Annotation of embedaddon/ntp/util/timetrim.c, revision 1.1.1.1
1.1 misho 1: #if defined(sgi) || defined(_UNICOSMP)
2: /*
3: * timetrim.c
4: *
5: * "timetrim" allows setting and adjustment of the system clock frequency
6: * trim parameter on Silicon Graphics machines. The trim value native
7: * units are nanoseconds per second (10**-9), so a trim value of 1 makes
8: * the system clock step ahead 1 nanosecond more per second than a value
9: * of zero. Xntpd currently uses units of 2**-20 secs for its frequency
10: * offset (drift) values; to convert to a timetrim value, multiply by
11: * 1E9 / 2**20 (about 954).
12: *
13: * "timetrim" with no arguments just prints out the current kernel value.
14: * With a numeric argument, the kernel value is set to the supplied value.
15: * The "-i" flag causes the supplied value to be added to the kernel value.
16: * The "-n" option causes all input and output to be in xntpd units rather
17: * than timetrim native units.
18: *
19: * Note that there is a limit of +-3000000 (0.3%) on the timetrim value
20: * which is (silently?) enforced by the kernel.
21: *
22: */
23:
24: #ifdef HAVE_CONFIG_H
25: #include <config.h>
26: #endif
27:
28: #include <stdio.h>
29: #include <ctype.h>
30: #include <stdlib.h>
31: #ifdef HAVE_SYS_SYSSGI_H
32: # include <sys/syssgi.h>
33: #endif
34: #ifdef HAVE_SYS_SYSTUNE_H
35: # include <sys/systune.h>
36: #endif
37:
38: #define abs(X) (((X) < 0) ? -(X) : (X))
39: #define USAGE "usage: timetrim [-n] [[-i] value]\n"
40: #define SGITONTP(X) ((double)(X) * 1048576.0/1.0e9)
41: #define NTPTOSGI(X) ((long)((X) * 1.0e9/1048576.0))
42:
43: int
44: main(
45: int argc,
46: char *argv[]
47: )
48: {
49: char *rem;
50: int incremental = 0, ntpunits = 0;
51: long timetrim;
52: double value;
53:
54: while (--argc && **++argv == '-' && isalpha((int)argv[0][1])) {
55: switch (argv[0][1]) {
56: case 'i':
57: incremental++;
58: break;
59: case 'n':
60: ntpunits++;
61: break;
62: default:
63: fprintf(stderr, USAGE);
64: exit(1);
65: }
66: }
67:
68: #ifdef HAVE_SYS_SYSSGI_H
69: if (syssgi(SGI_GETTIMETRIM, &timetrim) < 0) {
70: perror("syssgi");
71: exit(2);
72: }
73: #endif
74: #ifdef HAVE_SYS_SYSTUNE_H
75: if (systune(SYSTUNE_GET, "timetrim", &timetrim) < 0) {
76: perror("systune");
77: exit(2);
78: }
79: #endif
80:
81: if (argc == 0) {
82: if (ntpunits)
83: fprintf(stdout, "%0.5f\n", SGITONTP(timetrim));
84: else
85: fprintf(stdout, "%ld\n", timetrim);
86: } else if (argc != 1) {
87: fprintf(stderr, USAGE);
88: exit(1);
89: } else {
90: value = strtod(argv[0], &rem);
91: if (*rem != '\0') {
92: fprintf(stderr, USAGE);
93: exit(1);
94: }
95: if (ntpunits)
96: value = NTPTOSGI(value);
97: if (incremental)
98: timetrim += value;
99: else
100: timetrim = value;
101: #ifdef HAVE_SYS_SYSSGI_H
102: if (syssgi(SGI_SETTIMETRIM, timetrim) < 0) {
103: perror("syssgi");
104: exit(2);
105: }
106: #endif
107: #ifdef HAVE_SYS_SYSTUNE_H
108: if (systune(SYSTUNE_SET, "timer", "timetrim", &timetrim) < 0) {
109: perror("systune");
110: exit(2);
111: }
112: #endif
113: }
114: return 0;
115: }
116: #endif
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