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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 differ (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  informa-
       tion  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(), and the implementation may maintain an open
       file descriptor.
       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.
       The  endhostent()  function shall close the connection to the database,
       releasing any open file descriptor.
       These functions need not 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.
       The  application  shall  not  modify  the structure to which the return
       value points, nor any storage areas pointed to by pointers  within  the
       structure.  The  returned  pointer,  and pointers within the structure,
       might be invalidated or the structure or the  storage  areas  might  be
       overwritten by a subsequent call to gethostent().
ERRORS
       No errors are defined for endhostent(), gethostent(), and sethostent().
       The following sections are informative.
EXAMPLES
       None.
APPLICATION USAGE
       None.
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       endservent()
       The Base Definitions volume of POSIX.1-2008, <netdb.h>
COPYRIGHT
       Portions  of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  In  the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard
       is  the  referee document. The original Standard can be obtained online
       at http://www.unix.org/online.html .
       Any typographical or formatting errors that appear  in  this  page  are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors,  see  https://www.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                       ENDHOSTENT(3P)