stdlib/tst-setcontext8.c

   1 /* Check getcontext and setcontext on the context from makecontext.
   2    Copyright (C) 2018 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <ucontext.h>
  22 #include <unistd.h>
  23 #include <stdatomic.h>
  24
  25 static ucontext_t ctx[3];
  26 static atomic_int done;
  27
  28 static void
  29 __attribute__((noinline, noclone))
  30 f2 (void)
  31 {
  32   printf ("start f2\n");
  33   done++;
  34   if (setcontext (&ctx[2]) != 0)
  35     {
  36       printf ("%s: setcontext: %m\n", __FUNCTION__);
  37       exit (EXIT_FAILURE);
  38     }
  39 }
  40
  41 static void
  42 f1 (void)
  43 {
  44   printf ("start f1\n");
  45   if (getcontext (&ctx[2]) != 0)
  46     {
  47       printf ("%s: getcontext: %m\n", __FUNCTION__);
  48       exit (EXIT_FAILURE);
  49     }
  50   if (done)
  51     exit (EXIT_SUCCESS);
  52   f2 ();
  53 }
  54
  55 static int
  56 do_test (void)
  57 {
  58   char st1[32768];
  59   puts ("making contexts");
  60   if (getcontext (&ctx[0]) != 0)
  61     {
  62       printf ("%s: getcontext: %m\n", __FUNCTION__);
  63       exit (EXIT_FAILURE);
  64     }
  65   if (getcontext (&ctx[1]) != 0)
  66     {
  67       printf ("%s: getcontext: %m\n", __FUNCTION__);
  68       exit (EXIT_FAILURE);
  69     }
  70   ctx[1].uc_stack.ss_sp = st1;
  71   ctx[1].uc_stack.ss_size = sizeof st1;
  72   ctx[1].uc_link = &ctx[0];
  73   makecontext (&ctx[1], (void (*) (void)) f1, 0);
  74   if (setcontext (&ctx[1]) != 0)
  75     {
  76       printf ("%s: setcontext: %m\n", __FUNCTION__);
  77       exit (EXIT_FAILURE);
  78     }
  79   exit (EXIT_FAILURE);
  80 }
  81
  82 #include <support/test-driver.c>