85 lines
1.8 KiB
C
85 lines
1.8 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 if CLOCK_BOOTTIME namespace offset is applied to sysinfo uptime and that
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it's consistent with /proc/uptime as well.
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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 <sys/sysinfo.h>
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#include "lapi/namespaces_constants.h"
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#include "lapi/posix_clocks.h"
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#include "tst_test.h"
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static int offsets[] = {
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10,
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-10,
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3600,
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};
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static long read_proc_uptime(void)
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{
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long sec, sec_rem;
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SAFE_FILE_SCANF("/proc/uptime", "%li.%li", &sec, &sec_rem);
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return sec + (sec_rem ? 1 : 0);
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}
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static void verify_sysinfo(unsigned int n)
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{
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struct sysinfo si;
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long uptime;
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int off = offsets[n];
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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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CLOCK_BOOTTIME, off);
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sysinfo(&si);
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uptime = si.uptime;
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if (!SAFE_FORK()) {
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sysinfo(&si);
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long proc_uptime = read_proc_uptime();
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long diff = si.uptime - uptime;
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if (diff < off || diff > off + 1)
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tst_res(TFAIL, "Wrong sysinfo uptime offset %li", diff);
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else
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tst_res(TPASS, "Correct sysinfo uptime offset %i", off);
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if (si.uptime < proc_uptime || si.uptime > proc_uptime + 1) {
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tst_res(TFAIL, "/proc/uptime %li differs from sysinfo %li",
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proc_uptime, si.uptime);
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} else {
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tst_res(TPASS, "/proc/uptime is consistent with sysinfo");
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}
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}
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}
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static struct tst_test test = {
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.tcnt = ARRAY_SIZE(offsets),
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.test = verify_sysinfo,
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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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.tags = (const struct tst_tag[]) {
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{"linux-git", "ecc421e05bab"},
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{}
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}
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};
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