sysdeps/unix/sysv/linux/x86/tst-saved_mask-1.c

   1 /* Test that sigprocmask does not read from the unused part of jmpbuf.
   2    Copyright (C) 2017-2019 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 <stdlib.h>
  20 #include <signal.h>
  21 #include <string.h>
  22 #include <errno.h>
  23 #include <setjmpP.h>
  24 #include <support/next_to_fault.h>
  25
  26 #define SIZEOF_SIGSET_T sizeof (__jmp_buf_sigset_t)
  27
  28 static int
  29 do_test (void)
  30 {
  31   sigjmp_buf sj;
  32   struct support_next_to_fault sigset_t_buf
  33     = support_next_to_fault_allocate (SIZEOF_SIGSET_T);
  34   sigset_t *m_p = (sigset_t *) sigset_t_buf.buffer;
  35   sigset_t m;
  36
  37   sigemptyset (&m);
  38   memcpy (m_p, &m, SIZEOF_SIGSET_T);
  39   sigprocmask (SIG_SETMASK, m_p, NULL);
  40   memcpy (&m, m_p, SIZEOF_SIGSET_T);
  41   if (sigsetjmp (sj, 0) == 0)
  42     {
  43       sigaddset (&m, SIGUSR1);
  44       memcpy (m_p, &m, SIZEOF_SIGSET_T);
  45       sigprocmask (SIG_SETMASK, m_p, NULL);
  46       memcpy (&m, m_p, SIZEOF_SIGSET_T);
  47       siglongjmp (sj, 1);
  48       return EXIT_FAILURE;
  49     }
  50   sigprocmask (SIG_SETMASK, NULL, m_p);
  51   memcpy (&m, m_p, SIZEOF_SIGSET_T);
  52   return sigismember (&m, SIGUSR1) ? EXIT_SUCCESS : EXIT_FAILURE;
  53 }
  54
  55 #include <support/test-driver.c>