u-tools/apps/tar/gnu/sleep.c

   1 /* -*- buffer-read-only: t -*- vi: set ro: */
   2 /* DO NOT EDIT! GENERATED AUTOMATICALLY! */
   3 /* Pausing execution of the current thread.
   4    Copyright (C) 2007, 2009-2011 Free Software Foundation, Inc.
   5    Written by Bruno Haible <bruno@clisp.org>, 2007.
   6
   7    This program is free software: you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include <config.h>
  21
  22 /* Specification.  */
  23 #include <unistd.h>
  24
  25 #include <limits.h>
  26
  27 #include "verify.h"
  28
  29 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
  30
  31 # define WIN32_LEAN_AND_MEAN  /* avoid including junk */
  32 # include <windows.h>
  33
  34 unsigned int
  35 sleep (unsigned int seconds)
  36 {
  37   unsigned int remaining;
  38
  39   /* Sleep for 1 second many times, because
  40        1. Sleep is not interruptiple by Ctrl-C,
  41        2. we want to avoid arithmetic overflow while multiplying with 1000.  */
  42   for (remaining = seconds; remaining > 0; remaining--)
  43     Sleep (1000);
  44
  45   return remaining;
  46 }
  47
  48 #elif HAVE_SLEEP
  49
  50 # undef sleep
  51
  52 /* Guarantee unlimited sleep and a reasonable return value.  Cygwin
  53    1.5.x rejects attempts to sleep more than 49.7 days (2**32
  54    milliseconds), but uses uninitialized memory which results in a
  55    garbage answer.  Similarly, Linux 2.6.9 with glibc 2.3.4 has a too
  56    small return value when asked to sleep more than 24.85 days.  */
  57 unsigned int
  58 rpl_sleep (unsigned int seconds)
  59 {
  60   /* This requires int larger than 16 bits.  */
  61   verify (UINT_MAX / 24 / 24 / 60 / 60);
  62   const unsigned int limit = 24 * 24 * 60 * 60;
  63   while (limit < seconds)
  64     {
  65       unsigned int result;
  66       seconds -= limit;
  67       result = sleep (limit);
  68       if (result)
  69         return seconds + result;
  70     }
  71   return sleep (seconds);
  72 }
  73
  74 #else /* !HAVE_SLEEP */
  75
  76  #error "Please port gnulib sleep.c to your platform, possibly using usleep() or select(), then report this to bug-gnulib."
  77
  78 #endif