src/tests/vm/mmap-inherit.c


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/* Maps a file into memory and runs child-inherit to verify that
   mappings are not inherited. */

#include <string.h>
#include <syscall.h>
#include "tests/vm/sample.inc"
#include "tests/lib.h"
#include "tests/main.h"

void
test_main (void)
{
  char *actual = (char *) 0x54321000;
  int handle;
  pid_t child;

  /* Open file, map, verify data. */
  CHECK ((handle = open ("sample.txt")) > 1, "open \"sample.txt\"");
  CHECK (mmap (handle, actual) != MAP_FAILED, "mmap \"sample.txt\"");
  if (memcmp (actual, sample, strlen (sample)))
    fail ("read of mmap'd file reported bad data");

  /* Spawn child and wait. */
  CHECK ((child = exec ("child-inherit")) != -1, "exec \"child-inherit\"");
  quiet = true;
  CHECK (wait (child) == -1, "wait for child (should return -1)");
  quiet = false;

  /* Verify data again. */
  CHECK (!memcmp (actual, sample, strlen (sample)),
         "checking that mmap'd file still has same data");
}