126 lines
3.6 KiB
C
126 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2019 FUJITSU LIMITED. All rights reserved.
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* Author: Yang Xu <xuyang2018.jy@cn.fujitsu.com>
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*
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* Test PR_GET_TIMERSLACK and PR_SET_TIMERSLACK of prctl(2).
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* 1)Each thread has two associated timer slack values: a "default"
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* value, and a "current" value. PR_SET_TIMERSLACK sets the "current"
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* timer slack value for the calling thread.
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* 2)When a new thread is created, the two timer slack values are made
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* the same as the "current" value of the creating thread.
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* 3)The maximum timer slack value is ULONG_MAX. On 32bit machines, it
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* is a valid value(about 4s). On 64bit machines, it is about 500 years
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* and no person will set this over 4s. prctl return value is int, so
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* we test themaximum value is INT_MAX.
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* 4)we also check current value via /proc/self/timerslack_ns if it is
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* supported.
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*/
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#include <sys/prctl.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <linux/limits.h>
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#include "lapi/syscalls.h"
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#include "lapi/prctl.h"
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#include "tst_test.h"
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#define PROC_TIMERSLACK_PATH "/proc/self/timerslack_ns"
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static void check_reset_timerslack(char *message);
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static void check_get_timerslack(char *message, unsigned long value);
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static void check_inherit_timerslack(char *message, unsigned long value);
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static unsigned long origin_value;
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static struct tcase {
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void (*func_check)();
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unsigned long setvalue;
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unsigned long expvalue;
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char message[50];
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} tcases[] = {
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{check_reset_timerslack, 0, 50000, "Reset"},
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{check_get_timerslack, 1, 1, "Min"},
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{check_get_timerslack, 70000, 70000, "Middle"},
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{check_get_timerslack, INT_MAX, INT_MAX, "Max"},
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{check_inherit_timerslack, 70000, 70000, "Child process"},
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};
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static int proc_flag = 1;
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static void check_reset_timerslack(char *message)
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{
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check_get_timerslack(message, origin_value);
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}
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static void check_get_timerslack(char *message, unsigned long value)
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{
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TEST(prctl(PR_GET_TIMERSLACK));
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if ((unsigned long)TST_RET == value)
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tst_res(TPASS, "%s prctl(PR_GET_TIMERSLACK) got %lu expectedly",
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message, value);
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else
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tst_res(TFAIL, "%s prctl(PR_GET_TIMERSLACK) expected %lu got %lu",
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message, value, TST_RET);
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if (proc_flag)
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TST_ASSERT_INT(PROC_TIMERSLACK_PATH, value);
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}
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static void check_inherit_timerslack(char *message, unsigned long value)
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{
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int pid;
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unsigned long current_value;
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unsigned long default_value;
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pid = SAFE_FORK();
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if (pid == 0) {
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current_value = prctl(PR_GET_TIMERSLACK);
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prctl(PR_SET_TIMERSLACK, 0);
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default_value = prctl(PR_GET_TIMERSLACK);
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if (current_value == value && default_value == value)
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tst_res(TPASS,
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"%s two timer slack values are made the same as the current value(%lu) of the creating thread.",
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message, value);
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else
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tst_res(TFAIL,
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"%s current_value is %lu, default value is %lu, the parent current value is %lu",
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message, current_value, default_value, value);
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}
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}
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static void verify_prctl(unsigned int n)
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{
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struct tcase *tc = &tcases[n];
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TEST(prctl(PR_SET_TIMERSLACK, tc->setvalue));
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if (TST_RET == -1) {
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tst_res(TFAIL | TTERRNO, "prctl(PR_SET_TIMERSLACK, %lu) failed",
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tc->setvalue);
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return;
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}
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tst_res(TPASS, "prctl(PR_SET_TIMERSLACK, %lu) succeed", tc->setvalue);
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tc->func_check(tc->message, tc->expvalue);
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}
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static void setup(void)
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{
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if (access(PROC_TIMERSLACK_PATH, F_OK) == -1) {
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tst_res(TCONF, "proc doesn't support timerslack_ns interface");
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proc_flag = 0;
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}
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TEST(prctl(PR_GET_TIMERSLACK));
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origin_value = TST_RET;
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tst_res(TINFO, "current timerslack value is %lu", origin_value);
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}
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static struct tst_test test = {
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.setup = setup,
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.test = verify_prctl,
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.tcnt = ARRAY_SIZE(tcases),
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.forks_child = 1,
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};
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