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glibc/inet/ifaddrs.h
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/* ifaddrs.h -- declarations for getting network interface addresses | |
Copyright (C) 2002-2016 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, see | |
<http://www.gnu.org/licenses/>. */ | |
#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 */ |