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Diffstat (limited to 'adjtimex.c')
| -rw-r--r-- | adjtimex.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/adjtimex.c b/adjtimex.c new file mode 100644 index 000000000..02b6e89b0 --- /dev/null +++ b/adjtimex.c @@ -0,0 +1,169 @@ +/* + * adjtimex.c - read, and possibly modify, the Linux kernel `timex' variables. + * + * Originally written: October 1997 + * Last hack: March 2001 + * Copyright 1997, 2000, 2001 Larry Doolittle <LRDoolittle@lbl.gov> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License (Version 2, + * June 1991) as published by the Free Software Foundation. At the + * time of writing, that license was published by the FSF with the URL + * http://www.gnu.org/copyleft/gpl.html, and is incorporated herein by + * reference. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * This adjtimex(1) is very similar in intent to adjtimex(8) by Steven + * Dick <ssd@nevets.oau.org> and Jim Van Zandt <jrv@vanzandt.mv.com> + * (see http://metalab.unc.edu/pub/Linux/system/admin/time/adjtimex*). + * That version predates this one, and is _much_ bigger and more + * featureful. My independently written version was very similar to + * Steven's from the start, because they both follow the kernel timex + * structure. I further tweaked this version to be equivalent to Steven's + * where possible, but I don't like getopt_long, so the actual usage + * syntax is incompatible. + * + * Amazingly enough, my Red Hat 5.2 sys/timex (and sub-includes) + * don't actually give a prototype for adjtimex(2), so building + * this code (with -Wall) gives a warning. Later versions of + * glibc fix this issue. + * + * This program is too simple for a Makefile, just build with: + * gcc -Wall -O adjtimex.c -o adjtimex + * + * busyboxed 20 March 2001, Larry Doolittle <ldoolitt@recycle.lbl.gov> + * It will autosense if it is built in a busybox environment, based + * on the BB_VER preprocessor macro. + */ + +#include <stdio.h> +#include <sys/types.h> +#include <stdlib.h> +#include <unistd.h> +#include <sys/timex.h> +#ifdef BB_VER +#include "busybox.h" +#endif + +static struct {int bit; char *name;} statlist[] = { + { STA_PLL, "PLL" }, + { STA_PPSFREQ, "PPSFREQ" }, + { STA_PPSTIME, "PPSTIME" }, + { STA_FLL, "FFL" }, + { STA_INS, "INS" }, + { STA_DEL, "DEL" }, + { STA_UNSYNC, "UNSYNC" }, + { STA_FREQHOLD, "FREQHOLD" }, + { STA_PPSSIGNAL, "PPSSIGNAL" }, + { STA_PPSJITTER, "PPSJITTER" }, + { STA_PPSWANDER, "PPSWANDER" }, + { STA_PPSERROR, "PPSERROR" }, + { STA_CLOCKERR, "CLOCKERR" }, + { 0, NULL } }; + +static char *ret_code_descript[] = { + "clock synchronized", + "insert leap second", + "delete leap second", + "leap second in progress", + "leap second has occurred", + "clock not synchronized" }; + +#ifdef BB_VER +#define main adjtimex_main +#else +void usage(char *prog) +{ + fprintf(stderr, + "Usage: %s [ -q ] [ -o offset ] [ -f frequency ] [ -p timeconstant ] [ -t tick ]\n", + prog); +} +#define show_usage() usage(argv[0]) +#endif + +int main(int argc, char ** argv) +{ + struct timex txc; + int quiet=0; + int c, i, ret, sep; + char *descript; + txc.modes=0; + for (;;) { + c = getopt( argc, argv, "qo:f:p:t:"); + if (c == EOF) break; + switch (c) { + case 'q': + quiet=1; + break; + case 'o': + txc.offset = atoi(optarg); + txc.modes |= ADJ_OFFSET_SINGLESHOT; + break; + case 'f': + txc.freq = atoi(optarg); + txc.modes |= ADJ_FREQUENCY; + break; + case 'p': + txc.constant = atoi(optarg); + txc.modes |= ADJ_TIMECONST; + break; + case 't': + txc.tick = atoi(optarg); + txc.modes |= ADJ_TICK; + break; + default: + show_usage(); + exit(1); + } + } + if (argc != optind) { /* no valid non-option parameters */ + show_usage(); + exit(1); + } + + ret = adjtimex(&txc); + + if (ret < 0) perror("adjtimex"); + + if (!quiet && ret>=0) { + printf( + " mode: %d\n" + "-o offset: %ld\n" + "-f frequency: %ld\n" + " maxerror: %ld\n" + " esterror: %ld\n" + " status: %d ( ", + txc.modes, txc.offset, txc.freq, txc.maxerror, + txc.esterror, txc.status); + + /* representative output of next code fragment: + "PLL | PPSTIME" */ + sep=0; + for (i=0; statlist[i].name; i++) { + if (txc.status & statlist[i].bit) { + if (sep) fputs(" | ",stdout); + fputs(statlist[i].name,stdout); + sep=1; + } + } + + descript = "error"; + if (ret >= 0 && ret <= 5) descript = ret_code_descript[ret]; + printf(" )\n" + "-p timeconstant: %ld\n" + " precision: %ld\n" + " tolerance: %ld\n" + "-t tick: %ld\n" + " time.tv_sec: %ld\n" + " time.tv_usec: %ld\n" + " return value: %d (%s)\n", + txc.constant, + txc.precision, txc.tolerance, txc.tick, + txc.time.tv_sec, txc.time.tv_usec, ret, descript); + } + return (ret<0); +} |