1 /*
2 * Copyright (c) 2016 Xiao Yang <yangx.jy@cn.fujitsu.com>
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of
7 * the License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program.
16 */
17
18 /*
19 * Testname: kcmp03.c
20 *
21 * Description:
22 * 1) kcmp() returns 0 if the processes share the same file system information.
23 * 2) kcmp() returns 0 if the processes share I/O context.
24 * 3) kcmp() returns 0 if the processes share the same list of System V
25 * semaphore undo operations.
26 * 4) kcmp() returns 0 if the processes share the same address space.
27 */
28
29 #define _GNU_SOURCE
30
31 #include <errno.h>
32 #include <stdlib.h>
33 #include <sched.h>
34 #include <sys/wait.h>
35 #include "tst_test.h"
36 #include "kcmp.h"
37 #include "lapi/sched.h"
38
39 #define STACK_SIZE (1024*1024)
40
41 static int pid1;
42 static int pid2;
43 static void *stack;
44
45 static struct tcase {
46 int clone_type;
47 int kcmp_type;
48 } tcases[] = {
49 {CLONE_VM, KCMP_VM},
50 {CLONE_FS, KCMP_FS},
51 {CLONE_IO, KCMP_IO},
52 {CLONE_SYSVSEM, KCMP_SYSVSEM}
53 };
54
setup(void)55 static void setup(void)
56 {
57 stack = SAFE_MALLOC(STACK_SIZE);
58 }
59
cleanup(void)60 static void cleanup(void)
61 {
62 free(stack);
63 }
64
do_child(void * arg)65 static int do_child(void *arg)
66 {
67 pid2 = getpid();
68
69 TEST(kcmp(pid1, pid2, *(int *)arg, 0, 0));
70 if (TST_RET == -1) {
71 tst_res(TFAIL | TTERRNO, "kcmp() failed unexpectedly");
72 return 0;
73 }
74
75 if (TST_RET == 0)
76 tst_res(TPASS, "kcmp() returned the expected value");
77 else
78 tst_res(TFAIL, "kcmp() returned the unexpected value");
79
80 return 0;
81 }
82
verify_kcmp(unsigned int n)83 static void verify_kcmp(unsigned int n)
84 {
85 int res;
86
87 struct tcase *tc = &tcases[n];
88
89 pid1 = getpid();
90
91 res = ltp_clone(tc->clone_type | SIGCHLD, do_child, &tc->kcmp_type,
92 STACK_SIZE, stack);
93 if (res == -1)
94 tst_res(TFAIL | TERRNO, "clone() Failed");
95 }
96
97 static struct tst_test test = {
98 .tcnt = ARRAY_SIZE(tcases),
99 .setup = setup,
100 .cleanup = cleanup,
101 .forks_child = 1,
102 .test = verify_kcmp,
103 .min_kver = "3.5.0"
104 };
105