kernel/system/do_times.c

   1 /* The kernel call implemented in this file:
   2  *   m_type:    SYS_TIMES
   3  *
   4  * The parameters for this kernel call are:
   5  *    m4_l1:    T_ENDPT         (get info for this process)
   6  *    m4_l1:    T_USER_TIME             (return values ...)
   7  *    m4_l2:    T_SYSTEM_TIME
   8  *    m4_l3:    T_BOOTTIME
   9  *    m4_l5:    T_BOOT_TICKS
  10  */
  11
  12 #include "kernel/system.h"
  13
  14 #include <minix/endpoint.h>
  15
  16 #if USE_TIMES
  17
  18 /*===========================================================================*
  19  *                              do_times                                     *
  20  *===========================================================================*/
  21 int do_times(struct proc * caller, message * m_ptr)
  22 {
  23 /* Handle sys_times().  Retrieve the accounting information. */
  24   register const struct proc *rp;
  25   int proc_nr;
  26   endpoint_t e_proc_nr;
  27
  28   /* Insert the times needed by the SYS_TIMES kernel call in the message.
  29    * The clock's interrupt handler may run to update the user or system time
  30    * while in this code, but that cannot do any harm.
  31    */
  32   e_proc_nr = (m_ptr->T_ENDPT == SELF) ? caller->p_endpoint : m_ptr->T_ENDPT;
  33   if(e_proc_nr != NONE && isokendpt(e_proc_nr, &proc_nr)) {
  34       rp = proc_addr(proc_nr);
  35       m_ptr->T_USER_TIME   = rp->p_user_time;
  36       m_ptr->T_SYSTEM_TIME = rp->p_sys_time;
  37   }
  38   m_ptr->T_BOOT_TICKS = get_uptime();
  39   m_ptr->T_BOOTTIME = boottime;
  40   return(OK);
  41 }
  42
  43 #endif /* USE_TIMES */
  44