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 {
  39         TPRINTF("Will do a long jump back to test_it().\n");
  40         longjmp(jmp_env, 1);
  41 }
  42
  43 static const char *test_it(void)
  44 {
  45         int second_round = setjmp(jmp_env);
  46         counter++;
  47         TPRINTF("Just after setjmp(), counter is %d.\n", counter);
  48         if (second_round) {
  49                 if (counter != 2) {
  50                         return "setjmp() have not returned twice";
  51                 } else {
  52                         return NULL;
  53                 }
  54         }
  55
  56         if (counter != 1) {
  57                 return "Shall not reach here more than once";
  58         }
  59
  60         do_the_long_jump();
  61
  62         return "Survived a long jump";
  63 }
  64
  65 const char *test_setjmp1(void)
  66 {
  67         counter = 0;
  68
  69         const char *err_msg = test_it();
  70
  71         return err_msg;
  72 }