Added <ifaddrs.h> interface with functions `getifaddrs', `freeifaddrs'.

	This implementation supports only IPv4.
	* inet/ifaddrs.h: New file.
	* sysdeps/generic/ifaddrs.c: New file.
	* sysdeps/gnu/ifaddrs.c: New file.
	* inet/test-ifaddrs.c: New file.
	* inet/Makefile (routines): Add ifaddrs.
	(headers): Add ifaddrs.h here.
	(tests): Add test-ifaddrs.
	* inet/Versions (GLIBC_2.3): New set, add getifaddrs and freeifaddrs.

	* resolv/res_hconf.c (_res_hconf_reorder_addrs): Use an explicit
	socket call to get an AF_INET socket, instead of using __opensock.
	The SIOCGIFNETMASK ioctl will work only with a PF_INET socket.

	* sysdeps/generic/ifreq.h (__ifreq): Take third argument SOCKFD,
	if not -1 use it instead of calling __opensock.
	* sysdeps/unix/sysv/linux/ifreq.h (__ifreq): Likewise.
	* sysdeps/mach/hurd/ifreq.h (__ifreq): Take new argument and ignore it.
	* resolv/res_hconf.c (_res_hconf_reorder_addrs): Pass new argument.

	* sysdeps/mach/hurd/ifreq.h: New file.
	* sysdeps/generic/ifreq.h (__if_freereq): Take second argument NUM_IFS.
	* sysdeps/unix/sysv/linux/ifreq.h (__if_freereq): Likewise.
	* resolv/res_hconf.c (_res_hconf_reorder_addrs): Update caller.

1 files changed, 74 insertions, 0 deletions

diff --git a/sysdeps/mach/hurd/ifreq.h b/sysdeps/mach/hurd/ifreq.h
new file mode 100644
index 0000000000..737dee9285
--- /dev/null
+++ b/sysdeps/mach/hurd/ifreq.h
@@ -0,0 +1,74 @@
+/* Fetch the host's network interface list.  Hurd version.
+   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.  */
+
+#include <net/if.h>
+#include <hurd.h>
+#include <hurd/pfinet.h>
+#include <sys/socket.h>
+#include <sys/mman.h>
+
+
+static inline void
+__ifreq (struct ifreq **ifreqs, int *num_ifs, int sockfd)
+{
+  struct ifconf ifc;
+  file_t server;
+
+  server = _hurd_socket_server (PF_INET, 0);
+  if (server == MACH_PORT_NULL)
+    {
+    out:
+      *num_ifs = 0;
+      *ifreqs = NULL;
+    }
+  else
+    {
+      char *data = NULL;
+      size_t len = 0;
+      error_t err = __pfinet_siocgifconf (server, -1, &data, &len);
+      if (err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED)
+	{
+	  /* On the first use of the socket server during the operation,
+	     allow for the old server port dying.  */
+	  server = _hurd_socket_server (PF_INET, 1);
+	  if (server == MACH_PORT_NULL)
+	    goto out;
+	  err = __pfinet_siocgifconf (server, -1, ifreqs, &len);
+	}
+      if (err)
+	goto out;
+
+      if (len % sizeof (struct ifreq) != 0)
+	{
+	  munmap (data, len);
+	  errno = EGRATUITOUS;
+	  goto out;
+	}
+      *num_ifs = len / sizeof (struct ifreq);
+      *ifreqs = (struct ifreq *) data;
+    }
+
+}
+
+
+static inline void
+__if_freereq (struct ifreq *ifreqs, int num_ifs)
+{
+  munmap (ifreqs, num_ifs * sizeof (struct ifreq))
+}