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.

2 files changed, 6 insertions, 4 deletions

diff --git a/sysdeps/mach/hurd/getpriority.c b/sysdeps/mach/hurd/getpriority.c
index bb81ee69ef..73c7ad38c8 100644
--- a/sysdeps/mach/hurd/getpriority.c
+++ b/sysdeps/mach/hurd/getpriority.c
@@ -24,7 +24,7 @@
    or user (as specified by WHO) is used.  A lower priority number means higher
    priority.  Priorities range from PRIO_MIN to PRIO_MAX.  */
 int
-getpriority (enum __priority_which which, id_t who)
+__getpriority (enum __priority_which which, id_t who)
 {
   error_t err, onerr;
   int maxpri = INT_MIN;
@@ -81,4 +81,5 @@ getpriority (enum __priority_which which, id_t who)
 
   return MACH_PRIORITY_TO_NICE (maxpri);
 }
-libc_hidden_def (getpriority)
+libc_hidden_def (__getpriority)
+weak_alias (__getpriority, getpriority)
diff --git a/sysdeps/mach/hurd/setpriority.c b/sysdeps/mach/hurd/setpriority.c
index 43b8877fa0..41d7aa41fe 100644
--- a/sysdeps/mach/hurd/setpriority.c
+++ b/sysdeps/mach/hurd/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 (enum __priority_which which, id_t who, int prio)
+__setpriority (enum __priority_which which, id_t who, int prio)
 {
   error_t err;
   error_t pidloser, priloser;
@@ -94,4 +94,5 @@ setpriority (enum __priority_which which, id_t who, int prio)
 
   return err ? __hurd_fail (err) : 0;
 }
-libc_hidden_def (setpriority)
+libc_hidden_def (__setpriority)
+weak_alias (__setpriority, setpriority)