minix/servers/pm/time.c
Thomas Cort 15b3d77268 libc: add adjtime() system call.
Implement the adjtime() system call and add a test for it to test69.
Additionally, install the adjtime.2 and clock_*.2 man pages.
2013-04-04 15:04:54 +02:00

156 lines
4.6 KiB
C

/* 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 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 <sys/time.h>
#include "mproc.h"
#include "param.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.clk_id) {
case CLOCK_REALTIME:
clock = realtime;
break;
case CLOCK_MONOTONIC:
clock = ticks;
break;
default:
return EINVAL; /* invalid/unsupported clock_id */
}
mp->mp_reply.reply_time = (time_t) (boottime + (clock / system_hz));
mp->mp_reply.reply_ntime = (clock % system_hz) * 1000000000 / system_hz;
return(OK);
}
/*===========================================================================*
* do_getres *
*===========================================================================*/
int do_getres()
{
switch (m_in.clk_id) {
case CLOCK_REALTIME:
case CLOCK_MONOTONIC:
/* tv_sec is always 0 since system_hz is an int */
mp->mp_reply.reply_time = (time_t) 0;
mp->mp_reply.reply_ntime = 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.clk_id) {
case CLOCK_REALTIME:
s= sys_settime(m_in.settime_now, m_in.clk_id, m_in.time_sec,
m_in.time_nsec);
return(s);
case CLOCK_MONOTONIC: /* monotonic cannot be changed */
default:
return EINVAL; /* invalid/unsupported clock_id */
}
}
/*===========================================================================*
* do_time *
*===========================================================================*/
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 ticks, realtime;
time_t boottime;
int s;
if ( (s=getuptime(&ticks, &realtime, &boottime)) != OK)
panic("do_time couldn't get uptime: %d", s);
mp->mp_reply.reply_time = (time_t) (boottime + (realtime / system_hz));
mp->mp_reply.reply_utime = (realtime % system_hz) * 1000000 / system_hz;
return(OK);
}
/*===========================================================================*
* do_stime *
*===========================================================================*/
int do_stime()
{
/* Perform the stime(tp) system call. Retrieve the system's uptime (ticks
* since boot) and pass the new time in seconds at system boot to the kernel.
*/
clock_t uptime, realtime;
time_t boottime;
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.stime - (realtime/system_hz);
s= sys_stime(boottime); /* Tell kernel about boottime */
if (s != OK)
panic("pm: sys_stime failed: %d", s);
return(OK);
}
/*===========================================================================*
* do_times *
*===========================================================================*/
int do_times()
{
/* Perform the times(buffer) system call. */
register struct mproc *rmp = mp;
clock_t user_time, sys_time, uptime;
int s;
if (OK != (s=sys_times(who_e, &user_time, &sys_time, &uptime, NULL)))
panic("do_times couldn't get times: %d", s);
rmp->mp_reply.reply_t1 = user_time; /* user time */
rmp->mp_reply.reply_t2 = sys_time; /* 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 = uptime; /* uptime since boot */
return(OK);
}