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 <sys/wait.h>
22 #include "tst_test.h"
23 #include "lapi/kcmp.h"
24 #include "lapi/sched.h"
25
26 #define STACK_SIZE (1024*1024)
27
28 static int pid1;
29 static int pid2;
30 static void *stack;
31
32 static struct tcase {
33 int clone_type;
34 int kcmp_type;
35 } tcases[] = {
36 {CLONE_VM, KCMP_VM},
37 {CLONE_FS, KCMP_FS},
38 {CLONE_IO, KCMP_IO},
39 {CLONE_SYSVSEM, KCMP_SYSVSEM}
40 };
41
setup(void)42 static void setup(void)
43 {
44 stack = SAFE_MALLOC(STACK_SIZE);
45 }
46
cleanup(void)47 static void cleanup(void)
48 {
49 free(stack);
50 }
51
do_child(void * arg)52 static int do_child(void *arg)
53 {
54 pid2 = getpid();
55
56 TEST(kcmp(pid1, pid2, *(int *)arg, 0, 0));
57 if (TST_RET == -1) {
58 tst_res(TFAIL | TTERRNO, "kcmp() failed unexpectedly");
59 return 0;
60 }
61
62 if (TST_RET == 0)
63 tst_res(TPASS, "kcmp() returned the expected value");
64 else
65 tst_res(TFAIL, "kcmp() returned the unexpected value");
66
67 return 0;
68 }
69
verify_kcmp(unsigned int n)70 static void verify_kcmp(unsigned int n)
71 {
72 int res;
73
74 struct tcase *tc = &tcases[n];
75
76 pid1 = getpid();
77
78 res = ltp_clone(tc->clone_type | SIGCHLD, do_child, &tc->kcmp_type,
79 STACK_SIZE, stack);
80 if (res == -1)
81 tst_res(TFAIL | TERRNO, "clone() Failed");
82 }
83
84 static struct tst_test test = {
85 .tcnt = ARRAY_SIZE(tcases),
86 .setup = setup,
87 .cleanup = cleanup,
88 .forks_child = 1,
89 .test = verify_kcmp,
90 };
91