2005-04-27 Roland McGrath <roland@redhat.com>

	* sysdeps/unix/sysv/linux/kernel-posix-cpu-timers.h: New file.
	* sysdeps/unix/sysv/linux/clock_getcpuclockid.c: New file.
	* sysdeps/unix/sysv/linux/ia64/clock_getcpuclockid.c
	(HAS_CPUCLOCK): New macro.
	(clock_getcpuclockid): Function removed.
	#include the new linux file to define it instead.
	* sysdeps/unix/clock_gettime.c [HP_TIMING_AVAIL] (hp_timing_gettime):
	New function, broken out of ...
	(clock_gettime) [HP_TIMING_AVAIL]: ... here.  Call it.
	(realtime_gettime): New function, broken out of ...
	(clock_gettime) [! HANDLED_REALTIME]: ... here.  Call it.
	(clock_gettime) [SYSDEP_GETTIME_CPU]: Use new macro in default case.
	* sysdeps/unix/sysv/linux/clock_gettime.c (SYSCALL_GETTIME): New macro.
	(SYSDEP_GETTIME_CPUTIME): New macro.
	(SYSDEP_GETTIME): Use both.
	[! __ASSUME_POSIX_TIMERS] (maybe_syscall_gettime): New function, broken
	out of ...
	(SYSDEP_GETTIME): ... here.  Use it.
	[__NR_clock_gettime] (HANDLED_CPUTIME): Define it.
	(SYSDEP_GETTIME_CPUTIME): New macro.  Handle CPU timers by trying
	kernel support and falling back to hp-timing code.
	* sysdeps/posix/clock_getres.c
	[HP_TIMING_AVAIL] (hp_timing_getres): New function, broken out of ...
	(clock_getres) [HP_TIMING_AVAIL]: ... here.  Call it.
	(realtime_getres): New function, broken out of ...
	(clock_getres) [! HANDLED_REALTIME]: ... here.  Call it.
	(clock_getres) [SYSDEP_GETRES_CPU]: Use new macro in default case.
	* sysdeps/unix/sysv/linux/clock_getres.c (SYSCALL_GETRES): New macro.
	(SYSDEP_GETRES_CPUTIME): New macro.
	(SYSDEP_GETRES): Use both.
	[! __ASSUME_POSIX_TIMERS] (maybe_syscall_getres): New function, broken
	out of ...
	(SYSDEP_GETRES): ... here.  Use it.
	[__NR_clock_getres] (HANDLED_CPUTIME): Define it.
	(SYSDEP_GETRES_CPUTIME): New macro.  Handle CPU timers by trying
	kernel support and falling back to hp-timing code.
	* sysdeps/unix/sysv/linux/clock_nanosleep.c: Handle
	CLOCK_PROCESS_CPUTIME_ID and CLOCK_PROCESS_THREAD_ID specially,
	translating to the kernel clockid_t for our own process/thread clock.

