PKGBUILDs/core/glibc/glibc-2.15-revert-netlink-cache.patch

From 2a3a38c03b6e376a9bc8a1937641e5dee979bcbf Mon Sep 17 00:00:00 2001
From: Allan McRae <allan@archlinux.org>
Date: Sat, 4 Feb 2012 15:28:54 +1000
Subject: [PATCH] revert stuff

---
 include/ifaddrs.h                  |    5 -
 inet/check_pf.c                    |   18 +----
 nscd/connections.c                 |  119 ------------------------
 nscd/nscd-client.h                 |   18 +----
 nscd/nscd_gethst_r.c               |   23 +-----
 nscd/nscd_helper.c                 |   10 +-
 sysdeps/posix/getaddrinfo.c        |   10 +-
 sysdeps/unix/sysv/linux/Makefile   |    2 +-
 sysdeps/unix/sysv/linux/check_pf.c |  176 +++++++-----------------------------
 9 files changed, 46 insertions(+), 335 deletions(-)

diff --git a/include/ifaddrs.h b/include/ifaddrs.h
index e1c6cac..50e4c48 100644
--- a/include/ifaddrs.h
+++ b/include/ifaddrs.h
@@ -21,13 +21,8 @@ struct in6addrinfo
 extern void __check_pf (bool *seen_ipv4, bool *seen_ipv6,
 			struct in6addrinfo **in6ai, size_t *in6ailen)
   attribute_hidden;
-extern void __free_in6ai (struct in6addrinfo *in6ai) attribute_hidden;
 extern void __check_native (uint32_t a1_index, int *a1_native,
 			    uint32_t a2_index, int *a2_native)
   attribute_hidden;
 
-#ifdef IS_IN_nscd
-extern uint32_t __bump_nl_timestamp (void) attribute_hidden;
-#endif
-
 #endif	/* ifaddrs.h */
diff --git a/inet/check_pf.c b/inet/check_pf.c
index 0fa34cc..b015432 100644
--- a/inet/check_pf.c
+++ b/inet/check_pf.c
@@ -1,5 +1,5 @@
 /* Determine protocol families for which interfaces exist.  Generic version.
-   Copyright (C) 2003, 2006, 2011 Free Software Foundation, Inc.
+   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
@@ -54,19 +54,3 @@ __check_pf (bool *seen_ipv4, bool *seen_ipv6,
 
   (void) freeifaddrs (ifa);
 }
-
-
-void
-__free_in6ai (struct in6addrinfo *in6ai)
-{
-  /* Nothing to do.  */
-}
-
-
-#ifdef IS_IN_nscd
-uint32_t
-__bump_nl_timestamp (void)
-{
-  return 0;
-}
-#endif
diff --git a/nscd/connections.c b/nscd/connections.c
index c741996..2b5c7ef 100644
--- a/nscd/connections.c
+++ b/nscd/connections.c
@@ -24,7 +24,6 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <grp.h>
-#include <ifaddrs.h>
 #include <libintl.h>
 #include <pthread.h>
 #include <pwd.h>
@@ -33,10 +32,6 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <arpa/inet.h>
-#ifdef HAVE_NETLINK
-# include <linux/netlink.h>
-# include <linux/rtnetlink.h>
-#endif
 #ifdef HAVE_EPOLL
 # include <sys/epoll.h>
 #endif
@@ -252,11 +247,6 @@ static int sock;
 int inotify_fd = -1;
 #endif
 
-#ifdef HAVE_NETLINK
-/* Descriptor for netlink status updates.  */
-static int nl_status_fd = -1;
-#endif
-
 #ifndef __ASSUME_SOCK_CLOEXEC
 /* Negative if SOCK_CLOEXEC is not supported, positive if it is, zero
    before be know the result.  */
@@ -913,65 +903,6 @@ cannot set socket to close on exec: %s; disabling paranoia mode"),
       exit (1);
     }
 
