tests/test-nanosleep.c

   1 /* Test of nanosleep() function.
   2    Copyright (C) 2009-2021 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Eric Blake <ebb9@byu.net>, 2009.  */
  18
  19 #include <config.h>
  20
  21 #include <time.h>
  22
  23 #include "signature.h"
  24 SIGNATURE_CHECK (nanosleep, int, (struct timespec const *, struct timespec *));
  25
  26 #include <errno.h>
  27 #include <signal.h>
  28 #include <unistd.h>
  29
  30 #include "macros.h"
  31
  32 #if HAVE_DECL_ALARM
  33 static void
  34 handle_alarm (int sig)
  35 {
  36   if (sig != SIGALRM)
  37     _exit (1);
  38 }
  39 #endif
  40
  41 int
  42 main (void)
  43 {
  44   struct timespec ts;
  45
  46   ts.tv_sec = 1000;
  47   ts.tv_nsec = -1;
  48   errno = 0;
  49   ASSERT (nanosleep (&ts, NULL) == -1);
  50   ASSERT (errno == EINVAL);
  51   ts.tv_nsec = 1000000000;
  52   errno = 0;
  53   ASSERT (nanosleep (&ts, NULL) == -1);
  54   ASSERT (errno == EINVAL);
  55
  56   ts.tv_sec = 0;
  57   ts.tv_nsec = 1;
  58   ASSERT (nanosleep (&ts, &ts) == 0);
  59   /* Remaining time is only defined on EINTR failure; but on success,
  60      it is typically either 0 or unchanged from input.  At any rate,
  61      it shouldn't be randomly changed to unrelated values.  */
  62   ASSERT (ts.tv_sec == 0);
  63   ASSERT (ts.tv_nsec == 0 || ts.tv_nsec == 1);
  64   ts.tv_nsec = 0;
  65   ASSERT (nanosleep (&ts, NULL) == 0);
  66
  67 #if HAVE_DECL_ALARM
  68   {
  69     const time_t pentecost = 50 * 24 * 60 * 60; /* 50 days.  */
  70     signal (SIGALRM, handle_alarm);
  71     alarm (1);
  72     ts.tv_sec = pentecost;
  73     ts.tv_nsec = 999999999;
  74     errno = 0;
  75     ASSERT (nanosleep (&ts, &ts) == -1);
  76     ASSERT (errno == EINTR);
  77     ASSERT (pentecost - 10 < ts.tv_sec && ts.tv_sec <= pentecost);
  78     ASSERT (0 <= ts.tv_nsec && ts.tv_nsec <= 999999999);
  79   }
  80 #endif
  81
  82   return 0;
  83 }