int sys_shmem_access(void)
{
int pageNumber;
if(argint(0,&pageNumber)<0)
return -1;
if(shmem_access(pageNumber)==0)
return -1;
return (int)shmem_access(pageNumber);
}
int
main(int argc, char *argv[])
{
char *ptr;
int i;
char d, arr[6] = "CS537";
int pid = fork();
if (pid < 0) {
test_failed();
}
else if (pid == 0) {
// printf(1, "child shmem_counter before access: %d\n", shmem_count(3));
ptr = shmem_access(3);
if (ptr == NULL) {
test_failed();
}
for (i = 0; i < 5; i++) {
*(ptr+i) = arr[i];
printf(1, "write: %c\n", *(ptr+i));
}
for (i = 0; i < 5; i++) {
d = *(ptr+i);
printf(1, "read in child: %c\n", d);
}
// printf(1, "child shmem_counter after access: %d\n", shmem_count(3));
exit();
}
else {
wait();
// printf(1, "parent shmem_counter before access: %d\n", shmem_count(3));
ptr = shmem_access(3);
// printf(1, "parent shmem_counter after access: %d\n", shmem_count(3));
if (ptr == NULL) {
test_failed();
}
for (i = 0; i < 5; i++) {
printf(1, "read in parent: %c\n", *(ptr+i));
if (*(ptr+i) != arr[i]) {
printf(1, "%d\t%c\t%c\n", shmem_count(3), *(ptr+i), arr[i]);
test_failed();
}
}
}
test_passed();
exit();
}
int
main(int argc, char *argv[])
{
printf(1, "%x\n",shmem_access(0));
exit();
}
int
main(int argc, char *argv[])
{
void *ptr;
int n;
int i;
for (i = 0; i < 4; i++) {
ptr = shmem_access(i);
if (ptr == NULL) {
test_failed();
}
}
int pid = fork();
if (pid < 0) {
test_failed();
}
else if (pid == 0) {
for (i = 0; i < 4; i++) {
n = shmem_count(i);
if (n != 2) {
test_failed();
}
}
exit();
}
else {
wait();
}
test_passed();
exit();
}
int
main(int argc, char *argv[])
{
void *ptr;
int i;
for (i = 0; i < 4; i++) {
ptr = shmem_access(i);
if (ptr == NULL) {
test_failed();
}
}
int pid = fork();
if (pid < 0) {
test_failed();
}
else if (pid == 0) {
exec("echo", args); //echo represents shmem_access_exec2_helper.c
printf(1, "exec failed!\n");
test_failed();
exit();
}
else {
wait();
}
exit();
}
int
sys_shmem_access(void) {
int page_num;
// get page_num
if(argint(0, &page_num) < 0)
return -1;
// given currently running process
return (int)shmem_access(page_num, proc);
}
int
main(int argc, char *argv[])
{
// printf(1, "%x\n",shmem_access(0));
char *c=(char*) shmem_access(0);
printf(1,"return valur of shmem_access=%p\n",c);
printf(1,"return value of shmem_access=%p =%c\n",c,*c);
exit();
}
int
main(int argc, char *argv[])
{
char *ptr;
int i;
ptr = shmem_access(3);
if (ptr == NULL) {
test_failed();
}
char arr[4] = "tmp";
for (i = 0; i < 4; i++) {
*(ptr+i) = arr[i];
}
//argstr
int fd = open(ptr, O_WRONLY|O_CREATE);
if (fd == -1) {
printf(1, "open system call failed to take a string from within a shared page\n");
test_failed();
}
//argptr
int n = write(fd, ptr, 10);
if (n == -1) {
printf(1, "write system call failed to take a pointer from within a shared page\n");
test_failed();
}
//making sure invalid strings are still caught
int fd2 = open((char *)(USERTOP/2), O_WRONLY|O_CREATE);
if (fd2 != -1) {
printf(1, "open system call successfully accepted an invalid string\n");
test_failed();
}
//making sure invalid pointers are still caught
n = write(fd, (char *)(USERTOP/2), 10);
if (n != -1) {
printf(1, "write system call successfully accepted an invalid pointer\n");
test_failed();
}
//making sure edge case is checked
printf(1, "%d\n", ptr);
n = write(fd, (char *)(ptr + 4094), 3);
if (n != -1) {
printf(1, "write system call successfully accepted an overflowing pointer in a shared page\n");
test_failed();
}
test_passed();
exit();
}
int
main(int argc, char *argv[])
{
char *ptr;
int i;
char arr[6] = "CS537";
int pid = fork();
if (pid < 0) {
test_failed();
}
else if (pid == 0) {
ptr = shmem_access(3);
if (ptr == NULL) {
test_failed();
}
for (i = 0; i < 5; i++) {
*(ptr+i) = arr[i];
}
exit();
}
else {
wait();
ptr = shmem_access(3);
if (ptr == NULL) {
test_failed();
}
for (i = 0; i < 5; i++) {
if (*(ptr+i) != arr[i]) {
test_failed();
}
}
}
test_passed();
exit();
}
