LXR linux/tools/testing/selftests/kcmp/kcmp

   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