void segmentation_handler(vaddr_t faultaddress,
int faulttype,
vaddr_t heap_start,
vaddr_t stacktop,
vaddr_t segment1_top,
vaddr_t segment1_bottom,
vaddr_t segment2_top,
vaddr_t segment2_bottom
)
{
/* check the faultaddress within valid region*/
if((faultaddress >= segment1_bottom && faultaddress <= segment1_top))
{
/* check protection fault*/
if( faulttype == VM_FAULT_READONLY )
{
/*segmentation fault*/
freePid(curthread->pid);
thread_exit();
}
}
else if((faultaddress >= segment2_bottom && faultaddress <= segment2_top))
{
/* check protection fault*/
if( faulttype == VM_FAULT_READONLY )
{
/*segmentation fault*/
freePid(curthread->pid);
thread_exit();
}
}
/*
*temporary work, did not consider malloc heap region
*/
else if((faultaddress >= heap_start && faultaddress <= stacktop))
{
/* check protection fault*/
if( faulttype == VM_FAULT_READONLY )
{
/*segmentation fault*/
freePid(curthread->pid);
thread_exit();
}
}
else
{
/*not in valid region , segmentation fault*/
freePid(curthread->pid);
thread_exit();
}
}
static void freeAll() {
int i = 0;
for (i = 0; i < cmpQty; ++i) {
freeCompany(cmp[i]);
}
free(cmp);
freeMap(map);
freePid();
free(semMsg);
free(procQty);
}
int waitpid(pid_t pid, int * status, int options, int *wait_pid)
{
struct process * p_node;
int invalid_status_ptr1;
int invalid_status_ptr2;
int result;
invalid_status_ptr1 = 0x80000000;
invalid_status_ptr2 = 0x40000000;
/* check the validity of parameter pid*/
if(pid > PID_MAX || pid <= 0 || pid > (array_getnum(pid_table) - 1) || options != 0)
{
return EINVAL;
}
if(status == NULL || status == (int *)invalid_status_ptr1 || status == (int *)invalid_status_ptr2)
{
return EFAULT;
}
/* if we didnot find the specific pid value in our pid_table*/
if(array_getguy(pid_table, pid) == NULL)
{
kprintf("process does not exist\n");
return EINVAL;
}
/* parent process can ONLY interested in own child process*/
if(((struct process *)array_getguy(pid_table, pid))->parent_pid != curthread->pid )
{
kprintf("parent process NOT interested in own child process\n") ;
return EINVAL;
}
/* get the process guy with specific pid*/
p_node = (struct process *)array_getguy(pid_table, pid);
/* check if the child process has exited*/
P(p_node->exit_lock);
/* child already really exit*/
/*return the exit code*/
*status = p_node->exit_code;
/*return the child process id*/
*wait_pid = pid;
result = freePid(pid);
if(result)
{
return result;
}
return 0;
}