Fix nice getpriority, setpriority namespace (bug 18553).

nice (XPG3) calls getpriority and setpriority (in XPG4 but not XPG3,
i.e. UX-shaded in XPG4).  This patch fixes this by making those
functions into weak aliases of __* functions and calling the __*
versions as needed.

Tested for x86_64 and x86 (testsuite, and that disassembly of
installed shared libraries is unchanged by this patch).

This completes cleaning up the unsorted linknamespace test XFAILs.

	[BZ #18553]
	* resource/getpriority.c (getpriority): Rename to __getpriority
	and define as weak alias of __getpriority.
	* resource/setpriority.c (setpriority): Rename to __setpriority
	and define as weak alias of __setpriority.
	* sysdeps/mach/hurd/getpriority.c (getpriority): Rename to
	__getpriority and define as weak alias of __getpriority.
	* sysdeps/mach/hurd/setpriority.c (setpriority): Rename to
	__setpriority and define as weak alias of __setpriority.
	* sysdeps/unix/syscalls.list (getpriority): Use __getpriority as
	strong name.
	(setpriority): Use __setpriority as strong name.
	* sysdeps/unix/sysv/linux/getpriority.c (getpriority): Rename to
	__getpriority and define as weak alias of __getpriority.
	* include/sys/resource.h (__getpriority): Declare.  Use
	libc_hidden_proto.
	(__setpriority): Likewise.
	(getpriority): Don't use libc_hidden_proto.
	(setpriority): Likewise.
	* sysdeps/posix/nice.c (nice): Call __getpriority instead of
	getpriority.  Call __setpriority instead of setpriority.
	* conform/Makefile (test-xfail-XPG3/unistd.h/linknamespace):
	Remove variable.

1 files changed, 3 insertions, 2 deletions

diff --git a/resource/setpriority.c b/resource/setpriority.c
index 08b0a95ea9..91521bdbb9 100644
--- a/resource/setpriority.c
+++ b/resource/setpriority.c
@@ -21,7 +21,7 @@
 /* Set the priority of all processes specified by WHICH and WHO
    to PRIO.  Returns 0 on success, -1 on errors.  */
 int
-setpriority (which, who, prio)
+__setpriority (which, who, prio)
      enum __priority_which which;
      id_t who;
      int prio;
@@ -29,6 +29,7 @@ setpriority (which, who, prio)
   __set_errno (ENOSYS);
   return -1;
 }
-libc_hidden_def (setpriority)
+libc_hidden_def (__setpriority)
+weak_alias (__setpriority, setpriority)
 
 stub_warning (setpriority)