minix/servers/pm/time.c

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/* This file takes care of those system calls that deal with time.
*
* The entry points into this file are
* do_getres: perform the CLOCK_GETRES system call
* do_gettime: perform the CLOCK_GETTIME system call
* do_settime: perform the CLOCK_SETTIME system call
* do_time: perform the GETTIMEOFDAY system call
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* do_stime: perform the STIME system call
*/
#include "pm.h"
#include <minix/callnr.h>
#include <minix/com.h>
#include <signal.h>
#include <sys/time.h>
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#include "mproc.h"
/*===========================================================================*
* do_gettime *
*===========================================================================*/
int do_gettime()
{
clock_t ticks, realtime, clock;
time_t boottime;
int s;
if ( (s=getuptime(&ticks, &realtime, &boottime)) != OK)
panic("do_time couldn't get uptime: %d", s);
switch (m_in.PM_TIME_CLK_ID) {
case CLOCK_REALTIME:
clock = realtime;
break;
case CLOCK_MONOTONIC:
clock = ticks;
break;
default:
return EINVAL; /* invalid/unsupported clock_id */
}
mp->mp_reply.PM_TIME_SEC = (time_t) (boottime + (clock / system_hz));
mp->mp_reply.PM_TIME_NSEC =
(long) ((clock % system_hz) * 1000000000ULL / system_hz);
return(OK);
}
/*===========================================================================*
* do_getres *
*===========================================================================*/
int do_getres()
{
switch (m_in.PM_TIME_CLK_ID) {
case CLOCK_REALTIME:
case CLOCK_MONOTONIC:
/* tv_sec is always 0 since system_hz is an int */
mp->mp_reply.PM_TIME_SEC = (time_t) 0;
mp->mp_reply.PM_TIME_NSEC = 1000000000 / system_hz;
return(OK);
default:
return EINVAL; /* invalid/unsupported clock_id */
}
}
/*===========================================================================*
* do_settime *
*===========================================================================*/
int do_settime()
{
int s;
if (mp->mp_effuid != SUPER_USER) {
return(EPERM);
}
switch (m_in.PM_TIME_CLK_ID) {
case CLOCK_REALTIME:
s= sys_settime(m_in.PM_TIME_NOW, m_in.PM_TIME_CLK_ID,
m_in.PM_TIME_SEC, m_in.PM_TIME_NSEC);
return(s);
case CLOCK_MONOTONIC: /* monotonic cannot be changed */
default:
return EINVAL; /* invalid/unsupported clock_id */
}
}
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/*===========================================================================*
* do_time *
*===========================================================================*/
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int do_time()
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{
/* 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 ticks, realtime;
time_t boottime;
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int s;
if ( (s=getuptime(&ticks, &realtime, &boottime)) != OK)
panic("do_time couldn't get uptime: %d", s);
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mp->mp_reply.PM_TIME_SEC = (time_t) (boottime + (realtime / system_hz));
mp->mp_reply.PM_TIME_USEC =
(long) ((realtime % system_hz) * 1000000ULL / system_hz);
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return(OK);
}
/*===========================================================================*
* do_stime *
*===========================================================================*/
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int do_stime()
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{
/* Perform the stime(tp) system call. Retrieve the system's uptime (ticks
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* since boot) and pass the new time in seconds at system boot to the kernel.
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*/
clock_t uptime, realtime;
time_t boottime;
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int s;
if (mp->mp_effuid != SUPER_USER) {
return(EPERM);
}
if ( (s=getuptime(&uptime, &realtime, &boottime)) != OK)
panic("do_stime couldn't get uptime: %d", s);
boottime = (long) m_in.PM_TIME_SEC - (realtime/system_hz);
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s= sys_stime(boottime); /* Tell kernel about boottime */
if (s != OK)
panic("pm: sys_stime failed: %d", s);
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return(OK);
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}