File: libtool.info,  Node: Interfaces,  Next: Libtool versioning,  Up: Versioning

7.1 What are library interfaces?
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Interfaces for libraries may be any of the following (and more):

   • global variables: both names and types

   • global functions: argument types and number, return types, and
     function names

   • standard input, standard output, standard error, and file formats

   • sockets, pipes, and other inter-process communication protocol
     formats

   Note that static functions do not count as interfaces, because they
are not directly available to the user of the library.