rt/tst-shm-cancel.c

   1 /* Test for shm_open cancellation handling: BZ #18243.
   2    Copyright (C) 2016-2019 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 <pthread.h>
  20 #include <sys/mman.h>
  21 #include <semaphore.h>
  22 #include <stdio.h>
  23 #include <fcntl.h>
  24 #include <unistd.h>
  25 #include <errno.h>
  26 #include <stdlib.h>
  27
  28 static sem_t sem;       /* Use to sync with thread start.  */
  29 static const char shm_name[] = "/glibc-shm_open-cancel";
  30
  31 static void
  32 remove_shm (int status, void *arg)
  33 {
  34   shm_unlink (shm_name);
  35 }
  36
  37 static void *
  38 tf (void *arg)
  39 {
  40   pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, 0);
  41
  42   if (sem_wait (&sem) != 0)
  43     {
  44       printf ("error: sem_wait failed: %m");
  45       exit (1);
  46     }
  47
  48   if (pthread_setcancelstate (PTHREAD_CANCEL_ENABLE, 0) != 0)
  49     {
  50       printf ("error: pthread_setcancelstate failed: %m");
  51       exit (1);
  52     }
  53
  54   /* Neither sem_unlink or sem_open should act on thread cancellation.  */
  55   shm_unlink (shm_name);
  56   on_exit (remove_shm, NULL);
  57
  58   int fd = shm_open (shm_name, O_CREAT, 0600);
  59   if (fd == -1)
  60     {
  61       int exit_code;
  62       if (errno == ENOSYS || errno == EACCES)
  63         exit_code = 77;
  64       else
  65         exit_code = 1;
  66       exit (exit_code);
  67     }
  68
  69   if (pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, 0) != 0)
  70     {
  71       printf ("error: pthread_setcancelstate failed: %m");
  72       exit (1);
  73     }
  74
  75   if (close (fd) != 0)
  76     {
  77       printf ("error: pthread_setcancelstate failed: %m");
  78       exit (1);
  79     }
  80
  81   return NULL;
  82 }
  83
  84 static int
  85 do_test (void)
  86 {
  87   pthread_t td;
  88
  89   if (sem_init (&sem, 0, 0))
  90     {
  91       printf ("error: sem_init failed: %m\n");
  92       exit (1);
  93     }
  94
  95   if (pthread_create (&td, NULL, tf, NULL) != 0)
  96     {
  97       printf ("error: pthread_create failed: %m\n");
  98       exit (1);
  99     }
 100
 101   if (pthread_cancel (td) != 0)
 102     {
 103       printf ("error: pthread_cancel failed: %m\n");
 104       exit (1);
 105     }
 106
 107   if (sem_post (&sem) != 0)
 108     {
 109       printf ("error: sem_post failed: %m\n");
 110       exit (1);
 111     }
 112
 113   void *r;
 114   if (pthread_join (td, &r) != 0)
 115     {
 116       printf ("error: pthread_join failed: %m\n");
 117       exit (1);
 118     }
 119
 120   if (r == PTHREAD_CANCELED)
 121     {
 122       puts ("error: pthread_join returned PTHREAD_CANCELED");
 123       exit (1);
 124     }
 125
 126   return 0;
 127 }
 128
 129 #define TEST_FUNCTION do_test ()
 130 #include <test-skeleton.c>