264 lines
6.8 KiB
C
264 lines
6.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2019 Linaro Limited. All rights reserved.
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* Author: Rafael David Tinoco <rafael.tinoco@linaro.org>
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*/
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/*
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* clock_adjtime() syscall might have as execution path:
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*
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* 1) a regular POSIX clock (only REALTIME clock implements adjtime())
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* - will behave exactly like adjtimex() system call.
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* - only one being tested here.
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*
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* 2) a dynamic POSIX clock (which ops are implemented by PTP clocks)
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* - will trigger the PTP clock driver function "adjtime()"
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* - different implementations from one PTP clock to another
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* - might return EOPNOTSUPP (like ptp_kvm_caps, for example)
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* - no entry point for clock_adjtime(), missing "CLOCK_PTP" model
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*
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* so it is sane to check for the following errors:
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*
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* EINVAL - clock id being used does not exist
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*
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* EFAULT - (struct timex *) does not point to valid memory
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*
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* EINVAL - ADJ_OFFSET + .offset outside range -512000 < x < 512000
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* (after 2.6.26, kernels normalize to the limit if outside range)
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*
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* EINVAL - ADJ_FREQUENCY + .freq outside range -32768000 < x < 3276800
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* (after 2.6.26, kernels normalize to the limit if outside range)
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*
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* EINVAL - .tick outside permitted range (900000/HZ < .tick < 1100000/HZ)
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*
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* EPERM - .modes is neither 0 nor ADJ_OFFSET_SS_READ (CAP_SYS_TIME required)
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*
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* EINVAL - .status other than those listed bellow
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*
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* For ADJ_STATUS, consider the following flags:
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*
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* rw STA_PLL - enable phase-locked loop updates (ADJ_OFFSET)
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* rw STA_PPSFREQ - enable PPS (pulse-per-second) freq discipline
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* rw STA_PPSTIME - enable PPS time discipline
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* rw STA_FLL - select freq-locked loop mode.
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* rw STA_INS - ins leap sec after the last sec of UTC day (all days)
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* rw STA_DEL - del leap sec at last sec of UTC day (all days)
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* rw STA_UNSYNC - clock unsynced
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* rw STA_FREQHOLD - hold freq. ADJ_OFFSET made w/out auto small adjs
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* ro STA_PPSSIGNAL - valid PPS (pulse-per-second) signal is present
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* ro STA_PPSJITTER - PPS signal jitter exceeded.
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* ro STA_PPSWANDER - PPS signal wander exceeded.
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* ro STA_PPSERROR - PPS signal calibration error.
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* ro STA_CLOKERR - clock HW fault.
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* ro STA_NANO - 0 = us, 1 = ns (set = ADJ_NANO, cl = ADJ_MICRO)
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* rw STA_MODE - mode: 0 = phased locked loop. 1 = freq locked loop
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* ro STA_CLK - clock source. unused.
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*/
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#include "clock_adjtime.h"
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static long hz;
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static struct tst_timex saved, ttxc;
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static int supported;
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static void *bad_addr;
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static void cleanup(void);
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struct test_case {
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clockid_t clktype;
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unsigned int modes;
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long lowlimit;
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long highlimit;
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long delta;
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int exp_err;
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int droproot;
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};
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struct test_case tc[] = {
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{
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.clktype = MAX_CLOCKS,
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.exp_err = EINVAL,
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},
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{
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.clktype = MAX_CLOCKS + 1,
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.exp_err = EINVAL,
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},
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{
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.clktype = CLOCK_REALTIME,
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.modes = ADJ_ALL,
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.exp_err = EFAULT,
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},
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{
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.clktype = CLOCK_REALTIME,
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.modes = ADJ_TICK,
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.lowlimit = 900000,
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.delta = 1,
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.exp_err = EINVAL,
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},
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{
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.clktype = CLOCK_REALTIME,
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.modes = ADJ_TICK,
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.highlimit = 1100000,
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.delta = 1,
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.exp_err = EINVAL,
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},
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{
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.clktype = CLOCK_REALTIME,
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.modes = ADJ_ALL,
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.exp_err = EPERM,
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.droproot = 1,
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},
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};
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static struct test_variants {
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int (*clock_adjtime)(clockid_t clk_id, void *timex);
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enum tst_timex_type type;
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char *desc;
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} variants[] = {
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#if (__NR_clock_adjtime != __LTP__NR_INVALID_SYSCALL)
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{.clock_adjtime = sys_clock_adjtime, .type = TST_KERN_OLD_TIMEX, .desc = "syscall with old kernel spec"},
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#endif
