Fix getifaddrs, freeifaddrs namespace (bug 17668).

Various objects in glibc bring in ifaddrs.o (via references to
__netlink_*) and thereby getifaddrs and freeifaddrs, which are not
part of any standard supported by glibc.  These should be weak aliases
of __getifaddrs and __freeifaddrs; this patch makes them so.

(The path by which these functions are brought in is Linux-specific,
but it seems less confusing to make all versions of these functions
weak aliases rather than only the Linux-specific versions that
definitely need it.)

Tested for x86_64 (testsuite, and that disassembly of installed shared
libraries is unchanged by this patch).

	[BZ #17668]
	* inet/ifaddrs.c (getifaddrs): Rename to __getifaddrs and define
	as weak alias of __getifaddrs.  Use libc_hidden_weak.
	(freeifaddrs): Rename to __freeifaddrs and define as weak alias of
	__freeifaddrs.  Use libc_hidden_weak.
	* sysdeps/gnu/ifaddrs.c (getifaddrs): Rename to __getifaddrs and
	define as weak alias of __getifaddrs.  Use libc_hidden_weak.
	(freeifaddrs): Rename to __freeifaddrs and define as weak alias of
	__freeifaddrs.  Use libc_hidden_weak.
	* sysdeps/unix/sysv/linux/ifaddrs.c (getifaddrs): Rename to
	__getifaddrs and define as weak alias of __getifaddrs.  Use
	libc_hidden_weak.
	(freeifaddrs): Rename to __freeifaddrs and define as weak alias of
	__freeifaddrs.  Use libc_hidden_weak.
	* conform/Makefile (test-xfail-XOPEN2K/net/if.h/linknamespace):
	Remove variable.
	(test-xfail-POSIX2008/net/if.h/linknamespace): Likewise.
	(test-xfail-XOPEN2K8/net/if.h/linknamespace): Likewise.

1 files changed, 6 insertions, 4 deletions

diff --git a/sysdeps/gnu/ifaddrs.c b/sysdeps/gnu/ifaddrs.c
index 1b8775f013..3607b2c8bd 100644
--- a/sysdeps/gnu/ifaddrs.c
+++ b/sysdeps/gnu/ifaddrs.c
@@ -32,7 +32,7 @@
    network interface on the host machine.  If successful, store the
    list in *IFAP and return 0.  On errors, return -1 and set `errno'.  */
 int
-getifaddrs (struct ifaddrs **ifap)
+__getifaddrs (struct ifaddrs **ifap)
 {
   /* This implementation handles only IPv4 interfaces.
      The various ioctls below will only work on an AF_INET socket.
@@ -150,13 +150,15 @@ getifaddrs (struct ifaddrs **ifap)
 
   return 0;
 }
+weak_alias (__getifaddrs, getifaddrs)
 #ifndef getifaddrs
-libc_hidden_def (getifaddrs)
+libc_hidden_weak (getifaddrs)
 #endif
 
 void
-freeifaddrs (struct ifaddrs *ifa)
+__freeifaddrs (struct ifaddrs *ifa)
 {
   free (ifa);
 }
-libc_hidden_def (freeifaddrs)
+weak_alias (__freeifaddrs, freeifaddrs)
+libc_hidden_weak (freeifaddrs)