| 1 | /* This file takes care of those system calls that deal with time.
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| 2 | *
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| 3 | * The entry points into this file are
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| 4 | * do_time: perform the TIME system call
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| 5 | * do_stime: perform the STIME system call
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| 6 | * do_times: perform the TIMES system call
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| 7 | */
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| 8 |
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| 9 | #include "pm.h"
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| 10 | #include <minix/callnr.h>
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| 11 | #include <minix/com.h>
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| 12 | #include <signal.h>
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| 13 | #include "mproc.h"
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| 14 | #include "param.h"
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| 15 |
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| 16 | PRIVATE time_t boottime;
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| 17 |
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| 18 | /*===========================================================================*
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| 19 | * do_time *
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| 20 | *===========================================================================*/
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| 21 | PUBLIC int do_time()
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| 22 | {
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| 23 | /* Perform the time(tp) system call. This returns the time in seconds since
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| 24 | * 1.1.1970. MINIX is an astrophysically naive system that assumes the earth
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| 25 | * rotates at a constant rate and that such things as leap seconds do not
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| 26 | * exist.
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| 27 | */
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| 28 | clock_t uptime;
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| 29 | int s;
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| 30 |
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| 31 | if ( (s=getuptime(&uptime)) != OK)
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| 32 | panic(__FILE__,"do_time couldn't get uptime", s);
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| 33 |
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| 34 | mp->mp_reply.reply_time = (time_t) (boottime + (uptime/HZ));
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| 35 | mp->mp_reply.reply_utime = (uptime%HZ)*1000000/HZ;
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| 36 | return(OK);
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| 37 | }
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| 38 |
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| 39 | /*===========================================================================*
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| 40 | * do_stime *
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| 41 | *===========================================================================*/
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| 42 | PUBLIC int do_stime()
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| 43 | {
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| 44 | /* Perform the stime(tp) system call. Retrieve the system's uptime (ticks
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| 45 | * since boot) and store the time in seconds at system boot in the global
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| 46 | * variable 'boottime'.
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| 47 | */
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| 48 | clock_t uptime;
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| 49 | int s;
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| 50 |
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| 51 | if (mp->mp_effuid != SUPER_USER) {
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| 52 | return(EPERM);
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| 53 | }
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| 54 | if ( (s=getuptime(&uptime)) != OK)
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| 55 | panic(__FILE__,"do_stime couldn't get uptime", s);
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| 56 | boottime = (long) m_in.stime - (uptime/HZ);
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| 57 |
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| 58 | /* Also inform FS about the new system time. */
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| 59 | tell_fs(STIME, boottime, 0, 0);
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| 60 |
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| 61 | return(OK);
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| 62 | }
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| 63 |
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| 64 | /*===========================================================================*
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| 65 | * do_times *
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| 66 | *===========================================================================*/
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| 67 | PUBLIC int do_times()
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| 68 | {
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| 69 | /* Perform the times(buffer) system call. */
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| 70 | register struct mproc *rmp = mp;
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| 71 | clock_t t[5];
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| 72 | int s;
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| 73 |
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| 74 | if (OK != (s=sys_times(who_e, t)))
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| 75 | panic(__FILE__,"do_times couldn't get times", s);
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| 76 | rmp->mp_reply.reply_t1 = t[0]; /* user time */
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| 77 | rmp->mp_reply.reply_t2 = t[1]; /* system time */
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| 78 | rmp->mp_reply.reply_t3 = rmp->mp_child_utime; /* child user time */
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| 79 | rmp->mp_reply.reply_t4 = rmp->mp_child_stime; /* child system time */
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| 80 | rmp->mp_reply.reply_t5 = t[4]; /* uptime since boot */
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| 81 |
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| 82 | return(OK);
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| 83 | }
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| 84 |
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