
 IO::SessionData is a wrapper around IO::Socket handling e.g. partial writes.
 IO::SessionSet is similar to IO::Select. It handles multiple IO::SessionData
 objects offers the ability to buffer partial writes.
 .
 For a detailed documentation, cf. the original author's book:
  Lincoln D. Stein: Network Programming with Perl.
  Addison-Wesley, 2001, pp. 371.