minix/kernel/system/do_exit.c
Jorrit Herder 42ab148155 Reorganized system call library; uses separate file per call now.
New configuration header file to include/ exclude functionality.
Extracted privileged features from struct proc and create new struct priv.
Renamed various system calls for readability.
2005-07-14 15:12:12 +00:00

42 lines
1.4 KiB
C

/* The system call implemented in this file:
* m_type: SYS_EXIT
*
* The parameters for this system call are:
* m1_i1: PR_PROC_NR (slot number of exiting process)
*/
#include "../system.h"
#if USE_EXIT
/*===========================================================================*
* 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_proc_nr;
/* Determine what process exited. User processes are handled here. */
if (PM_PROC_NR == m_ptr->m_source) {
exit_proc_nr = m_ptr->PR_PROC_NR; /* get exiting process */
if (exit_proc_nr != SELF) { /* PM tries to exit self */
if (! isokprocn(exit_proc_nr)) return(EINVAL);
clear_proc(exit_proc_nr); /* exit a user process */
return(OK); /* report back to PM */
}
}
/* The PM or some other system process requested to be exited. */
clear_proc(m_ptr->m_source);
return(EDONTREPLY);
}
#endif /* USE_EXIT */