-#ifdef HAVE_NETLINK
-  if (dbs[hstdb].enabled)
-    {
-      /* Try to open netlink socket to monitor network setting changes.  */
-      nl_status_fd = socket (AF_NETLINK,
-			     SOCK_RAW | SOCK_CLOEXEC | SOCK_NONBLOCK,
-			     NETLINK_ROUTE);
-      if (nl_status_fd != -1)
-	{
-	  struct sockaddr_nl snl;
-	  memset (&snl, '\0', sizeof (snl));
-	  snl.nl_family = AF_NETLINK;
-	  /* XXX Is this the best set to use?  */
-	  snl.nl_groups = (RTMGRP_IPV4_IFADDR | RTMGRP_TC | RTMGRP_IPV4_MROUTE
-			   | RTMGRP_IPV4_ROUTE | RTMGRP_IPV4_RULE
-			   | RTMGRP_IPV6_IFADDR | RTMGRP_IPV6_MROUTE
-			   | RTMGRP_IPV6_ROUTE | RTMGRP_IPV6_IFINFO
-			   | RTMGRP_IPV6_PREFIX);
-
-	  if (bind (nl_status_fd, (struct sockaddr *) &snl, sizeof (snl)) != 0)
-	    {
-	      close (nl_status_fd);
-	      nl_status_fd = -1;
-	    }
-	  else
-	    {
-	      /* Start the timestamp process.  */
-	      dbs[hstdb].head->extra_data[NSCD_HST_IDX_CONF_TIMESTAMP]
-		= __bump_nl_timestamp ();
-
-# ifndef __ASSUME_SOCK_CLOEXEC
-	      if (have_sock_cloexec < 0)
-		{
-		  /* We don't want to get stuck on accept.  */
-		  int fl = fcntl (nl_status_fd, F_GETFL);
-		  if (fl == -1
-		      || fcntl (nl_status_fd, F_SETFL, fl | O_NONBLOCK) == -1)
-		    {
-		      dbg_log (_("\
-cannot change socket to nonblocking mode: %s"),
-			       strerror (errno));
-		      exit (1);
-		    }
-
-		  /* The descriptor needs to be closed on exec.  */
-		  if (paranoia
-		      && fcntl (nl_status_fd, F_SETFD, FD_CLOEXEC) == -1)
-		    {
-		      dbg_log (_("cannot set socket to close on exec: %s"),
-			       strerror (errno));
-		      exit (1);
-		    }
-		}
-# endif
-	    }
-	}
-    }
-#endif
-
   /* Change to unprivileged uid/gid/groups if specified in config file */
   if (server_user != NULL)
     finish_drop_privileges ();
@@ -1895,18 +1826,6 @@ main_loop_poll (void)
     }
 #endif
 
-#ifdef HAVE_NETLINK
-  size_t idx_nl_status_fd = 0;
-  if (nl_status_fd != -1)
-    {
-      idx_nl_status_fd = nused;
-      conns[nused].fd = nl_status_fd;
-      conns[nused].events = POLLRDNORM;
-      ++nused;
-      firstfree = nused;
-    }
-#endif
-
   while (1)
     {
       /* Wait for any event.  We wait at most a couple of seconds so
@@ -2049,20 +1968,6 @@ disabled inotify after read error %d"),
 	    }
 #endif
 
-#ifdef HAVE_NETLINK
-	  if (idx_nl_status_fd != 0 && conns[idx_nl_status_fd].revents != 0)
-	    {
-	      char buf[4096];
-	      /* Read all the data.  We do not interpret it here.  */
-	      while (TEMP_FAILURE_RETRY (read (nl_status_fd, buf,
-					       sizeof (buf))) != -1)
-		;
-
-	      dbs[hstdb].head->extra_data[NSCD_HST_IDX_CONF_TIMESTAMP]
-		= __bump_nl_timestamp ();
-	    }
-#endif
-
 	  for (size_t cnt = first; cnt < nused && n > 0; ++cnt)
 	    if (conns[cnt].revents != 0)
 	      {
@@ -2141,17 +2046,6 @@ main_loop_epoll (int efd)
     }
 # endif
 
