Проект OpenNet: MAN getifmaddrs (3) Библиотечные вызовы (FreeBSD и Linux)

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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).

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 .

Партнёры:

Хостинг:

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Created 1996-2024 by Maxim Chirkov
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