gdbserver_tests/t.c

   1 #include <string.h>
   2 #include <pthread.h>
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5 #include <fcntl.h>
   6 #include <unistd.h>
   7 #include <sys/types.h>
   8 #include <sys/syscall.h>
   9 #include "../memcheck/memcheck.h"
  10 int using_threads = 0; /* test collision with a global in gdbserver */
  11 /* we will undefine one char on two */
  12 static char undefined[10] = "undefined";
  13
  14 #define LOOPS 10000000
  15 static int loopmain, loopt1, loopt2;
  16
  17 static double pi = 3.14159265358979323846264338327950288;
  18
  19 static pid_t gettid()
  20 {
  21 #ifdef __NT_gettid
  22    return syscall(__NR_gettid);
  23 #else
  24    return getpid();
  25 #endif
  26 }
  27 static void whoami(char *msg)
  28 {
  29    printf("pid %d Thread %d %s\n", getpid(), gettid(), msg); fflush(stdout);
  30 }
  31
  32 static int int_und;
  33 static int sleeps = 15;
  34 static void make_error (char *s)
  35 {
  36   char *make_error_name __attribute__((unused)) = "make_error name";
  37   char c __attribute__((unused));
  38   double pi2 __attribute__((unused)) = 2.0 * pi;
  39   whoami(s);
  40   if (int_und == 0)
  41      printf ("%s int_und is zero %d\n", s, int_und);
  42   else
  43      printf ("%s int_und is not zero\n", s);
  44   fflush(stdout);
  45 }
  46
  47 static void level ()
  48 {
  49   char *level_name __attribute__((unused)) = "level name";
  50   make_error ("called from level");
  51 }
  52
  53 static void loops (int *loopnr)
  54 {
  55   int i, j;
  56   for (i = 0; i < LOOPS; i++)
  57     for (j = 0; j < LOOPS; j++)
  58       (*loopnr)++;
  59 }
  60
  61 static void *brussels_fn(void *v)
  62 {
  63   char *brussels_name __attribute__((unused)) = "Brussels";
  64   make_error ("called from Brussels");
  65   loopt1 = 1;
  66   while (! (loopt1 && loopt2 && loopmain))
  67     loopt1++;
  68   loops (&loopt1);
  69   return NULL;
  70 }
  71 static void *london_fn(void *v)
  72 {
  73   char *london_name __attribute__((unused)) = "London";
  74   make_error ("called from London");
  75   loopt2 = 1;
  76   while (! (loopt1 && loopt2 && loopmain))
  77     loopt2++;
  78   loops (&loopt2);
  79   sleep(10);
  80   return NULL;
  81 }
  82 static void *petaouchnok_fn(void *v)
  83 {
  84   char *petaouchnok_name __attribute__((unused)) = "Petaouchnok";
  85   struct timeval t;
  86   int i;
  87   for (i = 1; i <= sleeps; i++) {
  88       t.tv_sec = 5;
  89       t.tv_usec = 0;
  90       fprintf (stderr, "Petaouchnok sleep nr %d out of %d sleeping 5 seconds\n",
  91                i, sleeps);
  92       fflush(stderr);
  93       select (0, NULL, NULL, NULL, &t);
  94   }
  95   return NULL;
  96 }
  97 static void leaf(void) {}
  98 static void breakme(int line)
  99 {
 100    if (line > 1000)
 101       leaf(); // ensures not leaf, as ppc unwind implies VEX iropt precise exns
 102 }
 103 int main (int argc, char *argv[])
 104 {
 105   char *main_name __attribute__((unused)) = "main name";
 106   pthread_t ebbr, egll, zzzz;
 107   int i = 1234;
 108   char undef = '?';
 109   char *some_mem __attribute__((unused)) = malloc(100);
 110   VALGRIND_MAKE_MEM_UNDEFINED(&undef, 1);
 111   int len = strlen(undefined);
 112   breakme(__LINE__); //break1
 113   for (i = len-1; i >= 0; i=i-2)
 114      undefined[i] = undef;
 115   *(char*)&int_und = undef;
 116
 117   breakme(__LINE__); //break2
 118
 119   if (argc > 1)
 120     sleeps = atoi(argv[1]);
 121
 122   level();
 123   make_error ("called from main");
 124
 125   pthread_create(&ebbr, NULL, brussels_fn, NULL);
 126   pthread_create(&egll, NULL, london_fn, NULL);
 127   pthread_create(&zzzz, NULL, petaouchnok_fn, NULL);
 128
 129   loopmain = 1;
 130   while (! (loopt1 && loopt2 && loopmain))
 131     loopmain++;
 132   for (i = 0; i < LOOPS; i++) {
 133      loopmain++;
 134
 135      if (loopmain == 10000)
 136         make_error ("in main loop");
 137   }
 138
 139   pthread_join(ebbr, NULL);
 140
 141   make_error ("called from main (the end, before joining t3)");
 142
 143   pthread_join(zzzz, NULL);
 144
 145   if (argc > 2) {
 146      for (i = 0; i < 100; i++)
 147         if ((*(&undef + i*4000) == 0) || (*(&undef - i*4000) == 0)) {
 148            printf ("there are some null bytes here and there %d\n", i);
 149            fflush(stdout);
 150         }
 151   }
 152   exit(0);
 153 }