src/t_readdir_2.c

   1 #include <unistd.h>
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include <dirent.h>
   6 #include <fcntl.h>
   7 #include <sys/stat.h>
   8 #include <sys/types.h>
   9
  10 int main(int argc, char *argv[])
  11 {
  12         int fd;
  13         int ret;
  14         DIR *dir;
  15         struct dirent *ptr;
  16
  17         dir = opendir(argv[1]);
  18
  19         fd = dirfd(dir);
  20         if (fd < 0) {
  21                 perror("Failed to get dirfd!");
  22                 exit(EXIT_FAILURE);
  23         }
  24         ret = fork();
  25
  26         if (ret == 0) {
  27                 int ret1, i;
  28                 static int array[11] = {0, 1, 2, 3, 1023, 1024, 1025, 4095,
  29                                         4096, 4097, 0x7fffffff};
  30
  31                 while(1) {
  32                         for(i = 0; i < 11; i++) {
  33                                 ret1 = lseek(fd, array[i++], SEEK_SET);
  34                                 if (ret1 == -1) {
  35                                         perror("Seek failed!");
  36                                         exit(EXIT_FAILURE);
  37                                 }
  38                         }
  39
  40                         off_t pos = lseek(fd, 0, SEEK_CUR);
  41                         lseek(fd, pos, SEEK_SET);
  42                 }
  43         } else {
  44                 while (1) {
  45                         int ret2 = lseek(fd, 0, SEEK_SET);
  46                         if (ret2 == -1) {
  47                                 perror("Seek failed!");
  48                                 exit(EXIT_FAILURE);
  49                         }
  50                         while ((ptr = readdir(dir)))
  51                                         ;
  52                 }
  53         }
  54
  55         closedir(dir);
  56         exit(EXIT_SUCCESS);
  57 }