6 files changed, 427 insertions, 89 deletions

diff --git a/sysdeps/unix/sysv/linux/clock_getcpuclockid.c b/sysdeps/unix/sysv/linux/clock_getcpuclockid.c
new file mode 100644
index 0000000000..ac893c0a77
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/clock_getcpuclockid.c
@@ -0,0 +1,103 @@
+/* clock_getcpuclockid -- Get a clockid_t for process CPU time.  Linux version.
+   Copyright (C) 2004 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <errno.h>
+#include <time.h>
+#include <unistd.h>
+#include "kernel-features.h"
+#include "kernel-posix-cpu-timers.h"
+
+#ifndef HAS_CPUCLOCK
+# define HAS_CPUCLOCK 1
+#endif
+
+int
+clock_getcpuclockid (pid_t pid, clockid_t *clock_id)
+{
+#ifdef __NR_clock_getres
+  /* The clockid_t value is a simple computation from the PID.
+     But we do a clock_getres call to validate it.  */
+
+  const clockid_t pidclock = MAKE_PROCESS_CPUCLOCK (pid, CPUCLOCK_SCHED);
+
+# if !(__ASSUME_POSIX_CPU_TIMERS > 0)
+  extern int __libc_missing_posix_cpu_timers attribute_hidden;
+# if !(__ASSUME_POSIX_TIMERS > 0)
+  extern int __libc_missing_posix_timers attribute_hidden;
+  if (__libc_missing_posix_timers && !__libc_missing_posix_cpu_timers)
+    __libc_missing_posix_cpu_timers = 1;
+# endif
+  if (!__libc_missing_posix_cpu_timers)
+# endif
+    {
+      INTERNAL_SYSCALL_DECL (err);
+      int r = INTERNAL_SYSCALL (clock_getres, err, 2, pidclock, NULL);
+      if (!INTERNAL_SYSCALL_ERROR_P (r, err))
+	{
+	  *clock_id = pidclock;
+	  return 0;
+	}
+
+# if !(__ASSUME_POSIX_TIMERS > 0)
+      if (INTERNAL_SYSCALL_ERRNO (r, err) == ENOSYS)
+	{
+	  /* The kernel doesn't support these calls at all.  */
+	  __libc_missing_posix_timers = 1;
+	  __libc_missing_posix_cpu_timers = 1;
+	}
+      else
+# endif
+	if (INTERNAL_SYSCALL_ERRNO (r, err) == EINVAL)
+	  {
+# if !(__ASSUME_POSIX_CPU_TIMERS > 0)
+	    if (pidclock == MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED)
+		|| INTERNAL_SYSCALL_ERROR_P (INTERNAL_SYSCALL
+					     (clock_getres, err, 2,
+					      MAKE_PROCESS_CPUCLOCK
+					      (0, CPUCLOCK_SCHED), NULL),
+					     err))
+	      /* The kernel doesn't support these clocks at all.  */
+	      __libc_missing_posix_cpu_timers = 1;
+	    else
+# endif
+	      /* The clock_getres system call checked the PID for us.  */
+	      return ESRCH;
+	  }
+	else
+	  return INTERNAL_SYSCALL_ERRNO (r, err);
+    }
+# endif
+
+  /* We don't allow any process ID but our own.  */
+  if (pid != 0 && pid != getpid ())
+    return EPERM;
+
+#ifdef CLOCK_PROCESS_CPUTIME_ID
+  if (HAS_CPUCLOCK)
+    {
+      /* Store the number.  */
+      *clock_id = CLOCK_PROCESS_CPUTIME_ID;
+
+      return 0;
+    }
+#else
+  /* We don't have a timer for that.  */
+  return ENOENT;
+#endif
+}
diff --git a/sysdeps/unix/sysv/linux/clock_getres.c b/sysdeps/unix/sysv/linux/clock_getres.c
index 442fbd5705..610738f7bb 100644
--- a/sysdeps/unix/sysv/linux/clock_getres.c
+++ b/sysdeps/unix/sysv/linux/clock_getres.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 2003 Free Software Foundation, Inc.
+/* clock_getres -- Get the resolution of a POSIX clockid_t.  Linux version.
+   Copyright (C) 2003, 2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -17,60 +18,168 @@
    02111-1307 USA.  */
 
 #include <sysdep.h>
+#include <errno.h>
+#include "kernel-posix-cpu-timers.h"
 
 #include "kernel-features.h"
 
 
+#define SYSCALL_GETRES \
+  retval = INLINE_SYSCALL (clock_getres, 2, clock_id, res); \
+  break
+
 #ifdef __ASSUME_POSIX_TIMERS
+
 /* This means the REALTIME and MONOTONIC clock are definitely
    supported in the kernel.  */
-# define SYSDEP_GETRES \
+# define SYSDEP_GETRES							      \
+  SYSDEP_GETRES_CPUTIME							      \
   case CLOCK_REALTIME:							      \
   case CLOCK_MONOTONIC:							      \
-    retval = INLINE_SYSCALL (clock_getres, 2, clock_id, res);		      \
-    break
+    SYSCALL_GETRES
+
+# define __libc_missing_posix_timers 0
 #elif defined __NR_clock_getres
 /* Is the syscall known to exist?  */
 extern int __libc_missing_posix_timers attribute_hidden;
 
+static inline int
+maybe_syscall_getres (clockid_t clock_id, struct timespec *res)
+{
+  int e = EINVAL;
+
+  if (!__libc_missing_posix_timers)
+    {
+      INTERNAL_SYSCALL_DECL (err);
+      int r = INTERNAL_SYSCALL (clock_getres, err, 2, clock_id, res);
+      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_GETRES \
+# define SYSDEP_GETRES							      \
+  SYSDEP_GETRES_CPUTIME							      \
   case CLOCK_REALTIME:							      \
   case CLOCK_MONOTONIC:							      \
-    {									      \
-      int e = EINVAL;							      \
-									      \
-      if (!__libc_missing_posix_timers)					      \
-	{								      \
-	  INTERNAL_SYSCALL_DECL (err);					      \
-	  int r = INTERNAL_SYSCALL (clock_getres, err, 2, clock_id, res);     \
-	  if (!INTERNAL_SYSCALL_ERROR_P (r, err))			      \
-	    {								      \
-	      retval = 0;						      \
-	      break;							      \
-	    }								      \
-									      \
-	  e = INTERNAL_SYSCALL_ERRNO (r, err);				      \
-	  if (e == ENOSYS)						      \
-	    {								      \
-	      __libc_missing_posix_timers = 1;				      \
-	      e = EINVAL;						      \
-	    }								      \
-	}								      \
-									      \
-      /* Fallback code.  */						      \
-      if (e == EINVAL && clock_id == CLOCK_REALTIME)			      \
-	HANDLE_REALTIME;						      \
-      else								      \
-	__set_errno (e);						      \
-    }									      \
-    break
+    retval = maybe_syscall_getres (clock_id, res);			      \
+    if (retval == 0)							      \
+      break;								      \
+    /* Fallback code.  */						      \
+    if (retval == EINVAL && clock_id == CLOCK_REALTIME)			      \
+      retval = realtime_getres (res);					      \
+    else								      \
+      {									      \
+	__set_errno (retval);						      \
+	retval = -1;							      \
+      }									      \
+    break;
 #endif
 
