int main() {
MemDB_Initialize();
CREATE_NEW_MESSAGE_PTR(msg);
msg->MsgType = CardinalMsgType_Notification;
msg->MsgID = 0;
PostIPCMessages(2 /*userboot PID*/, &msg, 1);
while(1) {
CREATE_NEW_MESSAGE_PTR(msg);
POLL_MESSAGE(msg);
if(msg->MsgType == CardinalMsgType_Request) {
MsgHeader *msg_h = (MsgHeader*)msg;
switch(msg_h->MsgType) {
case MemoryServerMessageType_MMapRequest: {
mmap_handler(msg);
}
break;
}
} else
HandleSystemMessages(msg);
}
}
static void syscall_handler(struct intr_frame *f) {
void *esp = f->esp;
thread_current()->saved_esp = f->esp;
// printf("$esp = %p\n",esp);
byte_access_ok(esp,false);
// hex_dump(esp, esp,16,true);
// printf("\n");
int sys_call_num = *(int*) esp;
esp += sizeof(int *);
byte_access_ok(esp,false);
// printf("$sys_call_num = %p\n",sys_call_num);
char* argv[5];
switch (sys_call_num) {
/* Projects 2 and later. */
//TODO: please retrieve parameters from the stack
// and pass them to the handlers.
case SYS_HALT: /* Halt the operating system. */
halt_handler();
break;
case SYS_EXIT: /* Terminate this process. */
parse_arg(esp, 1, argv);
exit_handler((int) argv[0]);
break;
case SYS_EXEC: /* Start another process. */
parse_arg(esp, 1, argv);
f->eax=exec_handler((void*)argv[0]);
break;
case SYS_WAIT: /* Wait for a child process to die. */
parse_arg(esp, 1, argv);
f->eax=wait_handler((int) argv[0]);
break;
case SYS_CREATE: /* Create a file. */
parse_arg(esp, 2, argv);
f->eax=create_handler((void*)argv[0], (unsigned) argv[1]);
break;
case SYS_REMOVE: /* Delete a file. */
parse_arg(esp, 1, argv);
f->eax=remove_handler((void*)argv[0]);
break;
case SYS_OPEN: /* Open a file. */
parse_arg(esp, 1, argv);
f->eax=open_handler((void*)argv[0]);
break;
case SYS_FILESIZE: /* Obtain a file's size. */
parse_arg(esp, 1, argv);
f->eax=filesize_handler((int) argv[0]);
break;
case SYS_READ: /* Read from a file. */
parse_arg(esp, 3, argv);
f->eax=read_handler((int) argv[0], (void*) argv[1], (unsigned) argv[2]);
break;
case SYS_WRITE: /* Write to a file. */
parse_arg(esp, 3, argv);
f->eax=write_handler((int) argv[0], (void*) argv[1], (unsigned) argv[2]);
break;
case SYS_SEEK: /* Change position in a file. */
parse_arg(esp, 2, argv);
seek_handler((int) argv[0], (unsigned) argv[1]);
break;
case SYS_TELL: /* Report current position in a file. */
parse_arg(esp, 1, argv);
f->eax=tell_handler((int) argv[0]);
break;
case SYS_CLOSE: /* Close a file. */
parse_arg(esp, 1, argv);
close_handler((int) argv[0]);
break;
case SYS_MMAP:
parse_arg(esp, 2, argv);
f->eax=mmap_handler ((int) argv[0], (void*)argv[1]);
break;
case SYS_MUNMAP:
parse_arg(esp, 1, argv);
munmap_handler ((mapid_t) argv[0]);
break;
default:
printf("system call %d not implemented!\n", sys_call_num);
}
//thread_exit();
}
static int file_cache_handler(request_rec *r)
{
a_file *match;
int errstatus;
int rc = OK;
/* Bail out if r->handler isn't the default value, and doesn't look like a Content-Type
* XXX: Even though we made the user explicitly list each path to cache?
*/
if (ap_strcmp_match(r->handler, "*/*") && !AP_IS_DEFAULT_HANDLER_NAME(r->handler)) {
return DECLINED;
}
/* we don't handle anything but GET */
if (r->method_number != M_GET) return DECLINED;
/* did xlat phase find the file? */
match = ap_get_module_config(r->request_config, &file_cache_module);
if (match == NULL) {
return DECLINED;
}
/* note that we would handle GET on this resource */
r->allowed |= (AP_METHOD_BIT << M_GET);
/* This handler has no use for a request body (yet), but we still
* need to read and discard it if the client sent one.
*/
if ((errstatus = ap_discard_request_body(r)) != OK)
return errstatus;
ap_update_mtime(r, match->finfo.mtime);
/* ap_set_last_modified() always converts the file mtime to a string
* which is slow. Accelerate the common case.
* ap_set_last_modified(r);
*/
{
apr_time_t mod_time;
char *datestr;
mod_time = ap_rationalize_mtime(r, r->mtime);
if (mod_time == match->finfo.mtime)
datestr = match->mtimestr;
else {
datestr = apr_palloc(r->pool, APR_RFC822_DATE_LEN);
apr_rfc822_date(datestr, mod_time);
}
apr_table_setn(r->headers_out, "Last-Modified", datestr);
}
/* ap_set_content_length() always converts the same number and never
* returns an error. Accelerate it.
*/
r->clength = match->finfo.size;
apr_table_setn(r->headers_out, "Content-Length", match->sizestr);
ap_set_etag(r);
if ((errstatus = ap_meets_conditions(r)) != OK) {
return errstatus;
}
/* Call appropriate handler */
if (!r->header_only) {
if (match->is_mmapped == TRUE)
rc = mmap_handler(r, match);
else
rc = sendfile_handler(r, match);
}
return rc;
}
