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/* Create a large file, and mmap it several times, writing to
different pages. Then unmaps the file, and reads the data back
to verify */
#include <string.h>
#include <syscall.h>
#include "tests/vm/sample.inc"
#include "tests/lib.h"
#include "tests/main.h"
/* Offset needs to be larger or equal to page size */
#define OFFSET(i) (8192*(i))
/* Number of times file is mmapped */
#define N (8)
/* Size of file */
#define FILE_SIZE (1024*1024)
/* Address for mmap */
#define ACTUAL(i) ((void *) (0x10000000 + (i)*FILE_SIZE))
void
test_main (void)
{
int i;
int handle;
mapid_t map[N];
char buf[1024];
/* create file */
CHECK (create ("sample.txt", FILE_SIZE), "create \"sample.txt\"");
CHECK ((handle = open ("sample.txt")) > 1, "open \"sample.txt\"");
/* mmap */
for (i = 0; i < N; i++) {
CHECK ((map[i] = mmap (handle, ACTUAL(i))) != MAP_FAILED, "mmap \"sample.txt\"");
}
/* write */
for (i = 0; i < N; i++) {
memcpy (buf, ACTUAL(i)+OFFSET(i+N), 1024); /* not checked */
memcpy (ACTUAL(i)+OFFSET(i), sample, strlen (sample));
}
/* munmap */
for (i = 0; i < N; i++) {
munmap (map[i]);
}
/* Read back via read(). */
for (i = 0; i < N; i++) {
seek (handle, OFFSET(i));
read (handle, buf, strlen (sample));
CHECK (!memcmp (buf, sample, strlen (sample)),
"compare read data against written data");
}
close (handle);
}
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