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ENDNETENT(3P)              POSIX Programmer's Manual             ENDNETENT(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
       endnetent, getnetbyaddr, getnetbyname, getnetent, setnetent - network database functions

SYNOPSIS
       #include <netdb.h>

       void endnetent(void);
       struct netent *getnetbyaddr(uint32_t net, int type);
       struct netent *getnetbyname(const char *name);
       struct netent *getnetent(void);
       void setnetent(int stayopen);


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

       The setnetent() function shall open and rewind the database.  If the stayopen argument is non-zero, the connec-
       tion  to  the  net  database shall not be closed after each call to getnetent() (either directly, or indirectly
       through one of the other getnet*() functions), and the implementation may maintain an open file  descriptor  to
       the database.

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

       The getnetbyaddr() function shall search the database from the beginning, and find the first  entry  for  which
       the address family specified by type matches the n_addrtype member and the network number net matches the n_net
       member, opening and closing a connection to the database as necessary.  The net argument shall be  the  network
       number in host byte order.

       The getnetbyname() function shall search the database from the beginning and find the first entry for which the
       network name specified by name matches the n_name member, opening and closing a connection to the  database  as
       necessary.

       The  getnetbyaddr(),  getnetbyname(),  and getnetent() functions shall each return a pointer to a netent struc-
       ture, the members of which shall contain the fields of an entry in the network database.

       The endnetent() function shall close 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, getnetbyaddr(), getnetbyname(), and getnetent() shall return a pointer to a netent
       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. Otherwise, a null pointer shall be returned.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       The  getnetbyaddr(), getnetbyname(), and getnetent() functions 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
       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                        ENDNETENT(3P)