kernel/tools/testing/selftests/kcmp/kcmp_test.c

   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 }