void root( void ) {
/****************************/
int i, j;
kprintf("Root has been called\n");
sysyield();
sysyield();
syscreate( &producer, 4096 );
syscreate( &consumer, 4096 );
for( ;; ) {
sysyield();
}
}
/* read a message into a temp file, return an open fd to it in mp->fd */
static int
m_read_to_file(Biobuf *fp, message *mp)
{
int fd;
int n;
String *file;
char buf[4*1024];
file = s_new();
/*
* create temp file to be removed on close
*/
abspath("mtXXXXXX", UPASTMP, file);
mktemp(s_to_c(file));
if((fd = syscreate(s_to_c(file), ORDWR|ORCLOSE, 0600))<0){
s_free(file);
return -1;
}
mp->tmp = file;
/*
* read the rest into the temp file
*/
while((n = Bread(fp, buf, sizeof(buf))) > 0){
if(write(fd, buf, n) != n){
close(fd);
return -1;
}
mp->size += n;
if(mp->size > MSGLIMIT){
mp->size = -1;
break;
}
}
mp->fd = fd;
return 0;
}
static void
syscall_handler (struct intr_frame* frame)
{
// -------- System Call Handler Overview --------
// Get system call number
// switch statement using system call number
// collect arguments for system call function if necessary
// call system call function
// set frame->eax to return value if necessary
// ----------------------------------------------
uintptr_t* kpaddr_sp = (uintptr_t*) frame->esp;
int syscall_num = -1;
if(check_uptr(kpaddr_sp))
syscall_num = next_value(&kpaddr_sp);
else
sysexit(-1);
switch(syscall_num)
{
case SYS_HALT:
{
// Terminates Pintos
shutdown_power_off();
}
break;
case SYS_EXIT:
{
uintptr_t status = -1;
if(check_uptr(kpaddr_sp))
status = next_value(&kpaddr_sp);
sysexit(status);
}
break;
case SYS_EXEC: //pid_t exec (const char *file);
{
const char* file = next_charptr(&kpaddr_sp);
if(file == NULL)
sysexit(-1);
unsigned len = strlen(file);
if(!check_buffer(file, len))
sysexit(-1);
else
sysexec(frame, file);
}
break;
case SYS_WAIT: //int wait (pid_t);
{
uintptr_t childid = -1;
if(check_uptr(kpaddr_sp))
childid = next_value(&kpaddr_sp);
else
sysexit(childid);
int retval = process_wait((tid_t) childid);
frame->eax = retval;
}
break;
case SYS_CREATE: //bool create (const char *file, unsigned initial_size);
{
const char* file = next_charptr(&kpaddr_sp);
if(file == NULL)
sysexit(-1);
unsigned len = strlen(file);
if(!check_buffer(file, len))
sysexit(-1);
uintptr_t size = 0;
if(check_uptr(kpaddr_sp))
size = next_value(&kpaddr_sp);
else
sysexit(-1);
syscreate(frame, file, size);
}
break;
case SYS_REMOVE: //bool remove (const char *file);
{
const char* file = next_charptr(&kpaddr_sp);
if(file == NULL)
sysexit(-1);
unsigned len = strlen(file);
if(!check_buffer(file, len))
sysexit(-1);
sysremove(frame, file);
}
break;
case SYS_OPEN:
{
//int open (const char *file);
const char* file = next_charptr(&kpaddr_sp);
if(file == NULL)
sysexit(-1);
unsigned len = strlen(file);
if(!check_buffer(file, len))
sysexit(-1);
sysopen(frame, file);
}
break;
case SYS_FILESIZE:
{
//int filesize (int fd);
int fd = 0;
if (check_uptr(kpaddr_sp))
fd = (int) next_value(&kpaddr_sp);
else
sysexit(-1);
sysfilesize(frame, fd);
}
break;
case SYS_READ:
{
//int read (int fd, void *buffer, unsigned length);
int fd = 0;
if (check_uptr(kpaddr_sp))
fd = (int) next_value(&kpaddr_sp);
else
sysexit(-1);
const char* file = next_charptr(&kpaddr_sp);
if(file == NULL)
sysexit(-1);
unsigned len = strlen(file);
if(!check_buffer(file, len))
sysexit(-1);
unsigned length = 0;
if (check_uptr(kpaddr_sp))
length = (unsigned) next_value(&kpaddr_sp);
else
sysexit(-1);
sysread(frame, fd, (void*) file, length);
}
break;
case SYS_WRITE:
{
//int write (int fd, const void *buffer, unsigned length);
uintptr_t fd = 0;
if(check_uptr(kpaddr_sp))
fd = next_value(&kpaddr_sp);
else
sysexit(-1);
const char* file = next_charptr(&kpaddr_sp);
if(file == NULL)
sysexit(-1);
unsigned len = strlen(file);
if(!check_buffer(file, len))
sysexit(-1);
uintptr_t length = 0;
if(check_uptr(kpaddr_sp))
length = next_value(&kpaddr_sp);
else
sysexit(-1);
if(fd == CONSOLEWRITE) // Write to Console
{
while(length > 0)
{
if(length > MAX_SIZE)
{
putbuf (file, MAX_SIZE);
file += MAX_SIZE;
length -= MAX_SIZE;
}
else
{
putbuf (file, length);
length = 0;
}
}
}
else
{
syswrite(frame, fd, file, length);
}
}
break;
case SYS_SEEK:
{
//void seek (int fd, unsigned position);
int fd = 0;
if (check_uptr(kpaddr_sp))
fd = (int) next_value(&kpaddr_sp);
else
sysexit(-1);
unsigned position = 0;
if (check_uptr(kpaddr_sp))
position = (unsigned) next_value(&kpaddr_sp);
else
sysexit(-1);
sysseek(fd, position);
}
break;
case SYS_TELL:
{
//unsigned tell (int fd);
int fd = 0;
if (check_uptr(kpaddr_sp))
fd = (int) next_value(&kpaddr_sp);
else
sysexit(-1);
systell(frame, fd);
}
break;
case SYS_CLOSE:
{
//void close (int fd);
int fd = 0;
if (check_uptr(kpaddr_sp))
fd = (int) next_value(&kpaddr_sp);
else
sysexit(-1);
sysclose(fd);
}
break;
default:
{
printf("Unrecognized System Call\n");
sysexit(-1);
}
break;
}
}
