memcheck/tests/solaris/brk.c

   1 /* Test for the brk syscall wrapper. */
   2
   3 #include <assert.h>
   4 #include <errno.h>
   5 #include <stddef.h>
   6 #include <sys/syscall.h>
   7
   8 /* Data segment end. */
   9 extern int _end;
  10 static char *begin = (char *)&_end;
  11
  12 __attribute__((noinline))
  13 static int test_begin(void)
  14 {
  15    int res = 0;
  16    int tmp;
  17
  18    /* Check that a value at the break is inaccessible. */
  19    if (*begin)
  20       res++;
  21
  22    /* Allocate one byte and check that the last byte is accessible and
  23       initialized. */
  24    tmp = syscall(SYS_brk, begin + 1);
  25    assert(tmp != -1);
  26    if (*begin)
  27       res++;
  28
  29    /* Deallocate one byte and check that the last byte is now inaccessible. */
  30    tmp = syscall(SYS_brk, begin);
  31    assert(tmp != -1);
  32    if (*begin)
  33       res++;
  34
  35    return res;
  36 }
  37
  38 __attribute__((noinline))
  39 static void test_updown(void)
  40 {
  41    int tmp;
  42    size_t i;
  43
  44 #define MAX_SIZE 8192
  45    /* Run up phase. */
  46    for (i = 0; i < MAX_SIZE; i++) {
  47       tmp = syscall(SYS_brk, begin + i);
  48       assert(tmp != -1);
  49    }
  50
  51    /* Run down phase. */
  52    for (i = 0; i < MAX_SIZE; i++) {
  53       tmp = syscall(SYS_brk, begin + MAX_SIZE - 1 - i);
  54       assert(tmp != -1);
  55    }
  56 #undef MAX_SIZE
  57 }
  58
  59 __attribute__((noinline))
  60 static void test_range(void)
  61 {
  62    int tmp;
  63
  64    tmp = syscall(SYS_brk, begin - 1);
  65    assert(tmp == -1);
  66    assert(errno == ENOMEM);
  67
  68    /* Unified limit for 64-bit and 32-bit version. */
  69    unsigned long long impossible_limit = 0xffffff4fffffffULL;
  70    tmp = syscall(SYS_brk, impossible_limit);
  71    assert(tmp == -1);
  72    assert(errno == ENOMEM);
  73 }
  74
  75 int main(void)
  76 {
  77    int res;
  78    res = test_begin();
  79    test_updown();
  80    test_range();
  81    return res;
  82 }
  83