dist/ntp/util/timetrim.c

   1 /*      $NetBSD$        */
   2
   3 #if defined(sgi) || defined(_UNICOSMP)
   4 /*
   5  * timetrim.c
   6  *
   7  * "timetrim" allows setting and adjustment of the system clock frequency
   8  * trim parameter on Silicon Graphics machines.  The trim value native
   9  * units are nanoseconds per second (10**-9), so a trim value of 1 makes
  10  * the system clock step ahead 1 nanosecond more per second than a value
  11  * of zero.  Xntpd currently uses units of 2**-20 secs for its frequency
  12  * offset (drift) values; to convert to a timetrim value, multiply by
  13  * 1E9 / 2**20 (about 954).
  14  *
  15  * "timetrim" with no arguments just prints out the current kernel value.
  16  * With a numeric argument, the kernel value is set to the supplied value.
  17  * The "-i" flag causes the supplied value to be added to the kernel value.
  18  * The "-n" option causes all input and output to be in xntpd units rather
  19  * than timetrim native units.
  20  *
  21  * Note that there is a limit of +-3000000 (0.3%) on the timetrim value
  22  * which is (silently?) enforced by the kernel.
  23  *
  24  */
  25
  26 #ifdef HAVE_CONFIG_H
  27 #include <config.h>
  28 #endif
  29
  30 #include <stdio.h>
  31 #include <ctype.h>
  32 #include <stdlib.h>
  33 #ifdef HAVE_SYS_SYSSGI_H
  34 # include <sys/syssgi.h>
  35 #endif
  36 #ifdef HAVE_SYS_SYSTUNE_H
  37 # include <sys/systune.h>
  38 #endif
  39
  40 #define abs(X) (((X) < 0) ? -(X) : (X))
  41 #define USAGE "usage: timetrim [-n] [[-i] value]\n"
  42 #define SGITONTP(X) ((double)(X) * 1048576.0/1.0e9)
  43 #define NTPTOSGI(X) ((long)((X) * 1.0e9/1048576.0))
  44
  45 int
  46 main(
  47         int argc,
  48         char *argv[]
  49         )
  50 {
  51         char *rem;
  52         int incremental = 0, ntpunits = 0;
  53         long timetrim;
  54         double value;
  55
  56         while (--argc && **++argv == '-' && isalpha((int)argv[0][1])) {
  57                 switch (argv[0][1]) {
  58                     case 'i':
  59                         incremental++;
  60                         break;
  61                     case 'n':
  62                         ntpunits++;
  63                         break;
  64                     default:
  65                         fprintf(stderr, USAGE);
  66                         exit(1);
  67                 }
  68         }
  69
  70 #ifdef HAVE_SYS_SYSSGI_H
  71         if (syssgi(SGI_GETTIMETRIM, &timetrim) < 0) {
  72                 perror("syssgi");
  73                 exit(2);
  74         }
  75 #endif
  76 #ifdef HAVE_SYS_SYSTUNE_H
  77         if (systune(SYSTUNE_GET, "timetrim", &timetrim) < 0) {
  78                 perror("systune");
  79                 exit(2);
  80         }
  81 #endif
  82
  83         if (argc == 0) {
  84                 if (ntpunits)
  85                     fprintf(stdout, "%0.5f\n", SGITONTP(timetrim));
  86                 else
  87                     fprintf(stdout, "%ld\n", timetrim);
  88         } else if (argc != 1) {
  89                 fprintf(stderr, USAGE);
  90                 exit(1);
  91         } else {
  92                 value = strtod(argv[0], &rem);
  93                 if (*rem != '\0') {
  94                         fprintf(stderr, USAGE);
  95                         exit(1);
  96                 }
  97                 if (ntpunits)
  98                     value = NTPTOSGI(value);
  99                 if (incremental)
 100                     timetrim += value;
 101                 else
 102                     timetrim = value;
 103 #ifdef HAVE_SYS_SYSSGI_H
 104                 if (syssgi(SGI_SETTIMETRIM, timetrim) < 0) {
 105                         perror("syssgi");
 106                         exit(2);
 107                 }
 108 #endif
 109 #ifdef HAVE_SYS_SYSTUNE_H
 110                 if (systune(SYSTUNE_SET, "timer", "timetrim", &timetrim) < 0) {
 111                         perror("systune");
 112                         exit(2);
 113                 }
 114 #endif
 115         }
 116         return 0;
 117 }
 118 #endif