minix/kernel/system/do_times.c
Tomas Hruby 40f440b8cd KCall methods do not depend on m_source and m_type fields
- substituted the use of the m_source message field by
  caller->p_endpoint in kernel calls. It is the same information, just
  passed more intuitively.
  
- the last dependency on m_type field is removed.
  
- do_unused() is substituted by a check for NULL.

- this pretty much removes the depency of kernel calls on the general
  message format. In the future this may be used to pass the kcall
  arguments in a different structure or registers (x86-64, ARM?) The
  kcall number may be passed in a register already.
2010-06-01 08:54:31 +00:00

43 lines
1.3 KiB
C

/* The kernel call implemented in this file:
* m_type: SYS_TIMES
*
* The parameters for this kernel call are:
* m4_l1: T_ENDPT (get info for this process)
* m4_l1: T_USER_TIME (return values ...)
* m4_l2: T_SYSTEM_TIME
* m4_l3: T_BOOTTIME
* m4_l5: T_BOOT_TICKS
*/
#include "kernel/system.h"
#include <minix/endpoint.h>
#if USE_TIMES
/*===========================================================================*
* do_times *
*===========================================================================*/
PUBLIC int do_times(struct proc * caller, message * m_ptr)
{
/* Handle sys_times(). Retrieve the accounting information. */
register struct proc *rp;
int proc_nr, e_proc_nr;
/* Insert the times needed by the SYS_TIMES kernel call in the message.
* The clock's interrupt handler may run to update the user or system time
* while in this code, but that cannot do any harm.
*/
e_proc_nr = (m_ptr->T_ENDPT == SELF) ? caller->p_endpoint : m_ptr->T_ENDPT;
if(e_proc_nr != NONE && isokendpt(e_proc_nr, &proc_nr)) {
rp = proc_addr(proc_nr);
m_ptr->T_USER_TIME = rp->p_user_time;
m_ptr->T_SYSTEM_TIME = rp->p_sys_time;
}
m_ptr->T_BOOT_TICKS = get_uptime();
m_ptr->T_BOOTTIME = boottime;
return(OK);
}
#endif /* USE_TIMES */