endhostent(3p) — Linux manual page


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

PROLOG         top

       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         top

       endhostent, gethostent, sethostent — network host database functions

SYNOPSIS         top

       #include <netdb.h>

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

DESCRIPTION         top

       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(), 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         top

       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         top

       No errors are defined for endhostent(), gethostent(), and

       The following sections are informative.

EXAMPLES         top




RATIONALE         top




SEE ALSO         top


       The Base Definitions volume of POSIX.1‐2008, netdb.h(0p)

COPYRIGHT         top

       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 Electrical 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.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                 2013                      ENDHOSTENT(3P)

Pages that refer to this page: netdb.h(0p)endservent(3p)gethostent(3p)getservbyport(3p)getservent(3p)htonl(3p)htons(3p)inet_addr(3p)inet_ntoa(3p)ntohs(3p)sethostent(3p)