1 // SPDX-License-Identifier: GPL-2.0
12 #include <linux/unistd.h>
13 #include <linux/kcmp.h>
15 #include <sys/syscall.h>
16 #include <sys/types.h>
19 #include <sys/epoll.h>
21 #include "../kselftest.h"
23 static long sys_kcmp(int pid1, int pid2, int type, unsigned long fd1, unsigned long fd2)
25 return syscall(__NR_kcmp, pid1, pid2, type, fd1, fd2);
28 static const unsigned int duped_num = 64;
30 int main(int argc, char **argv)
32 const char kpath[] = "kcmp-test-file";
33 struct kcmp_epoll_slot epoll_slot;
34 struct epoll_event ev;
42 fd1 = open(kpath, O_RDWR | O_CREAT | O_TRUNC, 0644);
46 perror("Can't create file");
51 perror("Can't create pipe");
55 epollfd = epoll_create1(0);
57 perror("epoll_create1 failed");
61 memset(&ev, 0xff, sizeof(ev));
62 ev.events = EPOLLIN | EPOLLOUT;
64 if (epoll_ctl(epollfd, EPOLL_CTL_ADD, pipefd[0], &ev)) {
65 perror("epoll_ctl failed");
69 fddup = dup2(pipefd[1], duped_num);
71 perror("dup2 failed");
75 if (epoll_ctl(epollfd, EPOLL_CTL_ADD, fddup, &ev)) {
76 perror("epoll_ctl failed");
83 perror("fork failed");
91 fd2 = open(kpath, O_RDWR, 0644);
93 perror("Can't open file");
97 /* An example of output and arguments */
98 printf("pid1: %6d pid2: %6d FD: %2ld FILES: %2ld VM: %2ld "
99 "FS: %2ld SIGHAND: %2ld IO: %2ld SYSVSEM: %2ld "
102 sys_kcmp(pid1, pid2, KCMP_FILE, fd1, fd2),
103 sys_kcmp(pid1, pid2, KCMP_FILES, 0, 0),
104 sys_kcmp(pid1, pid2, KCMP_VM, 0, 0),
105 sys_kcmp(pid1, pid2, KCMP_FS, 0, 0),
106 sys_kcmp(pid1, pid2, KCMP_SIGHAND, 0, 0),
107 sys_kcmp(pid1, pid2, KCMP_IO, 0, 0),
108 sys_kcmp(pid1, pid2, KCMP_SYSVSEM, 0, 0),
110 /* This one should fail */
111 sys_kcmp(pid1, pid2, KCMP_TYPES + 1, 0, 0));
113 /* This one should return same fd */
114 ret = sys_kcmp(pid1, pid2, KCMP_FILE, fd1, fd1);
116 printf("FAIL: 0 expected but %d returned (%s)\n",
117 ret, strerror(errno));
121 printf("PASS: 0 returned as expected\n");
125 /* Compare with self */
126 ret = sys_kcmp(pid1, pid1, KCMP_VM, 0, 0);
128 printf("FAIL: 0 expected but %d returned (%s)\n",
129 ret, strerror(errno));
133 printf("PASS: 0 returned as expected\n");
137 /* Compare epoll target */
138 epoll_slot = (struct kcmp_epoll_slot) {
143 ret = sys_kcmp(pid1, pid1, KCMP_EPOLL_TFD, pipefd[1],
144 (unsigned long)(void *)&epoll_slot);
146 printf("FAIL: 0 expected but %d returned (%s)\n",
147 ret, strerror(errno));
151 printf("PASS: 0 returned as expected\n");
163 waitpid(pid2, &status, P_ALL);
165 return ksft_exit_pass();