1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2016 Xiao Yang <yangx.jy@cn.fujitsu.com>
4 */
5
6 /*
7 * Testname: kcmp03.c
8 *
9 * Description:
10 * 1) kcmp() returns 0 if the processes share the same file system information.
11 * 2) kcmp() returns 0 if the processes share I/O context.
12 * 3) kcmp() returns 0 if the processes share the same list of System V
13 * semaphore undo operations.
14 * 4) kcmp() returns 0 if the processes share the same address space.
15 */
16
17 #define _GNU_SOURCE
18
19 #include <errno.h>
20 #include <stdlib.h>
21 #include <sched.h>
22 #include <sys/wait.h>
23 #include "tst_test.h"
24 #include "kcmp.h"
25 #include "lapi/sched.h"
26
27 #define STACK_SIZE (1024*1024)
28
29 static int pid1;
30 static int pid2;
31 static void *stack;
32
33 static struct tcase {
34 int clone_type;
35 int kcmp_type;
36 } tcases[] = {
37 {CLONE_VM, KCMP_VM},
38 {CLONE_FS, KCMP_FS},
39 {CLONE_IO, KCMP_IO},
40 {CLONE_SYSVSEM, KCMP_SYSVSEM}
41 };
42
setup(void)43 static void setup(void)
44 {
45 stack = SAFE_MALLOC(STACK_SIZE);
46 }
47
cleanup(void)48 static void cleanup(void)
49 {
50 free(stack);
51 }
52
do_child(void * arg)53 static int do_child(void *arg)
54 {
55 pid2 = getpid();
56
57 TEST(kcmp(pid1, pid2, *(int *)arg, 0, 0));
58 if (TST_RET == -1) {
59 tst_res(TFAIL | TTERRNO, "kcmp() failed unexpectedly");
60 return 0;
61 }
62
63 if (TST_RET == 0)
64 tst_res(TPASS, "kcmp() returned the expected value");
65 else
66 tst_res(TFAIL, "kcmp() returned the unexpected value");
67
68 return 0;
69 }
70
verify_kcmp(unsigned int n)71 static void verify_kcmp(unsigned int n)
72 {
73 int res;
74
75 struct tcase *tc = &tcases[n];
76
77 pid1 = getpid();
78
79 res = ltp_clone(tc->clone_type | SIGCHLD, do_child, &tc->kcmp_type,
80 STACK_SIZE, stack);
81 if (res == -1)
82 tst_res(TFAIL | TERRNO, "clone() Failed");
83 }
84
85 static struct tst_test test = {
86 .tcnt = ARRAY_SIZE(tcases),
87 .setup = setup,
88 .cleanup = cleanup,
89 .forks_child = 1,
90 .test = verify_kcmp,
91 .min_kver = "3.5.0"
92 };
93