minix/servers/pm/time.c
2005-09-11 16:45:46 +00:00

84 lines
2.5 KiB
C

/* This file takes care of those system calls that deal with time.
*
* The entry points into this file are
* do_time: perform the TIME system call
* do_stime: perform the STIME system call
* do_times: perform the TIMES system call
*/
#include "pm.h"
#include <minix/callnr.h>
#include <minix/com.h>
#include <signal.h>
#include "mproc.h"
#include "param.h"
PRIVATE time_t boottime;
/*===========================================================================*
* do_time *
*===========================================================================*/
PUBLIC int do_time()
{
/* Perform the time(tp) system call. This returns the time in seconds since
* 1.1.1970. MINIX is an astrophysically naive system that assumes the earth
* rotates at a constant rate and that such things as leap seconds do not
* exist.
*/
clock_t uptime;
int s;
if ( (s=getuptime(&uptime)) != OK)
panic(__FILE__,"do_time couldn't get uptime", s);
mp->mp_reply.reply_time = (time_t) (boottime + (uptime/HZ));
mp->mp_reply.reply_utime = (uptime%HZ)*1000000/HZ;
return(OK);
}
/*===========================================================================*
* do_stime *
*===========================================================================*/
PUBLIC int do_stime()
{
/* Perform the stime(tp) system call. Retrieve the system's uptime (ticks
* since boot) and store the time in seconds at system boot in the global
* variable 'boottime'.
*/
clock_t uptime;
int s;
if (mp->mp_effuid != SUPER_USER) {
return(EPERM);
}
if ( (s=getuptime(&uptime)) != OK)
panic(__FILE__,"do_stime couldn't get uptime", s);
boottime = (long) m_in.stime - (uptime/HZ);
/* Also inform FS about the new system time. */
tell_fs(STIME, boottime, 0, 0);
return(OK);
}
/*===========================================================================*
* do_times *
*===========================================================================*/
PUBLIC int do_times()
{
/* Perform the times(buffer) system call. */
register struct mproc *rmp = mp;
clock_t t[5];
int s;
if (OK != (s=sys_times(who, t)))
panic(__FILE__,"do_times couldn't get times", s);
rmp->mp_reply.reply_t1 = t[0]; /* user time */
rmp->mp_reply.reply_t2 = t[1]; /* system time */
rmp->mp_reply.reply_t3 = rmp->mp_child_utime; /* child user time */
rmp->mp_reply.reply_t4 = rmp->mp_child_stime; /* child system time */
rmp->mp_reply.reply_t5 = t[4]; /* uptime since boot */
return(OK);
}