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, 8 insertions, 2 deletions

diff --git a/include/sys/resource.h b/include/sys/resource.h
index 7622da969a..688c46c4ae 100644
--- a/include/sys/resource.h
+++ b/include/sys/resource.h
@@ -2,8 +2,14 @@
 #include <resource/sys/resource.h>
 
 #ifndef _ISOMAC
-libc_hidden_proto (getpriority)
-libc_hidden_proto (setpriority)
+/* Prototypes repeated instead of using __typeof because
+   sys/resource.h is included in C++ tests, and declaring functions
+   with __typeof and __THROW doesn't work for C++.  */
+extern int __getpriority (__priority_which_t __which, id_t __who) __THROW;
+libc_hidden_proto (__getpriority)
+extern int __setpriority (__priority_which_t __which, id_t __who, int __prio)
+     __THROW;
+libc_hidden_proto (__setpriority)
 libc_hidden_proto (getrlimit64)
 extern __typeof (getrlimit64) __getrlimit64;
 libc_hidden_proto (__getrlimit64);