 #ifdef __NR_clock_getres
 /* We handled the REALTIME clock here.  */
 # define HANDLED_REALTIME	1
+# define HANDLED_CPUTIME	1
+
+# if __ASSUME_POSIX_CPU_TIMERS > 0
+
+#  define SYSDEP_GETRES_CPU SYSCALL_GETRES
+#  define SYSDEP_GETRES_CPUTIME	/* Default catches them too.  */
+
+# else
+
+extern int __libc_missing_posix_cpu_timers attribute_hidden;
+
+static int
+maybe_syscall_getres_cpu (clockid_t clock_id, struct timespec *res)
+{
+  int e = EINVAL;
+
+  if (!__libc_missing_posix_cpu_timers)
+    {
+      INTERNAL_SYSCALL_DECL (err);
+      int r = INTERNAL_SYSCALL (clock_getres, err, 2, clock_id, res);
+      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_GETRES_CPU						      \
+  retval = maybe_syscall_getres_cpu (clock_id, res);			      \
+  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_getres_cputime (clockid_t clock_id, struct timespec *res)
+{
+  return maybe_syscall_getres_cpu
+    (clock_id == CLOCK_THREAD_CPUTIME_ID
+     ? MAKE_THREAD_CPUCLOCK (0, CPUCLOCK_SCHED)
+     : MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED),
+     res);
+}
+
+#  define SYSDEP_GETRES_CPUTIME						      \
+    case CLOCK_PROCESS_CPUTIME_ID:					      \
+    case CLOCK_THREAD_CPUTIME_ID:					      \
+      retval = maybe_syscall_getres_cputime (clock_id, res);		      \
+      if (retval == 0)							      \
+	break;								      \
+      if (retval != EINVAL || !__libc_missing_posix_cpu_timers)		      \
+	{								      \
+	  __set_errno (retval);						      \
+	  retval = -1;							      \
+	  break;							      \
+	}								      \
+      retval = hp_timing_getres (res);					      \
+      break;
+#  if !HP_TIMING_AVAIL
+#   define hp_timing_getres(res) (__set_errno (EINVAL), -1)
+#  endif
+
+# endif
 #endif
 
 #include <sysdeps/posix/clock_getres.c>
diff --git a/sysdeps/unix/sysv/linux/clock_gettime.c b/sysdeps/unix/sysv/linux/clock_gettime.c
index 522fac32a7..41fbbde1cc 100644
--- a/sysdeps/unix/sysv/linux/clock_gettime.c
+++ b/sysdeps/unix/sysv/linux/clock_gettime.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 2003 Free Software Foundation, Inc.
+/* clock_gettime -- Get current time from a POSIX clockid_t.  Linux version.
+   Copyright (C) 2003, 2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -17,60 +18,167 @@
    02111-1307 USA.  */
 
 #include <sysdep.h>
-
+#include <errno.h>
+#include "kernel-posix-cpu-timers.h"
 #include "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 \
+# define SYSDEP_GETTIME							      \
+  SYSDEP_GETTIME_CPUTIME						      \
   case CLOCK_REALTIME:							      \
   case CLOCK_MONOTONIC:							      \
-    retval = INLINE_SYSCALL (clock_gettime, 2, clock_id, tp);		      \
-    break
+    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 \
+# define SYSDEP_GETTIME							      \
+  SYSDEP_GETTIME_CPUTIME						      \
   case CLOCK_REALTIME:							      \
   case CLOCK_MONOTONIC:							      \
-    {									      \
-      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))			      \
-	    {								      \
-	      retval = 0;						      \
-	      break;							      \
-	    }								      \
-									      \
-	  e = INTERNAL_SYSCALL_ERRNO (r, err);				      \
-	  if (e == ENOSYS)						      \
-	    {								      \
-	      __libc_missing_posix_timers = 1;				      \
-	      e = EINVAL;						      \
-	    }								      \
-	}								      \
-									      \
-      /* Fallback code.  */						      \
-      if (e == EINVAL && clock_id == CLOCK_REALTIME)			      \
-	HANDLE_REALTIME;						      \
-      else								      \
-	__set_errno (e);						      \
-    }									      \
-    break
+    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
+
+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 <sysdeps/unix/clock_gettime.c>
diff --git a/sysdeps/unix/sysv/linux/clock_nanosleep.c b/sysdeps/unix/sysv/linux/clock_nanosleep.c
index 2a3dd411a1..3fb14b48aa 100644
--- a/sysdeps/unix/sysv/linux/clock_nanosleep.c
+++ b/sysdeps/unix/sysv/linux/clock_nanosleep.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2003 Free Software Foundation, Inc.
+/* Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -17,9 +17,11 @@
    02111-1307 USA.  */
 
