133 lines
3.3 KiB
C
133 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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Copyright (c) 2020 Cyril Hrubis <chrubis@suse.cz>
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*/
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/*
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Test that timerfd adds correctly an offset with absolute expiration time.
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After a call to unshare(CLONE_NEWTIME) a new timer namespace is created, the
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process that has called the unshare() can adjust offsets for CLOCK_MONOTONIC
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and CLOCK_BOOTTIME for its children by writing to the '/proc/self/timens_offsets'.
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*/
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#include <stdlib.h>
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#include "time64_variants.h"
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#include "tst_safe_clocks.h"
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#include "tst_safe_timerfd.h"
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#include "tst_timer.h"
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#include "lapi/namespaces_constants.h"
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#define SLEEP_US 40000
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static struct tcase {
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int clk_id;
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int clk_off;
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int off;
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} tcases[] = {
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{CLOCK_MONOTONIC, CLOCK_MONOTONIC, 10},
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{CLOCK_BOOTTIME, CLOCK_BOOTTIME, 10},
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{CLOCK_MONOTONIC, CLOCK_MONOTONIC, -10},
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{CLOCK_BOOTTIME, CLOCK_BOOTTIME, -10},
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};
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static struct time64_variants variants[] = {
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#if (__NR_timerfd_settime != __LTP__NR_INVALID_SYSCALL)
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{ .clock_gettime = sys_clock_gettime, .tfd_settime = sys_timerfd_settime, .ts_type = TST_KERN_OLD_TIMESPEC, .desc = "syscall with old kernel spec"},
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#endif
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#if (__NR_timerfd_settime64 != __LTP__NR_INVALID_SYSCALL)
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{ .clock_gettime = sys_clock_gettime64, .tfd_settime = sys_timerfd_settime64, .ts_type = TST_KERN_TIMESPEC, .desc = "syscall time64 with kernel spec"},
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#endif
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};
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static void setup(void)
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{
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tst_res(TINFO, "Testing variant: %s", variants[tst_variant].desc);
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}
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static void verify_timerfd(unsigned int n)
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{
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struct time64_variants *tv = &variants[tst_variant];
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struct tst_ts start, end;
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struct tst_its it;
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struct tcase *tc = &tcases[n];
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start.type = end.type = it.type = tv->ts_type;
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SAFE_UNSHARE(CLONE_NEWTIME);
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SAFE_FILE_PRINTF("/proc/self/timens_offsets", "%d %d 0",
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tc->clk_off, tc->off);
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if (tv->clock_gettime(tc->clk_id, tst_ts_get(&start))) {
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tst_res(TFAIL | TERRNO, "clock_gettime(2) failed for clock %s",
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tst_clock_name(tc->clk_id));
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return;
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}
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end = tst_ts_add_us(start, 1000000 * tc->off + SLEEP_US);
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tst_its_set_interval_sec(&it, 0);
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tst_its_set_interval_nsec(&it, 0);
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tst_its_set_value_from_ts(&it, end);
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if (!SAFE_FORK()) {
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uint64_t exp;
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int fd = SAFE_TIMERFD_CREATE(tc->clk_id, 0);
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if (tv->tfd_settime(fd, TFD_TIMER_ABSTIME, tst_its_get(&it), NULL)) {
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tst_res(TFAIL | TERRNO, "timerfd_settime() failed");
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return;
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}
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SAFE_READ(1, fd, &exp, sizeof(exp));
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if (exp != 1)
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tst_res(TFAIL, "Got %llu expirations", (long long unsigned)exp);
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SAFE_CLOSE(fd);
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exit(0);
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}
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SAFE_WAIT(NULL);
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if (tv->clock_gettime(CLOCK_MONOTONIC, tst_ts_get(&end))) {
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tst_res(TFAIL | TERRNO, "clock_gettime(2) failed for clock %s",
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tst_clock_name(CLOCK_MONOTONIC));
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return;
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}
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long long diff = tst_ts_diff_us(end, start);
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if (diff > 5 * SLEEP_US) {
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tst_res(TFAIL, "timerfd %s slept too long %lli",
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tst_clock_name(tc->clk_id), diff);
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return;
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}
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if (diff < SLEEP_US) {
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tst_res(TFAIL, "timerfd %s slept too short %lli",
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tst_clock_name(tc->clk_id), diff);
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return;
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}
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tst_res(TPASS, "timerfd %s slept correctly %lli",
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tst_clock_name(tc->clk_id), diff);
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}
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static struct tst_test test = {
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.tcnt = ARRAY_SIZE(tcases),
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.test = verify_timerfd,
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.test_variants = ARRAY_SIZE(variants),
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.setup = setup,
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.needs_root = 1,
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.forks_child = 1,
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.needs_kconfigs = (const char *[]) {
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"CONFIG_TIME_NS=y",
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NULL
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}
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};
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