diff options
Diffstat (limited to 'usr.sbin/xntpd/util/timetrim.c')
-rw-r--r-- | usr.sbin/xntpd/util/timetrim.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/usr.sbin/xntpd/util/timetrim.c b/usr.sbin/xntpd/util/timetrim.c new file mode 100644 index 0000000..052a587 --- /dev/null +++ b/usr.sbin/xntpd/util/timetrim.c @@ -0,0 +1,85 @@ +/* + * timetrim.c,v 3.1 1993/07/06 01:11:06 jbj Exp + * + * "timetrim" allows setting and adjustment of the system clock frequency + * trim parameter on Silicon Graphics machines. The trim value native + * units are nanoseconds per second (10**-9), so a trim value of 1 makes + * the system clock step ahead 1 nanosecond more per second than a value + * of zero. Xntpd currently uses units of 2**-20 secs for its frequency + * offset (drift) values; to convert to a timetrim value, multiply by + * 1E9 / 2**20 (about 954). + * + * "timetrim" with no arguments just prints out the current kernel value. + * With a numeric argument, the kernel value is set to the supplied value. + * The "-i" flag causes the supplied value to be added to the kernel value. + * The "-n" option causes all input and output to be in xntpd units rather + * than timetrim native units. + * + * Note that there is a limit of +-3000000 (0.3%) on the timetrim value + * which is (silently?) enforced by the kernel. + * + */ + +#include <stdio.h> +#include <ctype.h> +#include <sys/syssgi.h> + +#define abs(X) (((X) < 0) ? -(X) : (X)) +#define USAGE "usage: timetrim [-n] [[-i] value]\n" +#define SGITONTP(X) ((double)(X) * 1048576.0/1.0e9) +#define NTPTOSGI(X) ((LONG)((X) * 1.0e9/1048576.0)) + +main(argc, argv) +int argc; +char **argv; +{ + char *rem; + int c, incremental = 0, ntpunits = 0; + LONG timetrim; + double value, strtod(); + + while (--argc && **++argv == '-' && isalpha(argv[0][1])) { + switch (argv[0][1]) { + case 'i': + incremental++; + break; + case 'n': + ntpunits++; + break; + default: + fprintf(stderr, USAGE); + exit(1); + } + } + + if (syssgi(SGI_GETTIMETRIM, &timetrim) < 0) { + perror("syssgi"); + exit(2); + } + + if (argc == 0) { + if (ntpunits) + fprintf(stdout, "%0.5lf\n", SGITONTP(timetrim)); + else + fprintf(stdout, "%ld\n", timetrim); + } else if (argc != 1) { + fprintf(stderr, USAGE); + exit(1); + } else { + value = strtod(argv[0], &rem); + if (*rem != '\0') { + fprintf(stderr, USAGE); + exit(1); + } + if (ntpunits) + value = NTPTOSGI(value); + if (incremental) + timetrim += value; + else + timetrim = value; + if (syssgi(SGI_SETTIMETRIM, timetrim) < 0) { + perror("syssgi"); + exit(2); + } + } +} |