/* 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
*
* 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.
+
+//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 and optionally set system timebase parameters. See adjtimex(2)\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 (positive values make clock run faster)"
//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"
# include <sys/timex.h>
#endif
-static const uint16_t statlist_bit[] = {
+static const uint16_t statlist_bit[] ALIGN2 = {
STA_PLL,
STA_PPSFREQ,
STA_PPSTIME,
STA_CLOCKERR,
0
};
-static const char statlist_name[] =
+static const char statlist_name[] ALIGN1 =
"PLL" "\0"
"PPSFREQ" "\0"
"PPSTIME" "\0"
"CLOCKERR"
;
-static const char ret_code_descript[] =
+static const char ret_code_descript[] ALIGN1 =
"clock synchronized" "\0"
"insert leap second" "\0"
"delete leap second" "\0"
unsigned opt;
char *opt_o, *opt_f, *opt_p, *opt_t;
struct timex txc;
- int i, ret;
+ int ret;
const char *descript;
- opt_complementary = "=0"; /* no valid non-option parameters */
- opt = getopt32(argv, "qo:f:p:t:",
- &opt_o, &opt_f, &opt_p, &opt_t);
- txc.modes = 0;
+ 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 = xatol(opt_o);
txc.modes |= ADJ_TICK;
}
- ret = adjtimex(&txc);
+ /* 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
+ */
- if (ret < 0) {
+ ret = adjtimex(&txc);
+ if (ret < 0)
bb_perror_nomsg_and_die();
- }
if (!(opt & OPT_quiet)) {
- int sep;
+ const char *sep;
const char *name;
+ int i;
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);
+ txc.modes, txc.offset, txc.freq, txc.maxerror,
+ txc.esterror, txc.status
+ );
/* representative output of next code fragment:
- "PLL | PPSTIME" */
+ * "PLL | PPSTIME"
+ */
name = statlist_name;
- sep = 0;
+ sep = "";
for (i = 0; statlist_bit[i]; i++) {
if (txc.status & statlist_bit[i]) {
- if (sep)
- fputs(" | ", stdout);
- fputs(name, stdout);
- sep = 1;
+ printf("%s%s", sep, name);
+ sep = " | ";
}
name += strlen(name) + 1;
}
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 0;