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 MPE/iX Developer's Kit Reference Manual Volume I: HP 3000 MPE/iX Computer Systems > Chapter 2 Using the POSIX/iX Library

Specifying the _POSIX_SOURCE Feature Test Macro
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An application that includes a header described by the POSIX.1 standard must specify the _POSIX_SOURCE feature test macro prior to any instance of that header being included in the source file. When _POSIX_SOURCE is specified in the source file, the following conditions are true:

  • All symbols required by the POSIX.1 standard are made visible to the application.

  • Symbols that are explicitly permitted, but not required, by the POSIX.1 standard are made visible to the application.

  • Additional symbols not required or explicitly permitted by the POSIX.1 standard are not made visible.



Organization of the POSIX/iX Library
  		 


Input/Output Considerations  
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