[LTP] [PATCH v5 1/2] syscalls/prctl08: New test for prctl() with PR_{SET, GET}_TIMERSLACK
Yang Xu
xuyang2018.jy@cn.fujitsu.com
Fri Nov 8 13:00:18 CET 2019
Signed-off-by: Yang Xu <xuyang2018.jy@cn.fujitsu.com>
---
include/lapi/prctl.h | 5 +
runtest/syscalls | 1 +
testcases/kernel/syscalls/prctl/.gitignore | 1 +
testcases/kernel/syscalls/prctl/prctl08.c | 139 +++++++++++++++++++++
4 files changed, 146 insertions(+)
create mode 100644 testcases/kernel/syscalls/prctl/prctl08.c
diff --git a/include/lapi/prctl.h b/include/lapi/prctl.h
index 8ee492259..0b4e196c3 100644
--- a/include/lapi/prctl.h
+++ b/include/lapi/prctl.h
@@ -19,6 +19,11 @@
# define PR_SET_SECCOMP 22
#endif
+#ifndef PR_SET_TIMERSLACK
+# define PR_SET_TIMERSLACK 29
+# define PR_GET_TIMERSLACK 30
+#endif
+
#ifndef PR_SET_CHILD_SUBREAPER
# define PR_SET_CHILD_SUBREAPER 36
# define PR_GET_CHILD_SUBREAPER 37
diff --git a/runtest/syscalls b/runtest/syscalls
index 12d3e0d3b..fee91f909 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -879,6 +879,7 @@ prctl04 prctl04
prctl05 prctl05
prctl06 prctl06
prctl07 prctl07
+prctl08 prctl08
pread01 pread01
pread01_64 pread01_64
diff --git a/testcases/kernel/syscalls/prctl/.gitignore b/testcases/kernel/syscalls/prctl/.gitignore
index 2178db366..fe36a8e0f 100644
--- a/testcases/kernel/syscalls/prctl/.gitignore
+++ b/testcases/kernel/syscalls/prctl/.gitignore
@@ -6,3 +6,4 @@
/prctl06
/prctl06_execve
/prctl07
+/prctl08
diff --git a/testcases/kernel/syscalls/prctl/prctl08.c b/testcases/kernel/syscalls/prctl/prctl08.c
new file mode 100644
index 000000000..fd8ccb6ad
--- /dev/null
+++ b/testcases/kernel/syscalls/prctl/prctl08.c
@@ -0,0 +1,139 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2019 FUJITSU LIMITED. All rights reserved.
+ * Author: Yang Xu <xuyang2018.jy@cn.fujitsu.com>
+ *
+ * Test PR_GET_TIMERSLACK and PR_SET_TIMERSLACK of prctl(2).
+ * 1)Each thread has two associated timer slack values: a "default"
+ * value, and a "current" value. PR_SET_TIMERSLACK sets the "current"
+ * timer slack value for the calling thread.
+ * 2)When a new thread is created, the two timer slack values are made
+ * the same as the "current" value of the creating thread.
+ * 3)The maximum timer slack value is ULONG_MAX. On 32bit machines, it
+ * is a valid value(about 4s). On 64bit machines, it is about 500 years
+ * and no person will set this over 4s. prctl return value is int, so
+ * we test themaximum value is INT_MAX.
+ * 4)we also check current value via /proc/self/timerslack_ns if it is
+ * supported.
+ */
+
+#include <sys/prctl.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <linux/limits.h>
+#include "lapi/syscalls.h"
+#include "lapi/prctl.h"
+#include "tst_test.h"
+
+#define PROC_TIMERSLACK_PATH "/proc/self/timerslack_ns"
+
+static void check_reset_timerslack(char *message);
+static void check_get_timerslack(char *message, unsigned long value);
+static void check_inherit_timerslack(char *message, unsigned long value);
+static unsigned long origin_value;
+
+static struct tcase {
+ void (*func_check)();
+ unsigned long setvalue;
+ unsigned long expvalue;
+ char message[50];
+} tcases[] = {
+ {check_reset_timerslack, 0, 50000, "Reset"},
+ {check_get_timerslack, 1, 1, "Min"},
+ {check_get_timerslack, 70000, 70000, "Middle"},
+ {check_get_timerslack, INT_MAX, INT_MAX, "Max"},
+ {check_inherit_timerslack, 70000, 70000, "Child process"},
+};
+
+static int proc_flag = 1;
+
+static void check_reset_timerslack(char *message)
+{
+ check_get_timerslack(message, origin_value);
+}
+
+static void check_proc_timerslack(char *message, unsigned long value)
+{
+ unsigned long proc_value;
+
+ SAFE_FILE_SCANF(PROC_TIMERSLACK_PATH, "%lu", &proc_value);
+ if (proc_value == value)
+ tst_res(TPASS, "%s %s got %lu expectedly",
+ message, PROC_TIMERSLACK_PATH, proc_value);
+ else
+ tst_res(TFAIL, "%s %s expected %lu got %lu",
+ message, PROC_TIMERSLACK_PATH, value, proc_value);
+}
+
+static void check_get_timerslack(char *message, unsigned long value)
+{
+ TEST(prctl(PR_GET_TIMERSLACK));
+ if ((unsigned long)TST_RET == value)
+ tst_res(TPASS, "%s prctl(PR_GET_TIMERSLACK) got %lu expectedly",
+ message, value);
+ else
+ tst_res(TFAIL, "%s prctl(PR_GET_TIMERSLACK) expected %lu got %lu",
+ message, value, TST_RET);
+
+ if (proc_flag)
+ check_proc_timerslack(message, value);
+
+}
+
+static void check_inherit_timerslack(char *message, unsigned long value)
+{
+ int pid;
+ unsigned long current_value;
+ unsigned long default_value;
+
+ pid = SAFE_FORK();
+ if (pid == 0) {
+ current_value = prctl(PR_GET_TIMERSLACK);
+ prctl(PR_SET_TIMERSLACK, 0);
+ default_value = prctl(PR_GET_TIMERSLACK);
+ if (current_value == value && default_value == value)
+ tst_res(TPASS,
+ "%s two timer slack values are made the same as the current value(%lu) of the creating thread.",
+ message, value);
+ else
+ tst_res(TFAIL,
+ "%s current_value is %lu, default value is %lu, the parent current value is %lu",
+ message, current_value, default_value, value);
+ }
+
+}
+
+static void verify_prctl(unsigned int n)
+{
+ struct tcase *tc = &tcases[n];
+
+ TEST(prctl(PR_SET_TIMERSLACK, tc->setvalue));
+ if (TST_RET == -1) {
+ tst_res(TFAIL | TTERRNO, "prctl(PR_SET_TIMERSLACK, %lu) failed",
+ tc->setvalue);
+ return;
+ }
+
+ tst_res(TPASS, "prctl(PR_SET_TIMERSLACK, %lu) succeed", tc->setvalue);
+ tc->func_check(tc->message, tc->expvalue);
+}
+
+static void setup(void)
+{
+ if (access(PROC_TIMERSLACK_PATH, F_OK) == -1) {
+ tst_res(TCONF, "proc doesn't support timerslack_ns interface");
+ proc_flag = 0;
+ }
+
+ TEST(prctl(PR_GET_TIMERSLACK));
+ origin_value = TST_RET;
+ tst_res(TINFO, "current timerslack value is %lu", origin_value);
+}
+
+static struct tst_test test = {
+ .setup = setup,
+ .test = verify_prctl,
+ .tcnt = ARRAY_SIZE(tcases),
+ .forks_child = 1,
+};
--
2.18.0
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