ENDNETENT(P)						     POSIX Programmer's Manual						      ENDNETENT(P)

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	connection  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 structure, 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, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications 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 Standard, 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(P)