/* vi: set sw=4 ts=4: */
/*
- * adjtimex.c - read, and possibly modify, the Linux kernel `timex' variables.
+ * adjtimex.c - read, and possibly modify, the Linux kernel 'timex' variables.
*
* Originally written: October 1997
* Last hack: March 2001
*
* busyboxed 20 March 2001, Larry Doolittle <ldoolitt@recycle.lbl.gov>
*
- * Licensed under GPLv2 or later, see file License in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//config:config ADJTIMEX
+//config: bool "adjtimex (4.5 kb)"
+//config: default y
+//config: select PLATFORM_LINUX
+//config: help
+//config: Adjtimex reads and optionally sets adjustment parameters for
+//config: the Linux clock adjustment algorithm.
-#include "busybox.h"
-#include <sys/timex.h>
-
-static const struct {int bit; const 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 const char * const ret_code_descript[] = {
- "clock synchronized",
- "insert leap second",
- "delete leap second",
- "leap second in progress",
- "leap second has occurred",
- "clock not synchronized" };
-
-int adjtimex_main(int argc, char **argv);
-int adjtimex_main(int argc, char **argv)
+//applet:IF_ADJTIMEX(APPLET_NOFORK(adjtimex, adjtimex, BB_DIR_SBIN, BB_SUID_DROP, adjtimex))
+
+//kbuild:lib-$(CONFIG_ADJTIMEX) += adjtimex.o
+
+//usage:#define adjtimex_trivial_usage
+//usage: "[-q] [-o OFF] [-f FREQ] [-p TCONST] [-t TICK]"
+//usage:#define adjtimex_full_usage "\n\n"
+//usage: "Read or set kernel time variables. See adjtimex(2)\n"
+//usage: "\n -q Quiet"
+//usage: "\n -o OFF Time offset, microseconds"
+//usage: "\n -f FREQ Frequency adjust, integer kernel units (65536 is 1ppm)"
+//usage: "\n -t TICK Microseconds per tick, usually 10000"
+//usage: "\n (positive -t or -f values make clock run faster)"
+//usage: "\n -p TCONST"
+
+#include "libbb.h"
+#ifdef __BIONIC__
+# include <linux/timex.h>
+#else
+# include <sys/timex.h>
+#endif
+
+static const uint16_t statlist_bit[] ALIGN2 = {
+ STA_PLL,
+ STA_PPSFREQ,
+ STA_PPSTIME,
+ STA_FLL,
+ STA_INS,
+ STA_DEL,
+ STA_UNSYNC,
+ STA_FREQHOLD,
+ STA_PPSSIGNAL,
+ STA_PPSJITTER,
+ STA_PPSWANDER,
+ STA_PPSERROR,
+ STA_CLOCKERR,
+ 0
+};
+static const char statlist_name[] ALIGN1 =
+ "PLL" "\0"
+ "PPSFREQ" "\0"
+ "PPSTIME" "\0"
+ "FFL" "\0"
+ "INS" "\0"
+ "DEL" "\0"
+ "UNSYNC" "\0"
+ "FREQHOLD" "\0"
+ "PPSSIGNAL" "\0"
+ "PPSJITTER" "\0"
+ "PPSWANDER" "\0"
+ "PPSERROR" "\0"
+ "CLOCKERR"
+;
+
+static const char ret_code_descript[] ALIGN1 =
+ "clock synchronized" "\0"
+ "insert leap second" "\0"
+ "delete leap second" "\0"
+ "leap second in progress" "\0"
+ "leap second has occurred" "\0"
+ "clock not synchronized"
+;
+
+int adjtimex_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int adjtimex_main(int argc UNUSED_PARAM, char **argv)
{
enum {
OPT_quiet = 0x1
unsigned opt;
char *opt_o, *opt_f, *opt_p, *opt_t;
struct timex txc;
- int i, ret, sep;
+ int ret;
const char *descript;
- txc.modes=0;
- opt = getopt32(argc, argv, "qo:f:p:t:",
- &opt_o, &opt_f, &opt_p, &opt_t);
+ memset(&txc, 0, sizeof(txc));
+
+ opt = getopt32(argv, "^" "qo:f:p:t:"
+ "\0" "=0"/*no valid non-option args*/,
+ &opt_o, &opt_f, &opt_p, &opt_t
+ );
//if (opt & 0x1) // -q
if (opt & 0x2) { // -o
- txc.offset = xatoi(opt_o);
+ txc.offset = xatol(opt_o);
txc.modes |= ADJ_OFFSET_SINGLESHOT;
}
if (opt & 0x4) { // -f
- txc.freq = xatou(opt_f);
+ txc.freq = xatol(opt_f);
txc.modes |= ADJ_FREQUENCY;
}
if (opt & 0x8) { // -p
- txc.constant = xatoi(opt_p);
+ txc.constant = xatol(opt_p);
txc.modes |= ADJ_TIMECONST;
}
if (opt & 0x10) { // -t
- txc.tick = xatoi(opt_t);
+ txc.tick = xatol(opt_t);
txc.modes |= ADJ_TICK;
}
- if (argc != optind) { /* no valid non-option parameters */
- bb_show_usage();
- }
+
+ /* It's NOFORK applet because the code is very simple:
+ * just some printf. No opens, no allocs.
+ * If you need to make it more complex, feel free to downgrade to NOEXEC
+ */
ret = adjtimex(&txc);
+ if (ret < 0)
+ bb_perror_nomsg_and_die();
- if (ret < 0) perror("adjtimex");
+ if (!(opt & OPT_quiet)) {
+ const char *sep;
+ const char *name;
+ int i;
- if (!(opt & OPT_quiet) && ret>=0) {
printf(
" mode: %d\n"
- "-o offset: %ld\n"
- "-f frequency: %ld\n"
+ "-o offset: %ld us\n"
+ "-f freq.adjust: %ld (65536 = 1ppm)\n"
" maxerror: %ld\n"
" esterror: %ld\n"
- " status: %d ( ",
- txc.modes, txc.offset, txc.freq, txc.maxerror,
- txc.esterror, txc.status);
+ " 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;
+ * "PLL | PPSTIME"
+ */
+ name = statlist_name;
+ sep = "";
+ for (i = 0; statlist_bit[i]; i++) {
+ if (txc.status & statlist_bit[i]) {
+ printf("%s%s", sep, name);
+ sep = " | ";
}
+ name += strlen(name) + 1;
}
descript = "error";
- if (ret >= 0 && ret <= 5) descript = ret_code_descript[ret];
- printf(" )\n"
+ if (ret <= 5)
+ descript = nth_string(ret_code_descript, ret);
+ printf(")\n"
"-p timeconstant: %ld\n"
- " precision: %ld\n"
+ " precision: %ld us\n"
" tolerance: %ld\n"
- "-t tick: %ld\n"
+ "-t tick: %ld us\n"
" time.tv_sec: %ld\n"
" time.tv_usec: %ld\n"
" return value: %d (%s)\n",
- txc.constant,
- txc.precision, txc.tolerance, txc.tick,
- (long)txc.time.tv_sec, (long)txc.time.tv_usec, ret, descript);
+ txc.constant,
+ txc.precision, txc.tolerance, txc.tick,
+ (long)txc.time.tv_sec, (long)txc.time.tv_usec,
+ ret, descript
+ );
}
- return (ret<0);
+
+ return 0;
}
projects / oweals / busybox.git / blobdiff