diff options
Diffstat (limited to 'inet/ifaddrs.h')
-rw-r--r-- | inet/ifaddrs.h | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/inet/ifaddrs.h b/inet/ifaddrs.h new file mode 100644 index 0000000000..ba6a1554b1 --- /dev/null +++ b/inet/ifaddrs.h @@ -0,0 +1,74 @@ +/* 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 */ |