hpux man page for intro

intro(2)							System Calls Manual							  intro(2)

NAME
       intro - introduction to system calls

DESCRIPTION
       This  section  describes  all  of  the system calls.  All of these calls return a function result.  This result indicates the status of the
       call.  Typically, a zero or positive result indicates that the call completed successfully, and -1  indicates  an  error.   The	individual
       descriptions specify the details.  An error number is also made available in the external variable (see errno(2)).  Note: is not cleared on
       successful calls.  Therefore, it should be tested only after an error has been indicated.

SEE ALSO
       intro(3), errno(2), hier(5), introduction(9).

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																	  intro(2)