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authorUlrich Drepper <drepper@redhat.com>2004-12-22 20:10:10 +0000
committerUlrich Drepper <drepper@redhat.com>2004-12-22 20:10:10 +0000
commita334319f6530564d22e775935d9c91663623a1b4 (patch)
treeb5877475619e4c938e98757d518bb1e9cbead751 /sysdeps/unix/sysv/linux/clock_gettime.c
parent0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (diff)
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(CFLAGS-tst-align.c): Add -mpreferred-stack-boundary=4.
Diffstat (limited to 'sysdeps/unix/sysv/linux/clock_gettime.c')
-rw-r--r--sysdeps/unix/sysv/linux/clock_gettime.c185
1 files changed, 34 insertions, 151 deletions
diff --git a/sysdeps/unix/sysv/linux/clock_gettime.c b/sysdeps/unix/sysv/linux/clock_gettime.c
index 5afe20feb5..522fac32a7 100644
--- a/sysdeps/unix/sysv/linux/clock_gettime.c
+++ b/sysdeps/unix/sysv/linux/clock_gettime.c
@@ -1,5 +1,4 @@
-/* clock_gettime -- Get current time from a POSIX clockid_t. Linux version.
- Copyright (C) 2003,2004,2005,2006 Free Software Foundation, Inc.
+/* Copyright (C) 2003 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
@@ -18,176 +17,60 @@
02111-1307 USA. */
#include <sysdep.h>
-#include <errno.h>
-#include <time.h>
-#include "kernel-posix-cpu-timers.h"
-#include <kernel-features.h>
-#ifndef HAVE_CLOCK_GETTIME_VSYSCALL
-# undef INTERNAL_VSYSCALL
-# define INTERNAL_VSYSCALL INTERNAL_SYSCALL
-# undef INLINE_VSYSCALL
-# define INLINE_VSYSCALL INLINE_SYSCALL
-#else
-# include <bits/libc-vdso.h>
-#endif
+#include "kernel-features.h"
-#define SYSCALL_GETTIME \
- retval = INLINE_VSYSCALL (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 \
- SYSDEP_GETTIME_CPUTIME \
+# define SYSDEP_GETTIME \
case CLOCK_REALTIME: \
case CLOCK_MONOTONIC: \
- SYSCALL_GETTIME
-
-# define __libc_missing_posix_timers 0
+ retval = INLINE_SYSCALL (clock_gettime, 2, clock_id, tp); \
+ break
#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_VSYSCALL (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 \
+# define SYSDEP_GETTIME \
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;
+ { \
+ 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
#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_VSYSCALL (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_VSYSCALL (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>