-# ifdef HAVE_NETLINK
-  if (nl_status_fd != -1)
-    {
-      ev.events = EPOLLRDNORM;
-      ev.data.fd = nl_status_fd;
-      if (epoll_ctl (efd, EPOLL_CTL_ADD, nl_status_fd, &ev) == -1)
-	/* We cannot use epoll.  */
-	return;
-    }
-# endif
-
   while (1)
     {
       struct epoll_event revs[100];
@@ -2268,18 +2162,6 @@ main_loop_epoll (int efd)
 		}
 	  }
 # endif
-# ifdef HAVE_NETLINK
-	else if (revs[cnt].data.fd == nl_status_fd)
-	  {
-	    char buf[4096];
-	    /* Read all the data.  We do not interpret it here.  */
-	    while (TEMP_FAILURE_RETRY (read (nl_status_fd, buf,
-					     sizeof (buf))) != -1)
-	      ;
-
-	    __bump_nl_timestamp ();
-	  }
-# endif
 	else
 	  {
 	    /* Remove the descriptor from the epoll descriptor.  */
@@ -2303,7 +2185,6 @@ main_loop_epoll (int efd)
       time_t laststart = now - ACCEPT_TIMEOUT;
       assert (starttime[sock] == 0);
       assert (inotify_fd == -1 || starttime[inotify_fd] == 0);
-      assert (nl_status_fd == -1 || starttime[nl_status_fd] == 0);
       for (int cnt = highest; cnt > STDERR_FILENO; --cnt)
 	if (starttime[cnt] != 0 && starttime[cnt] < laststart)
 	  {
diff --git a/nscd/nscd-client.h b/nscd/nscd-client.h
index b5cd2d2..caad26a 100644
--- a/nscd/nscd-client.h
+++ b/nscd/nscd-client.h
@@ -260,17 +260,12 @@ struct hashentry
 
 
 /* Current persistent database version.  */
-#define DB_VERSION	2
+#define DB_VERSION	1
 
 /* Maximum time allowed between updates of the timestamp.  */
 #define MAPPING_TIMEOUT (5 * 60)
 
 
-/* Used indices for the EXTRA_DATA element of 'database_pers_head'.
-   Each database has its own indices.  */
-#define NSCD_HST_IDX_CONF_TIMESTAMP	0
-
-
 /* Header of persistent database file.  */
 struct database_pers_head
 {
@@ -279,8 +274,6 @@ struct database_pers_head
   volatile int32_t gc_cycle;
   volatile int32_t nscd_certainly_running;
   volatile nscd_time_t timestamp;
-  /* Room for extensions.  */
-  volatile uint32_t extra_data[4];
 
   nscd_ssize_t module;
   nscd_ssize_t data_size;
@@ -329,12 +322,6 @@ extern int __nscd_open_socket (const char *key, size_t keylen,
 			       request_type type, void *response,
 			       size_t responselen) attribute_hidden;
 
-/* Try to get a file descriptor for the shared meory segment
-   containing the database.  */
-extern struct mapped_database *__nscd_get_mapping (request_type type,
-						   const char *key,
-						   struct mapped_database **mappedp) attribute_hidden;
-
 /* Get reference of mapping.  */
 extern struct mapped_database *__nscd_get_map_ref (request_type type,
 						   const char *name,
@@ -384,7 +371,4 @@ extern ssize_t writeall (int fd, const void *buf, size_t len)
 extern ssize_t sendfileall (int tofd, int fromfd, off_t off, size_t len)
   attribute_hidden;
 
-/* Get netlink timestamp counter from mapped area or zero.  */
-extern uint32_t __nscd_get_nl_timestamp (void);
-
 #endif /* nscd.h */
diff --git a/nscd/nscd_gethst_r.c b/nscd/nscd_gethst_r.c
index 6ee142d..70631fa 100644
--- a/nscd/nscd_gethst_r.c
+++ b/nscd/nscd_gethst_r.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1998-2005, 2006, 2007, 2008, 2009, 2011
+/* Copyright (C) 1998-2005, 2006, 2007, 2008, 2009
    Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
@@ -98,27 +98,6 @@ libc_freeres_fn (hst_map_free)
 }
 
