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 static long sys_kcmp(int pid1, int pid2, int type, int fd1, int fd2)
  21 {
  22         return syscall(__NR_kcmp, pid1, pid2, type, fd1, fd2);
  23 }
  24
  25 int main(int argc, char **argv)
  26 {
  27         const char kpath[] = "kcmp-test-file";
  28         int pid1, pid2;
  29         int fd1, fd2;
  30         int status;
  31
  32         fd1 = open(kpath, O_RDWR | O_CREAT | O_TRUNC, 0644);
  33         pid1 = getpid();
  34
  35         if (fd1 < 0) {
  36                 perror("Can't create file");
  37                 exit(1);
  38         }
  39
  40         pid2 = fork();
  41         if (pid2 < 0) {
  42                 perror("fork failed");
  43                 exit(1);
  44         }
  45
  46         if (!pid2) {
  47                 int pid2 = getpid();
  48                 int ret;
  49
  50                 fd2 = open(kpath, O_RDWR, 0644);
  51                 if (fd2 < 0) {
  52                         perror("Can't open file");
  53                         exit(1);
  54                 }
  55
  56                 /* An example of output and arguments */
  57                 printf("pid1: %6d pid2: %6d FD: %2ld FILES: %2ld VM: %2ld "
  58                        "FS: %2ld SIGHAND: %2ld IO: %2ld SYSVSEM: %2ld "
  59                        "INV: %2ld\n",
  60                        pid1, pid2,
  61                        sys_kcmp(pid1, pid2, KCMP_FILE,          fd1, fd2),
  62                        sys_kcmp(pid1, pid2, KCMP_FILES,         0, 0),
  63                        sys_kcmp(pid1, pid2, KCMP_VM,            0, 0),
  64                        sys_kcmp(pid1, pid2, KCMP_FS,            0, 0),
  65                        sys_kcmp(pid1, pid2, KCMP_SIGHAND,       0, 0),
  66                        sys_kcmp(pid1, pid2, KCMP_IO,            0, 0),
  67                        sys_kcmp(pid1, pid2, KCMP_SYSVSEM,       0, 0),
  68
  69                         /* This one should fail */
  70                        sys_kcmp(pid1, pid2, KCMP_TYPES + 1,     0, 0));
  71
  72                 /* This one should return same fd */
  73                 ret = sys_kcmp(pid1, pid2, KCMP_FILE, fd1, fd1);
  74                 if (ret) {
  75                         printf("FAIL: 0 expected but %d returned (%s)\n",
  76                                 ret, strerror(errno));
  77                         ret = -1;
  78                 } else
  79                         printf("PASS: 0 returned as expected\n");
  80
  81                 /* Compare with self */
  82                 ret = sys_kcmp(pid1, pid1, KCMP_VM, 0, 0);
  83                 if (ret) {
  84                         printf("FAIL: 0 expected but %li returned (%s)\n",
  85                                 ret, strerror(errno));
  86                         ret = -1;
  87                 } else
  88                         printf("PASS: 0 returned as expected\n");
  89
  90                 exit(ret);
  91         }
  92
  93         waitpid(pid2, &status, P_ALL);
  94
  95         return 0;
  96 }