nptl/tst-signal1.c

   1 /* Copyright (C) 2002-2020 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   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 <pthread.h>
  21 #include <signal.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <sys/mman.h>
  27 #include <sys/wait.h>
  28
  29
  30 static sigset_t ss;
  31 static pthread_barrier_t *b;
  32
  33
  34 static void *
  35 tf (void *arg)
  36 {
  37   sigdelset (&ss, SIGINT);
  38
  39   if (pthread_sigmask (SIG_SETMASK, &ss, NULL) != 0)
  40     {
  41       puts ("2nd pthread_sigmask failed");
  42       exit (1);
  43     }
  44
  45   pthread_barrier_wait (b);
  46
  47   int sig;
  48   int res = sigwait (&ss, &sig);
  49   if (res == 0)
  50     {
  51       printf ("sigwait returned successfully with signal %d\n", sig);
  52       exit (1);
  53     }
  54
  55   printf ("sigwait returned with %s (%d)\n", strerror (res), res);
  56
  57   return NULL;
  58 }
  59
  60
  61 static void
  62 receiver (void)
  63 {
  64   pthread_t th;
  65
  66   /* Make sure the process doesn't run forever.  */
  67   alarm (10);
  68
  69   sigfillset (&ss);
  70
  71   if (pthread_sigmask (SIG_SETMASK, &ss, NULL) != 0)
  72     {
  73       puts ("1st pthread_sigmask failed");
  74       exit (1);
  75     }
  76
  77   if (pthread_create (&th, NULL, tf, NULL) != 0)
  78     {
  79       puts ("pthread_create failed");
  80       exit (1);
  81     }
  82
  83   if (pthread_join (th, NULL) == 0)
  84     {
  85       puts ("thread joined?!");
  86       exit (1);
  87     }
  88
  89   _exit (0);
  90 }
  91
  92
  93 static int
  94 do_test (void)
  95 {
  96   char tmp[] = "/tmp/tst-signal1-XXXXXX";
  97
  98   int fd = mkstemp (tmp);
  99   if (fd == -1)
 100     {
 101       puts ("mkstemp failed");
 102       exit (1);
 103     }
 104
 105   unlink (tmp);
 106
 107   int i;
 108   for (i = 0; i < 20; ++i)
 109     write (fd, "foobar xyzzy", 12);
 110
 111   b = mmap (NULL, sizeof (pthread_barrier_t), PROT_READ | PROT_WRITE,
 112             MAP_SHARED, fd, 0);
 113   if (b == MAP_FAILED)
 114     {
 115       puts ("mmap failed");
 116       exit (1);
 117     }
 118
 119   pthread_barrierattr_t ba;
 120   if (pthread_barrierattr_init (&ba) != 0)
 121     {
 122       puts ("barrierattr_init failed");
 123       exit (1);
 124     }
 125
 126   if (pthread_barrierattr_setpshared (&ba, PTHREAD_PROCESS_SHARED) != 0)
 127     {
 128       puts ("barrierattr_setpshared failed");
 129       exit (1);
 130     }
 131
 132   if (pthread_barrier_init (b, &ba, 2) != 0)
 133     {
 134       puts ("barrier_init failed");
 135       exit (1);
 136     }
 137
 138   if (pthread_barrierattr_destroy (&ba) != 0)
 139     {
 140       puts ("barrierattr_destroy failed");
 141       exit (1);
 142     }
 143
 144   pid_t pid = fork ();
 145   if (pid == -1)
 146     {
 147       puts ("fork failed");
 148       exit (1);
 149     }
 150
 151   if (pid == 0)
 152     receiver ();
 153
 154   pthread_barrier_wait (b);
 155
 156   /* Wait a bit more.  */
 157   struct timespec ts = { .tv_sec = 0, .tv_nsec = 10000000 };
 158   nanosleep (&ts, NULL);
 159
 160   /* Send the signal.  */
 161   puts ("sending the signal now");
 162   kill (pid, SIGINT);
 163
 164   /* Wait for the process to terminate.  */
 165   int status;
 166   if (TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)) != pid)
 167     {
 168       puts ("wrong child reported terminated");
 169       exit (1);
 170     }
 171
 172   if (!WIFSIGNALED (status))
 173     {
 174       puts ("child wasn't signalled");
 175       exit (1);
 176     }
 177
 178   if (WTERMSIG (status) != SIGINT)
 179     {
 180       puts ("child not terminated with SIGINT");
 181       exit (1);
 182     }
 183
 184   return 0;
 185 }
 186
 187 #define TEST_FUNCTION do_test ()
 188 #include "../test-skeleton.c"