 
-uint32_t
-__nscd_get_nl_timestamp (void)
-{
-  if (__nss_not_use_nscd_hosts != 0)
-    return 0;
-
-  struct mapped_database *map = __hst_map_handle.mapped;
-
-  if (map == NULL
-      || (map != NO_MAPPING
-	  && map->head->nscd_certainly_running == 0
-	  && map->head->timestamp + MAPPING_TIMEOUT < time (NULL)))
-    map = __nscd_get_mapping (GETFDHST, "hosts", &__hst_map_handle.mapped);
-
-  if (map == NO_MAPPING)
-    return 0;
-
-  return map->head->extra_data[NSCD_HST_IDX_CONF_TIMESTAMP];
-}
-
-
 int __nss_have_localdomain attribute_hidden;
 
 static int
diff --git a/nscd/nscd_helper.c b/nscd/nscd_helper.c
index 365b599..fe63f9a 100644
--- a/nscd/nscd_helper.c
+++ b/nscd/nscd_helper.c
@@ -277,9 +277,9 @@ __nscd_unmap (struct mapped_database *mapped)
 
 /* Try to get a file descriptor for the shared meory segment
    containing the database.  */
-struct mapped_database *
-__nscd_get_mapping (request_type type, const char *key,
-		    struct mapped_database **mappedp)
+static struct mapped_database *
+get_mapping (request_type type, const char *key,
+	     struct mapped_database **mappedp)
 {
   struct mapped_database *result = NO_MAPPING;
 #ifdef SCM_RIGHTS
@@ -449,8 +449,8 @@ __nscd_get_map_ref (request_type type, const char *name,
 	  || (cur->head->nscd_certainly_running == 0
 	      && cur->head->timestamp + MAPPING_TIMEOUT < time (NULL))
 	  || cur->head->data_size > cur->datasize)
-	cur = __nscd_get_mapping (type, name,
-				  (struct mapped_database **) &mapptr->mapped);
+	cur = get_mapping (type, name,
+			   (struct mapped_database **) &mapptr->mapped);
 
       if (__builtin_expect (cur != NO_MAPPING, 1))
 	{
diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c
index 1a023f9..4979805 100644
--- a/sysdeps/posix/getaddrinfo.c
+++ b/sysdeps/posix/getaddrinfo.c
@@ -2386,7 +2386,7 @@ getaddrinfo (const char *name, const char *service,
 	       || (hints->ai_family == PF_INET6 && ! seen_ipv6))
 	{
 	  /* We cannot possibly return a valid answer.  */
-	  __free_in6ai (in6ai);
+	  free (in6ai);
 	  return EAI_NONAME;
 	}
     }
@@ -2400,7 +2400,7 @@ getaddrinfo (const char *name, const char *service,
 	{
 	  if (hints->ai_flags & AI_NUMERICSERV)
 	    {
-	      __free_in6ai (in6ai);
+	      free (in6ai);
 	      return EAI_NONAME;
 	    }
 
@@ -2422,7 +2422,7 @@ getaddrinfo (const char *name, const char *service,
       if (last_i != 0)
 	{
 	  freeaddrinfo (p);
-	  __free_in6ai (in6ai);
+	  free (in6ai);
 
 	  return -(last_i & GAIH_EAI);
 	}
@@ -2434,7 +2434,7 @@ getaddrinfo (const char *name, const char *service,
     }
   else
     {
-      __free_in6ai (in6ai);
+      free (in6ai);
       return EAI_FAMILY;
     }
 
@@ -2622,7 +2622,7 @@ getaddrinfo (const char *name, const char *service,
       p->ai_canonname = canonname;
     }
 
-  __free_in6ai (in6ai);
+  free (in6ai);
 
   if (p)
     {
diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index e684b16..c907af4 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -173,6 +173,6 @@ CFLAGS-mq_receive.c += -fexceptions
 endif
 
