From: dima@arista.com (Dmitry Safonov)
Subject: [RFC 19/20] timens/selftest: Add procfs selftest
Date: Wed, 19 Sep 2018 21:50:36 +0100 [thread overview]
Message-ID: <20180919205037.9574-20-dima@arista.com> (raw)
Message-ID: <20180919205036.PY_CCVyEre_qDocjOLu9f2rHfCtVGw2xs-voYiifp6E@z> (raw)
In-Reply-To: <20180919205037.9574-1-dima@arista.com>
Currently only uptime check, but procfs checks for REALTIME might be
added in future.
Cc: linux-kselftest at vger.kernel.org
Signed-off-by: Dmitry Safonov <dima at arista.com>
---
tools/testing/selftests/timens/.gitignore | 1 +
tools/testing/selftests/timens/Makefile | 2 +-
tools/testing/selftests/timens/procfs.c | 145 ++++++++++++++++++++++++++++++
3 files changed, 147 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/timens/procfs.c
diff --git a/tools/testing/selftests/timens/.gitignore b/tools/testing/selftests/timens/.gitignore
index 9b6c8ddac2c8..94ffdd9cead7 100644
--- a/tools/testing/selftests/timens/.gitignore
+++ b/tools/testing/selftests/timens/.gitignore
@@ -1,3 +1,4 @@
clock_nanosleep
+procfs
timens
timerfd
diff --git a/tools/testing/selftests/timens/Makefile b/tools/testing/selftests/timens/Makefile
index 76a1dc891184..f96f50d1fef8 100644
--- a/tools/testing/selftests/timens/Makefile
+++ b/tools/testing/selftests/timens/Makefile
@@ -1,4 +1,4 @@
-TEST_GEN_PROGS := timens timerfd clock_nanosleep
+TEST_GEN_PROGS := timens timerfd clock_nanosleep procfs
CFLAGS := -Wall -Werror
diff --git a/tools/testing/selftests/timens/procfs.c b/tools/testing/selftests/timens/procfs.c
new file mode 100644
index 000000000000..5067cbbddcc5
--- /dev/null
+++ b/tools/testing/selftests/timens/procfs.c
@@ -0,0 +1,145 @@
+// SPDX-License-Identifier: GPL-2.0
+#define _GNU_SOURCE
+#include <errno.h>
+#include <fcntl.h>
+#include <math.h>
+#include <sched.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <time.h>
+#include <unistd.h>
+#include <time.h>
+
+#include "log.h"
+
+#ifndef CLONE_NEWTIME
+# define CLONE_NEWTIME 0x00001000
+#endif
+
+/*
+ * Test shouldn't be run for a day, so add 10 days to child
+ * time and check parent's time to be in the same day.
+ */
+#define MAX_TEST_TIME_SEC (60*5)
+#define DAY_IN_SEC (60*60*24)
+#define TEN_DAYS_IN_SEC (10*DAY_IN_SEC)
+
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
+
+static int child_ns, parent_ns;
+
+static int switch_ns(int fd)
+{
+ if (setns(fd, CLONE_NEWTIME))
+ return pr_perror("setns()");
+
+ return 0;
+}
+
+static int init_namespaces(void)
+{
+ char path[] = "/proc/self/ns/time";
+ struct stat st1, st2;
+
+ parent_ns = open(path, O_RDONLY);
+ if (parent_ns <= 0)
+ return pr_perror("Unable to open %s", path);
+
+ if (fstat(parent_ns, &st1))
+ return pr_perror("Unable to stat the parent timens");
+
+ if (unshare(CLONE_NEWTIME))
+ return pr_perror("Can't unshare() timens");
+
+ child_ns = open(path, O_RDONLY);
+ if (child_ns <= 0)
+ return pr_perror("Unable to open %s", path);
+
+ if (fstat(child_ns, &st2))
+ return pr_perror("Unable to stat the timens");
+
+ if (st1.st_ino == st2.st_ino)
+ return pr_err("The same child_ns after CLONE_NEWTIME");
+
+ return 0;
+}
+
+static int read_proc_uptime(struct timespec *uptime)
+{
+ unsigned long up_sec, up_nsec;
+ FILE *proc;
+
+ proc = fopen("/proc/uptime", "r");
+ if (proc == NULL) {
+ pr_perror("Unable to open /proc/uptime");
+ return -1;
+ }
+
+ if (fscanf(proc, "%lu.%02lu", &up_sec, &up_nsec) != 2) {
+ if (errno) {
+ pr_perror("fscanf");
+ return -errno;
+ }
+ pr_err("failed to parse /proc/uptime");
+ return -1;
+ }
+ fclose(proc);
+
+ uptime->tv_sec = up_sec;
+ uptime->tv_nsec = up_nsec;
+ return 0;
+}
+
+static int check_uptime(void)
+{
+ struct timespec ts_btime, uptime_new, uptime_old;
+ time_t uptime_expected;
+ double prec = MAX_TEST_TIME_SEC;
+
+ if (switch_ns(parent_ns))
+ return pr_err("switch_ns(%d)", parent_ns);
