1#define _GNU_SOURCE
2
3#include <stdio.h>
4#include <stdlib.h>
5#include <signal.h>
6#include <limits.h>
7#include <unistd.h>
8#include <errno.h>
9#include <string.h>
10#include <fcntl.h>
11
12#include <linux/unistd.h>
13#include <linux/kcmp.h>
14
15#include <sys/syscall.h>
16#include <sys/types.h>
17#include <sys/stat.h>
18#include <sys/wait.h>
19
20#include "../kselftest.h"
21
22static long sys_kcmp(int pid1, int pid2, int type, int fd1, int fd2)
23{
24	return syscall(__NR_kcmp, pid1, pid2, type, fd1, fd2);
25}
26
27int main(int argc, char **argv)
28{
29	const char kpath[] = "kcmp-test-file";
30	int pid1, pid2;
31	int fd1, fd2;
32	int status;
33
34	fd1 = open(kpath, O_RDWR | O_CREAT | O_TRUNC, 0644);
35	pid1 = getpid();
36
37	if (fd1 < 0) {
38		perror("Can't create file");
39		ksft_exit_fail();
40	}
41
42	pid2 = fork();
43	if (pid2 < 0) {
44		perror("fork failed");
45		ksft_exit_fail();
46	}
47
48	if (!pid2) {
49		int pid2 = getpid();
50		int ret;
51
52		fd2 = open(kpath, O_RDWR, 0644);
53		if (fd2 < 0) {
54			perror("Can't open file");
55			ksft_exit_fail();
56		}
57
58		/* An example of output and arguments */
59		printf("pid1: %6d pid2: %6d FD: %2ld FILES: %2ld VM: %2ld "
60		       "FS: %2ld SIGHAND: %2ld IO: %2ld SYSVSEM: %2ld "
61		       "INV: %2ld\n",
62		       pid1, pid2,
63		       sys_kcmp(pid1, pid2, KCMP_FILE,		fd1, fd2),
64		       sys_kcmp(pid1, pid2, KCMP_FILES,		0, 0),
65		       sys_kcmp(pid1, pid2, KCMP_VM,		0, 0),
66		       sys_kcmp(pid1, pid2, KCMP_FS,		0, 0),
67		       sys_kcmp(pid1, pid2, KCMP_SIGHAND,	0, 0),
68		       sys_kcmp(pid1, pid2, KCMP_IO,		0, 0),
69		       sys_kcmp(pid1, pid2, KCMP_SYSVSEM,	0, 0),
70
71			/* This one should fail */
72		       sys_kcmp(pid1, pid2, KCMP_TYPES + 1,	0, 0));
73
74		/* This one should return same fd */
75		ret = sys_kcmp(pid1, pid2, KCMP_FILE, fd1, fd1);
76		if (ret) {
77			printf("FAIL: 0 expected but %d returned (%s)\n",
78				ret, strerror(errno));
79			ksft_inc_fail_cnt();
80			ret = -1;
81		} else {
82			printf("PASS: 0 returned as expected\n");
83			ksft_inc_pass_cnt();
84		}
85
86		/* Compare with self */
87		ret = sys_kcmp(pid1, pid1, KCMP_VM, 0, 0);
88		if (ret) {
89			printf("FAIL: 0 expected but %d returned (%s)\n",
90				ret, strerror(errno));
91			ksft_inc_fail_cnt();
92			ret = -1;
93		} else {
94			printf("PASS: 0 returned as expected\n");
95			ksft_inc_pass_cnt();
96		}
97
98		ksft_print_cnts();
99
100		if (ret)
101			ksft_exit_fail();
102		else
103			ksft_exit_pass();
104	}
105
106	waitpid(pid2, &status, P_ALL);
107
108	return ksft_exit_pass();
109}
110