diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/clock_gettime.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/clock_gettime.c | 185 |
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> |