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+Date: Tue, 31 Oct 2006 12:37:08 -0500
+From: Daniel Jacobowitz <drow at false dot org>
+To: Mike Frysinger <vapier at gentoo dot org>
+Cc: libc-ports at sourceware dot org, Philip Balister <philip dot balister at gmail dot com>
+Subject: Re: Problem with glibc-2.5 on ARM
+Message-ID: <20061031173708.GJ20468@nevyn.them.org>
+References: <499146270610241149ibe030e0nd9d6b177a95b346e@mail.gmail.com> <499146270610241254u7cadf63ej2edf05cedbc5266f@mail.gmail.com> <20061024195837.GA20181@nevyn.them.org> <200610291954.27022.vapier@gentoo.org>
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+
+On Sun, Oct 29, 2006 at 07:54:25PM -0500, Mike Frysinger wrote:
+> On Tuesday 24 October 2006 15:58, Daniel Jacobowitz wrote:
+> > ARM is going to need a slightly different version of that file, I
+> > guess.
+>
+> would declaring req with attribute packed not help ?
+> -mike
+
+Nope. "struct rtgenmsg" would still have size 4.
+
+Philip, are you still at all interested in this for the old ABI?
+I don't have time to test this patch right now, but I think it
+will work.
+
+--
+Daniel Jacobowitz
+CodeSourcery
+
+2006-10-31 Daniel Jacobowitz <dan@codesourcery.com>
+
+ * sysdeps/unix/sysv/linux/arm/check_pf.c: New file.
+ * sysdeps/unix/sysv/linux/arm/eabi/check_pf.c: New file.
+
+Index: sysdeps/unix/sysv/linux/arm/check_pf.c
+===================================================================
+RCS file: sysdeps/unix/sysv/linux/arm/check_pf.c
+diff -N sysdeps/unix/sysv/linux/arm/check_pf.c
+--- /dev/null 1 Jan 1970 00:00:00 -0000
++++ sysdeps/unix/sysv/linux/arm/check_pf.c 31 Oct 2006 17:29:58 -0000
+@@ -0,0 +1,274 @@
++/* Determine protocol families for which interfaces exist. ARM Linux version.
++ Copyright (C) 2003, 2006 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 <assert.h>
++#include <errno.h>
++#include <ifaddrs.h>
++#include <netdb.h>
++#include <stddef.h>
++#include <string.h>
++#include <time.h>
++#include <unistd.h>
++#include <sys/socket.h>
++
++#include <asm/types.h>
++#include <linux/netlink.h>
++#include <linux/rtnetlink.h>
++
++#include <not-cancel.h>
++#include <kernel-features.h>
++
++
++#ifndef IFA_F_TEMPORARY
++# define IFA_F_TEMPORARY IFA_F_SECONDARY
++#endif
++#ifndef IFA_F_HOMEADDRESS
++# define IFA_F_HOMEADDRESS 0
++#endif
++
++
++static int
++make_request (int fd, pid_t pid, bool *seen_ipv4, bool *seen_ipv6,
++ struct in6addrinfo **in6ai, size_t *in6ailen)
++{
++ struct req
++ {
++ struct nlmsghdr nlh;
++ struct rtgenmsg g;
++ } req;
++ struct sockaddr_nl nladdr;
++
++ /* struct rtgenmsg consists of a single byte but the ARM ABI rounds
++ it up to a word. Clear the padding explicitly here. */
++ assert (sizeof (req.g) == 4);
++ memset (&req.g, '\0', sizeof (req.g));
++
++ req.nlh.nlmsg_len = sizeof (req);
++ req.nlh.nlmsg_type = RTM_GETADDR;
++ req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST;
++ req.nlh.nlmsg_pid = 0;
++ req.nlh.nlmsg_seq = time (NULL);
++ req.g.rtgen_family = AF_UNSPEC;
++
++ memset (&nladdr, '\0', sizeof (nladdr));
++ nladdr.nl_family = AF_NETLINK;
++
++ if (TEMP_FAILURE_RETRY (__sendto (fd, (void *) &req, sizeof (req), 0,
++ (struct sockaddr *) &nladdr,
++ sizeof (nladdr))) < 0)
++ return -1;
++
++ *seen_ipv4 = false;
++ *seen_ipv6 = false;
++
++ bool done = false;
++ char buf[4096];
++ struct iovec iov = { buf, sizeof (buf) };
++ struct in6ailist
++ {
++ struct in6addrinfo info;
++ struct in6ailist *next;
++ } *in6ailist = NULL;
++ size_t in6ailistlen = 0;
++
++ do
++ {
++ struct msghdr msg =
++ {
++ (void *) &nladdr, sizeof (nladdr),
++ &iov, 1,
++ NULL, 0,
++ 0
++ };
++
++ ssize_t read_len = TEMP_FAILURE_RETRY (__recvmsg (fd, &msg, 0));
++ if (read_len < 0)
++ return -1;
++
++ if (msg.msg_flags & MSG_TRUNC)
++ return -1;
++
++ struct nlmsghdr *nlmh;
++ for (nlmh = (struct nlmsghdr *) buf;
++ NLMSG_OK (nlmh, (size_t) read_len);
++ nlmh = (struct nlmsghdr *) NLMSG_NEXT (nlmh, read_len))
++ {
++ if (nladdr.nl_pid != 0 || (pid_t) nlmh->nlmsg_pid != pid
