rt: cleanup and allow to build for linuxthreads

It seems there is no real dependency to NPTL for these clock_*
functions when UCLIBC_ADVANCED_REALTIME is enabled.

No regressions found.

Reported-by: Baruch Siach <baruch@tkos.co.il>

3 files changed, 12 insertions, 204 deletions

diff --git a/librt/Makefile.in b/librt/Makefile.in
index 3fdc98dc0..f3cc0655b 100644
--- a/librt/Makefile.in
+++ b/librt/Makefile.in
@@ -17,8 +17,6 @@ librt_filter_SRC :=
 ifeq ($(UCLIBC_HAS_THREADS_NATIVE),y)
 librt_filter_SRC += mq_notify.c timer_create.c timer_delete.c \
 	timer_getoverr.c timer_gettime.c timer_settime.c
-else
-librt_filter_SRC += clock_nanosleep.c clock_getcpuclockid.c clock_gettime.c
 endif
 
 librt_filter_SRC += $(if $(UCLIBC_HAS_ADVANCED_REALTIME),, \
diff --git a/librt/clock_gettime.c b/librt/clock_gettime.c
index d87b7e463..e65d39d44 100644
--- a/librt/clock_gettime.c
+++ b/librt/clock_gettime.c
@@ -16,176 +16,30 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <sysdep.h>
 #include <errno.h>
+#include <sysdep.h>
 #include <time.h>
+#include <sys/time.h>
 #include "kernel-posix-cpu-timers.h"
-#include <bits/kernel-features.h>
 
 
 #define SYSCALL_GETTIME \
   retval = INLINE_SYSCALL (clock_gettime, 2, clock_id, tp); \
   break
 
-#ifdef __ASSUME_POSIX_TIMERS
-
-/* This means the REALTIME and MONOTONIC clock are definitely
-   supported in the kernel.  */
-# define SYSDEP_GETTIME							      \
+/* The REALTIME and MONOTONIC clock are definitely supported in the kernel.  */
+#define SYSDEP_GETTIME							      \
   SYSDEP_GETTIME_CPUTIME						      \
   case CLOCK_REALTIME:							      \
   case CLOCK_MONOTONIC:							      \
     SYSCALL_GETTIME
 
-# define __libc_missing_posix_timers 0
-#elif defined __NR_clock_gettime
-/* Is the syscall known to exist?  */
-int __libc_missing_posix_timers attribute_hidden;
-
-static inline int
-maybe_syscall_gettime (clockid_t clock_id, struct timespec *tp)
-{
-  int e = EINVAL;
-
-  if (!__libc_missing_posix_timers)
-    {
-      INTERNAL_SYSCALL_DECL (err);
-      int r = INTERNAL_SYSCALL (clock_gettime, err, 2, clock_id, tp);
-      if (!INTERNAL_SYSCALL_ERROR_P (r, err))
-	return 0;
-
-      e = INTERNAL_SYSCALL_ERRNO (r, err);
-      if (e == ENOSYS)
-	{
-	  __libc_missing_posix_timers = 1;
-	  e = EINVAL;
-	}
-    }
-
-  return e;
-}
-
-/* The REALTIME and MONOTONIC clock might be available.  Try the
-   syscall first.  */
-# define SYSDEP_GETTIME							      \
-  SYSDEP_GETTIME_CPUTIME						      \
-  case CLOCK_REALTIME:							      \
-  case CLOCK_MONOTONIC:							      \
-    retval = maybe_syscall_gettime (clock_id, tp);			      \
-    if (retval == 0)							      \
-      break;								      \
-    /* Fallback code.  */						      \
-    if (retval == EINVAL && clock_id == CLOCK_REALTIME)			      \
-      retval = realtime_gettime (tp);					      \
-    else 								      \
-      {									      \
-	__set_errno (retval);						      \
-	retval = -1;							      \
-      }									      \
-    break;
-#endif
-
-#ifdef __NR_clock_gettime
 /* We handled the REALTIME clock here.  */
-# define HANDLED_REALTIME	1
-# define HANDLED_CPUTIME	1
-
-# if __ASSUME_POSIX_CPU_TIMERS > 0
-
-#  define SYSDEP_GETTIME_CPU SYSCALL_GETTIME
-#  define SYSDEP_GETTIME_CPUTIME	/* Default catches them too.  */
-
-# else
+#define HANDLED_REALTIME	1
+#define HANDLED_CPUTIME	1
 
