135 lines
3.8 KiB
C
135 lines
3.8 KiB
C
/* This file takes care of those system calls that deal with time.
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*
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* The entry points into this file are
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* do_getres: perform the CLOCK_GETRES system call
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* do_gettime: perform the CLOCK_GETTIME system call
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* do_settime: perform the CLOCK_SETTIME system call
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* do_time: perform the GETTIMEOFDAY system call
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* do_stime: perform the STIME system call
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*/
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#include "pm.h"
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#include <minix/callnr.h>
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#include <minix/com.h>
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#include <signal.h>
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#include <sys/time.h>
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#include "mproc.h"
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/*===========================================================================*
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* do_gettime *
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*===========================================================================*/
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int do_gettime()
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{
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clock_t ticks, realtime, clock;
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time_t boottime;
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int s;
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if ( (s=getuptime(&ticks, &realtime, &boottime)) != OK)
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panic("do_time couldn't get uptime: %d", s);
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switch (m_in.PM_TIME_CLK_ID) {
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case CLOCK_REALTIME:
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clock = realtime;
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break;
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case CLOCK_MONOTONIC:
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clock = ticks;
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break;
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default:
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return EINVAL; /* invalid/unsupported clock_id */
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}
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mp->mp_reply.PM_TIME_SEC = boottime + (clock / system_hz);
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mp->mp_reply.PM_TIME_NSEC =
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(uint32_t) ((clock % system_hz) * 1000000000ULL / system_hz);
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return(OK);
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}
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/*===========================================================================*
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* do_getres *
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*===========================================================================*/
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int do_getres()
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{
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switch (m_in.PM_TIME_CLK_ID) {
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case CLOCK_REALTIME:
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case CLOCK_MONOTONIC:
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/* tv_sec is always 0 since system_hz is an int */
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mp->mp_reply.PM_TIME_SEC = 0;
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mp->mp_reply.PM_TIME_NSEC = 1000000000 / system_hz;
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return(OK);
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default:
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return EINVAL; /* invalid/unsupported clock_id */
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}
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}
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/*===========================================================================*
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* do_settime *
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*===========================================================================*/
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int do_settime()
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{
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int s;
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if (mp->mp_effuid != SUPER_USER) {
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return(EPERM);
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}
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switch (m_in.PM_TIME_CLK_ID) {
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case CLOCK_REALTIME:
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s= sys_settime(m_in.PM_TIME_NOW, m_in.PM_TIME_CLK_ID,
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m_in.PM_TIME_SEC, m_in.PM_TIME_NSEC);
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return(s);
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case CLOCK_MONOTONIC: /* monotonic cannot be changed */
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default:
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return EINVAL; /* invalid/unsupported clock_id */
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}
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}
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/*===========================================================================*
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* do_time *
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*===========================================================================*/
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int do_time()
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{
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/* Perform the time(tp) system call. This returns the time in seconds since
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* 1.1.1970. MINIX is an astrophysically naive system that assumes the earth
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* rotates at a constant rate and that such things as leap seconds do not
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* exist.
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*/
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clock_t ticks, realtime;
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time_t boottime;
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int s;
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if ( (s=getuptime(&ticks, &realtime, &boottime)) != OK)
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panic("do_time couldn't get uptime: %d", s);
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mp->mp_reply.PM_TIME_SEC = boottime + (realtime / system_hz);
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mp->mp_reply.PM_TIME_USEC =
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(uint32_t) ((realtime % system_hz) * 1000000ULL / system_hz);
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return(OK);
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}
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/*===========================================================================*
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* do_stime *
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*===========================================================================*/
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int do_stime()
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{
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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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*/
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clock_t uptime, realtime;
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time_t boottime;
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int s;
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if (mp->mp_effuid != SUPER_USER) {
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return(EPERM);
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}
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if ( (s=getuptime(&uptime, &realtime, &boottime)) != OK)
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panic("do_stime couldn't get uptime: %d", s);
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boottime = m_in.PM_TIME_SEC - (realtime/system_hz);
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s= sys_stime(boottime); /* Tell kernel about boottime */
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if (s != OK)
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panic("pm: sys_stime failed: %d", s);
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return(OK);
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}
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