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-.\"     $OpenBSD: getifaddrs.3,v 1.15 2012/07/13 09:32:23 krw Exp $
-.\"     BSDI    getifaddrs.3,v 2.5 2000/02/23 14:51:59 dab Exp
-.\"
-.\" Copyright (c) 1995, 1999
-.\"     Berkeley Software Design, Inc.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.Dd $Mdocdate: July 13 2012 $
-.Dt GETIFADDRS 3
-.Os
-.Sh NAME
-.Nm getifaddrs
-.Nd get interface addresses
-.Sh SYNOPSIS
-.Fd #include <sys/types.h>
-.Fd #include <sys/socket.h>
-.Fd #include <ifaddrs.h>
-.Ft int
-.Fn getifaddrs "struct ifaddrs **ifap"
-.Ft void
-.Fn freeifaddrs "struct ifaddrs *ifap"
-.Sh DESCRIPTION
-The
-.Fn getifaddrs
-function stores a reference to a linked list of the network interfaces
-on the local machine in the memory referenced by
-.Fa ifap .
-The list consists of
-.Nm ifaddrs
-structures, as defined in the include file
-.Aq Pa ifaddrs.h .
-The
-.Nm ifaddrs
-structure contains at least the following entries:
-.Bd -literal
-    struct ifaddrs   *ifa_next;         /* Pointer to next struct */
-    char             *ifa_name;         /* Interface name */
-    u_int             ifa_flags;        /* Interface flags */
-    struct sockaddr  *ifa_addr;         /* Interface address */
-    struct sockaddr  *ifa_netmask;      /* Interface netmask */
-    struct sockaddr  *ifa_broadaddr;    /* Interface broadcast address */
-    struct sockaddr  *ifa_dstaddr;      /* P2P interface destination */
-    void             *ifa_data;         /* Address specific data */
-.Ed
-.Bl -tag -width ifa_broadaddr
-.It Fa ifa_next
-Contains a pointer to the next structure on the list.
-This field is set to
-.Dv NULL
-in the last structure on the list.
-.It Fa ifa_name
-Contains the interface name.
-.It Fa ifa_flags
-Contains the interface flags, as set by
-.Xr ifconfig 8 .
-.It Fa ifa_addr
-References either the address of the interface or the link level
-address of the interface, if one exists, otherwise it is
-.Dv NULL .
-(The
-.Fa sa_family
-field of the
-.Fa ifa_addr
-field should be consulted to determine the format of the
-.Fa ifa_addr
-address.)
-.It Fa ifa_netmask
-References the netmask associated with
-.Fa ifa_addr ,
-if one is set, otherwise it is
-.Dv NULL .
-.It Fa ifa_broadaddr
-This field, which should only be referenced for non-P2P interfaces,
-references the broadcast address associated with
-.Fa ifa_addr ,
-if one exists, otherwise it is
-.Dv NULL .
-.It Fa ifa_dstaddr
-This field, which should only be referenced for P2P interfaces,
-references the destination address on a P2P interface,
-if one exists, otherwise it is
-.Dv NULL .
-.It Fa ifa_data
-References address family specific data.
-For
-.Dv AF_LINK
-addresses it contains a pointer to the
-.Li struct if_data
-(as defined in include file
-.Aq Pa net/if.h )
-which contains various interface attributes and statistics.
-For all other address families,
-.Fa ifa_data
-is
-.Dv NULL .
-.El
-.Pp
-The data returned by
-.Fn getifaddrs
-is dynamically allocated and should be freed using
-.Fn freeifaddrs
-when no longer needed.
-.Sh RETURN VALUES
-Upon successful completion, a value of 0 is returned.
-Otherwise, a value of \-1 is returned and
-.Va errno
-is set to indicate the error.
-.Sh ERRORS
-The
-.Fn getifaddrs
-may fail and set
-.Va errno
-for any of the errors specified for the library routines
-.Xr ioctl 2 ,
-.Xr socket 2 ,
-.Xr malloc 3 ,
-or
-.Xr sysctl 3 .
-.Sh SEE ALSO
-.Xr ioctl 2 ,
-.Xr socket 2 ,
-.Xr sysctl 3 ,
-.Xr networking 4 ,
-.Xr ifconfig 8
-.Sh HISTORY
-The
-.Fn getifaddrs
-function first appeared in BSDI BSD/OS.
-The function has been available on
-.Ox
-since
-.Ox 2.7 .
-.Sh BUGS
-If both
-.Aq Pa net/if.h
-and
-.Aq Pa ifaddrs.h
-are being included,
-.Aq Pa net/if.h
-.Em must
-be included before
-.Aq Pa ifaddrs.h .