stdlib/tst-makecontext.c

   1 /* Copyright (C) 2006-2015 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <stdlib.h>
  20 #include <stdio.h>
  21 #include <ucontext.h>
  22
  23 ucontext_t ucp;
  24 char st1[8192];
  25 __thread int thr;
  26
  27 int somevar = -76;
  28 long othervar = -78L;
  29
  30 void
  31 cf (int i)
  32 {
  33   if (i != othervar || thr != 94)
  34     {
  35       printf ("i %d thr %d\n", i, thr);
  36       exit (1);
  37     }
  38
  39   /* Since uc_link below has been set to NULL, setcontext is supposed to
  40      terminate the process normally after this function returns.  */
  41 }
  42
  43 int
  44 do_test (void)
  45 {
  46   if (getcontext (&ucp) != 0)
  47     {
  48       if (errno == ENOSYS)
  49         {
  50           puts ("context handling not supported");
  51           return 0;
  52         }
  53
  54       puts ("getcontext failed");
  55       return 1;
  56     }
  57   thr = 94;
  58   ucp.uc_link = NULL;
  59   ucp.uc_stack.ss_sp = st1;
  60   ucp.uc_stack.ss_size = sizeof st1;
  61   makecontext (&ucp, (void (*) (void)) cf, 1, somevar - 2);
  62   if (setcontext (&ucp) != 0)
  63     {
  64       puts ("setcontext failed");
  65       return 1;
  66     }
  67   return 2;
  68 }
  69
  70 #define TEST_FUNCTION do_test ()
  71 #include "../test-skeleton.c"