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 22 static 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 27 int 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