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authorGravatar Mark Whitley <markw@lineo.com>2001-03-20 19:18:10 +0000
committerGravatar Mark Whitley <markw@lineo.com>2001-03-20 19:18:10 +0000
commit6f93277f56f97852d6e4e937ef758df0cce7b8ef (patch)
treebe1bc8a7504d208fea701fa4686d93bb6bd62576 /miscutils/adjtimex.c
parentba372620c256b23340c5630098f1a81c10022386 (diff)
downloadbusybox-6f93277f56f97852d6e4e937ef758df0cce7b8ef.tar.gz
busybox-6f93277f56f97852d6e4e937ef758df0cce7b8ef.tar.bz2
Added adjtimex applet from Larry Doolittle.
Diffstat (limited to 'miscutils/adjtimex.c')
-rw-r--r--miscutils/adjtimex.c169
1 files changed, 169 insertions, 0 deletions
diff --git a/miscutils/adjtimex.c b/miscutils/adjtimex.c
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+/*
+ * 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);
+}