minix/kernel/system/do_times.c
Thomas Cort e67fc5771d libc: add clock_getres()/clock_gettime() system calls.
In order to make it more clear that ticks should be used for timers
and realtime should be used for timestamps / displaying the date/time,
getuptime() was renamed to getticks() and getuptime2() was renamed to
getuptime().

Servers, drivers, libraries, tests, etc that use getuptime()/getuptime2()
have been updated. In instances where a realtime was calculated, the
calculation was changed to use realtime.

System calls clock_getres() and clock_gettime() were added to PM/libc.
2013-04-04 15:04:53 +02:00

45 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 *
*===========================================================================*/
int do_times(struct proc * caller, message * m_ptr)
{
/* Handle sys_times(). Retrieve the accounting information. */
register const struct proc *rp;
int proc_nr;
endpoint_t 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_monotonic();
m_ptr->T_REAL_TICKS = get_realtime();
m_ptr->T_BOOTTIME = boottime;
return(OK);
}
#endif /* USE_TIMES */