CS代考计算机代写 /* Writes to a file through a mapping, and unmaps the file,

/* Writes to a file through a mapping, and unmaps the file,
then reads the data in the file back using the read system
call to verify. */

#include
#include
#include “tests/vm/sample.inc”
#include “tests/lib.h”
#include “tests/main.h”

#define ACTUAL ((void *) 0x10000000)

void
test_main (void)
{
int handle;
mapid_t map;
char buf[1024];

/* Write file via mmap. */
CHECK (create (“sample.txt”, strlen (sample)), “create ”sample.txt””);
CHECK ((handle = open (“sample.txt”)) > 1, “open ”sample.txt””);
CHECK ((map = mmap (handle, ACTUAL)) != MAP_FAILED, “mmap ”sample.txt””);
memcpy (ACTUAL, sample, strlen (sample));
munmap (map);

/* Read back via read(). */
read (handle, buf, strlen (sample));
CHECK (!memcmp (buf, sample, strlen (sample)),
“compare read data against written data”);
close (handle);
}