xref: /freebsd/lib/libkvm/tests/kvm_read_test.c (revision f126890ac5386406dadf7c4cfa9566cbb56537c5)
1 /*-
2  * Copyright (c) 2020 Alfredo Dal'Ava Junior <alfredo@freebsd.org>
3  * Copyright (c) 2017 Enji Cooper <ngie@freebsd.org>
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  * From: FreeBSD: src/lib/libkvm/tests/kvm_geterr_test.c
27  */
28 
29 #include <sys/param.h>
30 #include <sys/sysctl.h>
31 #include <errno.h>
32 #include <fcntl.h>
33 #include <kvm.h>
34 #include <limits.h>
35 #include <signal.h>
36 #include <stdio.h>
37 #include <stdlib.h>
38 
39 #include <atf-c.h>
40 
41 #include "kvm_test_common.h"
42 
43 ATF_TC(kvm_read_positive_test_no_error);
44 ATF_TC_HEAD(kvm_read_positive_test_no_error, tc)
45 {
46 
47 	atf_tc_set_md_var(tc, "descr",
48 	    "test that kvm_read returns a sane value");
49 	atf_tc_set_md_var(tc, "require.user", "root");
50 }
51 
52 ATF_TC_BODY(kvm_read_positive_test_no_error, tc)
53 {
54 	kvm_t *kd;
55 	struct nlist nl[] = {
56 #define	SYMNAME	"_mp_maxcpus"
57 #define	X_MAXCPUS	0
58 		{ SYMNAME, 0, 0, 0, 0 },
59 		{ NULL, 0, 0, 0, 0 },
60 	};
61 	ssize_t rc;
62 	int sysctl_maxcpus, mp_maxcpus, retcode;
63 	size_t len = sizeof(sysctl_maxcpus);
64 
65 	errbuf_clear();
66 	kd = kvm_open(NULL, NULL, NULL, O_RDONLY, errbuf);
67 	ATF_CHECK(!errbuf_has_error(errbuf));
68 	ATF_REQUIRE_MSG(kd != NULL, "kvm_open failed: %s", errbuf);
69 	retcode = kvm_nlist(kd, nl);
70 	ATF_REQUIRE_MSG(retcode != -1,
71 	    "kvm_nlist failed (returned %d): %s", retcode, kvm_geterr(kd));
72 	if (nl[X_MAXCPUS].n_type == 0)
73 		atf_tc_skip("symbol (\"%s\") couldn't be found", SYMNAME);
74 
75 	rc = kvm_read(kd, nl[X_MAXCPUS].n_value, &mp_maxcpus,
76 	    sizeof(mp_maxcpus));
77 
78 	ATF_REQUIRE_MSG(rc != -1, "kvm_read failed: %s", kvm_geterr(kd));
79 	ATF_REQUIRE_MSG(kvm_close(kd) == 0, "kvm_close failed: %s",
80 	    strerror(errno));
81 
82 	/* Check if value read from kvm_read is sane */
83         retcode = sysctlbyname("kern.smp.maxcpus", &sysctl_maxcpus, &len, NULL, 0);
84 	ATF_REQUIRE_MSG(retcode == 0, "sysctl read failed : %d", retcode);
85 	ATF_REQUIRE_EQ_MSG(mp_maxcpus, sysctl_maxcpus,
86 	    "failed: kvm_read of mp_maxcpus returned %d but sysctl maxcpus returned %d",
87 	    mp_maxcpus, sysctl_maxcpus);
88 }
89 
90 ATF_TP_ADD_TCS(tp)
91 {
92 
93 	ATF_TP_ADD_TC(tp, kvm_read_positive_test_no_error);
94 	return (atf_no_error());
95 }
96