-int __libc_missing_posix_cpu_timers attribute_hidden;
-
-static int
-maybe_syscall_gettime_cpu (clockid_t clock_id, struct timespec *tp)
-{
-  int e = EINVAL;
-
-  if (!__libc_missing_posix_cpu_timers)
-    {
-      INTERNAL_SYSCALL_DECL (err);
-      int r = INTERNAL_SYSCALL (clock_gettime, err, 2, clock_id, tp);
-      if (!INTERNAL_SYSCALL_ERROR_P (r, err))
-	return 0;
-
-      e = INTERNAL_SYSCALL_ERRNO (r, err);
-# ifndef __ASSUME_POSIX_TIMERS
-      if (e == ENOSYS)
-	{
-	  __libc_missing_posix_timers = 1;
-	  __libc_missing_posix_cpu_timers = 1;
-	  e = EINVAL;
-	}
-      else
-# endif
-	{
-	  if (e == EINVAL)
-	    {
-	      /* Check whether the kernel supports CPU clocks at all.
-		 If not, record it for the future.  */
-	      r = INTERNAL_SYSCALL (clock_getres, err, 2,
-				    MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED),
-				    NULL);
-	      if (INTERNAL_SYSCALL_ERROR_P (r, err))
-		__libc_missing_posix_cpu_timers = 1;
-	    }
-	}
-    }
-
-  return e;
-}
-
-#  define SYSDEP_GETTIME_CPU						      \
-  retval = maybe_syscall_gettime_cpu (clock_id, tp);			      \
-  if (retval == 0)							      \
-    break;								      \
-  if (retval != EINVAL || !__libc_missing_posix_cpu_timers)		      \
-    {									      \
-      __set_errno (retval);						      \
-      retval = -1;							      \
-      break;								      \
-    }									      \
-  retval = -1 /* Otherwise continue on to the HP_TIMING version.  */;
-
-static inline int
-maybe_syscall_gettime_cputime (clockid_t clock_id, struct timespec *tp)
-{
-  return maybe_syscall_gettime_cpu
-    (clock_id == CLOCK_THREAD_CPUTIME_ID
-     ? MAKE_THREAD_CPUCLOCK (0, CPUCLOCK_SCHED)
-     : MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED),
-     tp);
-}
-
-#  define SYSDEP_GETTIME_CPUTIME					      \
-    case CLOCK_PROCESS_CPUTIME_ID:					      \
-    case CLOCK_THREAD_CPUTIME_ID:					      \
-      retval = maybe_syscall_gettime_cputime (clock_id, tp);		      \
-      if (retval == 0)							      \
-	break;								      \
-      if (retval != EINVAL || !__libc_missing_posix_cpu_timers)		      \
-	{								      \
-	  __set_errno (retval);						      \
-	  retval = -1;							      \
-	  break;							      \
-	}								      \
-      retval = hp_timing_gettime (clock_id, tp);			      \
-      break;
-#  if !HP_TIMING_AVAIL
-#   define hp_timing_gettime(clock_id, tp) (__set_errno (EINVAL), -1)
-#  endif
-
-# endif
-#endif
-
-#include <errno.h>
-#include <stdint.h>
-#include <time.h>
-#include <sys/time.h>
-#include <ldsodefs.h>
+#define SYSDEP_GETTIME_CPU SYSCALL_GETTIME
+#define SYSDEP_GETTIME_CPUTIME	/* Default catches them too.  */
 
 static inline int
 realtime_gettime (struct timespec *tp)
@@ -198,7 +52,6 @@ realtime_gettime (struct timespec *tp)
   return retval;
 }
 
-librt_hidden_proto (clock_gettime)
 /* Get current value of CLOCK and store it in TP.  */
 int
 clock_gettime (clockid_t clock_id, struct timespec *tp)
@@ -232,4 +85,3 @@ clock_gettime (clockid_t clock_id, struct timespec *tp)
 
   return retval;
 }
-librt_hidden_def (clock_gettime)
diff --git a/librt/clock_nanosleep.c b/librt/clock_nanosleep.c
index 235e8b563..4cf1e06b4 100644
--- a/librt/clock_nanosleep.c
+++ b/librt/clock_nanosleep.c
@@ -1,5 +1,4 @@
-/* Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
+/* Copyright (C) 2003-2018 Free Software Foundation, Inc.
 
    The GNU C Library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
@@ -17,18 +16,17 @@
 
 #include <time.h>
 #include <errno.h>
+#include <cancel.h>
+#include <sys/syscall.h>
 
-#include <sysdep-cancel.h>
-#include <bits/kernel-features.h>
 #include "kernel-posix-cpu-timers.h"
 
 
-#ifdef __ASSUME_POSIX_TIMERS
 /* We can simply use the syscall.  The CPU clocks are not supported
    with this function.  */
 int
 clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req,
-		 struct timespec *rem)
+		   struct timespec *rem)
 {
   INTERNAL_SYSCALL_DECL (err);
   int r;
@@ -53,43 +51,3 @@ clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req,
   return (INTERNAL_SYSCALL_ERROR_P (r, err)
 	  ? INTERNAL_SYSCALL_ERRNO (r, err) : 0);
 }
-
-#else
-# ifdef __NR_clock_nanosleep
-/* Is the syscall known to exist?  */
-extern int __libc_missing_posix_timers attribute_hidden;
-
-/* The REALTIME and MONOTONIC clock might be available.  Try the
-   syscall first.  */
-#  define SYSDEP_NANOSLEEP \
-  if (!__libc_missing_posix_timers)					      \
-    {									      \
-      clockid_t syscall_clockid;					      \
-      INTERNAL_SYSCALL_DECL (err);					      \
-									      \
-      if (clock_id == CLOCK_THREAD_CPUTIME_ID)				      \
-	return EINVAL;							      \
-      if (clock_id == CLOCK_PROCESS_CPUTIME_ID)				      \
-	syscall_clockid = MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED);	      \
-      else								      \
-	syscall_clockid = clock_id;					      \
-									      \
-      int oldstate = LIBC_CANCEL_ASYNC ();				      \
-									      \
-      int r = INTERNAL_SYSCALL (clock_nanosleep, err, 4,		      \
-				syscall_clockid, flags, req, rem);	      \
-									      \
-      LIBC_CANCEL_RESET (oldstate);					      \
-									      \
-      if (!INTERNAL_SYSCALL_ERROR_P (r, err))				      \
-	return 0;							      \
-									      \
-      if (INTERNAL_SYSCALL_ERRNO (r, err) != ENOSYS)			      \
-	return INTERNAL_SYSCALL_ERRNO (r, err);				      \
-									      \
-      __libc_missing_posix_timers = 1;					      \
-    }
-# endif
-
-# include <sysdeps/unix/clock_nanosleep.c>
-#endif