++ || nlmh->nlmsg_seq != req.nlh.nlmsg_seq)
++ continue;
++
++ if (nlmh->nlmsg_type == RTM_NEWADDR)
++ {
++ struct ifaddrmsg *ifam = (struct ifaddrmsg *) NLMSG_DATA (nlmh);
++
++ switch (ifam->ifa_family)
++ {
++ case AF_INET:
++ *seen_ipv4 = true;
++ break;
++ case AF_INET6:
++ *seen_ipv6 = true;
++
++ if (ifam->ifa_flags & (IFA_F_DEPRECATED
++ | IFA_F_TEMPORARY
++ | IFA_F_HOMEADDRESS))
++ {
++ struct rtattr *rta = IFA_RTA (ifam);
++ size_t len = (nlmh->nlmsg_len
++ - NLMSG_LENGTH (sizeof (*ifam)));
++ void *local = NULL;
++ void *address = NULL;
++ while (RTA_OK (rta, len))
++ {
++ switch (rta->rta_type)
++ {
++ case IFA_LOCAL:
++ local = RTA_DATA (rta);
++ break;
++
++ case IFA_ADDRESS:
++ address = RTA_DATA (rta);
++ break;
++ }
++
++ rta = RTA_NEXT (rta, len);
++ }
++
++ struct in6ailist *newp = alloca (sizeof (*newp));
++ newp->info.flags = (((ifam->ifa_flags & IFA_F_DEPRECATED)
++ ? in6ai_deprecated : 0)
++ | ((ifam->ifa_flags
++ & IFA_F_TEMPORARY)
++ ? in6ai_temporary : 0)
++ | ((ifam->ifa_flags
++ & IFA_F_HOMEADDRESS)
++ ? in6ai_homeaddress : 0));
++ memcpy (newp->info.addr, address ?: local,
++ sizeof (newp->info.addr));
++ newp->next = in6ailist;
++ in6ailist = newp;
++ ++in6ailistlen;
++ }
++ break;
++ default:
++ /* Ignore. */
++ break;
++ }
++ }
++ else if (nlmh->nlmsg_type == NLMSG_DONE)
++ /* We found the end, leave the loop. */
++ done = true;
++ }
++ }
++ while (! done);
++
++ close_not_cancel_no_status (fd);
++
++ if (in6ailist != NULL)
++ {
++ *in6ai = malloc (in6ailistlen * sizeof (**in6ai));
++ if (*in6ai == NULL)
++ return -1;
++
++ *in6ailen = in6ailistlen;
++
++ do
++ {
++ (*in6ai)[--in6ailistlen] = in6ailist->info;
++ in6ailist = in6ailist->next;
++ }
++ while (in6ailist != NULL);
++ }
++
++ return 0;
++}
++
++
++/* We don't know if we have NETLINK support compiled in in our
++ Kernel. */
++#if __ASSUME_NETLINK_SUPPORT == 0
++/* Define in ifaddrs.h. */
++extern int __no_netlink_support attribute_hidden;
++#else
++# define __no_netlink_support 0
++#endif
++
++
++void
++attribute_hidden
++__check_pf (bool *seen_ipv4, bool *seen_ipv6,
++ struct in6addrinfo **in6ai, size_t *in6ailen)
++{
++ *in6ai = NULL;
++ *in6ailen = 0;
++
++ if (! __no_netlink_support)
++ {
++ int fd = __socket (PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
++
++ struct sockaddr_nl nladdr;
++ memset (&nladdr, '\0', sizeof (nladdr));
++ nladdr.nl_family = AF_NETLINK;
++
++ socklen_t addr_len = sizeof (nladdr);
++
++ if (fd >= 0
++ && __bind (fd, (struct sockaddr *) &nladdr, sizeof (nladdr)) == 0
++ && __getsockname (fd, (struct sockaddr *) &nladdr, &addr_len) == 0
++ && make_request (fd, nladdr.nl_pid, seen_ipv4, seen_ipv6,
++ in6ai, in6ailen) == 0)
++ /* It worked. */
++ return;
++
++ if (fd >= 0)
++ __close (fd);
++
++#if __ASSUME_NETLINK_SUPPORT == 0
++ /* Remember that there is no netlink support. */
++ __no_netlink_support = 1;
++#else
++ /* We cannot determine what interfaces are available. Be
++ pessimistic. */
++ *seen_ipv4 = true;
++ *seen_ipv6 = true;
++#endif
++ }
++
++#if __ASSUME_NETLINK_SUPPORT == 0
++ /* No netlink. Get the interface list via getifaddrs. */
++ struct ifaddrs *ifa = NULL;
++ if (getifaddrs (&ifa) != 0)
++ {
++ /* We cannot determine what interfaces are available. Be
++ pessimistic. */
++ *seen_ipv4 = true;
++ *seen_ipv6 = true;
++ return;
++ }
++
++ struct ifaddrs *runp;
++ for (runp = ifa; runp != NULL; runp = runp->ifa_next)
++ if (runp->ifa_addr->sa_family == PF_INET)
++ *seen_ipv4 = true;
++ else if (runp->ifa_addr->sa_family == PF_INET6)
++ *seen_ipv6 = true;
++
++ (void) freeifaddrs (ifa);
++#endif
++}
+Index: sysdeps/unix/sysv/linux/arm/eabi/check_pf.c
+===================================================================
+RCS file: sysdeps/unix/sysv/linux/arm/eabi/check_pf.c
+diff -N sysdeps/unix/sysv/linux/arm/eabi/check_pf.c
+--- /dev/null 1 Jan 1970 00:00:00 -0000
++++ sysdeps/unix/sysv/linux/arm/eabi/check_pf.c 31 Oct 2006 17:29:58 -0000
+@@ -0,0 +1 @@
++#include <sysdeps/unix/sysv/linux/check_pf.c>
+