io/tst-linkat.c

   1 #include <dirent.h>
   2 #include <fcntl.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6 #include <unistd.h>
   7
   8
   9 static void prepare (void);
  10 #define PREPARE(argc, argv) prepare ()
  11
  12 static int do_test (void);
  13 #define TEST_FUNCTION do_test ()
  14
  15 #include "../test-skeleton.c"
  16
  17 static int dir_fd;
  18
  19 static void
  20 prepare (void)
  21 {
  22   size_t test_dir_len = strlen (test_dir);
  23   static const char dir_name[] = "/tst-linkat.XXXXXX";
  24
  25   size_t dirbuflen = test_dir_len + sizeof (dir_name);
  26   char *dirbuf = malloc (dirbuflen);
  27   if (dirbuf == NULL)
  28     {
  29       puts ("out of memory");
  30       exit (1);
  31     }
  32
  33   snprintf (dirbuf, dirbuflen, "%s%s", test_dir, dir_name);
  34   if (mkdtemp (dirbuf) == NULL)
  35     {
  36       puts ("cannot create temporary directory");
  37       exit (1);
  38     }
  39
  40   add_temp_file (dirbuf);
  41
  42   dir_fd = open (dirbuf, O_RDONLY | O_DIRECTORY);
  43   if (dir_fd == -1)
  44     {
  45       puts ("cannot open directory");
  46       exit (1);
  47     }
  48 }
  49
  50
  51 static int
  52 do_test (void)
  53 {
  54   /* fdopendir takes over the descriptor, make a copy.  */
  55   int dupfd = dup (dir_fd);
  56   if (dupfd == -1)
  57     {
  58       puts ("dup failed");
  59       return 1;
  60     }
  61   if (lseek (dupfd, 0, SEEK_SET) != 0)
  62     {
  63       puts ("1st lseek failed");
  64       return 1;
  65     }
  66
  67   /* The directory should be empty safe the . and .. files.  */
  68   DIR *dir = fdopendir (dupfd);
  69   if (dir == NULL)
  70     {
  71       puts ("fdopendir failed");
  72       return 1;
  73     }
  74   struct dirent64 *d;
  75   while ((d = readdir64 (dir)) != NULL)
  76     if (strcmp (d->d_name, ".") != 0 && strcmp (d->d_name, "..") != 0)
  77       {
  78         printf ("temp directory contains file \"%s\"\n", d->d_name);
  79         return 1;
  80       }
  81   closedir (dir);
  82
  83   /* Try to create a file.  */
  84   int fd = openat (dir_fd, "some-file", O_CREAT|O_RDWR|O_EXCL, 0666);
  85   if (fd == -1)
  86     {
  87       if (errno == ENOSYS)
  88         {
  89           puts ("*at functions not supported");
  90           return 0;
  91         }
  92
  93       puts ("file creation failed");
  94       return 1;
  95     }
  96   write (fd, "hello", 5);
  97   puts ("file created");
  98
  99   struct stat64 st1;
 100   if (fstat64 (fd, &st1) != 0)
 101     {
 102       puts ("fstat64 failed");
 103       return 1;
 104     }
 105
 106   close (fd);
 107
 108   if (linkat (dir_fd, "some-file", dir_fd, "another-file", 0) != 0)
 109     {
 110       puts ("symlinkat failed");
 111       return 1;
 112     }
 113
 114   struct stat64 st2;
 115   if (fstatat64 (dir_fd, "some-file", &st2, 0) != 0)
 116     {
 117       puts ("fstatat64 failed");
 118       return 1;
 119     }
 120   if (st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
 121     {
 122       puts ("file changed after symlinkat");
 123       return 1;
 124     }
 125
 126   if (fstatat64 (dir_fd, "another-file", &st2, AT_SYMLINK_NOFOLLOW) != 0)
 127     {
 128       puts ("2nd fstatat64 failed");
 129       return 1;
 130     }
 131   if (S_ISLNK (st2.st_mode))
 132     {
 133       puts ("2nd fstatat64 shows file is a symlink");
 134       return 1;
 135     }
 136   if (st1.st_dev != st2.st_dev
 137       || st1.st_ino != st2.st_ino
 138       || st1.st_size != st2.st_size)
 139     {
 140       puts ("stat results for linked file do not match");
 141       return 1;
 142     }
 143
 144   if (fstatat64 (dir_fd, "another-file", &st2, 0) != 0)
 145     {
 146       puts ("3rd fstatat64 failed");
 147       return 1;
 148     }
 149   if (st1.st_dev != st2.st_dev
 150       || st1.st_ino != st2.st_ino
 151       || st1.st_size != st2.st_size)
 152     {
 153       puts ("stat results do not match");
 154       return 1;
 155     }
 156
 157   if (unlinkat (dir_fd, "another-file", 0) != 0)
 158     {
 159       puts ("unlinkat failed");
 160       return 1;
 161     }
 162   if (unlinkat (dir_fd, "some-file", 0) != 0)
 163     {
 164       puts ("2nd unlinkat failed");
 165       return 1;
 166     }
 167
 168   close (dir_fd);
 169
 170   return 0;
 171 }