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User-visible changes in Socket version 1.1:

  - Ported to more Platforms (SGI Irix, IBM AIX, CDC EP/IX, ISC 3.0,
    System V R4, Sequent)

  - fixed getopt()-related bug in main() (opt declared as int now).

  - fixed SIGWINCH-related bug (socket no longer exits on SIGWINCH).

  - Background mode (-b option)

  - -f option to fork child 

  - fixed bug in server mode concerning the "Connection from..."
    message

  - slightly more adequate signal handling and messages