minix/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  *   m_lsys_krn_sys_times.endpt         (get info for this process)
   6  *   m_krn_lsys_sys_times.user_time     (return values ...)
   7  *   m_krn_lsys_sys_times.system_time
   8  *   m_krn_lsys_sys_times.boot_time
   9  *   m_krn_lsys_sys_times.boot_ticks
  10  *   m_krn_lsys_sys_times.real_ticks
  11  */
  12
  13 #include "kernel/system.h"
  14
  15 #include <minix/endpoint.h>
  16
  17 #if USE_TIMES
  18
  19 /*===========================================================================*
  20  *                              do_times                                     *
  21  *===========================================================================*/
  22 int do_times(struct proc * caller, message * m_ptr)
  23 {
  24 /* Handle sys_times().  Retrieve the accounting information. */
  25   register const struct proc *rp;
  26   int proc_nr;
  27   endpoint_t e_proc_nr;
  28
  29   /* Insert the times needed by the SYS_TIMES kernel call in the message.
  30    * The clock's interrupt handler may run to update the user or system time
  31    * while in this code, but that cannot do any harm.
  32    */
  33   e_proc_nr = (m_ptr->m_lsys_krn_sys_times.endpt == SELF) ?
  34       caller->p_endpoint : m_ptr->m_lsys_krn_sys_times.endpt;
  35   if(e_proc_nr != NONE && isokendpt(e_proc_nr, &proc_nr)) {
  36       rp = proc_addr(proc_nr);
  37       m_ptr->m_krn_lsys_sys_times.user_time   = rp->p_user_time;
  38       m_ptr->m_krn_lsys_sys_times.system_time = rp->p_sys_time;
  39   }
  40   m_ptr->m_krn_lsys_sys_times.boot_ticks = get_monotonic();
  41   m_ptr->m_krn_lsys_sys_times.real_ticks = get_realtime();
  42   m_ptr->m_krn_lsys_sys_times.boot_time = get_boottime();
  43   return(OK);
  44 }
  45
  46 #endif /* USE_TIMES */