int
munprotect(void *addr, int len)
{
int ret = -1;
uint addrint = (uint)addr;
//Checks if page-aligned
if (addrint % PGSIZE != 0)
{
return ret;
}
//Check if addr is not too large
/*
int procint = *proc;
if ( (*addrint +len) > (procint + proc->sz) )
{
return -1;
}
*/
//cprintf("%s%d\n", "lengthoutside = ", len);
if(len <= 0)
{
//cprintf("%s%d\n", "lengthinside = ", len);
//cprintf("-1 on 1\n");
return ret;
}
if(addrint + (len * PGSIZE) > proc->sz)
{
//cprintf("-1 on 2\n");
return ret;
}
if(addrint > proc->sz || addrint <= 0)
{
//cprintf("-1 on 3\n");
return ret;
}
//NOT SURE IF WE NEED ALL THIS CODE -CONOR
//int pid = proc->pid:
//int *addrint = addr;
//acquire(&ptable.lock);
//if (pid < 0 || pid >= NPROC) {
// release(&ptable.lock);
// return ret;
// }
ret = 0;
do_munprotect(proc, addr);
return ret;
}
int kern_munprotect(void * addr, int len) {
if ((int)addr % PGSIZE != 0)
return -1;
// another check needed: addr too large
if ((uint)addr <= 0 || (uint)addr > proc->sz)
return -1;
if (len <= 0 || (len*PGSIZE)+(int)addr > proc->sz)
return -1;
acquire(&ptable.lock);
do_munprotect(proc, (int)addr, len);
release(&ptable.lock);
return 0;
}
int
kern_munprotect(void *addr, int len){
if((int)addr % PGSIZE != 0)
return -1;
if((int)addr >= proc->sz || (int)addr + 4 > proc->sz)
return -1;
if(len <= 0)
return -1;
if((int)addr + (len * PGSIZE) > proc->sz)
return -1;
if(addr == 0)
return -1;
do_munprotect((void*)addr,len);
return 0;
}
int kern_munprotect(struct proc* process,void* addr, int len) {
unsigned int start = (unsigned int) addr;
//bounds checking
if (addr == 0) return -1; // fail on null address
if (start % PGSIZE != 0) return -1;
if (start > process->sz) return -1;
if (len <= 0) return -1;
if ((start + PGSIZE*len) > process->sz) return -1;
int i;
for (i = start; i < start + (len * PGSIZE); i+= PGSIZE) {
if (do_munprotect(process, (void*) i) == -1)
return -1; // propagate -1 to user process
}
lcr3(v2p(process->pgdir));
return 0;
}