| /* clock_gettime -- Get current time from a POSIX clockid_t. Linux version. |
| Copyright (C) 2003,2004,2005,2006,2007,2010 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 <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 |
| |
| #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 \ |
| 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_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 \ |
| case CLOCK_REALTIME: \ |
| case CLOCK_MONOTONIC: \ |
| case CLOCK_MONOTONIC_RAW: \ |
| case CLOCK_REALTIME_COARSE: \ |
| case CLOCK_MONOTONIC_COARSE: \ |
| 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_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) |
| { |
| # ifdef HAVE_CLOCK_GETRES_VSYSCALL |
| /* 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); |
| # else |
| /* 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); |
| # endif |
| 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> |