uspace/app/tester/thread/setjmp1.c

   1 /*
   2  * Copyright (c) 2013 Vojtech Horky
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * - Redistributions of source code must retain the above copyright
  10  *   notice, this list of conditions and the following disclaimer.
  11  * - Redistributions in binary form must reproduce the above copyright
  12  *   notice, this list of conditions and the following disclaimer in the
  13  *   documentation and/or other materials provided with the distribution.
  14  * - The name of the author may not be used to endorse or promote products
  15  *   derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include <setjmp.h>
  30 #include <stdlib.h>
  31 #include <stddef.h>
  32 #include "../tester.h"
  33
  34 static jmp_buf jmp_env;
  35 static int counter;
  36
  37 static void do_the_long_jump(void) {
  38         TPRINTF("Will do a long jump back to test_it().\n");
  39         longjmp(jmp_env, 1);
  40 }
  41
  42 static const char *test_it(void) {
  43         int second_round = setjmp(jmp_env);
  44         counter++;
  45         TPRINTF("Just after setjmp(), counter is %d.\n", counter);
  46         if (second_round) {
  47                 if (counter != 2) {
  48                         return "setjmp() have not returned twice";
  49                 } else {
  50                         return NULL;
  51                 }
  52         }
  53
  54         if (counter != 1) {
  55                 return "Shall not reach here more than once";
  56         }
  57
  58         do_the_long_jump();
  59
  60         return "Survived a long jump";
  61 }
  62
  63 const char *test_setjmp1(void)
  64 {
  65         counter = 0;
  66
  67         const char *err_msg = test_it();
  68
  69         return err_msg;
  70 }