84 lines
2.5 KiB
C
84 lines
2.5 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_time: perform the TIME system call
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* do_stime: perform the STIME system call
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* do_times: perform the TIMES 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 "mproc.h"
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#include "param.h"
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PRIVATE time_t boottime;
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/*===========================================================================*
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* do_time *
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*===========================================================================*/
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PUBLIC 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 uptime;
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int s;
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if ( (s=getuptime(&uptime)) != OK)
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panic(__FILE__,"do_time couldn't get uptime", s);
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mp->mp_reply.reply_time = (time_t) (boottime + (uptime/HZ));
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mp->mp_reply.reply_utime = (uptime%HZ)*1000000/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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PUBLIC 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 store the time in seconds at system boot in the global
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* variable 'boottime'.
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*/
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clock_t uptime;
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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)) != OK)
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panic(__FILE__,"do_stime couldn't get uptime", s);
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boottime = (long) m_in.stime - (uptime/HZ);
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/* Also inform FS about the new system time. */
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tell_fs(STIME, boottime, 0, 0);
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return(OK);
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}
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/*===========================================================================*
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* do_times *
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*===========================================================================*/
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PUBLIC int do_times()
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{
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/* Perform the times(buffer) system call. */
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register struct mproc *rmp = mp;
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clock_t t[5];
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int s;
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if (OK != (s=sys_times(who, t)))
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panic(__FILE__,"do_times couldn't get times", s);
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rmp->mp_reply.reply_t1 = t[0]; /* user time */
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rmp->mp_reply.reply_t2 = t[1]; /* system time */
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rmp->mp_reply.reply_t3 = rmp->mp_child_utime; /* child user time */
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rmp->mp_reply.reply_t4 = rmp->mp_child_stime; /* child system time */
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rmp->mp_reply.reply_t5 = t[4]; /* uptime since boot */
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return(OK);
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}
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