| /* Copyright (C) 1999-2018 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <errno.h> |
| #include <time.h> |
| #include <sys/time.h> |
| #include <ldsodefs.h> |
| |
| |
| #if HP_TIMING_AVAIL && !defined HANDLED_CPUTIME |
| /* Clock frequency of the processor. We make it a 64-bit variable |
| because some jokers are already playing with processors with more |
| than 4GHz. */ |
| static hp_timing_t freq; |
| |
| |
| /* This function is defined in the thread library. */ |
| extern void __pthread_clock_settime (clockid_t clock_id, hp_timing_t offset) |
| __attribute__ ((__weak__)); |
| |
| |
| static int |
| hp_timing_settime (clockid_t clock_id, const struct timespec *tp) |
| { |
| hp_timing_t tsc; |
| hp_timing_t usertime; |
| |
| /* First thing is to get the current time. */ |
| HP_TIMING_NOW (tsc); |
| |
| if (__glibc_unlikely (freq == 0)) |
| { |
| /* This can only happen if we haven't initialized the `freq' |
| variable yet. Do this now. We don't have to protect this |
| code against multiple execution since all of them should lead |
| to the same result. */ |
| freq = __get_clockfreq (); |
| if (__glibc_unlikely (freq == 0)) |
| /* Something went wrong. */ |
| return -1; |
| } |
| |
| /* Convert the user-provided time into CPU ticks. */ |
| usertime = tp->tv_sec * freq + (tp->tv_nsec * freq) / 1000000000ull; |
| |
| /* Determine the offset and use it as the new base value. */ |
| if (clock_id == CLOCK_PROCESS_CPUTIME_ID |
| || __pthread_clock_settime == NULL) |
| GL(dl_cpuclock_offset) = tsc - usertime; |
| else |
| __pthread_clock_settime (clock_id, tsc - usertime); |
| |
| return 0; |
| } |
| #endif |
| |
| |
| /* Set CLOCK to value TP. */ |
| int |
| __clock_settime (clockid_t clock_id, const struct timespec *tp) |
| { |
| int retval; |
| |
| /* Make sure the time cvalue is OK. */ |
| if (tp->tv_nsec < 0 || tp->tv_nsec >= 1000000000) |
| { |
| __set_errno (EINVAL); |
| return -1; |
| } |
| |
| switch (clock_id) |
| { |
| #define HANDLE_REALTIME \ |
| do { \ |
| struct timeval tv; \ |
| TIMESPEC_TO_TIMEVAL (&tv, tp); \ |
| \ |
| retval = __settimeofday (&tv, NULL); \ |
| } while (0) |
| |
| #ifdef SYSDEP_SETTIME |
| SYSDEP_SETTIME; |
| #endif |
| |
| #ifndef HANDLED_REALTIME |
| case CLOCK_REALTIME: |
| HANDLE_REALTIME; |
| break; |
| #endif |
| |
| default: |
| #ifdef SYSDEP_SETTIME_CPU |
| SYSDEP_SETTIME_CPU; |
| #endif |
| #ifndef HANDLED_CPUTIME |
| # if HP_TIMING_AVAIL |
| if (CPUCLOCK_WHICH (clock_id) == CLOCK_PROCESS_CPUTIME_ID |
| || CPUCLOCK_WHICH (clock_id) == CLOCK_THREAD_CPUTIME_ID) |
| retval = hp_timing_settime (clock_id, tp); |
| else |
| # endif |
| { |
| __set_errno (EINVAL); |
| retval = -1; |
| } |
| #endif |
| break; |
| } |
| |
| return retval; |
| } |
| weak_alias (__clock_settime, clock_settime) |