signal/tst-sigwait-eintr.c

   1 /* Check that sigwait does not fail with EINTR (bug 22478).
   2    Copyright (C) 2017-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <signal.h>
  21 #include <stdio.h>
  22 #include <support/check.h>
  23 #include <support/xunistd.h>
  24 #include <time.h>
  25 #include <unistd.h>
  26
  27 /* Handler for SIGUSR1.  */
  28 static void
  29 sigusr1_handler (int signo)
  30 {
  31   TEST_VERIFY (signo == SIGUSR1);
  32 }
  33
  34 /* Spawn a subprocess to send two signals: First SIGUSR1, then
  35    SIGUSR2.  Return the PID of the process.  */
  36 static pid_t
  37 signal_sender (void)
  38 {
  39   pid_t pid = xfork ();
  40   if (pid == 0)
  41     {
  42       static const struct timespec delay = { 1, };
  43       if (nanosleep (&delay, NULL) != 0)
  44         FAIL_EXIT1 ("nanosleep: %m");
  45       if (kill (getppid (), SIGUSR1) != 0)
  46         FAIL_EXIT1 ("kill (SIGUSR1): %m");
  47       if (nanosleep (&delay, NULL) != 0)
  48         FAIL_EXIT1 ("nanosleep: %m");
  49       if (kill (getppid (), SIGUSR2) != 0)
  50         FAIL_EXIT1 ("kill (SIGUSR2): %m");
  51       _exit (0);
  52     }
  53   return pid;
  54 }
  55
  56 static int
  57 do_test (void)
  58 {
  59   if (signal (SIGUSR1, sigusr1_handler) == SIG_ERR)
  60     FAIL_EXIT1 ("signal (SIGUSR1): %m\n");
  61
  62   sigset_t sigs;
  63   sigemptyset (&sigs);
  64   sigaddset (&sigs, SIGUSR2);
  65   if (sigprocmask (SIG_BLOCK, &sigs, NULL) != 0)
  66     FAIL_EXIT1 ("sigprocmask (SIGBLOCK, SIGUSR2): %m");
  67   pid_t pid = signal_sender ();
  68   int signo = 0;
  69   int ret = sigwait (&sigs, &signo);
  70   if (ret != 0)
  71     {
  72       support_record_failure ();
  73       errno = ret;
  74       printf ("error: sigwait failed: %m (%d)\n", ret);
  75     }
  76   TEST_VERIFY (signo == SIGUSR2);
  77
  78   int status;
  79   xwaitpid (pid, &status, 0);
  80   TEST_VERIFY (status == 0);
  81
  82   return 0;
  83 }
  84
  85 #include <support/test-driver.c>