nptl/tst-basic7.c

   1 #include <errno.h>
   2 #include <limits.h>
   3 #include <pthread.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include <unistd.h>
   8 #include <sys/mman.h>
   9 #include <sys/resource.h>
  10
  11 static void use_stack (size_t needed);
  12
  13 void (*use_stack_ptr) (size_t) = use_stack;
  14
  15 static void
  16 use_stack (size_t needed)
  17 {
  18   size_t sz = sysconf (_SC_PAGESIZE);
  19   char *buf = alloca (sz);
  20   memset (buf, '\0', sz);
  21
  22   if (needed > sz)
  23     use_stack_ptr (needed  - sz);
  24 }
  25
  26 static void
  27 use_up_memory (void)
  28 {
  29   struct rlimit rl;
  30   getrlimit (RLIMIT_AS, &rl);
  31   rl.rlim_cur = 10 * 1024 * 1024;
  32   setrlimit (RLIMIT_AS, &rl);
  33
  34   char *c;
  35   int PAGESIZE = getpagesize ();
  36   while (1)
  37     {
  38       c = mmap (NULL, PAGESIZE, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0);
  39       if (c == MAP_FAILED)
  40         break;
  41     }
  42 }
  43
  44 static void *
  45 child (void *arg)
  46 {
  47   sleep (1);
  48   return arg;
  49 }
  50
  51 static int
  52 do_test (void)
  53 {
  54   int err;
  55   pthread_t tid;
  56
  57   /* Allocate the memory needed for the stack.  */
  58   use_stack_ptr (PTHREAD_STACK_MIN);
  59
  60   use_up_memory ();
  61
  62   err = pthread_create (&tid, NULL, child, NULL);
  63   if (err != 0)
  64     {
  65       printf ("pthread_create returns %d: %s\n", err,
  66               err == EAGAIN ? "OK" : "FAIL");
  67       return err != EAGAIN;
  68     }
  69
  70   /* We did not fail to allocate memory despite the preparation.  Oh well.  */
  71   return 0;
  72 }
  73
  74 #define TEST_FUNCTION do_test ()
  75 #include "../test-skeleton.c"