+
+ if (clock_gettime(CLOCK_BOOTTIME, &ts_btime))
+ return pr_perror("clock_gettime()");
+
+ if (read_proc_uptime(&uptime_old))
+ return 1;
+
+ ts_btime.tv_sec += TEN_DAYS_IN_SEC;
+
+ if (switch_ns(child_ns))
+ return pr_err("switch_ns(%d)", child_ns);
+
+ if (clock_settime(CLOCK_BOOTTIME, &ts_btime))
+ return pr_perror("clock_settime()");
+
+ if (read_proc_uptime(&uptime_new))
+ return 1;
+
+ uptime_expected = uptime_old.tv_sec + TEN_DAYS_IN_SEC;
+ if (fabs(difftime(uptime_new.tv_sec, uptime_expected)) > prec) {
+ pr_fail("uptime in /proc/uptime: old %ld, new %ld [%ld]",
+ uptime_old.tv_sec, uptime_new.tv_sec,
+ uptime_old.tv_sec + TEN_DAYS_IN_SEC);
+ return 1;
+ }
+
+ pr_msg("Passed for /proc/uptime", "OK");
+ return 0;
+}
+
+int main(int argc, char *argv[])
+{
+ int ret = 0;
+
+ if (init_namespaces())
+ return 1;
+
+ ret |= check_uptime();
+
+ return ret;
+}
--
2.13.6
next prev parent reply other threads:[~2018-09-19 20:50 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-19 20:50 [RFC 00/20] ns: Introduce Time Namespace dima
2018-09-19 20:50 ` Dmitry Safonov
2018-09-19 20:50 ` [RFC 16/20] selftest: Add Time Namespace test for supported clocks dima
2018-09-19 20:50 ` Dmitry Safonov
2018-09-24 21:36 ` shuah
2018-09-24 21:36 ` Shuah Khan
2018-09-19 20:50 ` [RFC 17/20] selftest/timens: Add test for timerfd dima
2018-09-19 20:50 ` Dmitry Safonov
2018-09-19 20:50 ` [RFC 18/20] selftest/timens: Add test for clock_nanosleep dima
2018-09-19 20:50 ` Dmitry Safonov
2018-09-19 20:50 ` dima [this message]
2018-09-19 20:50 ` [RFC 19/20] timens/selftest: Add procfs selftest Dmitry Safonov
2018-09-19 20:50 ` [RFC 20/20] timens/selftest: Add timer offsets test dima
2018-09-19 20:50 ` Dmitry Safonov
2018-09-21 12:27 ` [RFC 00/20] ns: Introduce Time Namespace ebiederm
2018-09-21 12:27 ` Eric W. Biederman
2018-09-24 20:51 ` avagin
2018-09-24 20:51 ` Andrey Vagin
2018-09-24 22:02 ` ebiederm
2018-09-24 22:02 ` Eric W. Biederman
2018-09-25 1:42 ` avagin
2018-09-25 1:42 ` Andrey Vagin
2018-09-26 17:36 ` ebiederm
2018-09-26 17:36 ` Eric W. Biederman
2018-09-26 17:59 ` 0x7f454c46
2018-09-26 17:59 ` Dmitry Safonov
2018-09-27 21:30 ` tglx
2018-09-27 21:30 ` Thomas Gleixner
2018-09-27 21:41 ` tglx
2018-09-27 21:41 ` Thomas Gleixner
2018-10-01 23:20 ` avagin
2018-10-01 23:20 ` Andrey Vagin
2018-10-02 6:15 ` tglx
2018-10-02 6:15 ` Thomas Gleixner
2018-10-02 21:05 ` 0x7f454c46
2018-10-02 21:05 ` Dmitry Safonov
2018-10-02 21:26 ` tglx
2018-10-02 21:26 ` Thomas Gleixner
2018-09-28 17:03 ` ebiederm
2018-09-28 17:03 ` Eric W. Biederman
2018-09-28 19:32 ` tglx
2018-09-28 19:32 ` Thomas Gleixner
2018-10-01 9:05 ` ebiederm
2018-10-01 9:05 ` Eric W. Biederman
2018-10-01 9:15 ` Setting monotonic time? ebiederm
2018-10-01 9:15 ` Eric W. Biederman
2018-10-01 18:52 ` tglx
2018-10-01 18:52 ` Thomas Gleixner
2018-10-02 20:00 ` arnd
2018-10-02 20:00 ` Arnd Bergmann
2018-10-02 20:06 ` tglx
2018-10-02 20:06 ` Thomas Gleixner
2018-10-03 4:50 ` ebiederm
2018-10-03 4:50 ` Eric W. Biederman
2018-10-03 5:25 ` tglx
2018-10-03 5:25 ` Thomas Gleixner
2018-10-03 6:14 ` ebiederm
2018-10-03 6:14 ` Eric W. Biederman
2018-10-03 7:02 ` arnd
2018-10-03 7:02 ` Arnd Bergmann
2018-10-03 6:14 ` tglx
2018-10-03 6:14 ` Thomas Gleixner
2018-10-01 20:51 ` avagin
2018-10-01 20:51 ` Andrey Vagin
2018-10-02 6:16 ` tglx
2018-10-02 6:16 ` Thomas Gleixner
2018-10-21 1:41 ` [RFC 00/20] ns: Introduce Time Namespace avagin
2018-10-21 1:41 ` Andrei Vagin
2018-10-21 3:54 ` avagin
2018-10-21 3:54 ` Andrei Vagin
2018-10-29 20:33 ` tglx
2018-10-29 20:33 ` Thomas Gleixner
2018-10-29 21:21 ` ebiederm
2018-10-29 21:21 ` Eric W. Biederman
2018-10-29 21:36 ` tglx
2018-10-29 21:36 ` Thomas Gleixner
2018-10-31 16:26 ` avagin
2018-10-31 16:26 ` Andrei Vagin
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