 ifeq ($(subdir),nscd)
-sysdep-CFLAGS += -DHAVE_EPOLL -DHAVE_SENDFILE -DHAVE_INOTIFY -DHAVE_NETLINK
+sysdep-CFLAGS += -DHAVE_EPOLL -DHAVE_SENDFILE -DHAVE_INOTIFY
 CFLAGS-gai.c += -DNEED_NETLINK
 endif
diff --git a/sysdeps/unix/sysv/linux/check_pf.c b/sysdeps/unix/sysv/linux/check_pf.c
index 0738a70..d5ad7ea 100644
--- a/sysdeps/unix/sysv/linux/check_pf.c
+++ b/sysdeps/unix/sysv/linux/check_pf.c
@@ -1,5 +1,5 @@
 /* Determine protocol families for which interfaces exist.  Linux version.
-   Copyright (C) 2003, 2006-2008, 2010, 2011 Free Software Foundation, Inc.
+   Copyright (C) 2003, 2006, 2007, 2008, 2010, 2011 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
@@ -33,9 +33,6 @@
 
 #include <not-cancel.h>
 #include <kernel-features.h>
-#include <bits/libc-lock.h>
-#include <atomic.h>
-#include <nscd/nscd-client.h>
 
 
 #ifndef IFA_F_HOMEADDRESS
@@ -46,42 +43,9 @@
 #endif
 
 
-struct cached_data
-{
-  uint32_t timestamp;
-  uint32_t usecnt;
-  bool seen_ipv4;
-  bool seen_ipv6;
-  size_t in6ailen;
-  struct in6addrinfo in6ai[0];
-};
-
-static struct cached_data noai6ai_cached =
-  {
-    .usecnt = 1,	/* Make sure we never try to delete this entry.  */
-    .in6ailen = 0
-  };
-
-static struct cached_data *cache;
-__libc_lock_define_initialized (static, lock);
-
-
-#ifdef IS_IN_nscd
-static uint32_t nl_timestamp;
-
-uint32_t
-__bump_nl_timestamp (void)
-{
-  if (atomic_increment_val (&nl_timestamp) == 0)
-    atomic_increment (&nl_timestamp);
-
-  return nl_timestamp;
-}
-#endif
-
-
-static struct cached_data *
-make_request (int fd, pid_t pid)
+static int
+make_request (int fd, pid_t pid, bool *seen_ipv4, bool *seen_ipv6,
+	      struct in6addrinfo **in6ai, size_t *in6ailen)
 {
   struct req
   {
@@ -135,6 +99,9 @@ make_request (int fd, pid_t pid)
 				    sizeof (nladdr))) < 0)
     goto out_fail;
 
+  *seen_ipv4 = false;
+  *seen_ipv6 = false;
+
   bool done = false;
   struct in6ailist
   {
@@ -142,8 +109,6 @@ make_request (int fd, pid_t pid)
     struct in6ailist *next;
   } *in6ailist = NULL;
   size_t in6ailistlen = 0;
-  bool seen_ipv4 = false;
-  bool seen_ipv6 = false;
 
   do
     {
@@ -207,12 +172,12 @@ make_request (int fd, pid_t pid)
 		    {
 		      if (*(const in_addr_t *) address
 			  != htonl (INADDR_LOOPBACK))
-			seen_ipv4 = true;
+			*seen_ipv4 = true;
 		    }
 		  else
 		    {
 		      if (!IN6_IS_ADDR_LOOPBACK (address))
-			seen_ipv6 = true;
+			*seen_ipv6 = true;
 		    }
 		}
 
@@ -246,47 +211,30 @@ make_request (int fd, pid_t pid)
     }
   while (! done);
 
-  struct cached_data *result;
-  if (seen_ipv6 && in6ailist != NULL)
+  if (*seen_ipv6 && in6ailist != NULL)
     {
-      result = malloc (sizeof (*result)
-		       + in6ailistlen * sizeof (struct in6addrinfo));
-      if (result == NULL)
+      *in6ai = malloc (in6ailistlen * sizeof (**in6ai));
+      if (*in6ai == NULL)
 	goto out_fail;
 