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#if (__NR_clock_adjtime64 != __LTP__NR_INVALID_SYSCALL)
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{.clock_adjtime = sys_clock_adjtime64, .type = TST_KERN_TIMEX, .desc = "syscall time64 with kernel spec"},
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#endif
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};
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static void verify_clock_adjtime(unsigned int i)
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{
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struct test_variants *tv = &variants[tst_variant];
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uid_t whoami = 0;
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struct tst_timex *txcptr = &ttxc;
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struct passwd *nobody;
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static const char name[] = "nobody";
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int rval;
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memset(txcptr, 0, sizeof(*txcptr));
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txcptr->type = tv->type;
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rval = tv->clock_adjtime(CLOCK_REALTIME, tst_timex_get(txcptr));
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if (rval < 0) {
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tst_res(TFAIL | TERRNO, "clock_adjtime() failed %i", rval);
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return;
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}
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timex_show("GET", txcptr);
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if (tc[i].droproot) {
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nobody = SAFE_GETPWNAM(name);
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whoami = nobody->pw_uid;
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SAFE_SETEUID(whoami);
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}
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timex_set_field_uint(txcptr, ADJ_MODES, tc[i].modes);
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if (tc[i].delta) {
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if (tc[i].lowlimit)
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timex_set_field_long(&ttxc, tc[i].modes, tc[i].lowlimit - tc[i].delta);
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if (tc[i].highlimit)
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timex_set_field_long(&ttxc, tc[i].modes, tc[i].highlimit + tc[i].delta);
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}
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/* special case: EFAULT for bad addresses */
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if (tc[i].exp_err == EFAULT) {
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TEST(tv->clock_adjtime(tc[i].clktype, bad_addr));
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} else {
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TEST(tv->clock_adjtime(tc[i].clktype, tst_timex_get(txcptr)));
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timex_show("TEST", txcptr);
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}
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if (TST_RET >= 0) {
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tst_res(TFAIL, "clock_adjtime(): passed unexpectedly (mode=%x, "
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"uid=%d)", tc[i].modes, whoami);
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return;
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}
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if (tc[i].exp_err != TST_ERR) {
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tst_res(TFAIL | TTERRNO, "clock_adjtime(): expected %d but "
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"failed with %d (mode=%x, uid=%d)",
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tc[i].exp_err, TST_ERR, tc[i].modes, whoami);
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return;
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}
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tst_res(TPASS, "clock_adjtime(): failed as expected (mode=0x%x, "
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"uid=%d)", tc[i].modes, whoami);
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if (tc[i].droproot)
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SAFE_SETEUID(0);
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}
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static void setup(void)
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{
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struct test_variants *tv = &variants[tst_variant];
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size_t i;
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int rval;
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tst_res(TINFO, "Testing variant: %s", tv->desc);
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bad_addr = tst_get_bad_addr(NULL);
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saved.type = tv->type;
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rval = tv->clock_adjtime(CLOCK_REALTIME, tst_timex_get(&saved));
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if (rval < 0) {
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tst_res(TFAIL | TERRNO, "clock_adjtime() failed %i", rval);
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return;
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}
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supported = 1;
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if (rval != TIME_OK && rval != TIME_ERROR) {
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timex_show("SAVE_STATUS", &saved);
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tst_brk(TBROK | TERRNO, "clock has on-going leap changes, "
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"returned: %i", rval);
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}
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hz = SAFE_SYSCONF(_SC_CLK_TCK);
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/* fix high and low limits by dividing it per HZ value */
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for (i = 0; i < ARRAY_SIZE(tc); i++) {
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if (tc[i].modes == ADJ_TICK) {
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tc[i].highlimit /= hz;
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tc[i].lowlimit /= hz;
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}
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}
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}
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static void cleanup(void)
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{
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struct test_variants *tv = &variants[tst_variant];
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unsigned int modes = ADJ_ALL;
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int rval;
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if (supported == 0)
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return;
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/* restore clock resolution based on original status flag */
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if (timex_get_field_uint(&saved, ADJ_STATUS) & STA_NANO)
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modes |= ADJ_NANO;
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else
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modes |= ADJ_MICRO;
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timex_set_field_uint(&saved, ADJ_MODES, modes);
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/* restore original clock flags */
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rval = tv->clock_adjtime(CLOCK_REALTIME, tst_timex_get(&saved));
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if (rval < 0) {
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tst_res(TFAIL | TERRNO, "clock_adjtime() failed %i", rval);
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return;
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}
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}
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static struct tst_test test = {
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.test = verify_clock_adjtime,
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.setup = setup,
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.cleanup = cleanup,
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.tcnt = ARRAY_SIZE(tc),
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.test_variants = ARRAY_SIZE(variants),
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.needs_root = 1,
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.restore_wallclock = 1,
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};
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