112 lines
3.1 KiB
C
112 lines
3.1 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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* [Description]
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*
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* Test that clock_nanosleep() adds correctly an offset with absolute timeout
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* and CLOCK_MONOTONIC inside of a timer namespace.
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*
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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_timer.h"
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#include "lapi/namespaces_constants.h"
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#define OFFSET_S 10
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#define SLEEP_US 100000
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static struct time64_variants variants[] = {
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{ .clock_gettime = libc_clock_gettime, .clock_nanosleep = libc_clock_nanosleep, .ts_type = TST_LIBC_TIMESPEC, .desc = "vDSO or syscall with libc spec"},
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#if (__NR_clock_nanosleep != __LTP__NR_INVALID_SYSCALL)
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{ .clock_gettime = sys_clock_gettime, .clock_nanosleep = sys_clock_nanosleep, .ts_type = TST_KERN_OLD_TIMESPEC, .desc = "syscall with old kernel spec"},
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#endif
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#if (__NR_clock_nanosleep_time64 != __LTP__NR_INVALID_SYSCALL)
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{ .clock_gettime = sys_clock_gettime64, .clock_nanosleep = sys_clock_nanosleep64, .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 do_clock_gettime(struct time64_variants *tv, struct tst_ts *ts)
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{
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int ret;
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ret = tv->clock_gettime(CLOCK_MONOTONIC, tst_ts_get(ts));
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if (ret == -1)
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tst_brk(TBROK | TERRNO, "clock_settime(CLOCK_MONOTONIC) failed");
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}
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static void verify_clock_nanosleep(void)
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{
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struct time64_variants *tv = &variants[tst_variant];
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struct tst_ts start, end, sleep_abs;
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tst_res(TINFO, "Testing variant: %s", tv->desc);
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start.type = end.type = sleep_abs.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", CLOCK_MONOTONIC, OFFSET_S);
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do_clock_gettime(tv, &start);
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sleep_abs = tst_ts_add_us(start, 1000000 * OFFSET_S + SLEEP_US);
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if (!SAFE_FORK()) {
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TEST(tv->clock_nanosleep(CLOCK_MONOTONIC, TIMER_ABSTIME, tst_ts_get(&sleep_abs), NULL));
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/*
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* The return value and error number are differently set for
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* libc syscall as compared to kernel syscall.
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*/
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if ((tv->clock_nanosleep == libc_clock_nanosleep) && TST_RET) {
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TST_ERR = TST_RET;
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TST_RET = -1;
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}
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if (TST_RET == -1) {
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tst_res(TFAIL | TTERRNO, "clock_nanosleep(2) failed for clock %s",
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tst_clock_name(CLOCK_MONOTONIC));
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}
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exit(0);
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}
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SAFE_WAIT(NULL);
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do_clock_gettime(tv, &end);
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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, "clock_nanosleep() slept too long %lli", 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, "clock_nanosleep() slept too short %lli", diff);
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return;
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}
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tst_res(TPASS, "clock_nanosleep() slept correctly %lli", diff);
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}
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static struct tst_test test = {
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.test_all = verify_clock_nanosleep,
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.test_variants = ARRAY_SIZE(variants),
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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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