android13/external/ltp/testcases/kernel/syscalls/sysinfo/sysinfo03.c

85 lines
1.8 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
Copyright (c) 2020 Cyril Hrubis <chrubis@suse.cz>
*/
/*
Test if CLOCK_BOOTTIME namespace offset is applied to sysinfo uptime and that
it's consistent with /proc/uptime as well.
After a call to unshare(CLONE_NEWTIME) a new timer namespace is created, the
process that has called the unshare() can adjust offsets for CLOCK_MONOTONIC
and CLOCK_BOOTTIME for its children by writing to the '/proc/self/timens_offsets'.
*/
#include <sys/sysinfo.h>
#include "lapi/namespaces_constants.h"
#include "lapi/posix_clocks.h"
#include "tst_test.h"
static int offsets[] = {
10,
-10,
3600,
};
static long read_proc_uptime(void)
{
long sec, sec_rem;
SAFE_FILE_SCANF("/proc/uptime", "%li.%li", &sec, &sec_rem);
return sec + (sec_rem ? 1 : 0);
}
static void verify_sysinfo(unsigned int n)
{
struct sysinfo si;
long uptime;
int off = offsets[n];
SAFE_UNSHARE(CLONE_NEWTIME);
SAFE_FILE_PRINTF("/proc/self/timens_offsets", "%d %d 0",
CLOCK_BOOTTIME, off);
sysinfo(&si);
uptime = si.uptime;
if (!SAFE_FORK()) {
sysinfo(&si);
long proc_uptime = read_proc_uptime();
long diff = si.uptime - uptime;
if (diff < off || diff > off + 1)
tst_res(TFAIL, "Wrong sysinfo uptime offset %li", diff);
else
tst_res(TPASS, "Correct sysinfo uptime offset %i", off);
if (si.uptime < proc_uptime || si.uptime > proc_uptime + 1) {
tst_res(TFAIL, "/proc/uptime %li differs from sysinfo %li",
proc_uptime, si.uptime);
} else {
tst_res(TPASS, "/proc/uptime is consistent with sysinfo");
}
}
}
static struct tst_test test = {
.tcnt = ARRAY_SIZE(offsets),
.test = verify_sysinfo,
.needs_root = 1,
.forks_child = 1,
.needs_kconfigs = (const char *[]) {
"CONFIG_TIME_NS=y",
NULL
},
.tags = (const struct tst_tag[]) {
{"linux-git", "ecc421e05bab"},
{}
}
};