94 lines
3.1 KiB
C
94 lines
3.1 KiB
C
/* The kernel call implemented in this file:
|
|
* m_type: SYS_EXIT
|
|
*
|
|
* The parameters for this kernel call are:
|
|
* m1_i1: PR_ENDPT (slot number of exiting process)
|
|
*/
|
|
|
|
#include "../system.h"
|
|
|
|
#include <minix/endpoint.h>
|
|
|
|
#if USE_EXIT
|
|
|
|
FORWARD _PROTOTYPE( void clear_proc, (register struct proc *rc));
|
|
|
|
/*===========================================================================*
|
|
* do_exit *
|
|
*===========================================================================*/
|
|
PUBLIC int do_exit(m_ptr)
|
|
message *m_ptr; /* pointer to request message */
|
|
{
|
|
/* Handle sys_exit. A user process has exited or a system process requests
|
|
* to exit. Only the PM can request other process slots to be cleared.
|
|
* The routine to clean up a process table slot cancels outstanding timers,
|
|
* possibly removes the process from the message queues, and resets certain
|
|
* process table fields to the default values.
|
|
*/
|
|
int exit_e;
|
|
|
|
/* Determine what process exited. User processes are handled here. */
|
|
if (PM_PROC_NR == who_p) {
|
|
if (m_ptr->PR_ENDPT != SELF) { /* PM tries to exit self */
|
|
if(!isokendpt(m_ptr->PR_ENDPT, &exit_e)) /* get exiting process */
|
|
return EINVAL;
|
|
clear_proc(proc_addr(exit_e)); /* exit a user process */
|
|
return(OK); /* report back to PM */
|
|
}
|
|
}
|
|
|
|
/* The PM or some other system process requested to be exited. */
|
|
clear_proc(proc_addr(who_p));
|
|
return(EDONTREPLY);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* clear_proc *
|
|
*===========================================================================*/
|
|
PRIVATE void clear_proc(rc)
|
|
register struct proc *rc; /* slot of process to clean up */
|
|
{
|
|
register struct proc *rp; /* iterate over process table */
|
|
register struct proc **xpp; /* iterate over caller queue */
|
|
int i;
|
|
int sys_id;
|
|
char saved_rts_flags;
|
|
|
|
/* Don't clear if already cleared. */
|
|
if(isemptyp(rc)) return;
|
|
|
|
/* Remove the process' ability to send and receive messages */
|
|
clear_endpoint(rc);
|
|
|
|
/* Turn off any alarm timers at the clock. */
|
|
reset_timer(&priv(rc)->s_alarm_timer);
|
|
|
|
/* Make sure that the exiting process is no longer scheduled. */
|
|
if (rc->p_rts_flags == 0) lock_dequeue(rc);
|
|
|
|
/* Check the table with IRQ hooks to see if hooks should be released. */
|
|
for (i=0; i < NR_IRQ_HOOKS; i++) {
|
|
int proc;
|
|
if (rc->p_endpoint == irq_hooks[i].proc_nr_e) {
|
|
rm_irq_handler(&irq_hooks[i]); /* remove interrupt handler */
|
|
irq_hooks[i].proc_nr_e = NONE; /* mark hook as free */
|
|
}
|
|
}
|
|
|
|
/* Release the process table slot. If this is a system process, also
|
|
* release its privilege structure. Further cleanup is not needed at
|
|
* this point. All important fields are reinitialized when the
|
|
* slots are assigned to another, new process.
|
|
*/
|
|
saved_rts_flags = rc->p_rts_flags;
|
|
rc->p_rts_flags = SLOT_FREE;
|
|
if (priv(rc)->s_flags & SYS_PROC) priv(rc)->s_proc_nr = NONE;
|
|
|
|
/* Clean up virtual memory */
|
|
if (rc->p_misc_flags & MF_VM)
|
|
vm_map_default(rc);
|
|
}
|
|
|
|
#endif /* USE_EXIT */
|
|
|