1 /*
2 * Copyright (c) International Business Machines Corp., 2001
3 * Copyright (c) 2018 Xiao Yang <yangx.jy@cn.fujitsu.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 */
15
16 /*
17 * DESCRIPTION:
18 * Testcase for testing the basic functionality of sysctl(2) system call.
19 * This testcase attempts to read the kernel parameters by using
20 * sysctl({CTL_KERN, KERN_* }, ...) and compares it with the known values.
21 */
22
23 #include <errno.h>
24 #include <stdio.h>
25 #include <string.h>
26 #include <linux/version.h>
27 #include <sys/utsname.h>
28 #include <linux/unistd.h>
29 #include <linux/sysctl.h>
30
31 #include "tst_test.h"
32 #include "lapi/syscalls.h"
33
34 static struct utsname buf;
35
36 static struct tcase {
37 char *desc;
38 int name[2];
39 char *cmp_str;
40 } tcases[] = {
41 {"KERN_OSTYPE", {CTL_KERN, KERN_OSTYPE}, buf.sysname},
42 {"KERN_OSRELEASE", {CTL_KERN, KERN_OSRELEASE}, buf.release},
43 {"KERN_VERSION", {CTL_KERN, KERN_VERSION}, buf.version},
44 };
45
verify_sysctl(unsigned int n)46 static void verify_sysctl(unsigned int n)
47 {
48 char osname[BUFSIZ];
49 size_t length = BUFSIZ;
50 struct tcase *tc = &tcases[n];
51
52 memset(osname, 0, BUFSIZ);
53
54 struct __sysctl_args args = {
55 .name = tc->name,
56 .nlen = ARRAY_SIZE(tc->name),
57 .oldval = osname,
58 .oldlenp = &length,
59 };
60
61 TEST(tst_syscall(__NR__sysctl, &args));
62 if (TST_RET != 0) {
63 tst_res(TFAIL | TTERRNO, "sysctl() failed unexpectedly");
64 return;
65 }
66
67 if (strcmp(osname, tc->cmp_str)) {
68 tst_res(TFAIL, "Strings don't match %s : %s",
69 osname, tc->cmp_str);
70 } else {
71 tst_res(TPASS, "Test for %s is correct", tc->desc);
72 }
73 }
74
setup(void)75 static void setup(void)
76 {
77 /* get kernel name and information */
78 if (uname(&buf) == -1)
79 tst_brk(TBROK | TERRNO, "uname() failed");
80 }
81
82 static struct tst_test test = {
83 .setup = setup,
84 .tcnt = ARRAY_SIZE(tcases),
85 .test = verify_sysctl,
86 };
87