tests/test-nanosleep.c

   1 /* Test of nanosleep() function.
   2    Copyright (C) 2009-2024 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   /* Check that negative nanosecond values cause failure.  */
  47   ts.tv_sec = 1;
  48   ts.tv_nsec = -1;
  49   errno = 0;
  50   ASSERT (nanosleep (&ts, NULL) == -1);
  51   ASSERT (errno == EINVAL);
  52
  53   ts.tv_sec = 1000;
  54   ts.tv_nsec = -1;
  55   errno = 0;
  56   ASSERT (nanosleep (&ts, NULL) == -1);
  57   ASSERT (errno == EINVAL);
  58
  59   /* Check that too large nanosecond values cause failure.  */
  60   ts.tv_sec = 1000;
  61   ts.tv_nsec = 1000000000;
  62   errno = 0;
  63   ASSERT (nanosleep (&ts, NULL) == -1);
  64   ASSERT (errno == EINVAL);
  65
  66   /* Check successful call.  */
  67   ts.tv_sec = 0;
  68   ts.tv_nsec = 1;
  69   ASSERT (nanosleep (&ts, &ts) == 0);
  70   /* Remaining time is only defined on EINTR failure; but on success,
  71      it is typically either 0 or unchanged from input.  At any rate,
  72      it shouldn't be randomly changed to unrelated values.  */
  73   ASSERT (ts.tv_sec == 0);
  74   ASSERT (ts.tv_nsec == 0 || ts.tv_nsec == 1);
  75   ts.tv_nsec = 0;
  76   ASSERT (nanosleep (&ts, NULL) == 0);
  77
  78 #if HAVE_DECL_ALARM
  79   {
  80     const time_t pentecost = 50 * 24 * 60 * 60; /* 50 days.  */
  81     signal (SIGALRM, handle_alarm);
  82     alarm (1);
  83     ts.tv_sec = pentecost;
  84     ts.tv_nsec = 999999999;
  85     errno = 0;
  86     ASSERT (nanosleep (&ts, &ts) == -1);
  87     ASSERT (errno == EINTR);
  88     ASSERT (pentecost - 10 < ts.tv_sec && ts.tv_sec <= pentecost);
  89     ASSERT (0 <= ts.tv_nsec && ts.tv_nsec <= 999999999);
  90   }
  91 #endif
  92
  93   return test_exit_status;
  94 }