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getifmaddrs (3)
  • >> getifmaddrs (3) ( FreeBSD man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

    
    
    getifmaddrs
    
     - get multicast group memberships
    
     
    

    SYNOPSIS

       #include <sys/types.h>
       #include <sys/socket.h>
       #include <ifaddrs.h>
    int getifmaddrs (struct ifmaddrs **ifmap);
    void freeifmaddrs (struct ifmaddrs *ifmp);
     

    DESCRIPTION

    The getifmaddrs ();
    function stores a reference to a linked list of the multicast memberships on the local machine in the memory referenced by Fa ifmap . The list consists of Vt ifmaddrs structures, as defined in the include file In ifaddrs.h . The Vt ifmaddrs structure contains at least the following entries:
        struct ifmaddrs   *ifma_next;     /* Pointer to next struct */
        struct sockaddr   *ifma_name;     /* Interface name (AF_LINK) */
        struct sockaddr   *ifma_addr;     /* Multicast address */
        struct sockaddr   *ifma_lladdr;   /* Link-layer translation, if any */
    

    The ifma_next field contains a pointer to the next structure on the list. This field is NULL in last structure on the list.

    The ifma_name field references an AF_LINK address structure, containing the name of the interface where the membership exists.

    The ifma_addr references the address that this membership is for.

    The ifma_lladdr field references a link-layer translation for the protocol-level address in ifma_addr if one is set, otherwise it is NULL

    The data returned by getifmaddrs ();
    is dynamically allocated and should be freed using freeifmaddrs ();
    when no longer needed.  

    RETURN VALUES

    Rv -std getifmaddrs  

    ERRORS

    The getifmaddrs ();
    may fail and set errno for any of the errors specified for the library routines malloc(3) or sysctl(3).  

    SEE ALSO

    sysctl(3), networking(4), ifconfig(8)  

    HISTORY

    The getifmaddrs ();
    function first appeared in Fx 5.2 .  

    BUGS

    If both    #include <net/if.h>
    and    #include <ifaddrs.h>
    are being included,    #include <net/if.h>
    must be included before In ifaddrs.h .


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    ERRORS
    SEE ALSO
    HISTORY
    BUGS


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