 #include <time.h>
+#include <errno.h>
 
 #include <sysdep-cancel.h>
 #include "kernel-features.h"
+#include "kernel-posix-cpu-timers.h"
 
 
 #ifdef __ASSUME_POSIX_TIMERS
@@ -32,6 +34,11 @@ clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req,
   INTERNAL_SYSCALL_DECL (err);
   int r;
 
+  if (clock_id == CLOCK_THREAD_CPUTIME_ID)
+    return EINVAL;
+  if (clock_id == CLOCK_PROCESS_CPUTIME_ID)
+    clock_id = MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED);
+
   if (SINGLE_THREAD_P)
     r = INTERNAL_SYSCALL (clock_nanosleep, err, 4, clock_id, flags, req, rem);
   else
@@ -58,12 +65,20 @@ extern int __libc_missing_posix_timers attribute_hidden;
 #  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, clock_id, flags,     \
-				req, rem);				      \
+      int r = INTERNAL_SYSCALL (clock_nanosleep, err, 4,		      \
+				syscall_clockid, flags, req, rem);	      \
 									      \
       LIBC_CANCEL_RESET (oldstate);					      \
 									      \
diff --git a/sysdeps/unix/sysv/linux/ia64/clock_getcpuclockid.c b/sysdeps/unix/sysv/linux/ia64/clock_getcpuclockid.c
index d2c45a560a..2f39851535 100644
--- a/sysdeps/unix/sysv/linux/ia64/clock_getcpuclockid.c
+++ b/sysdeps/unix/sysv/linux/ia64/clock_getcpuclockid.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 2000, 2001, 2003, 2004 Free Software Foundation, Inc.
+/* clock_getcpuclockid -- Get a clockid_t for process CPU time.  Linux/IA64
+   Copyright (C) 2000,2001,2003,2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -26,22 +27,6 @@
 
 #include "has_cpuclock.c"
 
+#define HAS_CPUCLOCK (has_cpuclock () > 0)
 
-int
-clock_getcpuclockid (pid_t pid, clockid_t *clock_id)
-{
-  /* We don't allow any process ID but our own.  */
-  if (pid != 0 && pid != getpid ())
-    return EPERM;
-
-  int retval = ENOENT;
-
-  if (has_cpuclock () > 0)
-    {
-      /* Store the number.  */
-      *clock_id = CLOCK_PROCESS_CPUTIME_ID;
-      retval = 0;
-    }
-
-  return retval;
-}
+#include <sysdeps/unix/sysv/linux/clock_getcpuclockid.c>
diff --git a/sysdeps/unix/sysv/linux/kernel-posix-cpu-timers.h b/sysdeps/unix/sysv/linux/kernel-posix-cpu-timers.h
new file mode 100644
index 0000000000..164a90ddeb
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/kernel-posix-cpu-timers.h
@@ -0,0 +1,18 @@
+/* Parameters for the Linux kernel ABI for CPU clocks.  */
+
+#define CPUCLOCK_PID(clock)		((pid_t) ~((clock) >> 3))
+#define CPUCLOCK_PERTHREAD(clock) \
+	(((clock) & (clockid_t) CPUCLOCK_PERTHREAD_MASK) != 0)
+#define CPUCLOCK_PID_MASK	7
+#define CPUCLOCK_PERTHREAD_MASK	4
+#define CPUCLOCK_WHICH(clock)	((clock) & (clockid_t) CPUCLOCK_CLOCK_MASK)
+#define CPUCLOCK_CLOCK_MASK	3
+#define CPUCLOCK_PROF		0
+#define CPUCLOCK_VIRT		1
+#define CPUCLOCK_SCHED		2
+#define CPUCLOCK_MAX		3
+
+#define MAKE_PROCESS_CPUCLOCK(pid, clock) \
+	((~(clockid_t) (pid) << 3) | (clockid_t) (clock))
+#define MAKE_THREAD_CPUCLOCK(tid, clock) \
+	MAKE_PROCESS_CPUCLOCK((tid), (clock) | CPUCLOCK_PERTHREAD_MASK)