CS代考计算机代写 /* Maps a file into memory and runs child-inherit to verify that

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

#include
#include
#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”);
}