mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-29 14:01:20 +00:00
75 lines
2.8 KiB
C
75 lines
2.8 KiB
C
|
/* ifaddrs.h -- declarations for getting network interface addresses
|
||
|
|
Copyright (C) 2002 Free Software Foundation, Inc.
|
||
|
|
This file is part of the GNU C Library.
|
||
|
|
|
||
|
|
The GNU C Library is free software; you can redistribute it and/or
|
||
|
|
modify it under the terms of the GNU Lesser General Public
|
||
|
|
License as published by the Free Software Foundation; either
|
||
|
|
version 2.1 of the License, or (at your option) any later version.
|
||
|
|
|
||
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
||
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
Lesser General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Lesser General Public
|
||
|
|
License along with the GNU C Library; if not, write to the Free
|
||
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||
|
|
02111-1307 USA. */
|
||
|
|
|
||
|
|
#ifndef _IFADDRS_H
|
||
|
|
#define _IFADDRS_H 1
|
||
|
|
|
||
|
|
#include <features.h>
|
||
|
|
#include <sys/socket.h>
|
||
|
|
|
||
|
|
__BEGIN_DECLS
|
||
|
|
|
||
|
|
/* The `getifaddrs' function generates a linked list of these structures.
|
||
|
|
Each element of the list describes one network interface. */
|
||
|
|
struct ifaddrs
|
||
|
|
{
|
||
|
|
struct ifaddrs *ifa_next; /* Pointer to the next structure. */
|
||
|
|
|
||
|
|
char *ifa_name; /* Name of this network interface. */
|
||
|
|
unsigned int ifa_flags; /* Flags as from SIOCGIFFLAGS ioctl. */
|
||
|
|
|
||
|
|
struct sockaddr *ifa_addr; /* Network address of this interface. */
|
||
|
|
struct sockaddr *ifa_netmask; /* Netmask of this interface. */
|
||
|
|
union
|
||
|
|
{
|
||
|
|
/* At most one of the following two is valid. If the IFF_BROADCAST
|
||
|
|
bit is set in `ifa_flags', then `ifa_broadaddr' is valid. If the
|
||
|
|
IFF_POINTOPOINT bit is set, then `ifa_dstaddr' is valid.
|
||
|
|
It is never the case that both these bits are set at once. */
|
||
|
|
struct sockaddr *ifu_broadaddr; /* Broadcast address of this interface. */
|
||
|
|
struct sockaddr *ifu_dstaddr; /* Point-to-point destination address. */
|
||
|
|
} ifa_ifu;
|
||
|
|
/* These very same macros are defined by <net/if.h> for `struct ifaddr'.
|
||
|
|
So if they are defined already, the existing definitions will be fine. */
|
||
|
|
# ifndef ifa_broadaddr
|
||
|
|
# define ifa_broadaddr ifa_ifu.ifu_broadaddr
|
||
|
|
# endif
|
||
|
|
# ifndef ifa_dstaddr
|
||
|
|
# define ifa_dstaddr ifa_ifu.ifu_dstaddr
|
||
|
|
# endif
|
||
|
|
|
||
|
|
void *ifa_data; /* Address-specific data (may be unused). */
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
/* Create a linked list of `struct ifaddrs' structures, one for each
|
||
|
|
network interface on the host machine. If successful, store the
|
||
|
|
list in *IFAP and return 0. On errors, return -1 and set `errno'.
|
||
|
|
|
||
|
|
The storage returned in *IFAP is allocated dynamically and can
|
||
|
|
only be properly freed by passing it to `freeifaddrs'. */
|
||
|
|
extern int getifaddrs (struct ifaddrs **__ifap) __THROW;
|
||
|
|
|
||
|
|
/* Reclaim the storage allocated by a previous `getifaddrs' call. */
|
||
|
|
extern void freeifaddrs (struct ifaddrs *__ifa) __THROW;
|
||
|
|
|
||
|
|
__END_DECLS
|
||
|
|
|
||
|
|
#endif /* ifaddrs.h */
|