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01: /* ifaddrs.h -- declarations for getting network interface addresses
02:    Copyright (C) 2002 Free Software Foundation, Inc.
03:    This file is part of the GNU C Library.
04: 
05:    The GNU C Library is free software; you can redistribute it and/or
06:    modify it under the terms of the GNU Lesser General Public
07:    License as published by the Free Software Foundation; either
08:    version 2.1 of the License, or (at your option) any later version.
09: 
10:    The GNU C Library is distributed in the hope that it will be useful,
11:    but WITHOUT ANY WARRANTY; without even the implied warranty of
12:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13:    Lesser General Public License for more details.
14: 
15:    You should have received a copy of the GNU Lesser General Public
16:    License along with the GNU C Library; if not, write to the Free
17:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18:    02111-1307 USA.  */
19: 
20: #ifndef _IFADDRS_H
21: #define _IFADDRS_H      1
22: 
23: #include <features.h>
24: #include <sys/socket.h>
25: 
26: __BEGIN_DECLS
27: 
28: /* The `getifaddrs' function generates a linked list of these structures.
29:    Each element of the list describes one network interface.  */
30: struct ifaddrs
31: {
32:   struct ifaddrs *ifa_next;     /* Pointer to the next structure.  */
33: 
34:   char *ifa_name;               /* Name of this network interface.  */
35:   unsigned int ifa_flags;       /* Flags as from SIOCGIFFLAGS ioctl.  */
36: 
37:   struct sockaddr *ifa_addr;    /* Network address of this interface.  */
38:   struct sockaddr *ifa_netmask; /* Netmask of this interface.  */
39:   union
40:   {
41:     /* At most one of the following two is valid.  If the IFF_BROADCAST
42:        bit is set in `ifa_flags', then `ifa_broadaddr' is valid.  If the
43:        IFF_POINTOPOINT bit is set, then `ifa_dstaddr' is valid.
44:        It is never the case that both these bits are set at once.  */
45:     struct sockaddr *ifu_broadaddr; /* Broadcast address of this interface. */
46:     struct sockaddr *ifu_dstaddr; /* Point-to-point destination address.  */
47:   } ifa_ifu;
48:   /* These very same macros are defined by <net/if.h> for `struct ifaddr'.
49:      So if they are defined already, the existing definitions will be fine.  */
50: # ifndef ifa_broadaddr
51: #  define ifa_broadaddr ifa_ifu.ifu_broadaddr
52: # endif
53: # ifndef ifa_dstaddr
54: #  define ifa_dstaddr   ifa_ifu.ifu_dstaddr
55: # endif
56: 
57:   void *ifa_data;               /* Address-specific data (may be unused).  */
58: };
59: 
60: 
61: /* Create a linked list of `struct ifaddrs' structures, one for each
62:    network interface on the host machine.  If successful, store the
63:    list in *IFAP and return 0.  On errors, return -1 and set `errno'.
64: 
65:    The storage returned in *IFAP is allocated dynamically and can
66:    only be properly freed by passing it to `freeifaddrs'.  */
67: extern int getifaddrs (struct ifaddrs **__ifap) __THROW;
68: 
69: /* Reclaim the storage allocated by a previous `getifaddrs' call.  */
70: extern void freeifaddrs (struct ifaddrs *__ifa)  __THROW;
71: 
72: __END_DECLS
73: 
74: #endif /* ifaddrs.h */
75: 

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