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getnetbyname (3)
  • getnetbyname (3) ( Solaris man: Библиотечные вызовы )
  • >> getnetbyname (3) ( FreeBSD man: Библиотечные вызовы )
  • getnetbyname (3) ( Русские man: Библиотечные вызовы )
  • getnetbyname (3) ( Linux man: Библиотечные вызовы )
  • getnetbyname (3) ( POSIX man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

    
    
    getnetent
    
     
    getnetbyaddr
    
     
    getnetbyname
    
     
    setnetent
    
     
    endnetent
    
     - get network entry
    
     
    

    LIBRARY

    Lb libc
    
     
    

    SYNOPSIS

       #include <netdb.h>
    struct netent * getnetent (void);
    struct netent * getnetbyname (const char *name);
    struct netent * getnetbyaddr (uint32_t net int type);
    void setnetent (int stayopen);
    void endnetent (void);
     

    DESCRIPTION

    The getnetent (,);
    getnetbyname (,);
    and getnetbyaddr ();
    functions each return a pointer to an object with the following structure describing an internet network. This structure contains either the information obtained from the nameserver, named(8), broken-out fields of a line in the network data base /etc/networks or entries supplied by the yp(8) system. The order of the lookups is controlled by the `networks' entry in nsswitch.conf5.

    struct  netent {
            char            *n_name;        /* official name of net */
            char            **n_aliases;    /* alias list */
            int             n_addrtype;     /* net number type */
            uint32_t        n_net;          /* net number */
    };
    

    The members of this structure are:

    Fa n_name
    The official name of the network.
    Fa n_aliases
    A zero terminated list of alternate names for the network.
    Fa n_addrtype
    The type of the network number returned; currently only AF_INET.
    Fa n_net
    The network number. Network numbers are returned in machine byte order.

    The getnetent ();
    function reads the next line of the file, opening the file if necessary.

    The setnetent ();
    function opens and rewinds the file. If the Fa stayopen flag is non-zero, the net data base will not be closed after each call to getnetbyname ();
    or getnetbyaddr (.);

    The endnetent ();
    function closes the file.

    The getnetbyname ();
    function and getnetbyaddr ();
    sequentially search from the beginning of the file until a matching net name or net address and type is found, or until EOF is encountered. The Fa type argument must be AF_INET Network numbers are supplied in host order.  

    FILES

    /etc/networks
    /etc/nsswitch.conf
    /etc/resolv.conf

     

    DIAGNOSTICS

    Null pointer (0) returned on EOF or error.  

    SEE ALSO

    networks(5)

    RFC 1101  

    HISTORY

    The getnetent (,);
    getnetbyaddr (,);
    getnetbyname (,);
    setnetent (,);
    and endnetent ();
    functions appeared in BSD 4.2  

    BUGS

    The data space used by these functions is thread-specific; if future use requires the data, it should be copied before any subsequent calls to these functions overwrite it. Only Internet network numbers are currently understood. Expecting network numbers to fit in no more than 32 bits is probably naive.


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    FILES
    DIAGNOSTICS
    SEE ALSO
    HISTORY
    BUGS


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