-#ifdef IS_IN_nscd
-      result->timestamp = nl_timestamp;
-#else
-      result->timestamp = __nscd_get_nl_timestamp ();
-#endif
-      result->usecnt = 2;
-      result->seen_ipv4 = seen_ipv4;
-      result->seen_ipv6 = true;
-      result->in6ailen = in6ailistlen;
+      *in6ailen = in6ailistlen;
 
       do
 	{
-	  result->in6ai[--in6ailistlen] = in6ailist->info;
+	  (*in6ai)[--in6ailistlen] = in6ailist->info;
 	  in6ailist = in6ailist->next;
 	}
       while (in6ailist != NULL);
     }
-  else
-    {
-      atomic_add (&noai6ai_cached.usecnt, 2);
-      noai6ai_cached.seen_ipv4 = seen_ipv4;
-      noai6ai_cached.seen_ipv6 = seen_ipv6;
-      result = &noai6ai_cached;
-    }
 
   if (use_malloc)
     free (buf);
-  return result;
+  return 0;
 
 out_fail:
   if (use_malloc)
     free (buf);
-  return NULL;
+  return -1;
 }
 
 
@@ -310,65 +258,28 @@ __check_pf (bool *seen_ipv4, bool *seen_ipv6,
 
   if (! __no_netlink_support)
     {
-      struct cached_data *olddata = NULL;
-      struct cached_data *data = NULL;
+      int fd = __socket (PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
 
-      __libc_lock_lock (lock);
-
-#ifdef IS_IN_nscd
-# define cache_valid() nl_timestamp != 0 && cache->timestamp == nl_timestamp
-#else
-# define cache_valid() \
-      ({ uint32_t val = __nscd_get_nl_timestamp ();			      \
-	 val != 0 && cache->timestamp == val; })
-#endif
-      if (cache != NULL && cache_valid ())
-	{
-	  data = cache;
-	  atomic_increment (&cache->usecnt);
-	}
-      else
+      if (__builtin_expect (fd >= 0, 1))
 	{
-	  int fd = __socket (PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
+	  struct sockaddr_nl nladdr;
+	  memset (&nladdr, '\0', sizeof (nladdr));
+	  nladdr.nl_family = AF_NETLINK;
 
-	  if (__builtin_expect (fd >= 0, 1))
-	    {
-	      struct sockaddr_nl nladdr;
-	      memset (&nladdr, '\0', sizeof (nladdr));
-	      nladdr.nl_family = AF_NETLINK;
-
-	      socklen_t addr_len = sizeof (nladdr);
-
-	      if(__bind (fd, (struct sockaddr *) &nladdr, sizeof (nladdr)) == 0
-		 && __getsockname (fd, (struct sockaddr *) &nladdr,
-				   &addr_len) == 0)
-		data = make_request (fd, nladdr.nl_pid);
-
-	      close_not_cancel_no_status (fd);
-	    }
-
-	  if (data != NULL)
-	    {
-	      olddata = cache;
-	      cache = data;
-	    }
-	}
+	  socklen_t addr_len = sizeof (nladdr);
 
-      __libc_lock_unlock (lock);
+	  bool success
+	    = (__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);
 
-      if (data != NULL)
-	{
-	  /* It worked.  */
-	  *seen_ipv4 = data->seen_ipv4;
-	  *seen_ipv6 = data->seen_ipv6;
-	  *in6ailen = data->in6ailen;
-	  *in6ai = data->in6ai;
-
-	  if (olddata != NULL && olddata->usecnt > 0
-	      && atomic_add_zero (&olddata->usecnt, -1))
-	    free (olddata);
+	  close_not_cancel_no_status (fd);
 
-	  return;
+	  if (success)
+	    /* It worked.  */
+	    return;
 	}
 
 #if __ASSUME_NETLINK_SUPPORT == 0
@@ -407,26 +318,3 @@ __check_pf (bool *seen_ipv4, bool *seen_ipv6,
   (void) freeifaddrs (ifa);
 #endif
 }
-
-
-void
-__free_in6ai (struct in6addrinfo *ai)
-{
-  if (ai != NULL)
-    {
-      struct cached_data *data =
-	(struct cached_data *) ((char *) ai
-				- offsetof (struct cached_data, in6ai));
-
-      if (atomic_add_zero (&data->usecnt, -1))
-	{
-	  __libc_lock_lock (lock);
-
-	  if (data->usecnt == 0)
-	    /* Still unused.  */
-	    free (data);
-
-	  __libc_lock_unlock (lock);
-	}
-    }
-}
-- 
1.7.9