kc3-lang/gnulib/lib/gettime.c

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• Hash : 88811b7d
  Author :
  Date : 2023-05-14T23:27:51
  

  timespec: fill in other members
  
  This problem was found when compiling GNU Emacs with
  --enable-gcc-warnings on a platform where tv_sec is 64 bits and
  tv_nsec is 32 bits, and struct timespec has padding.  GCC
  -Wuse-of-uninitialized-value complained when a struct timespec
  initialized only via assigning to tv_sec and tv_nsec was copied
  via assignment (this was in lib/timespec.h’s make_timespec).
  Although behavior is well-defined on this platform, the warning is
  annoying and the behavior might not be well-defined on theoretical
  platforms where struct timespec has other members.  To work around
  this, initialize all the struct’s members.
  * lib/getsockopt.c (rpl_getsockopt):
  * lib/gettime.c (gettime):
  * lib/gettimeofday.c (gettimeofday):
  * lib/glthread/thread.c (gl_thread_self):
  * lib/nanosleep.c (nanosleep):
  * lib/parse-datetime.y (digits_to_date_time, set_hhmmss)
  (signed_seconds, unsigned_seconds, yylex, parse_datetime_body):
  * lib/poll.c (poll):
  * lib/pselect.c (pselect):
  * lib/pthread-cond.c (endlessly, pthread_cond_timedwait):
  * lib/pthread-rwlock.c (pthread_rwlock_timedrdlock)
  (pthread_rwlock_timedwrlock):
  * lib/pthread_mutex_timedlock.c (pthread_mutex_timedlock):
  * lib/select.c (rpl_select):
  * lib/settime.c (settime):
  * lib/stat-time.h (get_stat_atime, get_stat_ctime)
  (get_stat_mtime, get_stat_birthtime):
  * lib/thrd.c (rpl_thrd_current):
  * lib/timespec.h (make_timespec):
  * lib/timespec_getres.c (timespec_getres):
  * lib/utimecmp.c (utimecmpat):
  * lib/utimens.c (fdutimens):
  When filling in a struct timespec or similar time-related structure
  that might be copied elsewhere, also assign to any storage other
  than tv_sec and tv_nsec, to avoid undefined behavior on (likely
  theoretical) platforms where struct timespec has other members,
  and also to avoid warnings from GCC and/or valgrind.
  

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• lib/gettime.c

• /* gettime -- get the system clock
  
     Copyright (C) 2002, 2004-2007, 2009-2023 Free Software Foundation, Inc.
  
     This file 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 3 of the
     License, or (at your option) any later version.
  
     This file 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 this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  /* Written by Paul Eggert.  */
  
  #include <config.h>
  
  #include "timespec.h"
  
  #include <sys/time.h>
  
  /* Get the system time into *TS.  */
  
  void
  gettime (struct timespec *ts)
  {
  #if defined CLOCK_REALTIME && HAVE_CLOCK_GETTIME
    clock_gettime (CLOCK_REALTIME, ts);
  #elif defined HAVE_TIMESPEC_GET
    timespec_get (ts, TIME_UTC);
  #else
    struct timeval tv;
    gettimeofday (&tv, NULL);
    *ts = (struct timespec) { .tv_sec  = tv.tv_sec,
                              .tv_nsec = tv.tv_usec * 1000 };
  #endif
  }
  
  /* Return the current system time as a struct timespec.  */
  
  struct timespec
  current_timespec (void)
  {
    struct timespec ts;
    gettime (&ts);
    return ts;
  }
  

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