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      1 /*
      2  * Copyright (c) International Business Machines  Corp., 2001
      3  * Copyright (c) 2018 Xiao Yang <yangx.jy (at) 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 
     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 
     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