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ENDHOSTENT(3P)             POSIX Programmer's Manual            ENDHOSTENT(3P)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may dif-
       fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface  may  not  be
       implemented on Linux.

NAME
       endhostent, gethostent, sethostent - network host database functions

SYNOPSIS
       #include <netdb.h>

       void endhostent(void);
       struct hostent *gethostent(void);
       void sethostent(int stayopen);


DESCRIPTION
       These  functions  shall  retrieve  information  about  hosts.  This information is considered to be stored in a
       database that can be accessed sequentially or randomly. The implementation of this database is unspecified.

       Note:  In many cases this database is implemented by  the  Domain  Name  System,  as  documented  in  RFC 1034,
              RFC 1035, and RFC 1886.


       The  sethostent()  function shall open a connection to the database and set the next entry for retrieval to the
       first entry in the database. If the stayopen argument is non-zero, the connection shall not be closed by a call
       to gethostent(), gethostbyname(), or gethostbyaddr(), and the implementation may maintain an open file descrip-
       tor.

       The gethostent() function shall read the next entry in the database, opening and closing a  connection  to  the
       database as necessary.

       Entries  shall  be  returned  in  hostent  structures. Refer to gethostbyaddr() for a definition of the hostent
       structure.

       The endhostent() function shall close the connection to the database, releasing any open file descriptor.

       These functions need not be reentrant. A function that is not required to be reentrant is not  required  to  be
       thread-safe.

RETURN VALUE
       Upon  successful  completion,  the  gethostent()  function shall return a pointer to a hostent structure if the
       requested entry was found, and a null pointer if the end of the database was reached or the requested entry was
       not found.

ERRORS
       No errors are defined for endhostent(), gethostent(), and sethostent().

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       The  gethostent()  function may return pointers to static data, which may be overwritten by subsequent calls to
       any of these functions.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       endservent(), gethostbyaddr(), the Base Definitions volume of IEEE Std 1003.1-2001, <netdb.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Stan-
       dard  for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifica-
       tions Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers,  Inc  and  The
       Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Stan-
       dard, the original IEEE and The Open Group Standard is the referee  document.  The  original  Standard  can  be
       obtained online at http://www.opengroup.org/unix/online.html .



IEEE/The Open Group                  2003                       ENDHOSTENT(3P)