2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
167 lines
4.4 KiB
Groff
167 lines
4.4 KiB
Groff
.\" $NetBSD: getifaddrs.3,v 1.12 2010/03/22 19:30:54 joerg 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 April 21, 2009
|
|
.Dt GETIFADDRS 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm getifaddrs
|
|
.Nd get interface addresses
|
|
.Sh SYNOPSIS
|
|
.In sys/types.h
|
|
.In sys/socket.h
|
|
.In ifaddrs.h
|
|
.Ft int
|
|
.Fn getifaddrs "struct ifaddrs **ifap"
|
|
.Ft void
|
|
.Fn freeifaddrs "struct ifaddrs *ifp"
|
|
.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
|
|
.In 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
|
|
.Pp
|
|
The
|
|
.Li ifa_next
|
|
field contains a pointer to the next structure on the list.
|
|
This field is
|
|
.Dv NULL
|
|
in last structure on the list.
|
|
.Pp
|
|
The
|
|
.Li ifa_name
|
|
field contains the interface name.
|
|
.Pp
|
|
The
|
|
.Li ifa_flags
|
|
field contains the interface flags, as set by
|
|
.Xr ifconfig 8
|
|
utility.
|
|
.Pp
|
|
The
|
|
.Li ifa_addr
|
|
field references either the address of the interface or the link level
|
|
address of the interface, if one exists, otherwise it is
|
|
.Dv NULL .
|
|
(The
|
|
.Li sa_family
|
|
field of the
|
|
.Li ifa_addr
|
|
field should be consulted to determine the format of the
|
|
.Li ifa_addr
|
|
address.)
|
|
.Pp
|
|
The
|
|
.Li ifa_netmask
|
|
field references the netmask associated with
|
|
.Li ifa_addr ,
|
|
if one is set, otherwise it is
|
|
.Dv NULL .
|
|
.Pp
|
|
The
|
|
.Li ifa_broadaddr
|
|
field,
|
|
which should only be referenced for non-P2P interfaces,
|
|
references the broadcast address associated with
|
|
.Li ifa_addr ,
|
|
if one exists, otherwise it is
|
|
.Dv NULL .
|
|
.Pp
|
|
The
|
|
.Li ifa_dstaddr
|
|
field references the destination address on a P2P interface,
|
|
if one exists, otherwise it is
|
|
.Dv NULL .
|
|
.Pp
|
|
The
|
|
.Li ifa_data
|
|
field references address family specific data.
|
|
For
|
|
.Dv AF_LINK
|
|
addresses it contains a pointer to the
|
|
.Fa struct if_data
|
|
.Pq as defined in include file Aq Pa net/if.h
|
|
which contains various interface attributes and statistics.
|
|
For all other address families, it is
|
|
.Dv NULL .
|
|
.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
|
|
.Nm
|
|
implementation first appeared in
|
|
.Bsx .
|
|
.Sh BUGS
|
|
If both
|
|
.In net/if.h
|
|
and
|
|
.In ifaddrs.h
|
|
are being included,
|
|
.In net/if.h
|
|
.Em must
|
|
be included before
|
|
.In ifaddrs.h .
|